1070 results about "Pyrolysis oil" patented technology

[Problem] To provide a method for efficiently producing a chemical product from a waste material containing waste tires by improving each step in a series of processes to realize long-term operation of the processes. [Solution] This method for producing a chemical product involves a pyrolysis step for obtaining, through pyrolysis of a crushed product of a waste material including waste tires, a first gas component, a pyrolysis oil, and a residual component, a low-temperature hydrogenation step for subjecting a raw material oil containing at least part of the pyrolysis oil to a low-temperature hydrogenation treatment at a temperature of 180°C-350°C to obtain a low-temperature hydrogenated oil, a high-temperature hydrogenation step for subjecting a raw material oil containing at least part of the low-temperature hydrogenated oil to a hydrogenation treatment at a temperature higher than that of the low-temperature hydrogenation treatment to obtain a second gas component and a high-temperature hydrogenated oil, a separation step for separating a naphtha fraction from other fractions through atmospheric distillation of an atmospheric distillation raw material oil containing crude oil and at least part of the high-temperature hydrogenated oil, and a steam cracking step for subjecting a steam cracking raw material oil containing at least part of the naphtha fraction and / or other fractions to a steam cracking treatment to obtain a chemical product, wherein the amount of the pyrolysis oil with respect to the total amount of the first gas component, the pyrolysis oil, and the residual component in the pyrolysis step is 40% by mass or more.

Provided is waste plastic pyrolysis oil refining equipment including: a guard bed 100 where a waste plastic pyrolysis oil and a hydrogen gas are introduced and hydrotreated at a first temperature in the presence of a hydrotreating catalyst to produce a fluid from which chlorine has been removed; a main bed 200 where the fluid and the hydrogen gas are introduced from the guard bed 100 and hydrotreated at a second temperature higher than the first temperature in the presence of a hydrotreating catalyst to produce a refined oil from which impurities have been removed; and a recovery tank 300 where the refined oil from which impurities have been removed is recovered from the main bed 200, wherein a temperature before the refined oil is recovered to the recovery tank 300 is maintained at 290° C. or higher and lower than 350° C.

A process for purifying a pyrolysis product. for example a pyrolysis oil and / or a pyrolysis gas. originating from pyrolysis of plastic waste is provided. wherein the process comprises contacting a vaporized pyrolysis oil with one or more adsorption materials and condensing the vaporized pyrolysis oil after it has been contacted with the one or more adsorption materials.

Systems and methods for processing a mixed plastic waste feed to produce a hydrogen-rich hydrocarbon product, such as synthetic crude oil or pyrolysis oil, by processing the mixed plastic waste feed through two cracking units. The first cracking unit is operated at a temperature and a residence time sufficient to at least partially depolymerize the plastic polymers in the mixed plastic waste feed to produce a molten oligomers product stream also containing inorganic components from the mixed plastic waste feed and a gas stream. This molten oligomers product stream is further processed in a thermal or a catalytic cracking unit to produce a hydrocarbonaceous stream that is processed to produce the hydrogen-rich hydrocarbon product, such as a synthetic crude oil that can be processed in a refinery or a pyrolysis oil that can be fed to a steam cracker.

The invention relates to the technical field of photovoltaic module recycling, and discloses a photovoltaic module resource recycling method which comprises the following steps: disassembling a photovoltaic module to obtain a photovoltaic panel and a peripheral module; the photovoltaic panel is fed into a pyrolyzing furnace to be pyrolyzed, a solid product, pyrolysis oil and pyrolysis gas are obtained, and the pyrolysis gas is fed into the pyrolyzing furnace to serve as fuel; sorting the solid product to obtain a soldering tin strip, glass fragments, a battery panel silicon wafer and ash; the glass fragments are fed into a high-temperature melting furnace to be melted into liquid fluid, and the melted liquid fluid is sprayed out through a nozzle of a centrifugal machine to form glass fiber cotton; an acid pickling solution is added into the ash residues, leaching liquid and solid residues are obtained after full reaction, elemental silver is obtained after the leaching liquid is treated, and silicon powder is obtained after the solid residues are subjected to phosphoric acid treatment. According to the invention, the problems of high energy consumption, serious pollution and incapability of fully recycling the waste photovoltaic panel in the existing waste photovoltaic panel recycling method are solved, and the full-component high-value recycling of the waste photovoltaic panel is realized.

