31 results about "Solvent refining" patented technology

The invention belongs to the technical field of coking product extraction and organic separation, and particularly relates to a method for refining 2, 3, 5-tricresol and 3-methyl-5-ethyl phenol from a tricresol mixture. According to the method for refining the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol from the tricresol mixture, the tricresol mixture is rectified to obtain the mixed tricresol, the mixed tricresol and the isobutene are subjected to the tert-butylation reaction under the action of the catalyst, and due to the fact that the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol do not react with the isobutene, the 2, 3, 5-tricresol and the 3-methyl-5-ethyl phenol are not reacted with the isobutene. The method comprises the following steps: taking 2, 3, 5-trimethylphenol as a raw material, reacting other phenols with isobutene to generate corresponding tert-butyl phenol, boiling point of a tert-butyl product is obviously higher than that of 2, 3, 5-trimethylphenol and 3-methyl-5-ethyl phenol, performing rectification to obtain a 3-ethyl-5-cresol crude product and a 2, 3, 5-trimethylphenol crude product, and performing solvent refining and melt crystallization to obtain 3-ethyl-5-cresol of which the content is greater than or equal to 99% and 2, 3, 5-trimethylphenol of which the content is greater than or equal to 99%.

The invention relates to the technical field of chemical recovery, and particularly discloses a carbon tetrachloride removal system and process, the system comprises a washing tower and a carbon tetrachloride removal assembly, the washing tower is used for introducing a solvent and a phosgene material; the tower top of the washing tower is used for outputting treated substances; a tower kettle of the washing tower is communicated with the carbon tetrachloride removal assembly, and the carbon tetrachloride removal assembly is used for removing carbon tetrachloride in materials from the washing tower. The solvent is introduced into the washing tower to wash the phosgene material, and after the solvent is introduced, the washing tower is not pure phosgene equipment, so that the safety performance is improved; and compared with the prior art that carbon tetrachloride is removed by utilizing a phosgene rectifying tower and a solvent refining tower, the combination of the washing tower and the carbon tetrachloride removal assembly is beneficial to reducing the energy consumption.

This application relates to the field of organic synthesis technology, specifically disclosing a process for preparing tert-butyl vinyl ether. The raw materials include solid tert-butanol, acetylene, tetrahydrofuran solvent, and potassium hydroxide catalyst, supplemented with auxiliary materials such as type 3A molecular sieves and activated alumina adsorbents. The preparation method involves: after dehydration and purification of the raw materials, the materials are introduced into a reaction vessel; temperature and pressure are controlled, and the reaction endpoint is monitored using an infrared spectrometer; byproducts are quenched and acetylene is recovered; the process involves multi-stage condensation, water washing to remove impurities, distillation separation, and solvent purification and recycling, with simultaneous integration of waste heat recovery and continuous material feeding. The tert-butyl vinyl ether prepared by this process, as an important fine chemical intermediate, can be used in coatings, adhesives, and polymer material modification, possessing advantages such as high purity and good stability. The preparation method achieves efficient utilization of materials and energy through multi-stage synergistic linkage, combining the advantages of green environmental protection, continuous and stable operation, and high resource utilization.

The invention relates to the technical field of petrochemical engineering, in particular to a method for producing an anti-gassing component of transformer oil. The method comprises the following steps: step 1, taking distillate oil solvent extract oil of the transformer oil as a raw material, performing extraction in a counter-current extraction tower by adopting a double-solvent double-tower extraction process to obtain solvent refined oil of the anti-gassing component of the transformer oil; and step 2, under the action of a hydrofining catalyst, hydrofining the solvent refined oil of the transformer oil anti-gassing component to obtain hydrofined oil, namely the transformer oil anti-gassing component. The anti-gassing component of the transformer oil prepared by the invention is low in basic nitrogen content, high in total content of monocyclic and bicyclic aromatic hydrocarbons, good in gassing property and excellent in oxidation stability.

