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CN-121136734-B - Method for hydrogenating junked tires

CN121136734BCN 121136734 BCN121136734 BCN 121136734BCN-121136734-B

Abstract

The invention provides a method for hydrogenating junked tires, which comprises the following steps of S1, mixing junked tire particles, liquid oil and a catalyst in an oil slurry stirring tank to obtain oil slurry, S2, mixing the pressurized oil slurry and heated hydrogen into a fluidized bed reactor to react to obtain a reaction product, S3, separating out hot high-fraction gas and hot high-fraction oil from the reaction product in the step S2, S4, decompressing the hot high-fraction oil in the step S3, feeding the hot high-fraction oil into a hot low-fraction tank to obtain hot low-fraction tank low-oil, feeding the hot low-fraction tank low-oil into a supercritical extraction device to separate out liquid oil and carbon black, wherein part of the liquid oil is fed into a step S6, S5, treating the hot high-fraction gas in the step S3, feeding the other part of the liquid oil in the step S4 into a fixed bed hydrofining cracking device to react, and feeding the reaction product into a product fractionating tower to separate out diesel oil and naphtha. The method can improve the yield of the carbon black, the naphtha and the diesel oil produced by hydrogenation.

Inventors

  • GUO LINGCONG
  • LI HUANLONG
  • ZHANG DANDAN

Assignees

  • 上海竣铭化工工程设计有限公司

Dates

Publication Date
20260508
Application Date
20251103

Claims (7)

  1. 1. A method for hydrogenating junked tires, comprising the steps of: S1, sequentially drawing steel wires, cutting and grinding junked tires into junked tire particles with a certain size, and mixing the junked tire particles, liquid oil and a catalyst in an oil slurry stirring tank (1) to obtain oil slurry; s2, filling a catalyst in the ebullated bed reactor (5), then boosting the slurry oil in the step S1 in a booster pump (2), heating the hydrogen passing through a hydrogen heating furnace (4), and then mixing the pressurized slurry oil and the heated hydrogen into the ebullated bed reactor (5) for reaction to obtain a reaction product; S3, separating the reaction product in the step S2 into hot high-pressure gas and hot high-pressure oil through a hot high-pressure separation tank (6); S4, decompressing the hot high-fraction oil obtained in the step S3 into a hot low-fraction tank (9) to obtain hot low-fraction tank bottom oil, and feeding the hot low-fraction tank bottom oil into a supercritical extraction device (3) to separate liquid oil and carbon black, wherein part of the separated liquid oil continuously returns to the step S1 to participate in the reaction, and the other part of the separated liquid oil enters the step S6; S5, cooling the hot high-pressure gas obtained in the step S3 through an air cooler (7), then, separating the cold high-pressure gas, cold high-pressure oil and sulfur-containing sewage in a cold high-pressure separation tank (10), buffering the cold high-pressure gas in a circulating hydrogen buffer tank (14), then, boosting the pressure of the cold high-pressure gas in a circulating hydrogen compressor (12), mixing the boosted circulating hydrogen with high-purity hydrogen, and then, feeding the mixture into a hydrogen heating furnace (4), feeding the cold high-pressure oil and the sulfur-containing sewage into a cold low-pressure separation tank (11), and separating sulfur-containing dry gas, sulfur-containing sewage and cold low-pressure oil; S6, the other part of liquid oil in the step S4 and the cold low-fraction oil in the step S5 enter a fixed bed hydrofining cracking device (17) for reaction, and the reaction product enters a product fractionating tower for separating diesel oil and naphtha; In step S4, the supercritical extraction solvent used in the supercritical extraction device is a mixture of n-butane and isobutane, wherein the weight ratio of n-butane to isobutane is 2:1; the yield of the carbon black generated in the step S4 accounts for 25-50wt% of the weight of the waste tire particles in the step S1.
  2. 2. The method according to claim 1, wherein in step S4, the weight ratio of the supercritical extraction solvent to the hot low-split tank base oil is 3-5:1.
  3. 3. The method according to claim 1, wherein in step S1, the weight ratio of the junked tire particles to the liquid oil is 1:0.8-2.
  4. 4. The method according to claim 1, characterized in that in step S1, the junked tire particles have a size <2000 μm.
  5. 5. The method according to claim 1, wherein in step S2, the weight ratio of the catalyst to the junked tire particles is 1 to 2:1.
  6. 6. The method according to claim 1, wherein in step S1, the catalyst is a homogeneous catalyst, and in step S2, the catalyst packed in the ebullated bed reactor (5) is a microsphere-type supported catalyst.
  7. 7. The method according to claim 1, wherein in the step S2, the reaction conditions are specifically a reaction temperature of 250-450 ℃, a reaction pressure of 3-20 MPa, and a hydrogen-oil volume ratio of 350-1500.

