Patent ID: 8471074
Filing Date: 2013-06-25
Classification: C07C

Abstract:
1. A process for manufacturing dichloropropanol comprising: (a) in a liquid reaction medium containing water, which is in contact with a gaseous phase, glycerol is reacted with hydrogen chloride under a partial pressure of hydrogen chloride in the gaseous phase greater than 0.2 base absolute to form dichloropropanol; and (b) at least part of the liquid reaction medium and optionally part of the gaseous phase from step a) is (are) subjected to at least one separation operation and, prior to said separation operation, the part of the liquid reaction medium and the part of the gaseous phase from step a) are subjected to: i. at least one treatment for reducing the weight ratio between the hydrogen chloride and the water in the part of the liquid reaction medium so as to attain a ratio less than or equal to the weight ratio between the hydrogen chloride and the water in a binary azeotropic hydrogen chloride/water composition at total pressure of the separation operation; and/or ii. at least one treatment for reducing the weight ratio between the water and the dichloropropanol in the part of the liquid reaction medium so as to attain a ratio less than or equal to the weight ratio between the water and the dichloropropanol in a ternary water/dichloropropanol/hydrogen chloride azeotrope at total pressure of the separation operation.