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Method and system for preparing low-carbon olefin from waste plastics

A technology for low-carbon olefins and waste plastics, applied in the field of solid waste plastics treatment, can solve the problems of easy deactivation of catalysts, easy corrosion of pipelines and equipment, and high impurity content, so as to solve the problems of white pollution, high solvent recycling rate and environmental protection. Good results

Active Publication Date: 2022-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problems that the harmful elements Cl and Si impurities in the waste plastic pyrolysis oil obtained in the prior art are high in content, which leads to the easy corrosion of pipelines and equipment in the subsequent process and the easy deactivation of catalysts

Method used

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  • Method and system for preparing low-carbon olefin from waste plastics
  • Method and system for preparing low-carbon olefin from waste plastics
  • Method and system for preparing low-carbon olefin from waste plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0068] Waste plastic A is the waste plastic excavated from a waste landfill in Guangdong. After cleaning and drying, it is broken into <50mm. Heat up to 60°C and enter the waste plastic dissolving and dechlorination unit. The waste plastic dissolving and dechlorination unit adopts an external heating dissolving kettle. , The residence time of waste plastic A in the external heat dissolving tank is 30min, and the dissolved material is separated into chlorine-containing solution and dechlorinated waste plastic at 60°C through a screw extrusion desolventizer.

Embodiment 1

[0069] The organic solvent used in Example 1 is tetrahydrofuran, and the weight ratio of the organic solvent to the waste plastic A is 10:1; the chlorine content in the obtained dechlorinated waste plastic is 23 μg / g.

Embodiment 2

[0070] The organic solvent used in Example 2 was methyl ethyl ketone, and the weight ratio of the organic solvent to the waste plastic A was 10:1; the chlorine content in the obtained dechlorinated waste plastic was 20 μg / g.

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Abstract

The invention relates to a method and a system for preparing low-carbon olefin from waste plastics. The waste plastics are sequentially treated by a waste plastic dissolving and dechlorinating unit and a waste plastic thermal dissolving and impurity removing unit to obtain an impurity-removed plastic-containing solution; and feeding the impurity-removed plastic-containing solution into a catalytic cracking unit, enabling the impurity-removed plastic-containing solution and an optional catalytic cracking raw material to be in contact with a catalytic cracking catalyst for reaction, and separating a reaction effluent to obtain a catalytic cracking product containing low-carbon olefin. The olefin monomer is prepared from the waste plastics, so that the waste plastics are subjected to closed circulation, and the cyclic utilization of the plastics is really realized. The method not only helps to solve the problem of white pollution, but also is low in pollution discharge and good in environmental protection in the production process, reduces carbon emission, and has good environmental benefits, social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of solid waste plastics treatment, in particular to a method and system for preparing low-carbon olefins from waste plastics. Background technique [0002] According to statistics, the total amount of waste plastics in my country is about 1 billion tons and is gradually increasing at a rate of 40 million tons per year. It is estimated that by 2035, the world will generate about 8 billion tons of waste plastics. This not only causes serious environmental pollution, but even affects the ecological balance in the natural environment; it is also a serious waste of petrochemical resources. The existing waste plastics treatment technologies mainly include landfill, incineration, physical recycling and chemical recycling. Among them, due to the slow decomposition speed and low bulk density of waste plastics, landfilling cannot fundamentally solve the problem and is easy to pollute. groundwater resources; and inci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/10C10G1/00
CPCC10G1/10C10G1/006C10G1/008C10G2300/1003C10G2300/4006C10G2300/4012C10G2300/44C10G2300/70
Inventor 邹亮徐润吴治国魏晓丽夏国富李红伟王志强王树青侯吉礼王鹏飞吴玉
Owner CHINA PETROLEUM & CHEM CORP
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