Akzo Nobel Chemicals International B.v.

Johannes Jozef Pragt

André Banier De Haan

Cornelis Johannes Govardus Van Strien

Gerrald Bargeman

Melle Rinze Nieuwhof

Boelo Schuur

Anton Alexandru Kiss

Jacobus Theodorus Josef Aaldering

Matheus Theodorus De Groot

Mark Theodorus Gerardus Jongmans

Alex Londoño Rodriguez

Maikel Maria Van Iersel

Alex LONDOÑO Rodriguez

The present invention pertains to a process for separating monochloroacetic acid and dichloroacetic acid from one another via extractive distillation using (a) an extractive agent that is chemically stable and has a BFaffinity of between 65 kJ/mole and 110 kJ/mole and (b) an organic solvent that is either an acid with a lowest pKa of between 3.0 and 6.5 or a base with a BFaffinity of between 40 kJ/mole and 75 kJ/mole with the proviso that said BFaffinity is lower than the BFaffinity of the extractive agent, said organic solvent being chemically stable, and having a boiling point at atmospheric pressure of at least 468K, comprising the steps of (i) contacting a mixture comprising monochloroacetic acid and dichloroacetic acid with the extractive agent, (ii) distilling the mixture obtained in step (i) to obtain a monochloroacetic acid stream and a stream comprising dichloroacetic acid and the extractive agent, (iii) subjecting the stream comprising dichloroacetic acid and the extractive agent to a regeneration step, wherein the organic solvent is contacted with the mixture comprising monochloroacetic acid and dichloroacetic acid of step (i), or wherein the organic solvent is contacted with the mixture obtained in step (i) prior to and/or during step (ii), or wherein the organic solvent is contacted with the stream comprising dichloroacetic acid and the extractive agent obtained in step (ii) prior to or during step (iii), or any combination thereof.

Process for separating monochloroacetic acid and dichloroacetic acid via extractive distillation using an organic solvent

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Dieren, Netherlands

Johannes Jozef Pragt