METHOD FOR PRODUCING CITRIC ACID

1350717 Citric acid MONTECATINI EDISON SpA 18 Sept 1972 [20 Sept 1971] 43109/72 Heading C2C Citric acid is prepared by reacting acetone with carbon dioxide at from 0‹ to 60‹ C. in a dipolar aprotic medium and with at least 4 mols. of a phenate per mol. of acetone, and reacting the resultant 3-keto-g...

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Main Authors BOTTACCIO,GEORGIO,IT, COASSOLO,ALFREDO,IT, CARLETTI,VITTORIO,IT, CHIUSOLI,GIAN P.,IT
Format Patent
LanguageEnglish
Published 31.10.1977
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
FOODS OR FOODSTUFFS
FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J
HUMAN NECESSITIES
METALLURGY
ORGANIC CHEMISTRY
PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT
THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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Summary:1350717 Citric acid MONTECATINI EDISON SpA 18 Sept 1972 [20 Sept 1971] 43109/72 Heading C2C Citric acid is prepared by reacting acetone with carbon dioxide at from 0‹ to 60‹ C. in a dipolar aprotic medium and with at least 4 mols. of a phenate per mol. of acetone, and reacting the resultant 3-keto-glutarate at from 0‹ to 10‹ C. with excess hydrogen cyanide, and hydrolysing the resultant cyanhydrin with excess sulphuric acid. The medium may be dimethylformamide, N-methyl-pyrrolidone or dimethyl sulphoxide. The product which may contain citramalic acid, may be separated by selective precipitation as a salt of calcium, barium or cadmium.
Bibliography:Application Number: CS19720006389