The invention discloses a method for preparing a silicon-based high-entropy negative electrode material of a lithium ion battery from a photovoltaic silicon waste material, and belongs to the technical field of secondary resource high-valued recycling and energy storage materials. The method specifically comprises the following steps that (1) the diamond wire cutting silicon powder waste is subjected to acetone ultrasonic cleaning, water cleaning and drying; (2) high-temperature vacuum refining and furnace cooling; (3) crushing, solvent refining, electromagnetic directional solidification and furnace cooling; (4) cutting and separating to obtain a silicon enrichment area; (5) preparing a target element material according to the component proportion of the silicon-based high-entropy negative electrode material of the lithium ion battery; (6) carrying out vacuum induction melting on the silicon enrichment area and a target element material, standing, carrying out heat preservation, and cooling; (7) crushing; and (8) screening. The silicon-based high-entropy negative electrode material of the high-performance lithium ion battery is designed and prepared by utilizing a'compensation regulation and control method ', the impurity removal process can be shortened, the energy consumption can be reduced, and the preparation of the silicon-based high-entropy negative electrode material of the high-performance lithium ion battery is realized through reasonable component blending and tissue control.

This invention belongs to the field of chemical recycling technology, specifically relating to an apparatus and method for treating toluene diisocyanate tar residue. This invention combines a pre-fractionation tower, a solvent dehydration tower, and a solvent refining tower into a single complex tower (partition wall tower), thereby optimizing the process flow and improving energy efficiency. It also features thermal coupling and equipment integration, achieving a high degree of coupling between matter and energy during the separation process, saving on equipment investment and energy.

The utility model discloses an impurity separating device for refining a waste lubricating oil solvent, which comprises a separating cylinder, a supporting piece is mounted at the bottom of the separating cylinder, an access cover plate is fixed at one end of the separating cylinder, a rotary scraper is movably connected between the separating cylinder and the access cover plate, and a separating filter screen is welded on the surface of the rotary scraper. And a driving motor is fixed on the outer wall of one side of the separation cylinder. According to the utility model, the driving motor is used for driving the separation filter screen and the rotary scraper to do reciprocating swing at a certain angle, and the waste lubricating oil solvent is continuously shaken in the swing process of the separation filter screen and the rotary scraper, so that the separation rate of impurities in the waste lubricating oil solvent is accelerated; after the driving motor drives the separation filter screen and the rotary scraping plate to rotate by 180 degrees from the initial stage, the separation filter screen is inverted, the separation filter screen and the rotary scraping plate are driven to swing in a reciprocating mode, impurities on the separation filter screen fall into the bottom of the separation cylinder under the action of self gravity and shaking, and cleaning of the impurities intercepted on the separation filter screen is achieved.

The invention discloses an emulsion stabilizer as well as a preparation method and application thereof, and belongs to the technical field of lubricating oil. The emulsion stabilizer is prepared from the following components in parts by weight: 20 to 30 parts of nonyl-N-(nonylphenyl) aniline, 0.1 to 1 part of diphenylamine, 0.1 to 10 parts of nonionic surfactant, 1 to 10 parts of solvent refined heavy paraffin fraction, 1 to 10 parts of solvent dewaxed heavy paraffin fraction, 30 to 50 parts of hydrogenated petroleum heavy alkane fraction and 5 to 10 parts of molybdenum-containing composition, wherein the molybdenum-containing composition is a reaction product of N, N-bis (hydroxyethyl) cocamide, glyceryl monooleate and molybdenum oxide. The emulsion stabilizer is applied to lubricating oil of a hybrid power engine, the emulsion stability is good, the abrasion resistance, oxidation resistance, water resistance and corrosion resistance of the lubricating oil in the hybrid power engine can be remarkably improved, meanwhile, good low-temperature fluidity and high-temperature stability are kept, and the influence of free water on the lubricating oil can be effectively reduced.

The application provides a dimethyl sulfoxide recovery system and a recovery method. The recovery system comprises a front dehydration tower, a solvent flash tank, a rear dehydration tower, a solvent refining tower and a heavy-removing flash tank. The recovery system is provided with the solvent flash tank and the heavy-removing flash tank, and the heavy-removing flash tank is provided with a different forced external circulation heating system. The solvent can be further recovered, and the solvent loss is reduced. The problems of high energy consumption, high solvent loss, low solvent recovery rate and low purity of recovered solvent in the solvent recovery process in the carbon fiber production process are solved, and the application prospect is wide.