The present invention relates to the treatment of plastic materials to be used for chemical recycling processes for the enhancement of substantially plastic materials otherwise destined for disposal.Specifically, the invention relates to a process for the pyrolysis of substantially plastic material to obtain at least hydrocarbons that are liquid at 25° C., comprising the following steps:a) feeding a substantially plastic material to a pyrolysis reactor;b) bringing said material in said pyrolysis reactor to a temperature of between 330° C. and 580° C. in the substantial absence of oxygen and at a pressure of between atmospheric pressure and 13 bara;c) maintaining said material in said pyrolysis reactor for a sufficient amount of time to produce an effluent in the gaseous state;d) partially or fully condensing said effluent in the gaseous state, so as to form at least one fluid comprising hydrocarbons that are liquid at 25° C. and which quantitatively is at least 10% by mass with respect to the mass of substantially plastic material fed;e) carrying out an assessment of at least one property “Px” of the liquid condensed from said effluent in the gaseous state by means of at least one measurement “Ax” of the spectrum in transmission, reflection or transflexion on said condensed liquid;f) adjusting at least one process parameter “Ox” according to said assessment of at least one property “Px”;g) repeating steps e) and f) iteratively so as to keep the said at least one property “Px” substantially constant over time.

The invention discloses an operation method and system for distributed organic solid waste centralized treatment and quality improvement and application, and relates to the field of chemical engineering, the operation method comprises the following steps: respectively carrying out pyrolysis treatment on organic solid waste distributed in different areas to obtain combustible gas and solid combustible materials and / or pyrolysis oil, using the combustible gas as fuel for pyrolysis treatment, and using the solid combustible materials and / or pyrolysis oil for pyrolysis treatment; the solid combustible comprises carbon powder and / or pyrolysis residues; concentrating and gasifying the solid combustibles and / or pyrolytic oil obtained in different areas to obtain mixed gas, dedusting the mixed gas, and converting the dedusted mixed gas by using water vapor to obtain a hydrogen crude product; purifying the hydrogen crude product to obtain a hydrogen product; packaging, storing or conveying the hydrogen product; the method solves the problem that large-scale industrial treatment and economic benefit improvement are difficult to realize due to the fact that the organic solid waste in a distributed area or a remote area has the characteristics of multiple types, small quantity, dispersive distribution, high transportation, recovery and treatment cost and the like.

The invention relates to a process for converting plastics waste into pyrolysis oil for feeding to a steam cracker including the steps of: pre-washing a stream of comminuted waste plastics in a washing liquid comprising washing water and caustic solution; separating the pre-washed comminuted waste plastics to provide a stream of polyolefin-enriched washed comminuted plastics waste; thermally cracking the stream of polyolefin-enriched washed comminuted plastics waste to produce a vaporised hydrocarbon stream; condensing the vaporised hydrocarbon stream into a liquid hydrocarbon stream and gaseous hydrocarbon stream; washing the liquid hydrocarbon stream with caustic solution; separating the liquid hydrocarbon stream from the caustic solution to produce a stream of caustic-washed liquid hydrocarbon and a stream of spent caustic solution; and rinsing the caustic-washed liquid hydrocarbon stream with water; separating the rinsed liquid hydrocarbon stream from the rinsing water to produce a stream of pyrolysis oil and a stream of spent water.

