The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 1996
Filed:
Jun. 02, 1994
Applicant:
Inventors:
Antoon H Halderit, Echt, NL;
Martin Booij, Sittard, NL;
Jan A Hendrix, Born, NL;
Yvonne H Frentzen, Venlo, NL;
Assignee:
DSM N.V., , NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C08J / ;
U.S. Cl.
CPC ...
521 498 ; 521 405 ; 540540 ;
Abstract
The present invention is for a method of preparing purified .epsilon.-caprolactam from carpet waste containing nylon-6. Contaminated .epsilon.-caprolactam is obtained by depolymerizing nylon-6 from carpet waste. A mixture of the contaminated .epsilon.-caprolactam and water is then hydrogenated in the presence of hydrogen and a hydrogenation catalyst in order to produce purified .epsilon.-caprolactam. The amount of contaminated .epsilon.-caprolactam in the mixture can be between 10 and 95% by weight.