| 摘要 |
PURPOSE: To purify recoveredε-caprolactam into a highly pure product useful as a raw material for fiber in an industrially advantageous manner by purifying the recoveredε-caprolactam obtained by depolymerizing a thermoplastic resin containing nylon 6 as a main component. CONSTITUTION: The method for purifying recoveredε-caprolactam comprises depolymerizing a thermoplastic resin containing nylon 6 as a main component [e.g. fibrous structures, fiber wastes. resin structures or resin wastes comprising nylon 6 in an amount of >=50wt.%, cellulosic fibers or polyurethane in an amount of 0.1-30wt.%, or protein fibers, a polyacrylate, polyethylene terephthalate or nylon 66]. and subsequently purifying the recoveredε-caprolactam. The depolymerization is preferably performed by depolymerizing the component A in the presence of a phosphoric acid (salt) catalyst and water, and the purification is performed by adding 0.01-20wt.% of an alkali hydroxide to the recoveredε-caprolactam.
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