废旧涤纶织物的溶剂萃取剥色及其对醇解的影响  

Decolorization of waste polyester fabrics by solvent extraction and its influence on glycolysis

作　　者：朱琳[1] 王展鹏 吴宝宅 汪少朋 刘一鸣[1] 代成娜 陈标华 ZHU Lin;WANG Zhanpeng;WU Baozhai;WANG Shaopeng;LIU Yiming;DAI Chengna;CHEN Biaohua(College of Environmental Science and Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Sinceyou Technology&Engineering Co.,Ltd.,Beijing 100124,China)

机构地区：[1]北京工业大学环境科学与工程学院,北京100124 [2]北京芯友工程技术有限公司,北京100124

出　　处：《纺织学报》2025年第1期103-110,共8页Journal of Textile Research

基　　金：国家自然科学基金面上项目(22178009)。

摘　　要：针对有色废旧涤纶织物乙二醇醇解回收过程中染料残留问题,利用溶剂萃取法进行醇解前剥色处理,进一步考察剥色对涤纶织物醇解性能的影响。综合考虑涤纶织物的剥色率及质量损失情况,从多种类型溶剂(单一有机溶剂、混合有机溶剂、低共熔溶剂)中筛选出性能优异的乙酸和氯苯2种溶剂,系统探究了剥色温度、固液比和剥色时间等条件对织物剥色效果的影响,发现当剥色温度为130℃,固液比为1∶30,剥色时间为20 min时,乙酸和氯苯对9种市售涤纶织物都有较好的剥色效果,最佳剥色率分别为82.9%和88.4%。剥色前后对废旧涤纶织物进行乙二醇醇解实验,结果表明,乙酸和氯苯的使用能够普遍提高醇解产物的回收率,最高可使回收率分别增加11.44%和12.48%,且回收产物的纯度均高于90%,有助于废旧涤纶织物的高效回收。Objective With the rapid growth of textile consumption,its effective recycling has become an urgent challenge.Polyethylene terephthalate(PET)is a major commercial fabric material,with significant annual production and consumption.Due to production requirements,a variety of dyes and auxiliaries are usually added to PET fabrics,and these additives cause degradation of product quality in the chemical recycling process,which is not conducive to achieving high-value recycling and closed-loop recycling.Therefore,it is necessary to pre-decolorize the fabrics so as to reduce the burden for the subsequent purification of bis(hydroxyethyl terephthalate)(BHET).In this study,it was proposed to decolorize PET fabrics using solvent extraction method,and the influence of decolorization on PET glycolysis performance were further examined.Method The PET fabrics samples were cut into small pieces of approximately 2 cm×2 cm beforehand,and the PET pieces were washed and dried.Then,a certain amount of PET samples was added into solvent in a three-neck flask,which was connected with a condenser.The flask was placed in an oil bath to maintain the required temperature.After decolorization,the fabrics pieces were taken out and washed,dried in an oven at 60℃.The L*,a*,b*values before and after decolorization were determined by chromameter,and then the decolorization ratio was calculated.The gravimetric method was adopted to calculate the BHET recovery rate of PET glycolysis.The purity of the recovered BHET was determined by high-performance liquid chromatography.Results Solvent screening experiments among different types of solvents(i.e,single organic solvent,mixed solvent,and deep eutectic solvent(DES))were conducted based on the decolorization ratio and PET textile mass loss for two single-color PET fabrics.Among them,DES was found not suitable for use as a decolonization solvent because of its high viscosity.Considering the general decolorization effect of solvents on PET fabrics,acetic acid and chlorobenzene,which are more effectiv

关 键 词：废旧纺织品 涤纶织物 溶剂萃取 剥色 乙酸 氯苯 醇解 回收再利用 

分 类 号：TS159[轻工技术与工程—纺织材料与纺织品设计]