CA2426253A1 - Rubber reduction - Google Patents
Rubber reduction Download PDFInfo
- Publication number
- CA2426253A1 CA2426253A1 CA 2426253 CA2426253A CA2426253A1 CA 2426253 A1 CA2426253 A1 CA 2426253A1 CA 2426253 CA2426253 CA 2426253 CA 2426253 A CA2426253 A CA 2426253A CA 2426253 A1 CA2426253 A1 CA 2426253A1
- Authority
- CA
- Canada
- Prior art keywords
- rubber
- temperature
- solvent
- reactor
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 39
- 230000009467 reduction Effects 0.000 title description 7
- 238000000034 method Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 42
- 239000002904 solvent Substances 0.000 claims abstract description 22
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 11
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 5
- 230000003028 elevating effect Effects 0.000 claims abstract 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 25
- 150000002430 hydrocarbons Chemical class 0.000 claims description 25
- 239000004215 Carbon black (E152) Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000006229 carbon black Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 6
- 238000011946 reduction process Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/14—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
- C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2321/00—Characterised by the use of unspecified rubbers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
A process for reducing rubber is provided. The process includes the steps of providing the rubber to a reactor, providing a solvent to the reactor, elevating a temperature within the reactor to a temperature wherein the temperature is below a critical temperature of the solvent, elevating a pressure within the reactor to a pressure of at least the saturated vapour pressure of the solvent at the temperature, reducing the rubber for a specified time and producing a reaction product.
Description
lgubber Reduction Field of the Invention S The invention generally relates to rubber reduction, and more particularly to tire reduction using a solvent at a subcritical temperature.
Background of the Invention It is estimated that in many countries the number of used tires produced per year is approximately equal to the population of the country. As an example there are more than 250 million used tires produced annually in the United States. Methods of dealing with these used tires can generally be placed in two categories i.e. disposal and reclamation. The former group includes land filling and stock pilling which are increasingly unacceptable options for a multitude of reasons. Within the latter group are approaches that use the tires in close to their original state with possibly some physical processing. Examples within this group include vibration and debris dampening mats as may be used drilling operations or filler material for road construction. Most of the applications in this category represent a limited volume of tires and do not exploit the economic value of the material within the tire.
A second group of reclamation methods look to extracting value from the constituent materials within a tire. Major constituents include synthetic and natural rubber, carbon black and steel. Minor constituents include sulphur that is used for cross-linking of the rubber chains during the vulcanization process. The most basic reclamation alternative is the use of tires as a fuel. In this case the tire may be in its original unprocessed state or it may have been reduced to simpler hydrocarbons such as oils. This latter alternative is favourable as constituents that axe not desirable during burning would generally be removed. However, the use of tires as a fuel again reduces the value of the reclaimed material to a point where there is little or no retention of value added during the fabrication of the tire.
Therefore, there is a need for a method and system that provides for the reclamation of tires while maintaining value added to the constituent materials during the original processing of the tire.
° 2 Summary of the Invention The invention is directed to a method and system for the reduction of tires.
An object of the invention is to provide a system and method for the reduction of tires to hydrocarbons where at least a portion of these hydrocarbons have a molecular weight that is larger than oils.
Other aspects and advantages of the invention, as well as the structure and operation of various embodiments of the invention, will become apparent to those ordinarily skilled in the art upon review of the following description of the invention in conjunction with the accompanying drawings.
Brief Description of the Drawings The invention will be described with reference to the accompanying drawings, wherein:
Fig. la is a schematic graph illustrating % completion v. time for a pyrolisis reduction process;
Fig. lb is a schematic graph illustrating % completion v. time for a non-pyrolisis reduction process;
Fig. 2 is a flow chart of a process for reducing tires according to an embodiment of the invention;
Fig. 3 is a flow chart of a process for reducing tires according to another embodiment of the invention; and Fig. 4 is a flow chart of a process for reducing tires according to a further embodiment of the invention.
Like numerals identify like features within the drawings.
Detailed Description of the Invention _ . . ;<_ .. .__:; .r._ :_---- ~ .r.:. .,.y__n _,_m E..m_ . __._.___._ _._ The reduction of tires can generally be considered to include two steps or processes. The first of these is devulcanization where cross-linking sulphur bonds between rubber molecules are broken. At the end of the devulcanization process the mass of solid residue is approximately 100% of the original mass of tire. Th.e solid residue contains rubber hydrocarbon and carbon black where rubber hydrocarbon includes any hydrocarbon originating from the initial rubber. The rubber hydrocarbon has an average molecular weight that is generally less than the initial rubber and greater than oil, where oil has an average molecular weight of approximately 500 or less. The depolymerization process reduces the average molecular weight of the rubber hydrocarbon until, at completion, the rubber hydrocarbon is substantially oil.
