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:
Jun. 16, 2020
Filed:
Dec. 21, 2012
Purac Biochem Bv, Gorinchem, NL;
André Banier De Haan, Best, NL;
Jan Van Krieken, Gorinchem, NL;
Tanja Ðekic {hacek over (Z)}ivkovic, 's-Hertogenbosch, NL;
PURAC BIOCHEM BV, Gorinchem, NL;
Abstract
The invention pertains to method for recovering polycarboxylic acid from an aqueous mixture including the steps of: providing an aqueous mixture including polycarboxylic acid and at least 5 wt. % dissolved halide salt, based on the total weight of water and dissolved material in the aqueous mixture; extracting the polycarboxylic acid from the aqueous mixture into a first organic liquid including an organic solvent selected from the group consisting of ketones and ethers, thereby obtaining an organic polycarboxylic acid solution and an aqueous waste liquid including the halide salt; and extracting the polycarboxylic acid from the organic carboxylic acid solution into an aqueous liquid, thereby obtaining an aqueous polycarboxylic acid solution and a second organic liquid. The method according to the invention allows a combined purification and concentration step for feed solutions of polycarboxylic acids.