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Waste polyester textile recycling method and system

A technology for textiles and polyester, applied in the field of chemical recycling of polyester textiles, can solve the problems of flammable and explosive methanol, complicated process implementation, etc., and achieve the effects of color improvement, simple process and resource saving.

Pending Publication Date: 2018-10-12
SHANGHAI JUYOU CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream chemical recycling method in the market is methanol alcoholysis method, which uses methanol to react alcoholysis with PET to generate methyl terephthalate, and then uses ethylene glycol for transesterification to generate BHET. The recovery rate and product quality of this method are relatively impressive. , but in industry, methanol is flammable and explosive, and the process implementation is relatively complicated, so it is not suitable for large-scale promotion

Method used

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  • Waste polyester textile recycling method and system
  • Waste polyester textile recycling method and system
  • Waste polyester textile recycling method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Waste polyester textile recycling system

[0032] like figure 1 As shown, the waste polyester textile recycling system 100 in this embodiment includes: washing equipment, alcoholysis equipment, purification equipment, polycondensation equipment, pelletizing equipment, spinning equipment, auxiliary equipment and recycling equipment.

[0033] Washing equipment, alcoholysis equipment, purification equipment and polycondensation equipment are connected sequentially through pipelines. The washing equipment has a material conveyor belt, an ethylene glycol spray pipe, and an ethylene glycol waste liquid recovery tank. The alcoholysis equipment has an alcoholysis kettle. The purification equipment has a vacuum distillation kettle, a first dilution kettle, a second dilution kettle and a centrifugal dryer connected in sequence. The polycondensation equipment has prepolymerization tanks and final polymerization tanks connected in sequence.

[0034] The auxiliary agent equi...

Embodiment 2

[0047] The method for recycling waste polyester textiles in this embodiment is also carried out by using the waste polyester textile recycling system 100 in Embodiment 1, including the following steps:

[0048] Step 1, pretreatment section

[0049] Put the waste polyester textiles into the washing equipment, add ethylene glycol and stir for hot washing, the mass ratio of waste polyester textiles to ethylene glycol is 1:2, the mixing time is 30min, the temperature is 130°C, after heating The waste polyester textiles are washed and dried to obtain pretreated textiles.

[0050] Step 2, alcoholysis section

[0051] The pretreated textiles and ethylene glycol are dropped into the alcoholysis kettle according to the mass ratio of 1:1, and then the alcoholysis catalyst zinc acetate is dropped into. The consumption of zinc acetate is 0.2% of the quality of the pretreated textiles, and the reaction temperature is controlled at 190°C, the reaction time is 3h, and the alcoholysis react...

Embodiment 3

[0056] The method for recycling waste polyester textiles in this embodiment is also carried out by using the waste polyester textile recycling system 100 in Embodiment 1, including the following steps:

[0057] Step 1, pretreatment section

[0058] Put the waste polyester textiles into the washing equipment, add ethylene glycol and stir for hot washing, the mass ratio of waste polyester textiles to ethylene glycol is 1:4, the mixing time is 30min, the temperature is 100 ℃, after heating The waste polyester textiles are washed and dried to obtain pretreated textiles.

[0059] Step 2, alcoholysis section

[0060] The pretreated textiles and ethylene glycol are dropped into the alcoholysis kettle according to the mass ratio of 1:1, and then the alcoholysis catalyst zinc acetate is dropped into. The consumption of zinc acetate is 0.4% of the quality of the pretreated textiles, and the controlled reaction temperature is 180°C, the reaction time is 3h, and the alcoholysis reaction...

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Abstract

The invention provides a waste polyester textile recycling method and system. The waste polyester textile recycling method comprises the steps that firstly,ethylene glycol is added into waste polyester textiles for stirring and pretreatment; secondly,the pretreated textiles are placed in an alcoholysis kettle,ethylene glycol is added again for an alcoholysis reaction with zinc acetate as a catalyst,undissolved substances in alcoholysis liquid are filtered out,then the alcoholysis liquid is subjected to reduced pressure distillation,crude polyethylene glycol terephthalate obtained through reduced pressure distillation is purified,and purified polyethylene glycol terephthalate is obtained; thirdly,the purified polyethylene glycol terephthalate is added into a pre-polymerization kettle and subjected to pre-polymerization by adding an catalyst,a prepolymer obtained through the pre-polymerization reaction is put into a final polymerization kettle for final polymerization,discharging is conducted through a melt pump to obtain recycled polyester,and the recycled polyester is sliced.

Description

technical field [0001] The invention relates to the technical field of chemical recycling of polyester textiles, in particular to a method for recycling waste polyester textiles through ethylene glycol alcoholysis and a recycling system thereof. Background technique [0002] With the rapid development of my country's polyester industry, the recycling and reuse of polyester textiles has gradually attracted the attention of the society. Although polyester itself is non-toxic and harmless, it is difficult to degrade in nature. Once it is not handled properly, it may cause pollution to the environment. . Polyethylene terephthalate (PET) is a high polymer obtained by condensation polymerization of ethylene terephthalate (BHET). BHET monomer is obtained by esterifying ethylene glycol with terephthalate. to make. At present, there are two main methods of recycling polyester: physical recycling and chemical recycling. The physical recycling method is to melt and extrude waste text...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08G63/183C08G63/78D01F13/04C08L67/02
CPCD01F13/04C08G63/183C08G63/78C08J11/24C08J2367/02Y02P70/62Y02W30/62
Inventor 甘胜华李红彬吴宝宅何洲丁杨惠勤
Owner SHANGHAI JUYOU CHEM ENG
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