208results about "Crystallisation purification/separation" patented technology

The invention provides a method for synthesizing 1, 2-bis (4-vinyl phenyl) ethane, which comprises the following steps: adding a first solvent, methyl triphenyl phosphine halide and strong alkali into a reaction flask, and uniformly stirring to obtain a first mixed solution; heating the first mixed solution and carrying out reflux reaction for 1 hour; dropwise adding a 1, 2-bis (p-formaldehyde phenyl) ethane solution until the reflux reaction is finished to obtain a second mixed solution; reducing the temperature of the second mixed solution to room temperature, and adjusting the pH value of the second mixed solution to obtain a first solution; layering the first solution, and taking an organic layer; adding a polymerization inhibitor into the organic layer to obtain a second solution; concentrating the second solution to obtain a 1, 2-bis (4-vinyl phenyl) ethane crude product; adding a poor solvent into the crude product, stirring and crystallizing; filtering the crystal to obtain a filter cake, adding a second solvent into the filter cake, and washing and drying the filter cake to obtain 1, 2-bis (4-vinyl phenyl) ethane; the method for synthesizing the BVPE is simple and low in raw material cost, and the synthesized BVPE is high in purity and free of product isomeride.

The invention belongs to the field of photodynamic therapy, and particularly discloses a vitamin K eutectic material for photodynamic therapy and a preparation method of the vitamin K eutectic material. The vitamin K eutectic material takes vitamin K as an electron acceptor, two para-position carbonyl groups on a quinonoid six-membered ring of the vitamin K enable the vitamin K to show an electron-deficient property, and the vitamin K and the electron acceptor form an organic charge transfer compound and are self-assembled to form eutectic, so that the absorption spectrum of a system is widened, light with a wider wave band is more effectively utilized, and the utilization rate of the light is improved. The photodynamic therapy response wavelength of the vitamin K is adjusted from an ultraviolet region to a visible region and a near-infrared region, so that the problem of light damage caused by low penetration depth due to photodynamic therapy by using light in the ultraviolet region is avoided, and the vitamin K has excellent photodynamic performance and can be applied to the field of photodynamic therapy. The method has a good application prospect in surface sterilization and disinfection based on visible light or near-infrared light illumination, body surface infection treatment and directional cancer treatment.

The utility model relates to the technical field of distillation towers, in particular to a crude anthracene distillation tower, which comprises a tower body and further comprises a condensing part arranged on the outer side of the tower body and used for condensing crude anthracene, and a collecting tank arranged on the outer side of the condensing part and used for collecting condensate. The adjusting part is arranged on the outer side of the collecting tank and is used for adjusting the internal pressure of the collecting tank; a stirring part for stirring liquid and a heater for heating the liquid are arranged in the tower body; the stirring rods are used for stirring a solution at the upper part, and the inclined rods are used for stirring and mixing a solution at the lower part of the tower body, so that the solution is uniformly heated, the distillation efficiency of the liquid is improved, the discharge pipe is used for discharging distilled waste residues, and the air pump is started to form a pressure difference between the collecting tank and the tower body, so that the distilled liquid flows into the collecting tank; before entering the collecting tank, the distillation gas enters the condenser through the pipeline for condensation treatment, and the condensed liquid flows into the collecting tank through the liquid conveying pipe for collection treatment.

The invention relates to the technical field of organic photoelectric materials, in particular to a co-assembly method for improving energy transfer efficiency of chromophores, a co-assembly body and application. The specific method comprises the following steps: co-assembling a donor substance and perfluorinated aromatic hydrocarbon in a solvent system to prepare a donor-perfluorinated aromatic hydrocarbon compound; the method comprises the following steps: co-assembling an acceptor substance and perfluorinated aromatic hydrocarbon in a solvent system to prepare an acceptor-perfluorinated aromatic hydrocarbon compound; the preparation method comprises the following steps: co-assembling a donor-perfluorinated aromatic hydrocarbon compound and an acceptor-perfluorinated aromatic hydrocarbon compound in a solvent system to prepare a crystal-induced energy transfer precise co-assembly body; the donor substance is 9, 10-bis (phenylethynyl) anthracene, and the perfluorinated aromatic hydrocarbon is octafluoronaphthalene; the acceptor substance is 5, 12-bis (phenylethynyl) tetracene. The problems of high energy dissipation and low FRET efficiency of the donor-acceptor pair with weak aggregation emission in the fluorescence resonance energy transfer process are solved.

