Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1995-06-07
2000-10-24
MacMillan, Keith D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5142
Patent
active
061370045
ABSTRACT:
Described are preferred processes for recovering citric acid from a medium in which it is contained. The citric acid is recovered both effectively and in a form which is readily purifiable. In one preferred process, the citric acid-containing medium is contacted with a solid-phase free base resin having tertiary amine groups to adsorb the citric acid. The citric acid is then desorbed by displacement with a stronger acid, and a citric acid-containing fraction is collected substantially free from contamination by the stronger acid. In another preferred process, a citric acid-containing medium is contacted with a solid-phase divinylbenzene-crosslinked polymer having pyridine or aliphatic tertiary amine functions to adsorb citric acid, the contacting being at a temperature below about 40.degree. C. Adsorbed citric acid is then desorbed with hot H.sub.2 O at a temperature of at least about 75.degree. C. Unnecessary impurities such as those arising from the use of organic solvent or throughput inorganic acid desorbents are thereby avoided while at the same time achieving a commercially attractive recovery of the citric acid. Additional preferred modes and process features are also described.
REFERENCES:
patent: 4851573 (1989-07-01), Kulpranthiapanja et al.
Crowe Ernest
Fitzpatrick Gina
Marston Charles
McQuigg Donald W.
Vorhies Susan
MacMillan Keith D.
Reilly Industries Inc.
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