Description

Method for hydrogenating junked tires Technical Field The invention relates to the technical field of oil refining and chemical industry, in particular to a method for hydrogenating junked tires. Background With the continued development of the automobile transportation industry, the amount of scrap tire production has also increased dramatically. The waste tires have the characteristics of corrosion resistance, difficult decomposition under natural conditions and the like, so that the waste tires become the black pollution problem which is concerned in China and the world. How to realize the reduction, harmless, green, recycling, reuse and recycling of the waste tires is a great subject to be solved in the rubber field. The main processing technology of the waste tires at the present stage is the technologies of thermal cracking, catalytic cracking, microwave pyrolysis, retreading utilization and the like, and aims at the cracking technology, the effective product yield is low, the property is poor, the subsequent processing is difficult, and meanwhile, the gas yield is high, so that the economic calculation is not facilitated. The prior art with the publication number of CN202310796016 discloses a hydrogenation method of waste tire pyrolysis oil, which comprises the following steps of (1) carrying out gas phase desulfurization reaction on a waste tire pyrolysis oil raw material in a first hydrogenation reactor in the presence of hydrogen to obtain a gas phase desulfurization reaction product, (2) carrying out gas-liquid separation on the gas phase desulfurization reaction product to obtain a gas phase component and a liquid phase component, (3) carrying out pressurization and hydrogen mixing on the liquid phase component, and then carrying out liquid phase dearomatization reaction in a second hydrogenation reactor to obtain a liquid phase dearomatization reaction product, wherein the N content in the waste tire pyrolysis oil raw material is 3000-10000 mu g/g. The raw materials mainly related to the prior art are pyrolysis oil of waste tires, the processing raw materials are limited, and the method process cannot produce various components of carbon black, naphtha and diesel. The prior art with the publication number CN202310849576 discloses a preparation method of lubricating oil, which comprises the following steps of contacting a raw material containing waste rubber with a catalyst in a closed container under the atmosphere of hydrogen to perform catalytic cracking reaction to obtain a product containing the lubricating oil, wherein the catalyst comprises a carrier, an acidic component and an active component loaded on the surface of the carrier, the active component is at least one selected from ruthenium simple substance, rhodium simple substance, platinum simple substance, palladium simple substance, iridium simple substance and nickel simple substance, and the acidic component is at least one selected from silicotungstic acid, ammonium meta-tungstate, phosphotungstic acid and tungstic acid. The reaction mechanism of the prior art is catalytic cracking, and the yield of the reaction gas is high, but the yield of the liquid is relatively low. Aiming at the problems, the inventor performs a great deal of experimental study on the waste tire hydrogenation technology, and particularly provides a waste tire hydrogenation method which is used for producing carbon black, naphtha and diesel oil by hydrogenation of waste tires and can improve the yield of the carbon black, the naphtha and the diesel oil by hydrogenation. Disclosure of Invention In view of this, the present invention aims to propose a process for the hydrogenation of scrap tyres. The method solves the problems of low effective product yield, poor property, difficult subsequent processing, high gas yield and unfavorable economic accounting aiming at the cracking technology in the prior art. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: a method for hydrogenating junked tires, comprising the steps of: S1, sequentially drawing steel wires, cutting and grinding junked tires into junked tire particles with a certain size, and mixing the junked tire particles, liquid oil and a catalyst in an oil slurry stirring tank (1) to obtain oil slurry; s2, filling a catalyst in the ebullated bed reactor (5), then boosting the slurry oil in the step S1 in a booster pump (2), heating the hydrogen passing through a hydrogen heating furnace (4), and then mixing the pressurized slurry oil and the heated hydrogen into the ebullated bed reactor (5) for reaction to obtain a reaction product; S3, separating the reaction product in the step S2 into hot high-pressure gas and hot high-pressure oil through a hot high-pressure separation tank (6); S4, decompressing the hot high-fraction oil obtained in the step S3 into a hot low-fraction tank (9) to obtain hot low-fraction tank low-oil, and feeding the hot low-fraction