Method for recycling raw materials from mixed textile waste

• Main Authors: HEHIR RACHID, WEILACH CHRISTIAN, KLAUS-NIETROST CHRISTOPH, THEIS, STEFAN
• Format: Patent
• Language: Chinese; English
• Published: 12.07.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

It is shown a method of recovering raw material from hybrid textile waste comprising the following steps in a given sequence: a) providing a hybrid textile waste comprising at least one cellulosic component and at least one polyester component, b) treating the hybrid textile waste in an aqueous treatment solution, the method comprises the steps of: a) depolymerizing the polyester component and dissolving it in a treatment solution, c) separating the cellulosic component from the treatment solution and recovering the cellulosic raw material, d) filtering the treatment solution to remove foreign substances, in particular dyes and metal ions, from the treatment solution, and e) precipitating terephthalic acid from the treatment solution, separating the precipitated terephthalic acid and recovering a polyester raw material comprising terephthalic acid. In order to be able to recover the raw material with higher purity within the range of the method, it is proposed that the filtration of the treatment solution in