Method for separating and recovering waste cotton-polyester blended fabric under subcritical water condition

• Main Authors: HOU WENSHENG, WANG SHUHUA, SHI SHENG, YAN ZHIFENG, ZHANG MEILING, DAI JINMING
• Format: Patent
• Language: Chinese; English
• Published: 17.05.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention discloses a method for separating and recovering waste cotton-polyester blended fabric under a subcritical water condition, and belongs to the field of resource recycling and reuse of waste fabric. Under the conditions that the mass fraction of hydrochloric acid is 0.5-2% and reaction temperature is 130-160DEG C, reaction is carried out for 3-5h, cotton fibers in the waste cotton-polyester blended fabric are decomposed into microcrystalline celluloses, but polyester fibers are not changed, and therefore, the polyester fibers and the microcrystalline celluloses are separated and recovered. The method is suitable for the cotton-polyester blended fabric formed at any ratio and has the advantages of simpleness in operation, short technological process, low energy consumption, light environment pollution and the like. 本发明公开了种亚临界水条件下分离回收废旧涤棉混纺织物的方法，属于废旧纺织品资源化循环再利用领域。本发明在盐酸质量分数为0.5%-2%，反应温度为130-160℃的亚临界水条件下反应3-5h,将废旧涤棉混纺织物中的棉纤维降解为微晶纤维素而涤纶纤维不发生变化，从而分离回收涤纶纤维和微晶纤维素。本发明适用于任意比例组成的涤棉混纺织物，具有操作简单，工艺流程短，能耗低，对环境