Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1980-09-17
1982-01-19
Bond, Robert T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07D20112
Patent
active
043116426
ABSTRACT:
This invention is the method to recover caprolactam from a concentrated nylon 6 chip wash water containing water, cyclic oligomer, and caprolactam. The method comprises feeding the concentrated wash water to a wiped-film evaporator operated at a temperature of from about 200.degree. C. to 300.degree. C. and a pressure from about 10 to about 250 Torr, thereby separating the wash water into (a) an overhead stream of water and caprolactam and (b) a bottom stream of caprolactam and cyclic oligomers, then recovering the caprolactam from the overhead stream. The caprolactam in the bottom stream can also be recovered, and the cyclic oligomers depolymerized to caprolactam for recovery.
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Blackman, Jr. Webb B.
Crescentini Lamberto
DeCaprio Joseph D.
Fisher William B.
Lilley, Jr. Roy J.
Allied Corporation
Anderson Richard A.
Bond Robert T.
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