Akzo Nobel Chemicals International B.v.

Mark Theodorus Gerardus Jongmans

André Banier De Haan

Gerrald Bargeman

Cornelis Johannes Govardus Van Strien

Melle Rinze Nieuwhof

Boelo Schuur

Jacobus Theodorus Josef Aaldering

Anton Alexandru Kiss

Antoon Jacob Berend Ten Kate

Paul Verwer

Johannes Jozef Pragt

Alex Londoño Rodriguez

Johannes Josef Pragt

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

The present invention pertains to a process for separating monochloroacetic acid and dichloroacetic acid from one another via extractive distillation, comprising the steps of (i) contacting a mixture comprising monochloroacetic acid and dichloroacetic acid with an extractive agent which is chemically stable and which has a BFaffinity of between 65 kJ/mole and 110 kJ/mole, (ii) distilling the mixture to obtain a monochloroacetic acid stream and a stream comprising dichloroacetic acid and the extractive agent, and (iii) regenerating the extractive agent.

Process for separating monochloroacetic acid and dichloroacetic acid via extractive distillation

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Deventer, Netherlands

Mark Theodorus Gerardus Jongmans