Method for producing waste plastic oil through normal-pressure hydrofining

Abstract

The invention provides a method for producing waste plastic oil through normal-pressure hydrofining. The method comprises the following steps: by using waste plastic oil obtained by pyrolyzing waste plastic as a raw material, and carrying out a gas-phase hydrogenation reaction on the waste plastic oil under the action of a heterogeneous catalyst under the reaction conditions of one atmospheric pressure and 350-400 DEG C, thereby obtaining ether hydrocarbon fuel after the reaction is completed, wherein the catalyst is prepared from the following components in parts by weight: 3 parts of cerium dioxide, 3 parts of titanium dioxide, 1 part of zirconium oxide, 5 parts of zeolite and 5 parts of carbon fibers. The invention provides the simple and efficient method, the waste plastic oil can be hydrogenated at normal temperature and normal pressure to obtain the ether hydrocarbon fuel with excellent emission indexes, the technical problems that high-pressure hydrogenation is needed and the emission indexes of the obtained diesel oil are poor in the prior art are solved, and the method has good market application prospects.

Description

technical field [0001] The invention belongs to the field of deep processing of waste plastic oil, and in particular relates to a production method of atmospheric pressure hydrogenation and refining of waste plastic oil. Background technique [0002] In the production process of my country's recycled paper industry and other production enterprises, a large amount of solid pollutants, mainly waste plastics, are produced, most of which cannot be used as raw materials for recycled plastics, and can only be treated as waste. These wastes can neither be used as landfills to cause white pollution, nor can they simply be burned in ordinary tin furnaces to produce dioxins. In this regard, how to deal with waste plastics in the recycled paper industry has become a bottleneck for the survival and development of enterprises, and the society is currently paying great attention. [0003] The existing disposal methods of waste plastics are roughly as follows: 1. Garbage incineration, but...

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Problems solved by technology

[0003] The existing disposal methods of waste plastics are roughly as follows: 1. Garbage incineration, but it will cause air pollution; 2. Landfill and natural degradation, but it will cause water pollution and soil pollution; 3. Simple cracking into low-quality fuel oil to enter Market, but the production process is seriously polluted, the product quality is poor, and the market reuse process causes secondary pollution, which has been strictly prohibited by the state and has basically disappeared.

4. Drawing on waste oil and waste solid (organic) treatment technology, the most effective method at present is "high-pressure hydrogenation", which completely decomposes waste plastics into hydrocarbon oil under high temperature and high pressure conditions, but it is currently a world problem, and the technical components High, there are many factors in the treatment process, and plastics are prone to coking during the pyrolysis process, so it is difficult for the "high-pressure hydrogenation" technology to be widely promoted in the treatment of waste plastics in paper mills

[0004] Chinese patent document CN 108517222 A discloses a continuous production process for producing high-purity combustible gas from waste plastics in recycled paper mills. It first pyrolyzes waste plastics with water to generate combustible gas mixtures, and then decomposes the plastics through secondary pyrolysis. Crude oil is repeatedly cracked into combustible gas, which needs to undergo multi-stage cooling, separation and purification. The process flow is complex, and coking is still prone to occur in the secondary high-temperature cracking process. The combustible gas generated by cracking includes a mixture of hydrogen, isobutylene and methane. Difficult to achieve clean production

This method uses a large amount of organic solvent, the post-treatment process is complicated, and a large amount of organic waste liquid is produced, and clean production cannot be realized.

[0006] On the other hand, the existing catalytic cracking process, due to the poor thermal conductivity of plastics, has the characteristics of gradually absorbing heat and liquefying. Once the liquefied plastics are out of the heat environment, they will still become solids instead of monomers. It takes a long time for plastics to form monomers. time, so the yield of catalytic cracking process liquid is very low; at the same time, plastics are prone to dehydrocarbonation and condensation reactions under high temperature cracking, and the obtained liquid oil has low content of saturated hydrocarbons and poor oxidation resistance. It is obtained by high temperature cracking of waste plastics. The quality of the fuel oil is extremely low, and it is easy to form soluble colloids, accompanied by blackening and peculiar smell, so it is difficult to carry out post-processing

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