Process for the preparation of N-methylol-caprolactam

Details Process for the preparation of N-methylol-caprolactam Process for the preparation of N-methylol-caprolactam

1988-01-06

1988-09-06

Bond, Robert T.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

C07D22310

Patent

active

047694548

ABSTRACT:
The process for the preparation of N-methylolcaprolactam through reaction of caprolactam with formaldehyde in the presence of an alkaline catalyst at elevated temperature is essentially improved when the reaction is carried out substantially solvent-free at 70.degree. to 100.degree. C. In an advantageous fashion, the alkaline catalyst used is in heterogeneous form. In a furthermore advantageous fashion, seed crystals of pure N-methylolcaprolactam are added to the reaction batch after cooling to a temperature below the melting point of pure N-methylol-caprolactam.

REFERENCES:
patent: 4185017 (1980-01-01), Piesch et al.
patent: 4620949 (1986-11-01), Lin

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