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Purification of caprolactam from recycled nylon

United States Patent

5,919,927
July 6, 1999
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of removing 1,11-diamino-6-undecanone from the pyrolysis product of nylon comprising: a) pyrolyzing nylon-6 to form a pyrolyzate containing a caprolactam mixture; b) dissolving the caprolactam mixture in a solvent to form a solution; c) passing carbon dioxide gas through the solution to form a precipitate; d) removing the precipitate from the solution; and e) recovering the purified caprolactam from the solution.
Moens; Luc (Lakewood, CO)
Midwest Research Institute (Kansas City, MO)
09/ 058,403
April 9, 1998
CONTRACTUAL ORIGIN OF THE INVENTION The U.S. government has rights in this invention under Contract No. DE-AC36-83H10093 between the U.S. Department of Energy and Midwest Research Institute.