METHOD FOR PRODUCING CITRIC ACID

• Main Authors: BOTTACCIO,GEORGIO,IT, COASSOLO,ALFREDO,IT, CARLETTI,VITTORIO,IT, CHIUSOLI,GIAN P.,IT
• Format: Patent
• Language: English
• 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

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.