The present invention relates to a method for synthesizing small-sized organic nanocrystals using cadmium telluride quantum dots, and belongs to the field of nano synthesis technology. The method uses functionalized quantum dots as seeds to synthesize organic molecular crystals through a seed growth method, and the synthesized organic nanocrystals have uniform sizes, and the sizes are all around 30nm. The method is simple and universal, and provides a new path for accurately controlling the size of organic molecular crystals.

[Problem] To provide a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. [Solution] A method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha, the method including step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

The invention discloses a production method of polymersome, and belongs to the technical field of polymersome production. The method comprises the following steps: directly introducing a poly-linked material obtained by reacting di-tert-butyl peroxide and diisopropylbenzene in a reaction kettle into a flaker comprising an immersion tank, a rotary drum and a scraper system; washing the poly-coupled wilt material introduced into the leaching tank by using a washing medium; a cooling medium is sprayed towards the rotary drum through a spraying system, so that the washed materials are attached to the surface of the rotary drum based on the cooling effect of the cooling medium in the rotating process of the rotary drum; and the scraper system is used for scraping off the poly-mercuric chloride product attached to the surface of the rotary drum. According to the present invention, the poly-union-cake material obtained through the reaction is directly introduced into the flaker, such that the stirring precipitation process is avoided, and the step of separation through the plate-and-frame filter press or the centrifuge after the poly-union-cake material is subjected to stirring precipitation in the stirring kettle in the prior art is omitted, such that the operation is reduced, the efficiency is easily improved, the cost is easily saved, and the product yield and the product purity are high.

The invention relates to the field of oil refining and chemical engineering, and particularly provides a method and a device for producing cyclohexane by using light naphtha, the method comprises the following steps: carrying out crystallization separation on the light naphtha through a process of crystallization separation, hydrogenation reaction and gas-liquid separation to obtain high-purity cyclohexane; the residual light naphtha is subjected to hydrogenation reaction, and the yield of cyclohexane is increased through C6 alkane cyclization, methyl cyclopentane isomerization, saturation of a small amount of benzene and other reactions; and the cyclohexane-rich fraction of the reaction product is subjected to crystallization separation through a stable part to be further recovered, and the cyclohexane is concentrated. According to the method for producing cyclohexane by using light naphtha disclosed by the invention, the purity and recovery rate of obtained cyclohexane are high, the operation energy consumption in the cyclohexane production process is reduced, the occupied area of the device is small, the investment is saved, the operation is flexible, related equipment and pipelines are not easy to block, and long-period stable operation can be realized.

The invention relates to the technical field of chemical separation and purification, and discloses a method for separation and purification of taxadiene from tobacco and GC-MSMS quantitative detection.The method for separation and purification of taxadiene from tobacco comprises the following steps that S1, tobacco leaves are made into powder, an extracting agent is added, ultrasonic extraction is conducted for multiple times, and extract liquor is obtained; s2, evaporating the extract to dryness, adding an organic solvent, and dissolving to form a concentrated solution; s3, the concentrated solution is added into a silica gel column for gradient elution, and an extraction sample is obtained; and S4, evaporating the extracted sample to dryness, adding acetonitrile for dissolving, and carrying out secondary recrystallization to obtain purified taxadiene. According to the method, the efficiency and purity of separating the taxadiene from the tobacco are improved, and the taxadiene is accurately quantified.

