Process for recovering waste polyethylene glycol terephthalate (PET) material

A waste and process technology, which is applied in the recycling process field of waste polyethylene terephthalate (PET) materials, can solve the problems of low product added value, high energy consumption, complex plastic recycling process, etc. Processing and viscosity control, the effect of low dosage and fast dissolution rate

Active Publication Date: 2013-02-06
SHUYE ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the plastic recycling process in the prior art is complicated, the energy consumption is high, and the added value of the product is

Method used

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  • Process for recovering waste polyethylene glycol terephthalate (PET) material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The recovery process of waste polyethylene terephthalate material described in the present embodiment comprises the steps:

[0037] (1) Collect waste polyethylene terephthalate bottles, add them to the pulverizer, and pulverize them to obtain waste particles with a particle size of 1-1.5cm;

[0038] (2) At 140°C, put the waste particles into an airtight container filled with N-methylpyrrolidone and stir for 10 minutes to dissolve the waste particles quickly and form a homogeneous solution. In this step, the N-methylpyrrolidone - The weight ratio of methylpyrrolidone to waste granules is 1:10;

[0039] (3) Add activated carbon to the homogeneous solution to absorb the pigment in the homogeneous solution and the waste gas generated during the dissolution of waste particles. After stirring for 20 minutes, stand still to obtain a standing liquid, which is described in this step The weight ratio of activated carbon to waste particles is 1:150;

[0040] (4) Add the static l...

Embodiment 2

[0048] (1) Collect waste polyethylene terephthalate bottles, add them to a pulverizer, and pulverize them to obtain waste particles with a particle size of 1.5 cm;

[0049] (2) At 130°C, put the waste particles into an airtight container containing N-methylpyrrolidone and stir for 5 minutes to dissolve the waste particles quickly and form a homogeneous solution. In this step, the N-methylpyrrolidone - The weight ratio of methylpyrrolidone to waste material is 1:9;

[0050] (3) Add activated carbon to the homogeneous solution to absorb the pigment in the homogeneous solution and the exhaust gas generated during the dissolution of waste particles. After stirring for 18 minutes, stand still to obtain a standing liquid, which is described in this step The weight ratio of activated carbon to waste particles is 1:70;

[0051] (4) adding the static liquid into the first filter with a hole of 380 meshes to filter to obtain a filter residue and a turbid filtrate, wherein the filter re...

Embodiment 3

[0059] (1) Collect waste polyethylene terephthalate film, add it to a pulverizer, and pulverize it to obtain waste particles with a particle size of less than 1.5cm;

[0060] (2) At 150°C, put the waste particles into an airtight container containing N-methylpyrrolidone and stir for 15 minutes to dissolve the waste particles quickly and form a homogeneous solution. In this step, the N-methylpyrrolidone - The weight ratio of methylpyrrolidone to waste material is 1:12;

[0061] (3) Add activated carbon to the homogeneous solution to absorb the pigment in the homogeneous solution and the exhaust gas generated during the dissolution of waste particles. After stirring for 15 minutes, stand still to obtain a standing liquid, which is described in this step The weight ratio of activated carbon to waste particles is 1:200;

[0062] (4) adding the static liquid into the first filter with a hole of 450 meshes to filter to obtain a filter residue and a turbid filtrate, wherein the filt...

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Abstract

The invention discloses a process for recovering a waste polyethylene glycol terephthalate (PET) material. The process is characterized by comprising the following steps of: crushing the waste PET material, dissolving the crushed PET material ion into an organic solvent to form a homogeneous solution; and adding an adsorbent into the homogeneous solution, discoloring and removing insoluble substances, and sequentially filtering and crystallizing to obtain the required crystallized PET material. According to the process for recovering the waste PET material, the recycled polyester intrinsic viscosity control technology, the crystallization technology and the impurity removal technology are realized, water is not required to be added in the whole process, the wastewater discharge is avoided, and the environmental pollution is reduced. The intrinsic viscosity of the recycled PET product reaches 0.77dL/g, the purity is 99.5 percent, and the recovered material reaches a novel level.

Description

technical field [0001] The invention relates to a recovery process of waste plastics, in particular to a recovery process of waste polyethylene terephthalate (PET) materials. Background technique [0002] Polyethylene terephthalate (PET) is a saturated polymer compound formed by polycondensation of terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol. thing. Because of its excellent mechanical properties and wear resistance, good creep resistance and rigidity, low water absorption, high dimensional stability, good thermal stability, excellent electrical insulation properties and excellent chemical resistance, etc., it is It is widely used in various fields such as fibers and beverage bottles. [0003] The main source of waste PET materials is the waste produced in various stages of polyester fiber and filament production process and waste PET beverage bottles. Waste fiber products made of polyester fiber and filament have also become an important sou...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08J11/06C08L67/02
CPCY02W30/62
Inventor 林树光
Owner SHUYE ENVIRONMENTAL TECH CO LTD
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