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Method for degrading polyethylene glycol terephthalate (PET)

A technology of polyethylene terephthalate and ethanol, applied in the field of polyethylene terephthalate and degradation of polyethylene terephthalate, can solve the problems of transparency and sanitation, and regenerate Low physical properties of materials, environmental pollution and other problems, to achieve high yield, fast reaction speed, and environmental friendliness

Inactive Publication Date: 2014-03-19
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyethylene terephthalate (PET) is widely used in beverage bottles, fibers, films and other fields due to its excellent performance. With the continuous increase of PET consumption, it is accompanied by how to deal with PET waste If it is not properly recycled, it will not only cause a huge waste of resources, but also cause huge pollution to the environment.
[0003] At present, the main treatment method of waste PET is direct recycling, but due to the influence of impurities, thermal degradation and other reasons, the physical properties of recycled materials are low, and there are problems in transparency and sanitation, and its use is limited.

Method used

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  • Method for degrading polyethylene glycol terephthalate (PET)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] FeCl 2 4H 2 O (1.85 mmol), FeCl 3 ·6H 2 O (3.7mmol) was dissolved in 30ml deionized water at room temperature and under the protection of argon, the resulting solution was added to 25% ammonia solution (10mL) with vigorous mechanical stirring (300rpm). A black precipitate was formed instantaneously. In order to obtain tiny and uniform γ-Fe 2 o 3 Granules, NH 4 The dropwise reaction rate of OH should be accurately controlled, after 15min, Ca(NO 3 ) 2 4H 2 O (33.7 mmol, 0.5 M) and (NH 4 ) 2 HPO 4 (20 mmol, 3.0 M) solution (pH=11) in 100ml, added dropwise to the obtained precipitate within 30 minutes of stirring, and mechanically stirred for 30 minutes. The resulting emulsion mixture was heated to 90 o C. After 2 h, the mixture was cooled to room temperature and aged overnight. The resulting dark brown precipitate was filtered, washed repeatedly with deionized water until neutral, and dried in vacuum air at room temperature. The synthesized sample is at 30...

Embodiment 2

[0026] FeCl 2 4H2 O (1.85 mmol), FeCl 3 ·6H 2 O (3.7mmol) was dissolved in 30ml deionized water at room temperature and under the protection of argon, the resulting solution was added to 25% ammonia solution (10mL) with vigorous mechanical stirring (300rpm). A black precipitate was formed instantaneously. In order to obtain tiny and uniform γ-Fe 2 o 3 Granules, NH 4 The dropwise reaction rate of OH should be accurately controlled, after 15min, Ca(NO 3 ) 2 4H 2 O (33.7 mmol, 0.5 M) and (NH 4 ) 2 HPO 4 (20 mmol, 3.0 M) solution (pH = 11) in 100ml, added dropwise to the obtained precipitate within 30 minutes of stirring, and mechanically stirred for 30 minutes. The resulting emulsion mixture was heated to 100 o C. After 2 h, the mixture was cooled to room temperature and aged overnight. The resulting dark brown precipitate was filtered, washed repeatedly with deionized water until neutral, and dried in vacuum air at room temperature. The synthesized sample is at 30...

Embodiment 3

[0028] FeCl 2 4H 2 O (1.85 mmol), FeCl 3 ·6H 2 O (3.7mmol) was dissolved in 30ml deionized water at room temperature and under the protection of argon, the resulting solution was added to 25% ammonia solution (10mL) with vigorous mechanical stirring (300rpm). A black precipitate was formed instantaneously. In order to obtain tiny and uniform γ-Fe 2 o 3 Granules, NH 4 The dropwise reaction rate of OH should be accurately controlled, after 15min, Ca(NO 3 ) 2 4H 2 O (33.7 mmol, 0.5 M) and (NH 4 ) 2 HPO 4 (20 mmol, 3.0 M) solution (pH = 11) in 100ml, added dropwise to the obtained precipitate within 30 minutes of stirring, and mechanically stirred for 30 minutes. Heat the resulting emulsion mixture to 120 o C. After 2 hours, the mixture was cooled to room temperature and aged overnight. The resulting dark brown precipitate was filtered, washed repeatedly with deionized water until neutral, and dried in vacuum air at room temperature. The synthesized sample is at 30...

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Abstract

The invention provides a method for degrading polyethylene glycol terephthalate (PET). The method comprises the steps of preparing HAP-gamma-Fe2O3, preparing a 1-methyl-3-(3-propyltriethoxysilane) imidazole chloride, preparing a magnetic ion liquid, pretreating a raw material, carrying out catalytic reaction by adopting the catalyst and purifying the product, wherein in the step of carrying out catalytic reaction, PET, the magnetic ion liquid and water are put into a reaction kettle, the mass ratio of PET to the magnetic ion liquid is 1:(0.05-0.15), and the temperature is set to be 200-320 DEG C and the time is set to be 15-30 hours; and after the reaction kettle is cooled to the room temperature after reaction is completed, stirring, standing and layering are carried out, suction filtration is carried out, NaOH is added to the filtrate, suction filtration is carried out again, HCl is added and suction filtration is carried out, thus obtaining a product terephthalic acid. By degrading PET by adopting the method provided by the invention, the degradation rate can be more than 90%.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a polyethylene terephthalate, specifically a method for degrading polyethylene terephthalate. Background technique [0002] Polyethylene terephthalate (PET) is widely used in beverage bottles, fibers, films and other fields due to its excellent performance. With the continuous increase of PET consumption, it is accompanied by how to deal with PET waste The problem, if not properly recycled, will not only cause a huge waste of resources, but also bring huge pollution to the environment. [0003] At present, the main treatment method of waste PET is direct recycling, but due to the influence of impurities, thermal degradation and other reasons, the physical properties of recycled materials are low, and there are problems in transparency and sanitation, and its use is limited. Contents of the invention [0004] In view of the defects in the above-mentioned prior art, the technica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/02C07C31/20C07C63/26B01J31/28
CPCB01J31/28C07C29/1285C07C51/09C07C31/202C07C63/26
Inventor 张丽荣易封萍高洁邹建中
Owner SHANGHAI INST OF TECH
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