The mass of solid residue is approximately 40% of the initial mass of tire at the end of the depolymerization process. At this point the solid residue is substantially only carbon black.
1 S Figure 1 a is schematic graph of the % completion v. time for a normal pyrolisis process. In a normal pyrolisis process a devulcanization process102 and a depolymerization process 104 occur substantially in parallel. As such the two processes are complete at approximately the same time i.e. tV~tp. Figure lb shows a non-pyrolisis process in which the devulcanization process 106 is separated from the depolymerization process 108. At time t~ the devulcanization process 106 is complete while the depolymerization process 108 is only a fraction of the way to completion.
The process of reducing tires according to an embodiment of the invention allows for at least some separation of the devulcanization and a depolymerization processes. A
flow chart of a reduction process according to an embodiment of the instant invention is presented in Figure 2. Tire feedstock is provided to a reactor suitable for temperatures and pressures appropriate for subcritical treatment with water at step 202.
Water is provided to the reactor at step 204. The amount of water provided is sufficient to maintain the saturated water vapour pressure at the reaction temperature and to allow the tire feedstock to be immersed in the liquid water at the reaction temperature.
The reactor is heated to the reaction temperature at step 206. To maintain a subcritical reaction the reaction temperature is less than the critical temperature of water.
The reaction pressure is provided at step 208. This pressure is greater than or equal to the saturated water vapour pressure at the reaction temperature. In the current embodiment the reaction temperature is between about 280~aC and about 350°C and the reaction _ . T ~:.: . .- «.__ ._ " . " . - .. . _ ..__ ._ .._ ____ ~..;.,, rr,.~. _ pressure is between about 950 psig and about 2400 psig. The reaction is continued at step 210 for time t. In the current embodiment time t is less than about 1 hr.
A reaction product is produced at step 212. The reaction product produced according to the process of the current embodiment includes devulcanized rubber hydrocarbon, carbon black and may include some oils resulting from at Least partial depolymerization of the rubber hydrocarbon.
A flow chart of a reduction process according to another embodiment of the invention is presented in Figure 3. The pracess includes the steps presented in Figure 2.
The process according to this embodiment of this invention. further includes the step of treating the reaction product with a solvent at step 302. In this embodiment the solvent is one appropriate for the dissolution of rubber hydrocarbon, including toluene and cyclohexane. The use of other solvents and mixtures of solvents as appropriate for the dissolution of the reaction product, which may include hydrocarbons of varying molecular weight will be apparent to one skilled in the art. Carbon black is then separated from the reaction product at step 304 using filtration methods. It will be apparent to one skilled in the art that any appropriate techniques may be implemented for the separation of the carbon black form the dissolved reaction product.
A flow chart of a reduction process according to a further embodiment of the invention is presented in Figure 4. The process includes the steps presented in Figure 3.
The process according to this embodiment of this invention further includes the step of separating the solvent from the rubber hydrocarbon. Techniques appropriate for separating the solvent from the rubber hydrocarbon will be apparent to one skilled in the art. In this embodiment evaporation is used to separate the solvent from the rubber hydrocarbon.
Process parameters for subcritical fluid techniques include pressure, temperature, fluid or solvent and time. Without being bound by theory it appears that operation of the process at temperatures below the critical temperature of the solvent allows for the separation of the devulcanization and the depolymerization processes. The rate of depolymerization process is lowered to an extent where it is effectively separated from the step of devulcanization. This allows unproved control regarding the extent to which depolymerization is allowed to proceed. In an embodiment of the invention the reaction time is varied to provide substantially complete devulcanization and a desired amount of depolyrnerization.
_, ~ , _ . T ,. -: -; . -,. .. ,. . , .. . ...
It will be apparent to one skilled in the art that tires can include any vulcanized rubber tire as may be used for transportation purposes. It will also be apparent to one of skill in the art that other vulcanized rubber, synthetic and natural, products may be used 5 as a feedstock.
