Selective chlorination of glycerol to 3-chloro-1,2-propanediol catalyzed by brØnsted acidic ionic liquids

Abstract Br ønsted acidic ionic liquids composed of 1-butyl-3-methylimidazolium, triethylbutylammonium, and 1-butylpyridinium cation counterparts and HSO4 ‾ and H2PO4 ‾ anion counterparts were used as the catalysts for the selective chlorination of glycerol with hydrogen chloride to 3-chloro-1,2-propandiol. From the perspective of the glycerol conversion and product yields, the catalytic activities of the ionic liquids containing HSO4 ‾ were higher than the ionic liquids containing H2PO4 ‾ . As compared with the carboxylic acid catalysts, Br ønsted acidic ionic liquids favored the catalytic chlorination of glycerol to 3-chloro-1,2-propandiol. When the glycerol chlorination was catalyzed by the Brønsted acidic ionic liquids at 110 ºC for 12 h with the catalyst loading of 0.75 mol·kg ‾ 1 glycerol, the 3-chloro-1,2-propandiol yield was more than 81% at the complete conversion of glycerol.
Source: Brazilian Journal of Chemical Engineering - Category: Chemistry Source Type: research