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. 24, 2014
Filed:
May. 27, 2010
Hendrikus Wilhelmus Bakkenes, Apeldoorn, NL;
Roberto Aloysius Gerardus Maria Bergevoet, Beek, NL;
Johannes Albertus Maria Meijer, Schalkhaar, NL;
Maria Steensma, Arnhem, NL;
Hendrikus Wilhelmus Bakkenes, Apeldoorn, NL;
Roberto Aloysius Gerardus Maria Bergevoet, Beek, NL;
Johannes Albertus Maria Meijer, Schalkhaar, NL;
Maria Steensma, Arnhem, NL;
Akzo Nobel Chemicals International B.V., Amersfoort, NL;
Abstract
The present invention relates to a process for the preparation of a composition comprising tartaric acid wherein between 55 and 90% by weight of the tartaric acid is meso-tartaric acid, comprising the steps of (i) preparing an aqueous mixture comprising between 35 and 65% by weight of a di-alkali metal salt of L-tartaric acid, a di-alkali metal salt of D-tartaric acid, a mixture of di-alkali metal salts of L-tartaric acid, D-tartaric acid, and optionally meso-tartaric acid, and between 2 and 15% by weight of an alkali metal or alkaline metal hydroxide, and (ii) stirring and heating the aqueous mixture to a temperature of between 100° C. and its boiling point until between 55 and 90% by weight of tartaric acid has been converted to meso-tartaric acid.