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Continuous catalysis cracking method for producing fuel oil from mixed waste plastic

A technology of catalytic cracking and waste plastics, which is applied in the field of fuel oil preparation from mixed waste plastics. It can solve the problems of high energy consumption in the heating and cooling process, the inability to form continuous operations, and unstable oil quality. It achieves low operating costs and considerable economy. and social benefits, reducing raw material costs and manufacturing costs

Inactive Publication Date: 2008-09-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past ten years, there have been many reports on the method of using waste plastics to crack fuel oil, and many waste plastics cracking and fuel oil devices have been established in China, but the prior art has obvious deficiencies in the following aspects: A. Waste plastics cracking steam The chemical-to-oil process is an intermittent or semi-interstitial kettle-type operation process, which cannot form a continuous operation, and it is difficult to control the cracking temperature correctly. Furthermore, the heating and cooling process consumes a lot of energy, the process equipment is simple, the safety is poor, the operation is complicated, and it is easy to produce secondary Pollution
B. Since the process conditions of the gap kettle method are difficult to adapt to the cracking of waste plastics with complex components, the quality of the oil produced is unstable, and it can only be used as low-grade products such as boiler fuel.
C. Single-tank cracking uses single-functional solid acid or cheap clay (activated silica) as a catalyst. The distribution range of waste plastic cracking products is too wide, producing a large amount of heavy oil and gas, and the ratio of light oil is low, especially for mixed waste plastics. Cracking oil is more difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] At the entrance of one end of the tubular bed, 100 kg of crushed waste plastics below 20 cm and 2.2 kg of catalyst powder will pass through the hopper with stirring, and the materials will be fed continuously and evenly while mixing, driven by the built-in near-wall scraper in the tubular bed. Under the condition, the material moves slowly from the front section of the tube bed low-temperature dehydration to the high-temperature cracking section. The waste plastics are dehydrated at 160-220°C, and then the waste plastics are cracked at 360-390°C. The moving speed of the materials is adjusted to ensure that the waste plastics The cracking is fully and completely, and 82.4 kg of crude oil is produced in the cracking process, and the yield is 82.4% based on waste plastics. The crude oil is heated and vaporized into the secondary catalytic cracking and upgrading fluidized bed reactor, at a temperature of 390-400°C, a pressure of 1.8bar, and a catalytic reaction space velocit...

Embodiment 2

[0017] At the entrance of one end of the tubular bed, 200 kg of crushed waste plastics and 3 kg (equivalent to 100:1.5 weight ratio) of catalyst powder are continuously mixed and fed, and the waste plastics are dehydrated at 150-210 ° C, and then at 370- Waste plastics are pyrolyzed at a temperature of 390°C. During this pyrolysis process, 81.3 kg of crude oil is produced, and the yield of crude oil is 81.3% based on waste plastics. The crude oil is heated and vaporized into the secondary catalytic cracking and upgrading fluidized bed reactor, at a temperature of 380-390°C, a pressure of 3.1bar, and a catalytic reaction space velocity WHSV of 0.50h -1 Under the condition of catalytic cracking, the yield of the obtained gasoline and diesel fraction relative to the crude oil is 82.5%.

Embodiment 3

[0019] At the entrance of one end of the tubular bed, 150 kg of crushed waste plastics and 3.9 kg (equivalent to 100:2.6 weight ratio) of catalyst powder are continuously mixed and fed, and the waste plastics are dehydrated at 180-250 ° C, followed by 360- Waste plastics are pyrolyzed at a temperature of 390°C. During this pyrolysis process, 81.5 kg of crude oil is produced, and the yield of crude oil is 81.5% based on waste plastics. The crude oil is heated and vaporized into the secondary catalytic cracking and upgrading fluidized bed reactor, at a temperature of 382-398°C, a pressure of 2.5bar, and a catalytic reaction space velocity WHSV of 1.0h -1 Under the condition of catalytic cracking, the yield of the obtained gasoline and diesel fraction relative to the crude oil is 84.9%.

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Abstract

The invention provides a method for successive catalytic pyrolysis of mixed waste plastics to produce burning oil, which relates to a technology to produce the burning oil through pyrolysis of waste plastics. A two-step successive running technology with an integration of catalyzed pyrolysis and pyrolysis catalyzed reforming is adopted, in the technology of pyrolysis in the first step, the successive running of the pyrolysis is accomplished through a fluid tube-type bed technology with an adjuvant transmission device, and a cheap non-toxic catalyst is added to raise the reaction speed of the plastic pyrolysis and decrease the temperature of the pyrolysis; in the second step of refining technology of catalyzed lysis, a fluidized-bed catalyst is adopted to perform the secondary pyrolysis reforming reaction on the cracked gas produced by step one, to increase the percentage of the extract fractions of gasoline and diesel in the liquid fuel produced by pyrolysis. The technology provided by the invention is a wholly concealed successive running procedure with the waste plastics as the raw material without the need of classification, washing or drying, the operation is flexible and the running cost is low, the technology is especially suitable for production of burning oil from mixed waste plastics from urban or suburban garbage with complicated components, the yield rate of the qualified burning oil reaches to more than 66 percent, as calculated on the basis of waste plastics, the technology has observable economic and social benefits.

Description

technical field [0001] The invention relates to a process for producing fuel oil by pyrolysis of waste plastics, in particular to a method for preparing fuel oil from mixed waste plastics obtained from garbage by adopting a two-stage composite catalytic process combining catalytic pyrolysis and pyrolysis catalytic modification. Background technique [0002] A large amount of waste plastics produced in people's daily garbage seriously endangers the living environment of human beings, and is called "white garbage". White garbage is also the most troublesome environmental governance problem for governments of all countries. In the past ten years, there have been many reports on the method of using waste plastics to crack fuel oil, and many waste plastics cracking and fuel oil devices have been established in China, but the prior art has obvious deficiencies in the following aspects: A. Waste plastics cracking steam The chemical-to-oil process is an intermittent or semi-intersti...

Claims

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Application Information

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IPC IPC(8): C10G1/08
Inventor 朱志荣吴倩
Owner TONGJI UNIV
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