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Catalytic cracking method and system for waste plastics

A technology of catalytic cracking and waste plastics, which is applied in the field of catalytic cracking of waste plastics, can solve the problems of low added value of products, failure of pyrolysis oil, and substandard products, and achieve good environmental benefits, good environmental protection, and reduced carbon emissions. Effect

Active Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a catalytic cracking method and system for waste plastics in order to solve the problems of low oil yield, substandard products, low added value of products, and the inability of pyrolysis oil to be directly post-processed in the existing waste plastic pyrolysis process.

Method used

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  • Catalytic cracking method and system for waste plastics
  • Catalytic cracking method and system for waste plastics
  • Catalytic cracking method and system for waste plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The crushed waste plastic A is sent to the waste plastic pretreatment unit through the screw feeder. The waste plastic pretreatment unit adopts an external heating dissolving tank, and after mixing with the pretreatment agent and solvent oil, the impurities are removed at 320°C and 1MPa For processing, the residence time of waste plastic A is 30 minutes, and the material after the reaction is separated into insoluble matter and impurity-removed plastic-containing solution by a solid-liquid separation unit. The silicon content in the obtained impurity-containing plastic solution was 1.8 μg / g, and the chlorine content was 17.3 μg / g.

[0062] The solvent oil that adopts is the catalytic cracking diesel oil fraction obtained by the catalytic cracking unit of the present invention, and its distillation range is 205~360 ℃, and the total aromatics content is 78.2 mass %, and the single-ring aromatics content is 53.1 mass %; the weight of solvent oil and waste plastics The rati...

Embodiment 2

[0065] The crushed waste plastic A is sent to the waste plastic pretreatment unit through the screw feeder. The waste plastic pretreatment unit adopts an external heating dissolving tank, and after mixing with the pretreatment agent and solvent oil, the impurities are removed at 300°C and 2MPa For processing, the residence time of waste plastic A is 30 minutes, and the material after the reaction is separated into insoluble matter and impurity-removed plastic-containing solution by a solid-liquid separation unit. The silicon content in the obtained impurity-containing plastic solution was 2.5 μg / g, and the chlorine content was 18.2 μg / g.

[0066] The solvent oil used is refinery VGO, its distillation range is 275-581°C, the total aromatics content is 45.1% by mass, and the single-ring aromatics content is 21% by mass; the weight ratio of solvent oil to waste plastics is 5:1.

[0067] The pretreatment agent used is activated carbon and Fe 2 o 3 A mixture of activated carbon a...

Embodiment 3

[0069] The crushed waste plastic A is sent to the waste plastic pretreatment unit through the screw feeder. The waste plastic pretreatment unit adopts an external heating dissolving tank, and after mixing with the pretreatment agent and solvent oil, the impurities are removed at 300°C and 2MPa For processing, the residence time of waste plastic A is 30 minutes, and the material after the reaction is separated into insoluble matter and impurity-removed plastic-containing solution by a solid-liquid separation unit. The silicon content in the obtained impurity-containing plastic solution was 1.5 μg / g, and the chlorine content was 17.7 μg / g.

[0070] The solvent oil used is catalytic cracking light cycle oil, its distillation range is 156-338°C, the total aromatics content is 76.8% by mass, and the single-ring aromatics content is 63.8% by mass; the weight ratio of solvent oil to waste plastics is 5:1 .

[0071] The pretreatment agent used is activated carbon and Fe 2 o 3 A mix...

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Abstract

The invention relates to a catalytic cracking method and system for waste plastics. The waste plastic is treated by the waste plastic pretreatment 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 catalytic cracking method and system for waste plastics. Background technique [0002] The development of the plastics industry has made great contributions to social development. At present, my country's annual plastic production has reached about 120 million tons, most of which are discarded into the environment after one use. According to statistics, the output of waste plastics in my country is about 2.4-4.8 million tons per year; by 2035, there will be about 8 billion tons of waste plastics in the natural environment in the world. Since it takes 200-500 years for plastics to completely degrade, the waste plastics continue to grow. The accumulation not only caused serious environmental pollution, but even affected the ecological balance in the natural environment. [0003] The existing waste plastic treatment technologies mainly include landfill and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/10C10G1/00
CPCC10G1/10C10G1/006C10G1/008C10G2300/1003C10G2300/4006C10G2300/4012C10G2300/70C10G2300/44C10G2300/80
Inventor 邹亮夏国富魏晓丽侯吉礼徐润李红伟王志强王树青王鹏飞吴治国吴玉
Owner CHINA PETROLEUM & CHEM CORP