Reilly Industries, Inc.

Ernest Crowe

Donald W McQuigg

Charles R Marston

Susan L Vorhies

Gina Fitzpatrick

Ramiah Murugan

Eric F Scriven

Martin P Grendze

James G Keay

Eric F V Scriven

Thomas D Bailey

John T Wyeth

Katherine M Weisheit

Described are non-swelling, crosslinked, bead forms of ampholytic base polymers that can be utilized in the chromatographic-type separation of acids from other compounds. Preferred polymers are prepared by modifying a poly-2 or poly-4-vinylpyridine resin crosslinked with divinylbenzene.

Crosslinked, non-swellable ampholytic base resins

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.

Processes for recovering citric acid

Described is a process for recovering phytic acid or phytic acid salt from a medium in which it is contained. This process includes contacting the medium with a solid-phase free base polymer having tertiary amine functions to adsorb the phytic acid or salt thereof. In one preferred mode, the medium to be treated also contains lactic acid, and separate fractions predominant in (i) lactic acid and (ii) phytic acid or phytic acid salt, respectively, are recovered. Also described are preferred processes for treating mediums to recover lactic acid therefrom, and a favored process for obtaining inositol directly by hydrolyzing phytic acid or phytic acid salt while adsorbed on a pyridine-containing polymer.

Process for recovering phytic acid, lactic acid or inositol

Described are unique polymerization processes for preparing linear polyvinylpyridine polymers as well as unique linear polyvinylpyridine polymer compositions. The processes involve the use of an alkylpyridine anion as an anionic polymerization catalyst and result in linear polyvinylpyridines having alkylpyridine end groups homologous to the pendant pyridines of the polymer. Processes of the invention are particularly advantageous in preparing relatively low molecular weight linear polyvinylpyridines without the need to use large amounts of catalyst to achieve the same.

Linear polyvinylpyridine polymers and processes

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Beech Grove, IN, United States of America

Ernest Crowe