Method for degrading polyester fiber-containing clothes into DMT

• Main Authors: XU GUANGQIANG, YANG RULIN, WANG QINGGANG, WANG LIANG
• Format: Patent
• Language: Chinese; English
• Published: 26.07.2024
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; DISPOSAL OF SOLID WASTE; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; RECLAMATION OF CONTAMINED SOIL SOIL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a method for degrading polyester fiber-containing clothes into DMT, and belongs to the technical field of organic chemical industry. The method solves the problem that in the prior art, an efficient and high-selectivity recycling method for the PET fibers is lacked. The method comprises the following steps: separating PET waste clothes to obtain a pure PET oligomer, heating and stirring by using methanol as a reaction reagent in the presence of normal pressure, heating and a compound metal catalyst, and attacking molecular chains of the PET oligomer by methanol in the presence of the compound metal catalyst to depolymerize to obtain the product DMT. 本发明公开了一种将含聚酯纤维衣服降解至DMT的方法，属于有机化工技术领域。本发明解决了现有技术中缺乏对于PET纤维高效高选择性的回收方法。本发明首先将PET废旧衣服进行分离，获得纯净的PET低聚物，随后在常压、加热和复配金属催化剂条件存在下，使用甲醇作为反应试剂进行加热搅拌，在复配金属催化剂的存在下，甲醇进攻PET低聚物分子链发生解聚，获得产物DMT。