Method for the purification of an alpha-hydroxy acid on an...

Details Method for the purification of an alpha-hydroxy acid on an... Method for the purification of an alpha-hydroxy acid on an...

2006-02-21

2006-02-21

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

07002039

ABSTRACT:
The invention relates to a method for the purification of a fermentatively prepared 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 at least two crystallization steps, with the crystallization steps being carried out in cooling crystallization devices, melting crystallization devices, evaporative crystallization devices and/or adiabatic crystallization devices.

REFERENCES:
patent: 5510526 (1996-04-01), Baniel et al.
patent: 2002/0102672 (2002-08-01), Mizrahi et al.
patent: 593657 (1934-02-01), None
patent: 0646399 (1993-09-01), None
patent: 0733 616 (1996-09-01), None
patent: WO 92/05138 (1992-04-01), None
W.G. Kerckhoff, “The preparation of Crystalline Lactic Acid”, Jun. 7, 1933, pp. 449-460.

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