Patent ID: 8449729
Filing Date: 2013-05-28
Classification: B01D,C07B,C07C

Abstract:
1. A method for removing a tertiary chlorinated hydrocarbon impurity from 1,3-dichloro-1-propene, comprising: providing a first mixture comprising 1,3-dichloro-1-propene and a tertiary chlorinated hydrocarbon impurity; contacting the first mixture containing the tertiary chlorinated hydrocarbon impurity with a dehydrochlorination catalyst effective to catalyze a conversion of the tertiary chlorinated hydrocarbon impurity to a corresponding unchlorinated or less-chlorinated unsaturated hydrocarbon and hydrogen chloride to produce a second mixture comprising 1,3-dichloro-1-propane and the corresponding unchlorinated or less-chlorinated unsaturated hydrocarbon; feeding the second mixture into a first distillation separator; recovering from the first distillation separator a purified trans-1,3-dichloro-1-propene fraction, a rough cis fraction, a second lights fraction and a tars fraction; feeding the rough cis fraction into a second distillation separator; and recovering from the second distillation separator a purified cis-1,3-dichloro-1-propene fraction, a third lights fraction and a mid-boiling impurities fraction; wherein the tertiary chlorinated hydrocarbon impurity comprises an impurity selected from the group consisting of 2-chloro-2-methylpentane, 2-chloro-2,3-dimethylbutane, 4-chloro-4-methyl-1-pentene and mixtures thereof.