Liquid purification or separation – Processes – Separating
Patent
1991-06-11
1993-06-01
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
203 89, 210758, 210761, 210762, 210763, 210767, 562531, 562602, 562603, B01D 300, B01D 100
Patent
active
052156710
ABSTRACT:
The present invention is directed to a method for recovering 2-chloropropionic acid so that this compound can be separated in a high-purity form. According to the method, crude 2-chloropropionic acid is heat-treated in the presence of a metal compound at a temperature in the range of 130.degree.-180.degree. C. where dichloro derivatives are contained as impurities or at a temperature not exceeding 160.degree. C. where no dichloro derivatives are contained. The metal compound is then removed at 160.degree. C. or lower. Final purification is thereafter conducted to obtain 2-chloropropionic acid as a high-purity product.
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Kajikuri Thutomu
Kitado Shoji
Ono Yuzo
Senoo Kenji
Dawson Robert A.
Kim Sun Uk
Mitsui Toatsu Chemicals Incorporated
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