The invention provides a p-xylene crystallization tower. The p-xylene crystallization tower comprises a tower body, a cooling structure and a scraper structure, mixed xylene is contained in the tower body; the cooling structure comprises a sealing plate and liquid conveying pipes arranged at the upper end and the lower end of the sealing plate respectively, and the sealing plate surrounds the periphery of the tower body; the sealing plate is wavy; the sealing plate comprises a plurality of wave trough parts and a plurality of wave crest parts which are alternately arranged, the wave trough parts are tightly connected with the periphery of the tower body, and the sealing plate and the periphery of the tower body define a circulation channel extending in the vertical direction between any two adjacent wave trough parts; the liquid conveying pipes are arranged on the periphery of the tower body in a surrounding mode, and the two liquid conveying pipes communicate with the multiple circulation channels correspondingly. And the refrigerating medium is input into the circulation channel through the liquid conveying pipe. And the mixed xylene is cooled under the action of the refrigerating medium, and paraxylene is crystallized and separated out on the inner circumferential wall of the tower body. And the scraper structure scrapes crystals on the tower body. According to the p-xylene crystallization tower, a refrigerating medium is in close contact with the tower body, so that the dissipation of cold energy is effectively reduced, and the refrigerating effect is improved.

The invention discloses a method for synthesizing 1, 2-bis (4-vinylphenyl) ethane, which comprises the following steps: S1, under the protection of nitrogen, taking 4-vinylbenzyl chloride as a solvent and a reactant, and reacting in the presence of iodine, magnesium metal and ethylene glycol diethyl ether to generate the 1, 2-bis (4-vinylphenyl) ethane; s2, after the reaction is finished, heating, and filtering to remove magnesium chloride while the solution is hot; and S3, cooling and crystallizing to separate out the product 1, 2-bis (4-vinyl phenyl) ethane, and filtering and separating the product to obtain mother liquor which can be directly used for synthesizing the 1, 2-bis (4-vinyl phenyl) ethane. The method has the beneficial effects that the solubility of the product 1, 2-bis (4-vinylphenyl) ethane in 4-vinylbenzyl chloride can be effectively adjusted by introducing the additive ethylene glycol diethyl ether (EGDE), magnesium chloride can be removed by directly heating and filtering while the solution is hot after the reaction, then the product can be obtained by cooling and crystallizing the mother liquor, the process of the method is shorter than that of the existing method, a washing step is omitted, and the method is suitable for industrial production. And subsequent magnesium sulfate mother liquor drying and harsh solvent dehydration steps are avoided.

This invention discloses a method for controlling photon spin-orbit coupling in an organic alloy microcavity, belonging to the field of optical microcavity technology. This invention prepares β-type Pe by doping different amounts of DCA into Pe using a volatilization method. 1‑x DCA x An organic alloy, wherein x ≤ 20 wt%, allows for the controllability of crystal color from yellow-green to orange-red. Furthermore, this organic alloy exhibits birefringence, and its application in the fabrication of optical microcavities allows for the observation of TE-TM spin-orbit coupling and Rashba-Dresselhaus spin-orbit coupling within the microcavities. This provides a novel type of microcavity for studying the interaction between light and matter in organic alloy microcavities, and the controllability of photon spin-orbit coupling within these microcavities can be achieved by adjusting the value of x.

The present invention relates to the technical field of polycyclic aromatic hydrocarbon separation, and provides a polycyclic aromatic hydrocarbon separation method. In the present invention, firstly, a mixed solvent and a mixture to be separated are mixed and then filtered to obtain a filter cake and a filtrate, then a back-extractant and the filtrate are mixed and then separated, wherein the mixed solvent is a naphthyl mixed solvent or an imidazole mixed solvent, and the mixture to be separated is a mixture containing a bicyclic aromatic hydrocarbon and a tricyclic aromatic hydrocarbon or a mixture containing a tricyclic aromatic hydrocarbon and a tetracyclic aromatic hydrocarbon. According to the present invention, the mixture containing the bicyclic aromatic hydrocarbon and the tricyclic aromatic hydrocarbon is separated by using the naphthyl mixed solvent, the mixture containing the tricyclic aromatic hydrocarbon and the tetracyclic aromatic hydrocarbon is separated by using the imidazole mixed solvent, and the naphthyl mixed solvent or the imidazole mixed solvent can be recycled. Additionally, the separation method provided by the present invention has simple steps, low energy consumption and a simple technological process.