The invention belongs to the technical field of petroleum processing, and particularly relates to a catalyst and a preparation method and application thereof. The raw materials of the catalyst comprise a metal active component, a carrier and an auxiliary agent, the metal active component is sulfides of Mo and Ni elements, the carrier is spherical gamma-Al2O3 of 0.5-1 mm, and the auxiliary agent is P; the carrier is modified by using the metal active component and the auxiliary agent to serve as the catalyst. The high-activity catalyst is synthesized by adopting the strategy of changing the roasting temperature, adding the additive for doping modification and changing the molar ratio of metal active components, the additive is combined with surface aluminum atoms, the framework strength is enhanced, pore channel collapse caused by acid / water erosion is reduced, the water resistance and acid resistance of the catalyst are improved, and the catalytic reaction activity is further improved. The catalyst disclosed by the invention is accurate and controllable in structure, can be synthesized in batches, and can be applied to the co-catalytic hydrogenation process of biomass pyrolytic oil and / or a model compound thereof and petroleum distillate oil and / or VR.

The invention discloses a horizontal solid organic waste pyrolyzing furnace with a multi-stage shearing structure, belongs to the technical field of pyrolyzing furnaces, and aims to improve a traditional single straight-through furnace body structure and divide the whole pyrolyzing furnace into a pyrolyzing part and a preheating part. A shearing discharging column in a preheating part is used for carrying out continuous batch grinding smashing and preheating treatment on organic solid waste, the material granularity is reduced, the pyrolysis speed is increased, in the main pyrolysis link, a double-barrel furnace type structure composed of a pyrolysis barrel and a pyrolysis part is arranged, and under the rotation effect of multiple sets of shearing plates, the pyrolysis barrel and the pyrolysis part can be used for carrying out pyrolysis on the organic solid waste. Small-particle solid waste is in a continuous'upward turning-downward scattering 'multi-stage shearing state, materials are conveyed to the end part of the pyrolysis part along the inclined surface of the shearing plate in the upward turning process, and in the process, generated waste gas, carbon residues and pyrolysis oil are continuously separated through an exhaust passage, a residue discharge opening and an oil discharge hole respectively; and the heat-conducting property in the furnace is improved.

A pyrolysis method and system are provided that enhances the production of alkanes and minimizes the production of aromatics in the resulting pyrolysis oil. More particularly, the disclosed pyrolysis method and system may be configured to enhance the production of alkanes due to the use of certain pyrolysis catalysts and more intense pyrolysis conditions.

The invention discloses a method and equipment for recycling glass fibers in waste fan blades. The method comprises the following steps that S1, the fan blades are subjected to large-size cutting; s2, under the oxygen-free or oxygen-deficient condition, the cut fan blades are heated through electromagnetic heating for pyrolysis, pyrolysis gas, pyrolysis oil and pyrolysis solid residues are obtained through pyrolysis, and the pyrolysis gas and the pyrolysis oil serve as fuel to be recycled; s3, the pyrolysis solid residues are screened, glass fiber bundles are separated out, and the glass fiber bundles are opened and loosened; and S4, processing the loose glass fibers into a fiber disc for treating sewage or polluted air. According to the method and the equipment for recycling and reusing the glass fibers in the waste fan blades, the problems of low additional value, secondary pollution and the like of glass fiber recycling are solved through a fuel and glass fiber dual-recycling method, and the method and the equipment have the advantages of high resource utilization rate, environmental friendliness, economy and wide application prospect. And an innovative solution is provided for zero-waste treatment of the waste fan blades.

Embodiments of the present disclosure relate to a method and system for producing refined hydrocarbons from waste plastic pyrolysis oil. The method and system for producing refined hydrocarbons from waste plastic pyrolysis oil according to the embodiments of the present disclosure may minimize formation of an ammonium salt (NH4Cl) and may prevent an adhesion phenomenon of impurity particles in a reactor in a refining process of waste plastic pyrolysis oil containing impurities including chlorine and nitrogen. In addition, the method and system for producing refined hydrocarbons according to the embodiments of the present disclosure may have excellent refining efficiency and may implement a long-term operation of a process because deactivation of a catalyst used in the process is prevented, and may produce refined hydrocarbons having a low content of impurities and a low content of olefins from waste plastic pyrolysis oil.