The invention discloses a method and equipment for processing and producing second-class base oil by taking first-class base oil regenerated by waste lubricating oil as a raw material, and belongs to the technical field of regenerated lubricating oil. Atmospheric and vacuum distillation is combined with NMP solvent refining, and the waste lubricating oil is regenerated into qualified first-class base oil to serve as an exclusive raw material; preheating the raw material to 60-80 DEG C under the protection of nitrogen, and introducing the preheated raw material into an adsorption column at a flow rate of 0.5-2.0 BV / h, so that the raw material sequentially passes through a macroporous silica gel layer (the particle size is 0.1-1.5 mm) and an active white clay layer (the mass ratio of the macroporous silica gel layer to the active white clay layer is 2: 1) with specific parameters, and deep synergistic adsorption refining is carried out; after the refined oil enters a storage tank, vacuum is applied to suck residual oil in the column into the tank, and second-class base oil is obtained after heat preservation sedimentation and precise filtration. Under the mild non-hydrogenation condition, high added value upgrading of the waste lubricating oil is achieved, and the method has the comprehensive advantages of being efficient in process, high in product yield, stable in quality and low in energy consumption and cost.

The invention relates to a preparation method of a melanin precursor. The preparation method comprises the following steps: dissolving dopamine hydrochloride or a derivative thereof to prepare a solution A; the method comprises the following steps: complexing phenanthroline and iron to form a catalyst phenanthroline-Fe (II); preparing ammonium ferric sulfate and a buffer agent into a buffer solution B; dropwise adding the solution B into a mixed solution of the solution A and phenanthroline-Fe (II) to form a reaction solution; adding a reducing agent for quenching reaction; the quenched reaction system is subjected to filtration, extraction and liquid separation operation to obtain an organic phase containing a product, and then the product melanin precursor is obtained through the steps of solvent removal and refining. According to the invention, dopamine hydrochloride or a derivative thereof is used as a raw material, phenanthroline-Fe (II) is used as a catalyst for a single-electron oxidation reaction, and cheap ammonium ferric sulfate is used as an oxidizing agent, so that efficient synthesis of the melanin precursor is realized, and the method has the advantages of low raw material cost, short synthesis route, mild reaction conditions, simple post-treatment, few three wastes and easiness in realization of large-scale production.

The application discloses an NMP solvent refining and concentrating recovery device and a control method. The device comprises an absorption tower, a three-stage series connection rectifying tower group, a reflux system, a PLC main controller, a sensor group and an actuator. Gradient dewatering and step-by-step refining are realized through a vertical tower body structure and a waste heat recovery assembly. The control method comprises online calculation of the separation efficiency of each tower, the actual product purity and the total reflux ratio of the system based on real-time collected concentration and process parameters, automatic switching of the purification degree, energy saving or maintenance mode according to the purity and energy consumption state, and cyclic regulation and control of the reflux ratio and heating power of each tower. Through three-stage gradient rectification, waste heat recovery and PLC three-tower coupling regulation and control, the application can output high-purity semiconductor-grade NMP, effectively reduce the system energy consumption and improve the operation stability.

The present application relates to a production method of high aromatic hydrocarbon environment-friendly rubber plasticizer and lubricating oil base oil. Its characteristics are that two extraction towers are combined in series to form a continuous high aromatic hydrocarbon environment-friendly rubber plasticizer extraction production process, lubricating oil solvent refined extracted oil is used as raw material, two extraction towers respectively carry out double-solvent extraction process and single-solvent extraction process, the lubricating oil base oil obtained by single-solvent extraction process is blended with raw oil, then double-solvent extraction is carried out, the refined oil obtained by double-solvent extraction is subjected to single-solvent extraction to separate out lubricating oil base oil, and high aromatic hydrocarbon environment-friendly rubber plasticizer product is obtained at the same time. The process can improve the C A value of the product under the premise of meeting the requirements of other properties of the product.

