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Device and process for continuously separating and recycling waste polyester cotton textiles

A technology for separation and recovery of textiles, which is applied in the field of continuous separation and recovery of waste polyester-cotton textiles. It can solve the problems of continuous industrial production that cannot realize separation and recovery, and the inability to separate polyester and cotton components, and achieve continuous separation. , Guarantee the effect of clean production and high degree of engineering

Inactive Publication Date: 2015-02-04
SHANGHAI JUYOU CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problem in the recycling of waste polyester-cotton textiles is that the polyester and cotton components in waste polyester-cotton textiles cannot be sufficiently and efficiently separated, and the continuous industrialized production of separation and recycling cannot be realized.

Method used

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  • Device and process for continuously separating and recycling waste polyester cotton textiles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The polyester-cotton blended fabric containing 15% of cotton yarn is crushed into 4cm×4cm in size, transported to the alcoholysis kettle, and ethylene glycol 6 times the weight of the polyester-cotton fabric is added, and after alcoholysis at 240°C and 200kPa pressure for 5 hours, Separation through the polyester-cotton separation system, the obtained regenerated cotton is collected and reused after washing and drying. The breaking strength of the regenerated cotton yarn is 14.2cN / tex, and the breaking elongation is 15.5%. The polyester alcoholyzate obtained after separation enters the subsequent polymerization stage after fine filtration and concentration. The precondensation temperature is 278°C, the vacuum degree is 2kPa absolute pressure, the final polycondensation temperature is 285°C, and the vacuum degree is 120Pa absolute pressure. Regenerated PET polyester with a viscosity of 0.67 dl / g.

Embodiment 2

[0066] The polyester-cotton blended fabric containing 20% ​​cotton yarn is crushed into 6cm×6cm size, transported to the alcoholysis kettle, adding ethylene glycol 5 times the weight of the polyester-cotton fabric, and after alcoholysis at 245°C and 300kPa pressure for 4 hours, Separation through the polyester-cotton separation system, the obtained regenerated cotton is collected and reused after washing and drying. The breaking strength of the regenerated cotton yarn is 15.2cN / tex, and the breaking elongation is 16.1%. The polyester alcoholyzate obtained after separation enters the subsequent polymerization stage after fine filtration and concentration. The precondensation temperature is 276°C, the vacuum degree is 1.8kPa absolute pressure, the final polycondensation temperature is 282°C, and the vacuum degree is 105Pa absolute pressure. Regenerated PET polyester with an intrinsic viscosity of 0.70 dl / g.

Embodiment 3

[0068] The polyester-cotton blended fabric containing 25% of cotton yarn is crushed into 8cm×8cm in size, then transported to the alcoholysis kettle, adding ethylene glycol 25 times the weight of the polyester-cotton fabric, and after alcoholysis at 200°C and 50kPa pressure for 7 hours, Separation through the polyester-cotton separation system, the obtained regenerated cotton is collected and reused after washing and drying. The breaking strength of the regenerated cotton yarn is 15.7cN / tex, and the breaking elongation is 16.3%. The polyester alcoholyzate obtained after separation enters the subsequent polymerization stage after fine filtration and concentration. The precondensation temperature is 279°C, the vacuum degree is 2kPa absolute pressure, the final polycondensation temperature is 268°C, and the vacuum degree is 102Pa absolute pressure. Regenerated PET polyester with a viscosity of 0.69 dl / g.

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Abstract

The invention provides a device and process for continuously separating and recycling waste polyester cotton textiles. The device comprises: (1) alcoholysis and polycondensation system, comprising an alcoholysis kettle, an alcoholysis product collecting tank, a fine filter, concentration equipment, a pre-polycondensation kettle and a final polycondensation kettle which are connected in sequence; and (2) a continuous separation system, comprising two sets of continuous separation equipment, an alcoholysis product collecting tank, a cotton fiber collecting and scrubbing tank, a scrubbing solution collecting tank and a cotton fiber collecting tank. The process comprises the following steps: feeding crushed waste polyester cotton textiles into the alcoholysis kettle in which polyester in the crushed waste polyester cotton textiles is subjected to alcoholysis by using ethylene glycol; carrying out continuous separation on mixture of the alcoholysis product and cotton fibers twice to obtain scrubbed cotton fibers and scrubbing solution, wherein both the scrubbed cotton fibers and the scrubbing solution can be recycled; and filtering the separated alcoholysis product, then concentrating and carrying out pre-polycondensation and final polycondensation to obtain regenerated PET polyester. The device and process disclosed by the invention can be used for continuous separation of waste polyester cotton textiles; moreover, the separated polyester and cotton fibers both can be recycled and the solvent also can be recycled.

Description

technical field [0001] The invention belongs to the technical field of resource regeneration, and specifically relates to a device and process for continuous separation and recovery of waste polyester-cotton textiles. The device and process are used to continuously separate waste and old polyester-cotton textiles to recycle them and realize industrialization. Background technique [0002] Lack of resources and environmental pollution are common problems facing the world today. In particular, the chemical fiber industry, which is highly dependent on scarce resources such as oil, has become synonymous with high consumption and high pollution. The annual production capacity of polyester in the optical chemical fiber industry reaches more than 25 million tons, and countless textiles are woven from it. A large amount of textile waste hoarding has formed a new round of "fabric pollution". [0003] In recent years, a lot of exploration work has been carried out in the field of co...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78C08J11/06
CPCY02W30/62
Inventor 汪少朋甘胜华李现顺李红彬
Owner SHANGHAI JUYOU CHEM ENG
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