Chemical process for producing citric acid

Details Chemical process for producing citric acid Chemical process for producing citric acid

1973-03-13

1976-06-08

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5916

Patent

active

039622878

ABSTRACT:
It is disclosed that citric acid or its salts are obtained by the hydrolysis of an alkaline earth metal adduct obtained by reacting a 3-carbamoyl-3-hydroxy-4-halobutyric acid with cyanide ions and with alkaline earth metal hydroxide, preferably in the ratio of from about one to about two gram-atoms of calcium and one gram-mol of cyanide (CN).sup.- per gram-mol of 3-carbamoyl-3-hydroxy-4-halobutyric acid, that 3-carbamoyl-3-hydroxy-4-halobutyric acid is preferably obtained by hydrolysis of a 3-cyano-3-hydroxy-4-halobutyric acid in an acidic system (in the presence of cyanide ions), that 3-cyano-3-hydroxy-4-halobutyric acid is preferably obtained by the hydrocyanation of 3-oxo-4-halobutyric acid with HCN in an aqueous system in the presence of excess cyanide ions and preferably in the presence of alkaline earth metal cyanide or alkali metal cyanide, that 3-oxo-4-halobutyric acid is obtained by hydrolysis of a 3-oxo-4-halobutyryl halide produced from diketene by halogenation. Preferred halogens involved in the process are chlorine and, to a lesser extent, bromine. Preferred alkaline earth metal adducts of the present invention are compounds of calcium. A preferred ratio of gram-atoms of calcium to gram-mols of 3-carbamoyl-3-hydroxy-4-chlorobutyric acid is about 2:1.

REFERENCES:
patent: 3769337 (0000-01-01), Weigand

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