Recovery of caprolactam from polycaprolactam

Details Recovery of caprolactam from polycaprolactam Recovery of caprolactam from polycaprolactam

1993-04-29

1994-10-25

Bond, Robert T.

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

Organic compounds

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

C07D20112

Patent

active

053590627

ABSTRACT:
Caprolactam is recovered from polycaprolactam by hydrolyric cleavage of polycaprolactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200.degree. to 350.degree. C. under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric caprolactam and oligomers thereof and may contain polycaprolactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolyric cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.

REFERENCES:
patent: 4605762 (1986-08-01), Mandoki
Pat. Abst. of Japan, vol. 6, No. 94 (C-105) Jun. 2, 1982.
Derwent Publ. Ltd., week 8410, AN 78-48679A (english abstract of JP 59 006 849), (no date).
Derwent Publ. Ltd, week 7127, AN 71-46368S (english abstract of JP 46 024 388). (no date).

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