Method for gas separation by phase enhanced gas-liquid absorption

Abstract

A new method called phase enhanced gas-liquid absorption has been developed. By addition of organic phase into the absorption system of gas aqueous phase, the absorption rate was increased significantly. Absorption rate was enhanced by organic phase. This invention provides a new technology for improving the efficiency of traditional gas absorption. By reducing mass transfer resistance in absorption process, this technology is able to lead to a more efficient, low cost absorption process and significantly reduce constraints and costs.

1 . A method for gas separation by phase enhanced gas-liquid absorption comprising three phase: gas phase, organic phase and aqueous phase, wherein said organic phase is added into gas-aqueous phase absorption system and resulted in an increase of absorption rate, and said organic phase is played the role of transportation of gas solute from gas phase to aqueous phase.  
     
     
         2 . The method of  claim 1 , wherein said gas phase are CO 2 , SO 2 , H 2 S or its mixture.  
     
     
         3 . The method of  claim 1 , wherein said organic phase are alkane, alcohol, ether, ester, amine or organic compounds forming two phases with aqueous phase or their mixture.  
     
     
         4 . The method of clam  1 , wherein the ratios of said organic phase to said aqueous phase are 1 to 1-1000 by volume.  
     
     
         5 . The method of  claim 1 , wherein the gas solute content in said gas phase is about 0.001% to about 100%.  
     
     
         6 . The method of  claim 1 , wherein said gas separation is carried out at temperature from about 1° C. to about 500° C.  
     
     
         7 . The method of  claim 1 , wherein said gas separation is carried out under a pressure from about 10 −6  atm to about 10 6  atm.  
     
     
         8 . The method of  claim 1 , wherein said aqueous phase include all types of aqueous solution.  
     
     
         9 . Invented method can be applied to the separation and purification of carbon dioxide from gas mixture. However, it is not limited to carbon dioxide absorption process. The invented method also can be applied to other gas absorption processes, such as SO 2 , H 2 S etc.