The present invention relates to a process for the treatment of a plastics pyrolysis oil, comprising:a) the hydrogenation of said feedstock as a mixture with at least a part of the liquid effluent resulting from stage c) and in the presence of hydrogen and of a catalyst at a temperature between 14° and 340° C.;b) the hydrotreating of said hydrogenated effluent in the presence of hydrogen and of a catalyst;c) a separation of the hydrotreated effluent operated at high temperature and high pressure, in order to obtain a gaseous effluent and a liquid effluent, a part of which is recycled upstream of stage a),d) a separation operated at low temperature and high pressure and fed with the gaseous effluent and the other part of the liquid effluent resulting from stage c) and an aqueous solution, in order to obtain a hydrocarbon effluent.

The invention discloses a cyclone separation and moving particle bed coupled pulverized coal pyrolysis oil gas high-temperature dust removal system, and belongs to the technical field of coal clean utilization. The system comprises a cyclone separator, a fine filtration unit, a filter material cyclic regeneration unit and an intelligent control unit, the fine filtration unit comprises a particle bed, a particle bin is arranged at the top end of the particle bed, and a composite filter material layer is arranged on the particle bed; a dust-containing high-temperature oil gas pipeline and a pretreatment high-temperature oil gas pipeline are arranged at the top end of the cyclone separator, dust-containing high-temperature oil gas is introduced into the cyclone separator through the dust-containing high-temperature oil gas pipeline to be pretreated, and the pretreated dust-containing high-temperature oil gas is introduced into the particle bed through the pretreatment high-temperature oil gas pipeline to be finely filtered; and a coke breeze discharge pipe is arranged at the bottom of the cyclone separator. The invention is used for solving the technical problem of low gas-solid separation efficiency at high temperature caused by the adoption of a single filter material in the existing pulverized coal dust removal system.

The invention discloses waste plastic pyrolysis oil production equipment and a waste plastic pyrolysis oil production process capable of cooperatively controlling pyrolysis temperature through composite heating, and aims to solve the problems of inaccurate thermal field regulation and low energy circulation efficiency in the existing waste plastic pyrolysis oil production technology. The equipment comprises a raw material bin, an extruding machine, a grid type feeder, a preheating bin and a rotary reactor penetrating through a plastic melting furnace, a pyrolyzing furnace and a gasification furnace. An electric heating shoveling plate, a spiral weir plate and a stirring paddle are arranged on the inner wall of the rotary reactor; a pushing mechanism is arranged at the bottom of the preheating bin to continuously convey preheated materials; the flue gas circulating system recovers and reuses flue gas waste heat of all the furnace bodies, organic non-condensable gas separated by the oil gas recovery device is supplied to the combustor, and an energy closed loop is formed. Through the synergistic effect of multi-stage composite heating, dynamic power supply and a spiral flow guide structure, the problems that a traditional device is uneven in thermal field, high in energy consumption and poor in raw material adaptability are solved, and efficient waste plastic pyrolysis oil preparation is achieved.

The invention relates to the technical field of carbon black materials, and discloses special carbon black with high specific surface area and a preparation method thereof, and the special carbon black is prepared by pyrolysis and activation treatment of a precursor mixture, a catalyst and a template agent. The precursor mixture contains a biomass refined product, waste polymer pyrolysis oil and a copolymer template agent, and the performance is optimized through a rotating flow field high-temperature reactor and a microwave-assisted activation process. The carbon black has a hierarchical porous structure, the specific surface area reaches 2000-2500m < 2 > / g, the conductivity is improved by 1-2 orders of magnitude, and the chemical properties can be regulated and controlled through surface functionalization. The low-cost and sustainable production is realized, the mechanical strength, the conductivity and the adsorption performance are remarkably improved, and the requirements of the high-end field are met.

