C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/297.3
C07D 213/803 (2006.01) C07D 213/80 (2006.01)
Patent
CA 1294625
ABSTRACT OF THE DISCLOSURE The present invention relates to a process for pro- ducing coarse-crystalline high-purity nicotonic acid. In said process 3-cyano pyridine is saponified with aqueous alkali hydroxide. By adding mineral acid at temperatures of between 99 and 135°C to the alkali-nicotinate solution thus obtained the nicotinic acid is allowed to crystallize out. The pH value does not fall to 3.7 in any case.
535511
Friedrich Heinz
Kuhn Herbert
Moller Alexander
Winkler Kurt
Aktiengesellschaft Degussa
Friedrich Heinz
Kuhn Herbert
Marks & Clerk
Moller Alexander
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