It will be further apparent to one of skill in the art that the processing conditions presented above are with respect to one embodiment of the invention. The invention encompasses those processing parameters i.e. temperature, pressure, time and solvent that allow for the separation of the devulcanization and depolymerization steps within the reduction process.
While the invention has been described according to what is presently considered to be the most practical and prefeaTed embodiments, it must be understood that the invention is not limited to the disclosed embodiments. Those ordinarily skilled in the art will understand that various modifications and equivalent structures and functions may be made without departing from the spirit and scope of the invention as defined in the claims. Therefore, the invention as defined in the claims must be accorded the broadest possible interpretation so as to encompass all such modifications and equivalent structures and functions.
Background of the Invention It is estimated that in many countries the number of used tires produced per year is approximately equal to the population of the country. As an example there are more than 250 million used tires produced annually in the United States. Methods of dealing with these used tires can generally be placed in two categories i.e. disposal and reclamation. The former group includes land filling and stock pilling which are increasingly unacceptable options for a multitude of reasons. Within the latter group are approaches that use the tires in close to their original state with possibly some physical processing. Examples within this group include vibration and debris dampening mats as may be used drilling operations or filler material for road construction. Most of the applications in this category represent a limited volume of tires and do not exploit the economic value of the material within the tire.
A second group of reclamation methods look to extracting value from the constituent materials within a tire. Major constituents include synthetic and natural rubber, carbon black and steel. Minor constituents include sulphur that is used for cross-linking of the rubber chains during the vulcanization process. The most basic reclamation alternative is the use of tires as a fuel. In this case the tire may be in its original unprocessed state or it may have been reduced to simpler hydrocarbons such as oils. This latter alternative is favourable as constituents that axe not desirable during burning would generally be removed. However, the use of tires as a fuel again reduces the value of the reclaimed material to a point where there is little or no retention of value added during the fabrication of the tire.
Therefore, there is a need for a method and system that provides for the reclamation of tires while maintaining value added to the constituent materials during the original processing of the tire.
° 2 Summary of the Invention The invention is directed to a method and system for the reduction of tires.
An object of the invention is to provide a system and method for the reduction of tires to hydrocarbons where at least a portion of these hydrocarbons have a molecular weight that is larger than oils.
Other aspects and advantages of the invention, as well as the structure and operation of various embodiments of the invention, will become apparent to those ordinarily skilled in the art upon review of the following description of the invention in conjunction with the accompanying drawings.
Brief Description of the Drawings The invention will be described with reference to the accompanying drawings, wherein:
Fig. la is a schematic graph illustrating % completion v. time for a pyrolisis reduction process;
Fig. lb is a schematic graph illustrating % completion v. time for a non-pyrolisis reduction process;
Fig. 2 is a flow chart of a process for reducing tires according to an embodiment of the invention;
Fig. 3 is a flow chart of a process for reducing tires according to another embodiment of the invention; and Fig. 4 is a flow chart of a process for reducing tires according to a further embodiment of the invention.
Like numerals identify like features within the drawings.
Detailed Description of the Invention _ . . ;<_ .. .__:; .r._ :_---- ~ .r.:. .,.y__n _,_m E..m_ . __._.___._ _._ The reduction of tires can generally be considered to include two steps or processes. The first of these is devulcanization where cross-linking sulphur bonds between rubber molecules are broken. At the end of the devulcanization process the mass of solid residue is approximately 100% of the original mass of tire. Th.e solid residue contains rubber hydrocarbon and carbon black where rubber hydrocarbon includes any hydrocarbon originating from the initial rubber. The rubber hydrocarbon has an average molecular weight that is generally less than the initial rubber and greater than oil, where oil has an average molecular weight of approximately 500 or less. The depolymerization process reduces the average molecular weight of the rubber hydrocarbon until, at completion, the rubber hydrocarbon is substantially oil.
The mass of solid residue is approximately 40% of the initial mass of tire at the end of the depolymerization process. At this point the solid residue is substantially only carbon black.
1 S Figure 1 a is schematic graph of the % completion v. time for a normal pyrolisis process. In a normal pyrolisis process a devulcanization process102 and a depolymerization process 104 occur substantially in parallel. As such the two processes are complete at approximately the same time i.e. tV~tp. Figure lb shows a non-pyrolisis process in which the devulcanization process 106 is separated from the depolymerization process 108. At time t~ the devulcanization process 106 is complete while the depolymerization process 108 is only a fraction of the way to completion.