The embodiment of the invention provides a water-containing non-polar solvent refining device and a water-containing non-polar solvent refining method. The first outlet end of a two-phase separator is connected to the inlet end of a heavy-phase pervaporation assembly, and the second outlet end of the two-phase separator is connected to the inlet end of a light-phase pervaporation assembly; wherein the heavy-phase pervaporation assembly and the light-phase pervaporation assembly both adopt molecular sieve dehydration membranes for dehydration. Therefore, the water-containing non-polar solvent can be separated before dehydration, so that the condition that a mixed phase exists in the water-containing non-polar solvent is reduced, and the condition that the dehydration performance of the water-containing non-polar solvent refining device is influenced by the mixed phase in the water-containing non-polar solvent is reduced; and the water-containing non-polar solvent refining device can be used for respectively dehydrating the separated heavy-phase component and light-phase component by adopting a molecular sieve dehydration membrane, so that the dehydration efficiency of the water-containing non-polar solvent refining device is favorably improved.

The invention belongs to the technical field of petroleum refining, and particularly relates to a solvent refining method for producing an aryl rubber plasticizer or lubricating oil base oil, which is characterized in that two pipelines are additionally arranged on an industrial lubricating oil solvent refining device, one pipeline is a pipeline from the bottom of a solvent drying tower to extract liquid, and part of the solvent is returned to an extract liquid system; and the second pipeline is a pipeline from the bottom of the extract oil stripping tower to the extract liquid inlet heating furnace, returning part of the extract oil to the extract liquid system, or from the extract liquid inlet heating furnace to the extract liquid system. The method simultaneously meets the production requirements of environment-friendly rubber plasticizers and common lubricant base oil, the operation of an extract solvent recovery system is not greatly adjusted when the environment-friendly rubber plasticizers are produced, the solvent content in the extract oil is qualified, and the problems that the solvent content in the extract oil exceeds the standard and the cost is low are solved. Or the solvent in the extracted oil does not exceed the standard only by carrying out large process parameter adjustment.

The invention relates to the technical field of petrochemical engineering, in particular to a method for producing an anti-gassing component of transformer oil. The method comprises the following steps: step 1, taking extract oil of transformer oil fraction hydrodeacidification oil as a raw material, carrying out extraction in a counter-current extraction tower by adopting a double-solvent extraction process to obtain solvent refined oil of the anti-gassing component of the transformer oil; and step 2, solvent refined oil of the anti-gassing component, wherein the base oil obtained by liquid phase denitrification and carclazyte refining is the anti-gassing component of the transformer oil. The anti-gassing component of the transformer oil prepared by the invention is low in basic nitrogen content, high in total content of monocyclic and bicyclic aromatic hydrocarbons, good in gassing property and excellent in oxidation stability.

The invention is suitable for the technical field of tire rubber oil preparation, and provides a preparation method of high-aromatic-hydrocarbon environment-friendly tire oil, which comprises the following steps of: firstly, preparing high-aromatic-hydrocarbon naphthenic base oil by using naphthenic heavy oil vacuum distillate oil as a raw material through a hydrotreating process or a solvent refining combined process; heavy oil catalytic cracking oil slurry, naphthenic heavy oil vacuum residue or propane deoiled asphalt subjected to solid removal treatment are used as raw materials, and molecular distillation topping treatment is performed to obtain heavy component oil with low saturated hydrocarbon content; and finally, blending the high-aromatic-hydrocarbon naphthenic base oil with the heavy component oil which is subjected to molecular distillation topping treatment and has low saturated hydrocarbon content according to a specific mass ratio to obtain the high-aromatic-hydrocarbon-content tire rubber oil. By optimizing raw material selection and process parameters, the prepared product not only meets the requirements of environmental protection laws and regulations, but also has the characteristics of high aromatic hydrocarbon content and good compatibility with rubber, and can replace TDAE type environment-friendly tire oil which is commonly used at present.