The invention relates to the technical field of alkyl anthracene production, and discloses a separation method of an anthracene alkylation reaction product, which comprises the following steps: pretreating the anthracene alkylation reaction product to remove part of anthracene; mixing the pretreated product with an entrainer, and rectifying at the temperature of 100-250 DEG C and the pressure of 1-120 kPa to obtain a light component I and a heavy component I; the light component I contains an azeotrope of a reaction solvent and an entrainer in the anthracene alkylation reaction product; the heavy component I is rectified at the temperature of 100-300 DEG C and the pressure of 0.5-100 kPa, and a light component II and a heavy component II are obtained; the light component II contains an azeotrope of anthracene and an entrainer; and carrying out cooling crystallization on the heavy component II, and carrying out solid-liquid separation to obtain alkyl anthracene. By adopting the separation method provided by the invention, the system can stably operate for a long time, and meanwhile, higher yield and purity of anthracene and alkyl anthracene can be realized.

The crystallization purification preparation system for 2, 6-dimethylnaphthalene comprises a suspension stirring crystallizer and a crystal filter, the suspension stirring crystallizer is connected to one end of the crystal filter, and the other end of the crystal filter is connected with a residual liquid tank and a static crystallizer; a mother liquid tank and a finished product tank are arranged on the first pipeline between the static crystallizer and the crystal filter; meanwhile, the residual liquid tank, the mother liquid tank and the static crystallizer are also respectively connected with a waste removal and discharge pipeline; wherein the suspension stirring crystallizer is connected with a cooling and heating all-in-one machine through a cooling and heating medium pipeline, and the static crystallizer is also connected with the cooling and heating all-in-one machine through the cooling and heating medium pipeline. According to the method, high-purity 2, 6-dimethylnaphthalene is obtained from low-value petrochemical raw materials by adopting a crystallization purification method.

The invention discloses a two-dimensional organic transverse heterogeneous crystal and a preparation method and application thereof.According to the preparation method, a step-by-step micro-spacing air sublimation method is adopted, the growth temperature of a secondary crystal is precisely regulated, effective control over the molecular diffusion and deposition process is achieved, and the yield of the two-dimensional organic transverse heterogeneous crystal is improved. And the two-dimensional organic transverse heterogeneous crystal with the adjustable epitaxial layer thickness can be simply and conveniently prepared. According to the invention, unique optical characteristics of the two single-component crystals are fully utilized, and optical signal emission of different wavebands can be realized at different polarization angles. By means of the characteristic, the wide application potential is achieved in the fields of optical sensing, optical communication and the like, and the requirement for diversity of optical signal wavebands can be met.

The utility model relates to recovery device technical field, concretely is a kind of benzene recovery device, including waste oil buffer tank, waste oil buffer tank is connected with the top of crude benzene crystallization tank by pipeline, the bottom of crude benzene crystallization tank is connected with the top of fine benzene rectifying column by pipeline one, and cooling pipe is wound in side portion, and cooling pipe is connected with freezer;Pipeline one is provided with feed pump;The top of fine benzene rectifying column is connected with fine benzene condenser by pipeline, and bottom is connected with heavy residue discharge pipe;Fine benzene condenser is connected with fine benzene buffer tank by pipeline two;The utility model is through being provided with crude benzene crystallization tank and fine benzene rectifying column, first crystallization comes out crude benzene, and then distills crude benzene, and the fine benzene of distillation comes out, to realize the extraction and recovery of benzene, avoid the waste of resources, reduce cost.

The present invention relates to a process for recycling polystyrene waste containing at least one organic halogen containing compound by converting polystyrene to styrene comprising the steps of: a) providing a melt of polystyrene waste containing at least one organic halogen containing compound, b) subjecting the melt provided in step a) to at least one devolatilization step so as to obtain a devolatilized composition, c) subjecting the devolatilized composition obtained in step b) to at least one pyrolysis step so as to obtain a pyrolyzed composition, d) subjecting the pyrolyzed composition to at least one distillation step so as to obtain a purified styrene composition.

