FORMULATED SOLVENT FOR ORGANOSULFURS REMOVAL FROM LPG IN FIBER FILM CONTACTOR
The mass transfer areas of the fiber film contactor and the sieve plate tower,and the sol-ubility for organosulfurs of N-methyldiethanolamine (MDEA )and formulated solvents (UDS-Ⅰ, UDS-Ⅱ,UDS-Ⅲ,UDS-Ⅳ)were compared. In addition,the influence of operation conditions on the desulfurization performance of the preferred formulated solvent UDS-Ⅳ was investigated. The results indicate that the process combining UDS-Ⅳ and a fiber film contactor can increase the removal rate for organic sulfurs from LPG with improved mass transfer area and driving force. The removal rate for total organosulfur of UDS-Ⅳ solvent is 45.7 percentage points higher than that of MDEA. Meanwhile,the distribution ratios of organosulfurs in UDS-Ⅳ solvent-LPG system are found 7—10 times as much as those in MDEA-LPG system. Under optimum operation conditions,UDS-Ⅳ solvent can reduce the con-tents of H2 S and total sulfur of the LPG to less than 1 and 240 mg/m3 ,respectively,and the removal ef-ficiency for total organosulfur is above 93%.
liquefied petroleum gasdesulfurization solventorganosulfurmethyl mercaptancar-bonyl sulfidefiber film contactor