Recovery of caprolactam from polycaprolactam

Details Recovery of caprolactam from polycaprolactam Recovery of caprolactam from polycaprolactam

C - Chemistry, Metallurgy

07

D

C07D 223/10 (2006.01) C07D 201/12 (2006.01)

Patent

CA 2095678

O.Z. 0050/43205 Abstract of the Disclosure: Caprolactam is recovered from polycaprolactam by hydrolytic cleavage of polycapro- lactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200 to 350°C under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric capro- lactam and oligomers thereof and may contain polycapro- lactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolytic cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.

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