Method of producing-coarse crystalline nicotinic acid with a hig

Details Method of producing-coarse crystalline nicotinic acid with a hig Method of producing-coarse crystalline nicotinic acid with a hig

1989-02-28

1990-09-25

Rotman, Alan L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546318, C07D21380, C07D213803

Patent

active

049594788

ABSTRACT:
The invention is directed to a method of producing coarse-crystalline nicotinic acid with a high degree of purity in which 3-cyanopyridine is saponified with aqueous alkali hydroxide and the nicotinic acid is allowed to crystallize out of the alkali nicotinate solution obtained in this manner under the addition of mineral acid at temperatures between 99.degree. and 135.degree. C. The pH is kept above 3.7.

REFERENCES:
patent: 4001257 (1977-01-01), Masuda
Chemical Abstracts 65, 5446a (1966), Abstract of Polish Patent 50,077.
J. E. Paustian, Chemtech, Mar. 1981, pp. 174-178.
J. A. Arkhipova et al, Zurnal Prikl, Khim. 35(2), 366-369 (1962).
B. V. Sovorov et al., Zurnal Prikl, Khim. 45, 2716-2718 (1972).
Ullmann, Encyklopadie der technischen Chemie, 4th Ed., vol. 23, p. 709.
Chem. Abst., vol. 65, p. 5446 (1966).

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