Title: Continuous synthesis of 2-acetyl thiophene with C_(25) zeolite molecular sieve
Abstract: With C25 zeolite molecular sieve as catalyst,thiophene and acetic anhydride as raw materials,continuous synthesis of 2-acetyl thiophene was conducted in a trickle bed reactor. The effects of reaction temperature,molar ratio of raw materials,feed flow rate on the Friedel-Crafts acylation reaction were investigated via orthogonal experiment. The optimum reaction condition was:reaction temperature 70℃,molar ratio of thiophene and acetic anhydride 1∶2,feed flow rate 0.05mL/min. Considering the influence of acetic acid on the reaction,the best molar ratio of thiophene,acetic anhydride and acetic acid was 1∶2∶1. Under those conditions,output of 2-acetyl thiophene was 15.10 g per unit mass of catalyst,catalyst service life was 4215 min and initial conversion of thiophene could reach 99.98%. The catalyst was characterized with 13 C NMR MAS,27 Al NMR MAS,and TGA analysis. Bronsted acid sites played an important role in catalysis and the main deactivation type was coking deactivation by compounds with high boiling point.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 1
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