Patent ID: 9505694
Filing Date: 2016-11-29
CPC Classification: C07C

Claim Text:
1. A process for the purification of a substantially water-free liquid feed comprising monochloroacetic acid and dichloroacetic acid to produce a hydrogenation product, which comprises the steps of (a) obtaining the substantially water-free liquid feed from a section of a monochloroacetic acid production plant wherein acetic acid is reacted with chlorine in the presence of a catalyst, (b) stripping the substantially water-free liquid feed using HCl at a pressure between 2 and 10 bar, (c) adding water to the substantially water-free liquid feed so that a second liquid feed is obtained comprising between 0.01 and 5% by weight of water, based on the total weight of the second liquid feed, and (d) subsequently subjecting the second liquid feed to a catalytic hydrodechlorination step by contacting it with a source of hydrogen to convert the dichloroacetic acid into monochloroacetic acid in the presence of a solid heterogeneous hydrogenation catalyst comprising one or more metals of Group VIII of the Periodic Table of the Elements deposited on a carrier, thus producing the hydrogenation product, wherein the hydrogenation product is a monochloroacetic acid-comprising product having a reduced dichloroacetic acid content and a Pt—Co color (as determined according to ISO-6271) that is equal to or below a value of 300.