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Process for producing hydrocarbon oil by performing supercritical hydrothermal treatment on waste plastic and straws

A technology for supercritical water and waste plastics, which is used in the treatment of hydrocarbon oil, the preparation of liquid hydrocarbon mixtures, and the petroleum industry. Easy-to-control effects

Inactive Publication Date: 2018-09-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method uses co-thermal cracking of straw and waste plastics to improve the yield and quality of liquid fuels, this method requires the use of solid catalysts, and the coke produced by the cracking is likely to deactivate the catalysts, and the operation period is short, making it difficult to industrialize

Method used

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  • Process for producing hydrocarbon oil by performing supercritical hydrothermal treatment on waste plastic and straws

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment adopts figure 1 Shown reaction device, this device is connected feed pump 5, heat exchange unit 7, phase separator 8, gas storage tank 9, liquid storage tank 10 and residual oil storage tank 11 by horizontal tube reactor 1. composition. The reactor is 60cm long and 12cm in diameter, and 7 reaction tubes are arranged in the reactor, and the diameter of the reaction tubes is 2cm. One end of the reactor is connected to the screw pump 5 through the valve 12 , the other end of the reactor is connected to the heat exchange unit 7 through the valve 14 , and the heat exchange unit is connected to the gas-liquid separator 8 .

[0030] Grinding the transparent PE pipe and corn cob, mixing the crushed plastic and corn cob according to the mass ratio of 5:1 to obtain the mixed raw material, mixing the pulverized mixed raw material and distilled water in the raw material mixing tank 6 to form a slurry material, and mixing the water and The mass ratio of raw materia...

Embodiment 2

[0032]The reaction device used in this embodiment is the same as in Example 1. Grinding the PP film and corn stalks, mixing the crushed plastic and corn stalks at a mass ratio of 1:1 to obtain a mixed raw material, mixing the crushed mixed raw material and distilled water in the raw material mixing tank 6 to form a slurry material, water and mixed raw material The mass ratio is 1:1. The slurry state material is sent into the tube side of the reactor 1 with a screw pump 5, and the reactor is sealed. Circulate the molten salt on the shell side of the reactor to heat the reaction tube, and heat the reactor in two steps. The first step is to heat to 250°C and maintain a constant temperature for 20 minutes. The second step is to raise the temperature to 420°C, and the reaction is carried out for 20 minutes. The pressure inside the tube is self-generated pressure. After the reaction is over, open the valve 14 quickly, and use the pressure inside the reactor to quickly discharge th...

Embodiment 3

[0034] The reaction device used in this embodiment is the same as in Example 1. Grinding the transparent PS lunch box and sorghum stalks, mixing the crushed plastic and sorghum stalks at a mass ratio of 1:5 to obtain mixed raw materials, mixing the crushed mixed raw materials and distilled water in the raw material mixing tank 6 to form a slurry material, water and The mass ratio of the mixed raw materials is 1:2. The slurry state material is sent into the tube side of the reactor 1 with a screw pump 5, and the reactor is sealed. Circulate the molten salt on the shell side of the reactor to heat the reaction tube, and heat the reactor in two steps. The first step is to heat to 200°C and keep it constant for 30 minutes. The second step is to raise the temperature to 430°C, and the reaction is carried out for 10 minutes. The pressure inside the tube is self-generated pressure. After the reaction is over, open the valve 14 quickly, and use the pressure inside the reactor to qui...

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Abstract

The invention relates to a process for producing hydrocarbon oil products by performing supercritical hydrothermal treatment on waste plastic and straws. The straws of farmland waste plants are liableto crack under the supercritical hydrothermal condition to generate active species to trigger cracking of plastic macromolecules, a catalyst is not used, and the problem that the catalyst and the products are difficult to separate is avoided; moreover, the components generated through plant cracking have a solvent effect and can obviously reduce the viscosity of plastic cracking oil. Supercritical water can serve as a solvent and a dispersing agent in the waste plastic cracking process to avoid system coking, the unsaturation degree of the plastic cracking products is reduced through the hydrogen transfer effect, and the stability of the products is improved. By the method, the waste plastic and the farmland waste straws are comprehensively utilized to serve as the raw materials, the costis low, the operation is simple and easy, a hydrogen source is not needed, the yield of the hydrocarbon oil is high and environmental pollution is avoided.

Description

technical field [0001] The invention relates to a process for producing hydrocarbon oil by supercritical hydrothermal treatment of waste plastics and straw mixture, which belongs to the field of solid waste treatment and biomass energy in the field of resource recovery and utilization. Background technique [0002] Discarded plastic products have become a major urban solid waste, among which polyolefin waste plastics (such as PE, PP, PS) account for more than 80%. Since plastics are difficult to degrade in nature for a long time, finding a way to make them reusable is related to the development of human beings and the continuation of civilization. Recycled plastic products produced by technical means such as mechanical processing or physical and chemical modification and regeneration have poor performance and can only be used in downgrades. Converting waste plastics into liquid oil by means of pyrolysis is an effective way to recycle waste plastics. [0003] Patent CN10652...

Claims

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Application Information

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IPC IPC(8): C10G1/00
CPCC10G1/00C10G2300/1003C10G2300/1014
Inventor 李永红刘志远
Owner TIANJIN UNIV
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