Preparation of L(+)-tartaric acid from calcium tartrate

The process entails the preparation of L(+)-tartaric acid from calcium tartrate by use of sulphuric acid in aqueous medium, characterized by the presence of a chelating agent from the group of N,N'-bis(o-hydroxy-m- sulphonylphenyl)-N,N'-methylenediamine-N-acetic acid or related compounds a...

Full description

Saved in:
Bibliographic Details
Main Authors KOSZEGI MARIA, SZEKELY ISTVAN DR, HAJIMICHAEL JANIS, BOTAR SANDOR DR, DOMNANOVICH THOMAS DR
Format Patent
LanguageEnglish
German
Published 25.01.1995
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
Online AccessGet full text

Cover

More Information
Summary:The process entails the preparation of L(+)-tartaric acid from calcium tartrate by use of sulphuric acid in aqueous medium, characterized by the presence of a chelating agent from the group of N,N'-bis(o-hydroxy-m- sulphonylphenyl)-N,N'-methylenediamine-N-acetic acid or related compounds and/or by addition of water-miscible organic solvents from the group of alcohols, cyclic ethers, ketones or a corresponding mixture of all at temperatures between 0-30 degree C. The calcium sulphate suspension is initially treated with organic solvents, and then sulphuric acid is added and the deposited traces of calcium sulphate are removed, resulting in a clear solution of tartaric acid which can be crystallized. After concentration of the mother liquor to 20-50%, preferably between 35 and 45%, the tartaric acid is separated off and dried, resulting in L(+)- tartaric acid with a purity of more than 95% and with an optical rotation of greater than alpha D20 = 13.9 degree.
Bibliography:Application Number: AT19920002200