Method for the purification of a-hydroxy acids on an...

Details Method for the purification of a-hydroxy acids on an... Method for the purification of a-hydroxy acids on an...

2007-05-29

2007-05-29

Oh, Taylor Victor (Department: 1625)

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

Organic compounds

Carboxylic acids and salts thereof

C562S589000

Reexamination Certificate

active

10380706

ABSTRACT:
The present invention relates to a method for the purification of an α-hydroxy acid on an industrial scale, in which an α-hydroxy acid with a color (fresh) of not more than 10,000 APHA units is subjected to (a) a crystallization step followed by (b) a distillation step.

REFERENCES:
patent: 5510526 (1996-04-01), Baniel et al.
patent: 5859296 (1999-01-01), Neuamann et al.
patent: 593657 (1934-02-01), None
patent: WO 92/05138 (1992-04-01), None
patent: WO 00/56693 (2000-09-01), None
patent: WO 02/22544 (2001-09-01), None
L. B. Lockwood, et al., “Lactic Acid”, Chemistry and Enzymology of Lactate Isomers, Jul. 31, 1965, pp. 654-657.
W.G. Kerckhoff, “The preparation of Crystalline Lactic Acid”, Jun. 7, 1933, pp. 449-460.

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