Purification process of polyhydroxycarboxylic acid

Details Purification process of polyhydroxycarboxylic acid Purification process of polyhydroxycarboxylic acid

1995-09-28

1997-04-01

Nazario-Gonzalez, Porfirio

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

Organic compounds

Carboxylic acid esters

528495, 528499, C07C 6748, C07C 6758

Patent

active

056167830

ABSTRACT:
A purification process for polyhydroxycarboxylic acids which comprises dissolving polyhydroxycarboxylic acid in an water-immiscible phenol or an organic solvent containing said water-immiscible phenol, successively bringing the resulting solution into contact with water which contains an acidic material, separating the organic layer from an aqueous layer, and isolating polyhydroxycarboxylic acid from the organic layer. The process can efficiently remove a catalyst contained in the polyhydroxycarboxylic acid prepared in the presence of the catalyst, does not require polyhydroxycarboxylic acid to be in the form of a solid, and can treat polyhydroxycarboxylic acid in a higher concentration as compared with using chlorinated hydrocarbon as a solvent.

REFERENCES:
patent: 4810775 (1989-03-01), Bendix et al.
patent: 4960866 (1990-10-01), Bendix et al.
patent: 5264491 (1993-11-01), Quirk
patent: 5310865 (1994-05-01), Enomoto et al.
patent: 5324798 (1994-06-01), Sanders et al.

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