A gas-liquid mixing vessel utilizes an axial flow, down-pumping impeller in a draft tube to create vortex development so as to draw gas from the overhead in a body of recirculating liquid. A surge tank is used to accommodate volume changes in the vessel, and a liquid level control feature, in which the...http://www.google.fr/patents/US5004571?utm_source=gb-gplus-shareBrevet US5004571 - Liquid level control in gas-liquid mixing operations
Liquid level control in gas-liquid mixing operations
