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

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...

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