Process for the recovery of citric acid

Details Process for the recovery of citric acid Process for the recovery of citric acid

2004-03-03

2008-08-12

Puttlitz, Karl J (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S590000

Reexamination Certificate

active

07411090

ABSTRACT:
The invention provides a process for the recovery of citric acid from an aqueous solution feed stream originating in fermentation of carbohydrates and utilizing an amine solvent extraction step for separation of impurities comprising: subjecting said aqueous solution feed stream A to a treatment for partial recovery of citric acid, wherein said treatment is other than amine solvent extraction, to form a first portion of purified citric acid B and a secondary feed stream F; subjecting at least a portion G of said secondary feed stream F to a treatment consisting of amine solvent extraction to form a second portion of purified citric acid solution and to reject substantial of impurities initially present in said portion of said secondary feed stream; subjecting said second portion of purified citric acid solution to crystallization; and recycling mother liquor from said crystallization.

REFERENCES:
patent: 5231225 (1993-07-01), Baniel et al.
patent: 5352825 (1994-10-01), Felman et al.
patent: 5426220 (1995-06-01), Baniel et al.
patent: 0 432 610 (1991-06-01), None

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