Recovery of caprolactam from oligomers and/or polymers of...

Details Recovery of caprolactam from oligomers and/or polymers of... Recovery of caprolactam from oligomers and/or polymers of...

C - Chemistry, Metallurgy

07

D

C07D 223/10 (2006.01) C07D 201/12 (2006.01) C07D 201/16 (2006.01)

Patent

CA 2143820

Caprolactam is recovered from oligomers and/or polymers of capro- lactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam ob- tained in the cleavage, by a process comprising (a) cleaving oligomers and/or polymers of caprolactam to obtain an aqueous reaction mixture which contains caprolactam, (b) removing water from the reaction mixture obtained under (a) to obtain a residue, (c) distilling the residue obtained under (b) in an acidic medium and (d) then distilling the distillate in an alkaline medium to ob- tain caprolactam, or (c')distilling the residue obtained under (b) in an alkaline me- dium and (d')then distilling the distillate in an acidic medium to obtain caprolactam.

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