The present invention discloses a pyrolysis oil and gas cutting device and method, comprising a waste rubber pellet pyrolysis module, a pyrolysis oil and gas high-efficiency cutting module, a pyrolysis oil and gas condensation module, a Roots blower, a non-condensable gas pressure-stabilizing and conveying module, and a control module. By spraying cooling water and circulating non-condensable gas onto the high-temperature pyrolysis oil and gas, the present invention utilizes the vaporization of the cooling water to absorb a large amount of latent heat of phase change, fully condensing the high-temperature pyrolysis oil and gas. Furthermore, the generated water vapor and non-condensable gas reduce the partial pressure of low-flash-point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase. While ensuring that the oil product flash point meets standards, the minimum flash point cutting temperature required for condensation of high-flash-point oil is lowered, thereby increasing the yield of high-flash-point oil.

The present invention relates to an improved process for removing silicon from a depolymerized oil, and more particularly to a process for producing a pyrolytic oil, the process comprising the steps of adding alumina in particulate form to waste plastic containing silicone to form a mixture, feeding the mixture to a pyrolysis reactor, in one embodiment, a method for producing an oil product includes heating a mixture in a reactor, pyrolyzing the mixture in the reactor, recovering at least a pyrolysis gas and a solid residue from the reactor, and condensing the pyrolysis gas to provide an oil product wherein the solid residue comprises alumina that reacts with silicon.

The invention relates to a mineral multi-stage separation and upgrading system, which belongs to the technical field of mineral separation and upgrading, and comprises a first separation bed body and a separation assembly arranged on the first separation bed body, the separation assembly comprises a plurality of air chambers which are continuously arranged on the lower side of the first separation bed body along the length direction of the first separation bed body; the multiple air distribution holes are vertically formed in the bed surface of the first separation bed body at equal intervals, and the multiple air valves are vertically and fixedly arranged at the bottom of the air chamber in a one-to-one correspondence mode. Through cooperative use of the air chamber and the air distribution holes in the first separation bed body, airflow is blown out from the air distribution holes, so that oil shale particles on the bed surface are in a fluidized state and move in the length direction of the bed surface, and the oil shale particles are separated from the air distribution holes; pulse airflow is output by the air valve and is blown out through the air distribution holes, so that the movement activity of the stacked and interlaced oil shale particles on the bed surface is enhanced, the oil shale is loose, fluidized and uniformly distributed, the separation of concentrate and gangue is realized, the separation effect of the oil shale particles is ensured, the grade of the oil shale is improved, and the energy consumption of a subsequent pyrolysis oil extraction process of the oil shale is reduced.

The invention belongs to the field of comprehensive utilization of coal chemical solid waste, and particularly relates to a treatment method of direct coal liquefaction residue raffinate, which comprises the following steps: (1) mixing direct coal liquefaction residue and an extraction agent to obtain an extraction system, and carrying out solid-liquid separation on the extraction system to obtain filtrate and filter residue; (2) carrying out distillation treatment on the filtrate to obtain asphalt; and (3) drying the filter residue to obtain a solid, and carrying out pyrolysis treatment on the solid to obtain pyrolytic oil. The method disclosed by the invention has the beneficial effects that the direct coal liquefaction residues are changed into products with industrial application values through a segmented processing method, so that an energy-saving, emission-reducing and resource-saving development mode is realized; a solution is provided for solving the problems of land occupation caused by accumulation and landfill of the direct coal liquefaction residues and serious damage to the ecological environment, and a new way with a wide market economic prospect is explored for realizing high-value utilization of liquefaction residue resources.

