Methods for crystallization of hydroxycarboxylic acids

Details Methods for crystallization of hydroxycarboxylic acids Methods for crystallization of hydroxycarboxylic acids

2006-02-23

2008-01-29

Puttlitz, Karl (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S501000, C562S502000

Reexamination Certificate

active

07323592

ABSTRACT:
The invention aims at producing high-purity crystals of a hydroxycarboxylic acid represented by the following formula (1):in high yield.Provided are a method for crystallization of a compound (1) which comprises acidifying a mixture of a solution of an alkali salt of the compound (1) and an organic solvent, and a method for crystallization of compound (1) by mixing a solution of the compound (1) in a water-miscible good solvent with water, in which a slurry with a necessary suspension amount of the compound (1) for inhibiting oil formation and scaling is prepared in advance and then a main crystallization is carried out in the presence of said slurry.

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