The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2015
Filed:
Apr. 03, 2013
Akzo Nobel Chemicals International B.v., Amersfoort, NL;
Johannes Jozef Pragt, Dieren, NL;
Mark Theodorus Gerardus Jongmans, Deventer, NL;
Gerrald Bargeman, Wageningen, NL;
Boelo Schuur, Enschede, NL;
Jacobus Theodorus Josef Aaldering, Doesburg, NL;
Melle Rinze Nieuwhof, Dieren, NL;
Anton Alexandru Kiss, Arnhem, NL;
André Banier De Haan, Best, NL;
Alex Londoño Rodriguez, Maastricht, NL;
Cornelis Johannes Govardus Van Strien, Elst, NL;
AKZO NOBEL CHEMICALS INTERNATIONAL B.V., Amersfoort, NL;
Abstract
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.