The invention relates to an oil-rich coal in-situ underground combustion and pyrolysis oil and gas recovery cooperative system based on high-temperature heat pipes. The system comprises a vertical shaft, a horizontal drill hole and a high-temperature heat pipe set. A high-temperature heat pipe set is arranged on the coal seam of the vertical shaft. A plurality of vertical wells are arranged with the vertical well as the center. Each vertical well is communicated with two parallel horizontal drill holes with different depths in the coal seam, the horizontal drill holes communicated with the adjacent vertical wells are not at the same depth of the coal seam, and four horizontal drill hole groups with different depths are arranged in the coal seam. Oxygen and carbon dioxide are mixed into oxygen-enriched gas, and combustion of coal in a certain horizontal drill hole is achieved. Flue gas generated by coal combustion is subjected to heat exchange through the high-temperature heat pipe set, and water vapor or carbon dioxide is heated. The high-temperature water vapor or carbon dioxide and the high-temperature flue gas after heat exchange enter the other two horizontal drill holes in the coal seam respectively, coal is pyrolyzed, and pyrolysis gas and tar are generated. According to the system, high-quality tar and high-calorific-value pyrolysis gas can be obtained, and only a small amount of energy needs to be provided from the outside.

The invention belongs to the field of wind power, and relates to a waste wind power blade pyrolysis system and method. The system comprises a pyrolysis device, a combustion device, a carbon removal device and a gas return pipe, wherein the internal space of the pyrolysis device can receive external third gas to pyrolyze the blades, output pyrolysis solids to the carbon removal device and output pyrolysis oil gas to the combustion device; the external space of the pyrolysis device heats the internal space by using the first gas, and outputs a second gas; the combustion device is used for receiving and combusting pyrolysis oil gas and air and outputting first gas to an external space; the carbon removal device is used for receiving the pyrolysis solid and the carbon removal gas, removing residual carbon of the pyrolysis solid and then outputting glass fibers to the outside; the gas return pipe is connected with the internal space, and part of the second gas serves as third gas to be fed into the internal space. The blades are heated in a radiation and convection mode, the amount of smoke fed into the pyrolysis device can be adjusted, the pyrolysis process is stable, fiber strength loss is avoided, and the energy utilization rate is increased.

Processes and systems for making recycle content hydrocarbons, including olefins, from recycled waste material. Recycle waste material may be pyrolyzed to form recycle content pyrolysis oil composition (r-pyoil), at least a portion of which may then be cracked to form a recycle content olefin composition (r-olefin). The r-olefin may then be further separated into product streams in a separation zone downstream of the cracker furnace. The presence of recycle content hydrocarbons may facilitate more efficient operation of one or more distillation columns in the separation zone, including the propylene fractionator.

Provided is a method for producing chemical products, including: a pyrolysis step of obtaining a first gas fraction, a pyrolysis oil, and a residual fraction by pyrolysis of a crushed material of a waste material including waste tires; a hydrogenolysis step of obtaining a second gas fraction, a light fraction with a boiling point of 350° C. or lower, and a heavy fraction with a boiling point higher than 350° C. by hydrogenolysis of a raw material oil containing at least a part of the pyrolysis oil; and a steam-cracking step of obtaining a chemical product by steam cracking of a steam-cracking raw material oil containing at least a part of the light fraction.

The invention discloses an oil-rich coal in-situ pyrolysis development layout and semi-coke complete filling mining system and method, which are characterized in that oil-rich coal in-situ pyrolysis mining area optimization, pyrolysis reaction area arrangement, in-situ heat injection pyrolysis reaction, pyrolysis semi-coke resource mining and goaf complete filling are carried out to realize oil-rich coal in-situ depolymerization generation and coal tar and coal gas extraction; semi-coke resource mining, complete strip filling and unmanned intelligent continuous mining equipment are divided, and coal-based solid waste materials and a goaf filling system are utilized to realize semi-coke resource intelligent mining and goaf complete filling. According to the method, the environmental problems of surface subsidence, underground water damage and the like are greatly reduced, and meanwhile mining area solid waste resource utilization and low-carbon treatment are completed. Through the mode of filling after heat injection and extraction pipelines are arranged, the thermal insulation effect and the transportation efficiency of the pyrolysis oil and gas collection pipeline are improved. The intelligent mining operation of complete filling of the pyrolysis semi-coke resources is carried out in a mining-filling parallel mode, and the effects of continuous mining and continuous filling and full mining and full filling are achieved.