The application provides a method for preparing beta-methylnaphthalene from a methylnaphthalene-containing fraction based on solution homogenization crystallization separation, and comprises the following steps: pumping the methylnaphthalene-containing fraction into a fluidized bed reactor, performing primary cooling treatment, and performing ultrasonic treatment through an ultrasonic device arranged on the inner wall of the fluidized bed reactor, and then filtering after the crystallization treatment; re-heating the solid in the fluidized bed reactor, then performing secondary cooling treatment and ultrasonic treatment at the same time, and then filtering after the crystallization treatment; re-heating the solid in the fluidized bed reactor, then performing third cooling treatment, and performing ultrasonic treatment at the same time, and then filtering after the crystallization treatment, collecting the filter residue, and then drying to obtain high-purity beta-methylnaphthalene. The method combines the fluidized bed reactor with the ultrasonic treatment technology, and adopts step-by-step crystallization, so that impurities are effectively removed, high-purity beta-methylnaphthalene is obtained, and the yield of the product is obviously improved.

Disclosed are apparatuses and processes for preparation and conversion comprising / using: a fractionation chain (4-6) that produces a xylene fraction (24); a xylene separation unit (10) that treats the xylene fraction to produce a para-xylene extract (39) and a raffinate (40); an isomerization unit (11) treating the raffinate to produce an isomerization product (42) of xylenes fed to the fractionation chain; the synthesis gas production unit (14; 15) that treats the hydrocarbon feedstock (30) to produce a synthesis gas (34) containing CO and CO2; a methanol synthesis reaction section (50) that treats the synthesis gas (34) to produce methanol (51); a toluene alkylation reaction section (13) treating the toluene-containing fraction (23) with methanol (51) to produce an alkylation effluent (32) containing xylene and fed to the fractionation chain.

The invention belongs to the technical field of photothermal conversion materials, and discloses a preparation method and application of an inorganic-organic hybrid polyoxotungstate photothermal material with wide spectrum absorption. The structural formula of the photo-thermal material is Per4W10O32, the crystal structure belongs to a triclinic system, the space group is P-1, and the photo-thermal material has specific unit cell parameters. The preparation method comprises the following steps: oxidizing perylene molecules through constant current electrolysis in a mixed solvent system containing perylene molecules and a decatungstate precursor in an electrochemical oxidation manner, and assembling the oxidized perylene molecules with decatungstate anions to form bulk crystals; the photo-thermal material has continuous strong absorption in a region from ultraviolet light to short wave infrared, the photo-thermal conversion efficiency is as high as 98.24%, when the photo-thermal material is applied to the fields of solar driven interface photo-thermal evaporation and water treatment, the evaporation rate of a two-dimensional system is 1.89 kg.m <-2 >. H <-1 >, the evaporation rate of a three-dimensional hydrogel system is increased to 3.02 kg.m <-2 >. H <-1 >, salt deposition can be inhibited in long-term seawater desalination operation, and the photo-thermal material has a good application prospect. Fresh water quality meets drinking water standards.

The present application relates to the field of basic organic chemistry synthesis, and particularly to a high-yield preparation method of o-terphenyl based on hydrogen participation; comprising the steps of preparing a catalyst mixed solution, preparing a reaction mixed solution, filling micro-pressure hydrogen, heating and hydrogenation coupling reaction, rough extraction through reduced pressure distillation, and recrystallization and drying; a pre-assembly reaction precursor is formed by a bidentate phosphine bidentate phosphine ligand and a supported palladium catalyst, and a coupling reaction occurs with diphenyl under the cooperation of micro-pressure hydrogen and an acidic cocatalyst; the present application does not need to use traditional halogenated aromatic hydrocarbons and organic metal reagents, solves the problems of isomer mixing and difficult separation and halogen residue affecting the performance of downstream optoelectronic materials, realizes the preparation of o-terphenyl, and simplifies the separation and purification process.

The invention provides a multi-stage washing production process of high-concentration p-xylene, which comprises the following steps: cooling and crystallizing a raw material under a first temperature condition to obtain first crystal mush; carrying out solid-liquid separation on the first crystal mush, washing raw materials and part of products to obtain first crystals, first filtered mother liquor and first eluate, and melting the first crystals to obtain a first p-xylene product; sending part of the first filtered mother liquor to a second temperature condition for cooling crystallization to obtain second crystal mush; repeating the steps on the second crystal mush to obtain a second p-xylene product; and cooling and crystallizing part of the second filtered mother liquor under a third temperature condition to obtain third crystal mush, and repeating the steps on the third crystal mush to obtain a third p-xylene product. The problems that the crystal transfer amount is large and difficult and the crystal particle circulation amount is large during p-xylene production can be solved.