The invention discloses a method for separating alpha olefin by adopting heat integration. The method comprises the following steps: step 1, putting a product: putting the product into a solvent tower to separate out C6 olefin; the product flowing out of the solvent tower is sequentially conveyed to a C8 tower, a C10 tower and a C12 tower through a pump body, the third step of product separation, the fourth step of cooling mechanism installation, the fifth step of product backflow and the sixth step of product recovery. According to the invention, the gas phase at the top of the separation tower for separating 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene and 1-octadecene products is respectively used as a cooling medium, and the heated solvent returns to the solvent refining tower in the cooling process to provide heat for the solvent refining tower to refine the solvent, so that the steam consumption of the solvent tower is greatly reduced; meanwhile, the consumption of cooling water at the top of the separation tower for 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene and 1-octadecene products is reduced, and the energy-saving effect is particularly obvious.

The application relates to a method for preparing siloxane by a semi-continuous homogeneous phase reaction and application, which utilizes the principle of solubilization of LiCl in THF solution to MgCl 2、 ZnCl2, regulates a reaction solvent system, and enables the whole reaction process to be carried out under the condition of a homogeneous phase solution. The method takes chlorosilane as raw material, carries out a condensation reaction in an organic solvent in the presence of metal oxide, and the organic solvent is a co-blended solvent of a weak polarity or non-polarity solvent and tetrahydrofuran. The raw material source is abundant, the method for preparing siloxane by a homogeneous phase reaction of organic chlorosilane and metal oxide is beneficial to realization of a semi-continuous process, materials are kept in a homogeneous phase process in the reaction, thereby the filtration of metal chloride salt is reduced, the reaction process period is shortened, the reaction temperature is not more than 60 DEG C, the condition is mild, the product siloxane and inorganic salt by-products such as zinc chloride and magnesium chloride are separated by distillation respectively, and the separation is fast and simple; after solvent refining, the two solvents can be reused.

The invention relates to the technical field of petrochemical engineering, in particular to a solvent refining method for producing an environment-friendly rubber plasticizer. The method comprises the following steps: taking solvent extract oil of lubricating oil as a raw material, carrying out extraction in a counter-current extraction tower by adopting a two-tower extraction process to obtain the aryl environment-friendly rubber plasticizer, mixing extract liquids at the bottoms of an extraction tower I and an extraction tower II, and recovering a solvent to obtain secondary extract oil. According to the invention, the content of polycyclic aromatic hydrocarbon in the raw material oil can be greatly reduced, and the content of environment-friendly low-cyclic aromatic hydrocarbon is reserved, so that the yield of the produced environment-friendly rubber plasticizer product is higher, and the CA value of the product is higher.

The utility model relates to the technical field of solvent refining, in particular to an impurity separation device for waste lubricating oil solvent refining, which comprises an extraction tank, a feed port connected above one side of the extraction tank, a stirring mechanism arranged in the extraction tank, an evaporation tank, a condensation tank and a material receiving box respectively arranged below the extraction tank, a liquid outlet pipe is connected below one side of the evaporation tank, and a water outlet pipe is connected below one side of the condensation tank; a jacket is arranged on the periphery of the evaporation tank, a cavity is formed between the jacket and the outer wall of the evaporation tank, and a water inlet and a water outlet are respectively formed in the front side and the rear side of the jacket; one side of the bottom of the extraction tank is communicated with one side of the upper end of the evaporation tank through a discharging pipe, a connecting pipe is connected above one side of the evaporation tank, the connecting pipe is connected with the top of the material receiving box after penetrating through the condensation box, and a spiral condensation pipe is wound on the connecting pipe in the condensation box. The device has the advantages of simple structure, good extraction effect and high efficiency.

The invention discloses a method for refining long-chain dicarboxylic acid by using a mixed solvent, which comprises the following steps: heating and dissolving a long-chain dicarboxylic acid crude product serving as a raw material in an acetonitrile-water mixed solvent, decolorizing and filtering, cooling and crystallizing, separating and washing, and dehydrating and drying to obtain a long-chain dicarboxylic acid refined product. The long-chain dicarboxylic acid product refined by the method disclosed by the invention is high in single acid purity, good in light transmittance, large in stacking density and low in solvent residue, the product quality meets the quality requirements on long-chain dicarboxylic acid in the industrial standard, and the method is suitable for industrial application.

