Process for the neutralization of acid solutions of caprolactam

Details Process for the neutralization of acid solutions of caprolactam Process for the neutralization of acid solutions of caprolactam

1973-12-14

1976-02-10

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

2602393A, C01C 1242

Patent

active

039377890

ABSTRACT:
A process is disclosed in which the heat generated, during neutralization, y ammonium sulfate of a solution of .xi.-caprolactam in sulfuric acid, is used to effect evaporation of water present, and the temperature is kept at about 40.degree.C to 50.degree.C, under subatmospheric pressure, so that substantial hydrolysis of the caprolactam is avoided while a substantial portion of the water present in the neutralization mixture is evaporated at the subatmospheric pressure, and the ammonium sulfate is crystallized substantially free from entrained caprolactam. The caprolactam is then separated from the aqueous phase.

REFERENCES:
patent: 2890935 (1959-06-01), Lloyd
patent: 3117964 (1964-01-01), Nirenberg
patent: 3127395 (1964-03-01), Landau
patent: 3186984 (1965-06-01), Coltow
patent: 3264060 (1966-08-01), Nieswandt

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