Abstract: The mass transfer areas of the fiber liquid film contactor and the sieve plate tower, and the solubility 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 UDS-IV with improved mass transfer area and driving force can increase the remove rate of organic sulfur from LPG in a fiber liquid film contactor. The removal rate of total organosulfur of UDS-IV solvent is approximately 46 % 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 contents of H2S and total sulfur of the LPG to less than 1 and 240 mg?m-3, respectively, and the removal efficiency for total organosulfur is above 93%. Key Words: liquefied petroleum gas; desulfurization solvent; organosulfur; methyl mercaptan; carbonyl sulfide; fiber liquid film contactor

Key words: liquiefied petroleum gas, desulfurization solvent, organosulfur, methyl mercaptan, carbonyl sulfide, fiber film contactor