K_(2)CO_(3)/KOH协同醇解废弃涤纶纺织品及其制备再生DMT的研究  

K_(2)CO_(3)/KOH synergistic alcoholysis of waste polyester textiles and their preparation ofrecycled DMT

作　　者：陈斌杰 朱子旭 官军 吕维扬 王秀华[1] 姚玉元[1,2] CHEN Binjie;ZHU Zixu;GUAN Jun;L Weiyang;WANG Xiuhua;YAO Yuyuan(National Engineering Lab for Textile Fiber Materials and Processing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Provincial Innovation Center of Advanced Textile Technology,Shaoxing 312000,China;Zhejiang Jiaren New Materials Co.,Ltd.,Shaoxing 312000,China)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,杭州310018 [2]浙江省现代纺织技术创新中心,浙江绍兴312000 [3]浙江佳人新材料有限公司,浙江绍兴312000

出　　处：《丝绸》2024年第5期48-57,共10页Journal of Silk

基　　金：浙江省“尖兵”“领雁”研发攻关计划项目(2022C01197,2023C01203)。

摘　　要：废弃涤纶纺织品囤积量逐年上升,而对废弃涤纶纺织品的综合利用回收率却较低。化学法回收中乙二醇醇解-甲醇酯交换法是一种回收废弃涤纶纺织品的方法,然而乙二醇醇解-甲醇酯交换工艺过程中存在对苯二甲酸双羟基乙酯(BHET)单体产率低、低聚物含量高的问题。文章采用K_(2)CO_(3)/KOH协同醇解废弃涤纶纺织品,并结合响应面法优化了醇解工艺参数,通过甲醇酯交换法制得再生对苯二甲酸二甲酯(DMT),研究了K_(2)CO_(3)/KOH协同醇解对乙二醇醇解-甲醇酯交换产物的影响。结果表明,随着KOH添加量的增加,醇解产物中BHET含量呈现先增加后下降的趋势。当KOH的添加量达到2%时,BHET含量达到最高70.2%。同时,优化后的醇解工艺参数为:反应温度210℃、反应时间120 min、K_(2)CO_(3)质量分数2.0%、KOH质量分数2.4%。此时BHET的收率为73.1%;醇解产物与甲醇酯交换得到再生DMT产率为80.1%,通过减压升华纯化后得到再生DMT含量高于99%以上。Polyethylene terephthalate(PET)is commonly used in textiles and apparel,automotive interior and other fields due to its excellent properties such as high strength and chemical stability.With the rapid development and expansion of polyester textiles,the accumulation of waste polyester textiles is also increasing year by year.However,the waste polyester textiles are difficult to be degraded naturally,posing a significant environmental threat.Recycling waste PET textiles is therefore crucial.Previous studies have identified two main methods for recycling waste polyester textiles:the physical method and the chemical method.The physical method involves regenerating the textiles through simple melting and granulation,but this method does not produce recycled products with good quality and stable performance.The chemical method involves using a depolymerising agent to break down waste polyester textiles into small molecules.These molecules are then polymerized to create a recycled polyester product.This process is a crucial method for producing high-quality recycled polyester products.Currently,chemical methods primarily consist of hydrolysis,alcoholysis,and enzymatic hydrolysis.Among them,the glycol alcoholysis-methanol ester exchange method has gained popularity due to its mild reaction conditions.However,it suffers from low product yield and the formation of oligomers during the alcoholysis stage.Additionally,the ester exchange stage requires a complex product purification process.Current research is focused on addressing these issues.To address the issues of low product yields and increased oligomers in the glycolysis-methanol ester exchange process,this study suggested the use of K_(2)CO_(3)/KOH synergistic alcoholysis on discarded polyester textiles.Firstly,the inexpensive potassium carbonate was used as the primary catalyst in the alcoholysis stage.KOH was also introduced to co-polymerize the waste polyester textiles.Secondly,the response surface method was employed to optimize the process parameters in the alcoh

关 键 词：废弃涤纶纺织品 K_(2)CO_(3)/KOH协同醇解 酯交换 减压升华 再生DMT 

分 类 号：TS102.9[轻工技术与工程—纺织工程] TQ342.21[轻工技术与工程—纺织科学与工程]