The invention relates to the technical field of dissolving pulp, in particular to a method for preparing dissolving pulp by screening and refining bleached bamboo pulp with an alkaline eutectic solvent. Comprising the following steps: (1) firstly, performing fiber screening on slurry through a Bauer-McNett fiber screening instrument; and (2) purifying the slurry by using an alkaline eutectic solvent choline hydroxide (ChOH)-urea (UR). According to the method, impurity cells in the pulp are removed through fiber grading, then the pulp is subjected to alkaline eutectic solvent refining to remove hemicellulose in the pulp, the content of alpha-cellulose in paper pulp is increased, and the dissolving pulp with high purity is obtained. The method is mild in reaction condition, time-saving, simple and convenient to operate, the used deep eutectic solvent (DES) can be repeatedly recycled, and the process of the method is environment-friendly and clean.

The application provides a rubber plasticizer processing solvent refining equipment, and relates to the technical field of rubber plasticizer processing.The solvent refining equipment comprises a refining extraction tank body and an internal countercurrent phase combination mechanism.An extraction agent inlet end and a raw material liquid inlet end are arranged on the side wall of the tank body, and an extraction phase and a raffinate phase discharge end are arranged on the top and the bottom respectively.The countercurrent phase combination mechanism is composed of a central shaft rotating structure and a multilayer sieve plate drainage structure.The sieve plate edges are in sliding fit with the inner wall of the tank body and form alternating downflow zones and horizontal flow zones.The central shaft rotating structure drives the rotation of the micro-diameter stirring rod to avoid sieve hole blockage, and drives the axial reciprocating movement of the sieve plate through a push-pull rod to promote the dispersion of the extraction agent jet.Raw material liquid and extraction agent are in multistage countercurrent contact in the horizontal flow zone to strengthen impurity removal.The application solves the problems of low efficiency and easy blockage of traditional equipment through dynamic mixing and multistage mass transfer design, and significantly improves the refining effect of rubber plasticizer and the product purity.

The application discloses a kind of slurry method preparation polyolefin systems, including polymerization reaction unit, slurry solid-liquid separation unit, drying devolatilization unit, incondensable gas recovery unit and solvent refining unit.The application provides the system of slurry method preparation ethyl hexyl copolymer with pentane as solvent, which can be applied to large chemical industry.In the slurry solid-liquid separation unit of the application, slurry separation is carried out by pressure solid-liquid separation, polyethylene slurry from the reaction unit is directly introduced into pressure centrifuge for solid-liquid separation without cooling through heat exchanger, solvent loss is less, energy consumption can be effectively reduced, and the process is short, the number of equipment is less, which can reduce floor area.

The invention relates to the technical field of residual oil resource utilization, in particular to an inferior residual oil delayed coking, catalytic cracking and solvent refining combined process method which comprises the following steps: firstly, feeding inferior residual oil serving as a raw material into a delayed coking device for delayed coking reaction to obtain inferior coked heavy wax oil; feeding the inferior coked heavy wax oil into a catalytic cracking device, and carrying out catalytic cracking reaction on the inferior coked heavy wax oil and a catalyst to obtain catalytic cracking circulating oil; and finally, feeding the catalytic cracking circulating oil into a solvent refining device, and carrying out extraction separation on the catalytic cracking circulating oil and a solvent to obtain extracted oil and raffinate oil. According to the method provided by the invention, the low-recycle-ratio operation of the delayed coking device is realized, the liquid yield is improved, the coke yield is reduced, the processing capacity of the catalytic cracking device on high-nitrogen raw materials is also improved, and meanwhile, the aromatic hydrocarbon-rich extract oil refined by the solvent can be used as a high-quality carbon raw material.