The process of reducing tires according to an embodiment of the invention allows for at least some separation of the devulcanization and a depolymerization processes. A
flow chart of a reduction process according to an embodiment of the instant invention is presented in Figure 2. Tire feedstock is provided to a reactor suitable for temperatures and pressures appropriate for subcritical treatment with water at step 202.
Water is provided to the reactor at step 204. The amount of water provided is sufficient to maintain the saturated water vapour pressure at the reaction temperature and to allow the tire feedstock to be immersed in the liquid water at the reaction temperature.
The reactor is heated to the reaction temperature at step 206. To maintain a subcritical reaction the reaction temperature is less than the critical temperature of water.
The reaction pressure is provided at step 208. This pressure is greater than or equal to the saturated water vapour pressure at the reaction temperature. In the current embodiment the reaction temperature is between about 280~aC and about 350°C and the reaction _ . T ~:.: . .- «.__ ._ " . " . - .. . _ ..__ ._ .._ ____ ~..;.,, rr,.~. _ pressure is between about 950 psig and about 2400 psig. The reaction is continued at step 210 for time t. In the current embodiment time t is less than about 1 hr.
A reaction product is produced at step 212. The reaction product produced according to the process of the current embodiment includes devulcanized rubber hydrocarbon, carbon black and may include some oils resulting from at Least partial depolymerization of the rubber hydrocarbon.
A flow chart of a reduction process according to another embodiment of the invention is presented in Figure 3. The pracess includes the steps presented in Figure 2.
The process according to this embodiment of this invention. further includes the step of treating the reaction product with a solvent at step 302. In this embodiment the solvent is one appropriate for the dissolution of rubber hydrocarbon, including toluene and cyclohexane. The use of other solvents and mixtures of solvents as appropriate for the dissolution of the reaction product, which may include hydrocarbons of varying molecular weight will be apparent to one skilled in the art. Carbon black is then separated from the reaction product at step 304 using filtration methods. It will be apparent to one skilled in the art that any appropriate techniques may be implemented for the separation of the carbon black form the dissolved reaction product.
A flow chart of a reduction process according to a further embodiment of the invention is presented in Figure 4. The process includes the steps presented in Figure 3.
The process according to this embodiment of this invention further includes the step of separating the solvent from the rubber hydrocarbon. Techniques appropriate for separating the solvent from the rubber hydrocarbon will be apparent to one skilled in the art. In this embodiment evaporation is used to separate the solvent from the rubber hydrocarbon.
Process parameters for subcritical fluid techniques include pressure, temperature, fluid or solvent and time. Without being bound by theory it appears that operation of the process at temperatures below the critical temperature of the solvent allows for the separation of the devulcanization and the depolymerization processes. The rate of depolymerization process is lowered to an extent where it is effectively separated from the step of devulcanization. This allows unproved control regarding the extent to which depolymerization is allowed to proceed. In an embodiment of the invention the reaction time is varied to provide substantially complete devulcanization and a desired amount of depolyrnerization.
_, ~ , _ . T ,. -: -; . -,. .. ,. . , .. . ...
It will be apparent to one skilled in the art that tires can include any vulcanized rubber tire as may be used for transportation purposes. It will also be apparent to one of skill in the art that other vulcanized rubber, synthetic and natural, products may be used 5 as a feedstock.
It will be further apparent to one of skill in the art that the processing conditions presented above are with respect to one embodiment of the invention. The invention encompasses those processing parameters i.e. temperature, pressure, time and solvent that allow for the separation of the devulcanization and depolymerization steps within the reduction process.
While the invention has been described according to what is presently considered to be the most practical and prefeaTed embodiments, it must be understood that the invention is not limited to the disclosed embodiments. Those ordinarily skilled in the art will understand that various modifications and equivalent structures and functions may be made without departing from the spirit and scope of the invention as defined in the claims. Therefore, the invention as defined in the claims must be accorded the broadest possible interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (12)
1. A process for reducing rubber, the process comprising the steps:
providing the rubber to a reactor;
providing a solvent to the reactor;
elevating a temperature within the reactor to a temperature wherein the temperature is below a critical temperature of the solvent;
elevating a pressure within the reactor to a pressure of at least the saturated vapour pressure of the solvent at the temperature;
reducing the rubber for a specified time; and producing a reaction product.
providing the rubber to a reactor;
providing a solvent to the reactor;
elevating a temperature within the reactor to a temperature wherein the temperature is below a critical temperature of the solvent;
elevating a pressure within the reactor to a pressure of at least the saturated vapour pressure of the solvent at the temperature;
reducing the rubber for a specified time; and producing a reaction product.
