Recovery and recycling of chiral tartaric acid resolving agents

Details Recovery and recycling of chiral tartaric acid resolving agents Recovery and recycling of chiral tartaric acid resolving agents

2002-11-08

2010-11-23

Oh, Taylor Victor (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S515000

Reexamination Certificate

active

07838700

ABSTRACT:
A process for the recovery of substituted tartaric acid resolving agents from resolution process liquors comprising organic solvents, wherein the substituted tartaric acid derivatives are neutralised by adding a base, extracted into an aqueous phase and crystallized from the aqueous phase by addition of a mineral acid in the presence of an organic solvent.

REFERENCES:
patent: 1273966 (2000-11-01), None
patent: 09-176115 (1997-08-01), None
patent: 98/01424 (1998-01-01), None
patent: 01/46148 (2001-06-01), None
Database, Chemical Abstract No. 127:121629CA and JP 09 176115.

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