The invention discloses a device for preparing a molten carbon fertilizer through solid waste microwave pyrolysis and waste heat recovery, and belongs to the field of solid waste treatment and recycling. The device is composed of a pretreatment unit, a microwave pyrolysis unit, a gas-solid separation unit, a gas phase treatment unit, a solid phase treatment unit and a waste heat circulation unit, solid waste enters a microwave rotary kiln after being dried and crushed, a magnetron generates microwave anaerobic pyrolysis under photovoltaic power supply, and a high-temperature gas-solid product is generated; the cyclone separator is used for separating flue gas from solid carbon, the flue gas is condensed to obtain pyrolytic oil and gas, and waste heat of medium-temperature flue gas is recovered through the heat accumulating type heat exchanger for drying; cooling the solid carbon through a heat pipe heat exchanger, recovering waste heat and liquefying urea, and mixing the solid carbon and the urea in a stirring melting pool to prepare a molten carbon fertilizer; and the waste heat backflow fan sends the carbon waste heat back to the drying chamber. The system is driven by green electricity, gas and solid phase waste heat is recovered through double paths, solid waste efficient pyrolysis-product high value-energy self-circulation is achieved, and energy consumption and carbon emission are reduced.

Provided is a process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene. These waste plastics are then passed through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a pyrolysis oil comprising a naphtha / diesel and heavy fraction, and char. The pyrolysis oil is then passed to a hydroconversion reactor comprising an LTA zeolite based catalyst having an acid site concentration of about 2.7 mol / l. Effluent from the hydroconversion reactor is then sent to a steam cracker.

The present application belongs to the technical field of cracking and dechlorination of chlorinated mixed plastics, and particularly relates to a preparation method of a red mud-based chlorinated mixed plastic pyrolysis composite dechlorination agent and a dechlorination method. First, the coffee grounds are converted into biochar through a hydrothermal carbonization reaction, and at the same time, the reducing gas released during the carbonization of the coffee grounds is used to reduce part of the hematite in the red mud to Fe3O4; then, through a high-temperature carbon thermal reaction, the residual hematite in the red mud is completely reduced to Fe3O4, and at the same time, the composite with the added CaO is realized, and finally, the composite dechlorination agent composed of the modified red mud, the biochar and the CaO is obtained. The dechlorination agent has a suitable specific surface area and an adjustable pore structure, can effectively fix HCl during the cracking of chlorinated mixed plastics, and can further obtain plastic pyrolysis oil with ultra-low chlorine content, and realize the high-value utilization of the red mud and coffee grounds solid waste.

The invention relates to the technical field of waste tire recovery, in particular to a method and a system for preparing biological aviation fuel by hydrogenation of waste tire pyrolysis oil, a pretreatment unit is used for performing multi-stage filtration and preheating treatment on the waste tire pyrolysis oil; the hydrogenation reaction unit is used for carrying out hydrogenation reaction and shallow cracking reaction on the pretreated waste tire pyrolysis oil; the separation and purification unit comprises a hot high-pressure separator, a dechlorination reactor, a cold high-pressure separator, a hot low-pressure separator and a cold low-pressure separator, and is used for carrying out dechlorination reaction and gas-oil-water separation treatment on a product of the shallow cracking reaction; the circulating hydrogen unit is used for providing mixed hydrogen for the system; and the fractionation unit is used for fractionating the product separated by the separation and purification unit to obtain the biological aviation fuel. According to the method, the waste tire pyrolysis oil is converted into the biological aviation fuel by adopting a series hydrogenation process, so that the problem of waste tire treatment is solved, and high-value utilization of resources is also realized.