Experimental study on removal of mercaptans from gas streams by 1-butyl-3-methyl-imidazolyl alanine
Fuel Processing Technology(2023)
摘要
Mercaptans as volatile organic sulfur compounds would cause environmental pollution. Researches are focused on the removal of mercaptans by solvent absorption method. In this work, a new efficient absorbent of 1-butyl-3-methylimidazolyl alanine ([Bmim]Ala) was prepared and evaluated by the removal of mercaptans from the model gas containing methyl mercaptan (MeSH, 307.6 mg/m3), ethyl mercaptan (EtSH, 201.1 mg/m3) and propyl mercaptan (PrSH, 149.9 mg/m3) in nitrogen. The results showed that the removal rate of MeSH, EtSH and PrSH was 97.77, 98.12 and 100.00%, respectively, at a temperature of 35 degrees C and a pressure of 1.00 bar for 2 min. After 6 recycling times, [Bmim]Ala remained a good performance for the removal of mercaptans. The desul-furization mechanism was proposed that the absorption sites were mainly on the alanine anion (Ala- ) and Ala -could be replaced by the thiol anion (RS-) to form a new ionic liquid 1-butyl-3-methylimidazolyl thiolate ([Bmim]+RS-). Meanwhile, since the electrostatic interaction between -COO- in Ala- and H-g on the imidazo-lium cation could be destroyed by the-SH group, the -COO- group would interact with mercaptans to form a strong H-bond. The amino in Ala- and the-SH group could form Lewis acid-base compounds.
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关键词
Mercaptans,[Bmim]Ala,Absorption,Removal,Mechanism
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