The present invention discloses a sucralose-6-ester purification method, and particularly relates to the technical field of sucralose-6-ester purification, the method comprises: S1, crude product dissolution and adsorption refining: dissolving a crude product in a ternary complex solvent composed of isopropyl acetate, acetone and a poor solvent, and carrying out adsorption treatment by using mesoporous silica to obtain a refined filtrate, s2, programmed cooling crystallization: carrying out multi-stage programmed cooling crystallization including slow cooling crystal growing and rapid cooling crystallization on the refined filtrate, and inducing crystal precipitation, and S3, separating and drying: separating, washing and drying the obtained crystal to obtain a high-purity sucralose-6-ester product. According to the method, key impurities such as sucralose-4, 6-diester and the like are effectively removed through the synergistic effect of compound solvent refining, selective adsorption and programmed crystallization, the problem that the purity and the yield are difficult to consider at the same time is solved, the final product is high in purity and regular in crystal form, and a reliable guarantee is provided for preparation of high-quality sucralose.

The invention provides solvent refining equipment for rubber plasticizer processing, and relates to the technical field of rubber plasticizer processing, and the solvent refining equipment comprises a refining extraction tank body and an internal countercurrent combining mechanism. An extraction agent inlet end and a raw material liquid inlet end are arranged on the side wall of the tank body; an extraction phase discharge end and a raffinate phase discharge end are respectively arranged at the top and the bottom of the tank body. The countercurrent combining mechanism is composed of a middle shaft rotating structure and a multi-layer sieve plate drainage structure, and the edges of sieve plates are in sliding fit with the inner wall of the tank body to form alternately-distributed downward flow areas and advection areas. The center shaft rotating structure drives the micro-diameter stirring rod to rotate to avoid blockage of the sieve holes, and the push-pull rod drives the sieve plate to axially reciprocate to promote jet dispersion of the extraction agent. The raw material liquid and the extraction agent are in multi-stage countercurrent contact in the advection area, and impurity removal is enhanced. Through dynamic mixing and multi-stage mass transfer design, the problems that traditional equipment is low in efficiency and easy to block are solved, and the refining effect and the product purity of the rubber plasticizer are remarkably improved.

The invention relates to a method and system for producing food-grade white oil and industrial white oil by using coal tar hydrogenation tail oil, and the method comprises the following steps: S1, enabling the coal tar hydrogenation tail oil to enter a solvent refining unit for solvent refining treatment to obtain raffinate oil and extract oil; s2, H2 and the raffinate oil enter a hydro-upgrading unit to be in contact with a hydro-upgrading catalyst, hydro-upgrading reaction is carried out, a hydro-upgrading reaction product is obtained, and the hydro-upgrading catalyst comprises a hydrotreating catalyst, a hydrodewaxing catalyst and a hydrofining catalyst; s3, enabling the hydro-upgrading reaction product to enter a steam stripping unit, and performing high-pressure steam stripping to obtain a gas-phase component and a liquid-phase component; s4, enabling the liquid-phase component to enter a post-hydrogenation refining unit to be in contact with a post-hydrogenation refining catalyst, and carrying out post-hydrogenation refining reaction to obtain a post-hydrogenation refining product; s5, allowing the hydrogenated refined product to enter a separation unit for separation treatment to obtain aviation kerosene, food-grade white oil and industrial white oil.

The invention provides a process method for continuously preparing allyl alcohol from epoxypropane, and relates to the technical field of chemical synthesis. According to the process method, a feeding unit, a reaction unit, a catalyst recovery unit, a solvent recovery unit, a catalyst preparation unit, an allyl alcohol refining unit, an acquisition unit and a control unit are included, the purity and flow of a solvent output from the top of a solvent refining tower are acquired and transmitted to the control unit in real time, and according to data of the acquisition unit, the allylic alcohol is obtained. The control unit is used for controlling the feeding flow of auxiliary gas in the feeding unit and the feeding flow of a catalyst supplementing pipe in the catalyst recovery unit; the catalyst and solvent recovery unit and the solvent preparation unit are arranged, and the flow of the auxiliary gas in the feeding unit and the supplement amount of the catalyst are controlled according to the purity and flow of the solvent output by the solvent recovery unit, so that the retention time of the raw material in the reaction unit can be effectively shortened, and the generation of tar byproducts is reduced; the selectivity and stability of the catalyst are remarkably improved, and the loss rate of the solvent is reduced.