Purification of Caprolactam from Recycled Nylon

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; ande) recovering the purified caprolactam from the solution.

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