METHOD FOR SEPARATING AND RECYCLING WASTE POLYESTER-COTTON TEXTILE BY MEANS OF HYDROTHERMAL REACTION CATALYZED BY ORGANIC ACID

摘要

A method for separating and recycling a waste polyester-cotton textile by means of a hydrothermal reaction catalyzed by an organic acid, comprising the following steps: cutting a waste polyester-cotton textile into fragments and dispersing in an aqueous solution system of an organic acid catalyst to obtain a mixed system; in a high-pressure reactor, heating the mixed system to 110-180°C so that cotton fibers in the waste polyester-cotton textile undergo a degradation reaction for 0.5-3 h to obtain a mixture; and filtering the mixture by means of a sieve, washing to obtain a polyester fiber aggregate, and then filtering the remaining portion by means of a filtration membrane in vacuum so as to obtain cotton fiber fragments after washing. The processing procedure of the method is advanced and simple, and the catalyst used during processing is derived from nature and is biodegradable, not decomposing during processing, and not polluting the environment; the present invention may effectively achieve the separation, recycling and reuse of waste polyester-cotton textiles.