2. A process as claimed in claim 1 wherein the step of reducing the rubber comprises the steps of:
devulcanizing the rubber to produce rubber hydrocarbon;
depolymerising the rubber hydrocarbon to produce hydrocarbons with a lower molecular weight than a molecular weight of the rubber hydrocarbon.
devulcanizing the rubber to produce rubber hydrocarbon;
depolymerising the rubber hydrocarbon to produce hydrocarbons with a lower molecular weight than a molecular weight of the rubber hydrocarbon.
3. A process for reducing rubber, the process comprising the steps of:
providing rubber to a reactor;
providing a solvent to the reactor;
elevating a temperature within the reactor to a temperature wherein the temperature is below a critical temperature of the solvent;
elevating a pressure within the reactor to a pressure equal to the saturated vapour pressure of the solvent at the temperature;
reducing the rubber for a specified time; and producing a reaction product.
providing rubber to a reactor;
providing a solvent to the reactor;
elevating a temperature within the reactor to a temperature wherein the temperature is below a critical temperature of the solvent;
elevating a pressure within the reactor to a pressure equal to the saturated vapour pressure of the solvent at the temperature;
reducing the rubber for a specified time; and producing a reaction product.
4. A process as claimed in claim 3 wherein the step of reducing the rubber comprises the steps of:
devulcanizing the rubber to produce rubber hydrocarbon;
depolymerising the rubber hydrocarbon to produce hydrocarbons with a lower molecular weight than a molecular weight of the rubber hydrocarbon.
devulcanizing the rubber to produce rubber hydrocarbon;
depolymerising the rubber hydrocarbon to produce hydrocarbons with a lower molecular weight than a molecular weight of the rubber hydrocarbon.
5. A process as claimed in any of claims 1 to 4 wherein the rubber is tire.
6. A process as claimed in any of claims 1 to 5 wherein the solvent is water.
7. A process as claimed in claim 5 wherein the temperature is between about 280°C and about 350°C.
8. A process as claimed in claim 6 wherein the pressure is between about 950 psig and about 2400 psig.
9. A process according to any of claims 1 to 8 wherein the specified time is less than about one hour.
10. A process according to any of claims 1 to 9 wherein the rubber is within the liquid solvent during the reaction.
11. A process according to any of claims 1to 10 wherein the reaction product comprises rubber hydrocarbon and carbon black.
12. A process according to any of claims 1to 11 wherein the reaction product comprises substantially no sulfur.
Priority Applications (16)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2426253 CA2426253A1 (en) | 2003-04-22 | 2003-04-22 | Rubber reduction |
| ES03747773T ES2367017T3 (en) | 2003-04-22 | 2003-09-18 | RUBBER REDUCTION. |
| BR0318265A BR0318265B1 (en) | 2003-04-22 | 2003-09-18 | Method for reducing vulcanized rubber, superficially devulcanized rubber, completely devulcanized rubber, Method for reducing vulcanized tire, rubber hydrocarbon and carbon black. |
| AT03747773T ATE514737T1 (en) | 2003-04-22 | 2003-09-18 | REDUCTION OF RUBBER |
| PCT/CA2003/001421 WO2004094513A1 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| CA 2441713 CA2441713C (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| JP2004571016A JP4708033B2 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| DK03747773T DK1618140T3 (en) | 2003-04-22 | 2003-09-18 | Reduction of rubber |
| US10/666,976 US7166658B2 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| SI200332013T SI1618140T1 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| AU2003266892A AU2003266892B2 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| CNB038264951A CN100375758C (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| MXPA05011337A MXPA05011337A (en) | 2003-04-22 | 2003-09-18 | Rubber reduction. |
