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Preparation of glycine deep eutectic solvent and method for efficient catalytic degradation of polyester fiber by glycine deep eutectic solvent

A low eutectic solvent, polyester fiber technology, used in clean catalysis and green fields, can solve the problems of unsatisfactory recycling, unstable high temperature and easy decomposition, etc.

Active Publication Date: 2019-11-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Deep eutectic solvent is usually a deep eutectic mixture formed by hydrogen bond donors and hydrogen bond acceptors through hydrogen bonds. In recent years, it has been widely used because of its low price, wide range of sources, and biodegradability. Compared with traditional ionic liquids, the eutectic solvent has achieved higher efficiency in catalyzing the alcoholysis of ethylene glycol as a catalyst, but problems such as high temperature instability, easy decomposition, and unsatisfactory recycling still exist.

Method used

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  • Preparation of glycine deep eutectic solvent and method for efficient catalytic degradation of polyester fiber by glycine deep eutectic solvent
  • Preparation of glycine deep eutectic solvent and method for efficient catalytic degradation of polyester fiber by glycine deep eutectic solvent
  • Preparation of glycine deep eutectic solvent and method for efficient catalytic degradation of polyester fiber by glycine deep eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Using polyester fabric as raw material, add 5.0g polyester fabric, 20.0g ethylene glycol and 0.25g (5%wt) catalyst a to a 100ml three-neck flask successively, control the alcoholysis reaction temperature at 180°C, normal pressure, condense and reflux for 1h. Under these conditions, the degradation rate of polyester fiber was 100.0%, and the yield of BHET was 72.0%.

Embodiment 2

[0022] Using polyester fabric as raw material, add 5.0g polyester fabric, 20.0g ethylene glycol and 0.25g (5%wt) catalyst b to a 100ml three-neck flask successively, control the reaction temperature to 180°C, normal pressure, and condense and reflux for 1h. Under these conditions, the degradation rate of polyester fiber was 96.0%, and the yield of BHET was 74.0%.

Embodiment 3

[0024] Using polyester fabric as raw material, add 5.0g polyester fabric, 20.0g ethylene glycol and 0.25g (5%wt) catalyst c to a 100ml three-neck flask in sequence, control the reaction temperature to 180°C, normal pressure, condense and reflux for 1h. Under these conditions, the degradation rate of polyester fiber was 100.0%, and the yield of BHET was 75.6%.

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Abstract

The invention relates to a method for catalytic degradation of waste polyester fiber by a novel catalyst. The method is characterized in that a deep eutectic solvent prepared by using glycine or a derivative thereof or an analog thereof and a metal salt is used as a catalyst, ethylene glycol is used as a solvent, and alcoholysis of polyester fiber is carried out under conditions of 0.25%-1.5% of acatalyst use amount, a reaction temperature of 160 DEG C-197 DEG C, atmospheric pressure, and a reaction time of 15 min-75 min. The method has the advantages that the catalyst is easy to synthesize,the catalytic reaction is fast and efficient, a conversion rate of the polyester fiber is high, yield of degradation products is high, the process is green and recyclable, and the like.

Description

technical field [0001] The invention relates to the technical field of green and clean catalysis, and specifically refers to a new method for catalyzing the alcoholysis of polyester fabric with a deep eutectic solvent prepared by using glycine, its derivatives and analogs, and metal salts as raw materials. Background technique [0002] Polyethylene terephthalate (PET) is an important plastic material, because of its high strength, good heat resistance, high chemical stability, etc., it is widely used in beverage bottles, food packaging, etc. field. According to statistics, in 2010, my country's annual consumption of PET was as high as 23 million tons, and by 2015 it had reached 35 million tons. Fiber consumption accounts for as high as 80.8%. Polyester has good wrinkle resistance and shape retention, and has high strength and elastic recovery ability. Compared with traditional natural fibers, it is widely used due to its durability, wrinkle resistance, non-ironing, and non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C69/82C07C67/00C08J11/24C08J11/28C08L67/02
CPCB01J31/0237B01J2231/00C07C67/00C08J11/24C08J11/28C08J2367/02C07C69/82Y02W30/62
Inventor 周清刘力菲吕兴梅姚浩余孙鹏徐俊丽张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI