METHOD FOR RECYCLING LIQUID ABSORBENT FOR ACID VAPOR COMPRISING METHYLDIETHANOLAMINE AND LOWER ALKYLPIPERAZIN

摘要

A method for recycling a liquid absorbent for acid vapor, which comprises contacting a mixed gas containing an acid vapor with a liquid absorbent comprising methyldiethanolamine and an alkylpiperazin with a lower alkyl group, thereby rendering the absorbent to absorb the acid vapor, and then separating the acid vapor from the liquid absorbent using a regenerating column operated at 40 DEG C or higher, to thereby regenerate the liquid absorbent.