| PT03747773T PT1618140E (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| EP20030747773 EP1618140B1 (en) | 2003-04-22 | 2003-09-18 | Rubber reduction |
| CY20111100745T CY1111794T1 (en) | 2003-04-22 | 2011-08-02 | CONVERSION KOUTSUK |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2426253 CA2426253A1 (en) | 2003-04-22 | 2003-04-22 | Rubber reduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2426253A1 true CA2426253A1 (en) | 2004-10-22 |
Family
ID=33163782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2426253 Abandoned CA2426253A1 (en) | 2003-04-22 | 2003-04-22 | Rubber reduction |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US7166658B2 (en) |
| EP (1) | EP1618140B1 (en) |
| JP (1) | JP4708033B2 (en) |
| CN (1) | CN100375758C (en) |
| AT (1) | ATE514737T1 (en) |
| AU (1) | AU2003266892B2 (en) |
| BR (1) | BR0318265B1 (en) |
| CA (1) | CA2426253A1 (en) |
| CY (1) | CY1111794T1 (en) |
| DK (1) | DK1618140T3 (en) |
| ES (1) | ES2367017T3 (en) |
| MX (1) | MXPA05011337A (en) |
| PT (1) | PT1618140E (en) |
| SI (1) | SI1618140T1 (en) |
| WO (1) | WO2004094513A1 (en) |
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| WO2010048714A1 (en) * | 2008-10-31 | 2010-05-06 | Harrison Brian H | Separating devulcanized rubber |
| CN104924488A (en) * | 2015-03-28 | 2015-09-23 | 安徽微威胶件集团有限公司 | Manufacturing technology of engine rubber pad |
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| IN2012DN03077A (en) | 2009-10-14 | 2015-07-31 | Reklaim Inc | |
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| WO2014082172A1 (en) | 2012-11-27 | 2014-06-05 | Harrison Brian H | Vulcanized rubber conversion |
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| CN110591149A (en) * | 2019-09-05 | 2019-12-20 | 江苏睿博环保设备有限公司 | Method for desulfurizing vulcanized rubber powder by only using water as auxiliary agent |
| CN112917740A (en) * | 2021-01-28 | 2021-06-08 | 张春瑞 | Waste rubber retrieves with soft processing apparatus of thermally equivalent |
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- 2003-09-18 AT AT03747773T patent/ATE514737T1/en active
- 2003-09-18 US US10/666,976 patent/US7166658B2/en active Active
- 2003-09-18 SI SI200332013T patent/SI1618140T1/en unknown
- 2003-09-18 MX MXPA05011337A patent/MXPA05011337A/en active IP Right Grant
- 2003-09-18 DK DK03747773T patent/DK1618140T3/en active
- 2003-09-18 JP JP2004571016A patent/JP4708033B2/en not_active Expired - Fee Related
- 2003-09-18 CN CNB038264951A patent/CN100375758C/en not_active Expired - Fee Related
- 2003-09-18 ES ES03747773T patent/ES2367017T3/en not_active Expired - Lifetime
- 2003-09-18 BR BR0318265A patent/BR0318265B1/en not_active IP Right Cessation
- 2003-09-18 PT PT03747773T patent/PT1618140E/en unknown
- 2003-09-18 EP EP20030747773 patent/EP1618140B1/en not_active Expired - Lifetime
- 2003-09-18 AU AU2003266892A patent/AU2003266892B2/en not_active Ceased
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010048714A1 (en) * | 2008-10-31 | 2010-05-06 | Harrison Brian H | Separating devulcanized rubber |
| US8415402B2 (en) | 2008-10-31 | 2013-04-09 | Rubreco Inc. | Separating devulcanized rubber |
| CN104924488A (en) * | 2015-03-28 | 2015-09-23 | 安徽微威胶件集团有限公司 | Manufacturing technology of engine rubber pad |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004094513A1 (en) | 2004-11-04 |
| ES2367017T3 (en) | 2011-10-27 |
| PT1618140E (en) | 2011-08-01 |
| DK1618140T3 (en) | 2011-07-25 |
| EP1618140B1 (en) | 2011-06-29 |
| US20040214906A1 (en) | 2004-10-28 |
| SI1618140T1 (en) | 2011-10-28 |
| JP2006524266A (en) | 2006-10-26 |
| AU2003266892B2 (en) | 2010-06-03 |
| BR0318265A (en) | 2006-05-23 |
| CN1771286A (en) | 2006-05-10 |
| CY1111794T1 (en) | 2015-10-07 |
| EP1618140A1 (en) | 2006-01-25 |
| AU2003266892A1 (en) | 2004-11-19 |
| US7166658B2 (en) | 2007-01-23 |
| BR0318265B1 (en) | 2013-05-14 |
| ATE514737T1 (en) | 2011-07-15 |
| CN100375758C (en) | 2008-03-19 |
| MXPA05011337A (en) | 2006-03-08 |
| JP4708033B2 (en) | 2011-06-22 |
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