This invention provides a method for purifying mesitylene through suspension melt crystallization, belonging to the field of fine chemical separation technology. By adding a crystallization aid to assist in the suspension melt crystallization of mesitylene, this invention overcomes the limitations of traditional crystallization separation. The addition of the crystallization aid interacts with impurities in the crude product, effectively altering the crystallization behavior of the impurities and inhibiting their entry into the mesitylene lattice during crystal growth. This reduces the amount of impurities trapped during mesitylene crystallization, accelerates the crystallization process, and reduces the number of multi-stage crystallization. Without altering the main molecular configuration of mesitylene, this invention achieves highly efficient separation and purification of mesitylene, significantly improving its purity and yield. It solves the problem of isomer separation and overcomes the technical bottleneck of low efficiency in the existing mesitylene purification and separation process.

The utility model relates to the technical field of naphthalene water separation, in particular to industrial naphthalene water separation and recovery equipment which comprises a condensation kettle and a bottom plate, a collecting barrel is placed at the upper end of the bottom plate, a discharging valve pipe is connected to the lower side of the condensation kettle in a penetrating mode, an inner threaded cover is fixedly connected to the outer wall of the discharging valve pipe, and a threaded ring is connected to the inner wall of the inner threaded cover in a threaded mode. The lower end of the threaded ring is fixedly connected with a collecting net barrel, and a bearing barrel is arranged on the outer side of the collecting net barrel. The solid naphthalene and the water in the condensation kettle enter the collecting net barrel, the solid naphthalene can be further isolated in the collecting net barrel, and the water falls into the receiving barrel through the meshes and flows into the collecting barrel, so that the solid naphthalene and the water can be collected through the collecting net barrel and the collecting barrel respectively, and after collection is completed, the solid naphthalene and the water are separated from each other. And the receiving barrel and the collecting net barrel can be taken down in opposite steps, so that the solid naphthalene and the water can be conveniently separated and recycled during discharging, and the purpose of improving the operation simplicity is further achieved.

The application provides a crystallization method of refined fluorene, which comprises the following steps: adding a raw material fluorene fraction into a mixed solution, carrying out a first beating and washing at normal temperature, and obtaining crude fluorene through centrifugal separation; mixing the crude fluorene with a solvent A, stirring and heating to 65-85 DEG C, cooling to 5-30 DEG C after the solid part is dissolved, keeping the temperature for 1 h, and obtaining industrial fluorene through centrifugal separation, and the mother liquor is used as a washing agent to participate in the first beating and washing. The method has simple and easy-to-control operation conditions and low cost. Through reducing the high-temperature operation time, using a high-boiling and low-volatility solvent to reduce the solvent loss in the crystallization process, using a single solvent to facilitate solvent recovery, using the mother liquor in the process to increase the yield and reduce the solvent consumption, using the beating and washing mode in the first step operation to operate at normal temperature, reducing the energy consumption and shortening the process cycle, and cooling and crystallizing in the second step operation, the crystal part is dissolved, the remaining solid is used as a crystal seed, so that the crystallization process is controllable, the primary burst nucleation is avoided, and the walling condition is reduced.

A method for producing para-xylene (PX) includes introducing a C8 aromatic-containing composition to a xylene rerun column to separate the C8 aromatic-containing composition into a xylene-containing effluent and a heavy effluent and passing the xylene-containing effluent to a PX processing loop that includes a PX recovery unit operable to separate PX from the xylene-containing effluent, a membrane isomerization unit operable to convert a portion of the MX, OX, or both to PX, an EB dealkylation unit operable to dealkylate EB to produce benzene, toluene, and other C7- compounds, and a membrane separation unit operable to produce a permeate that is PX-rich and a retentate that is PX-lean. The permeate is passed to the PX recovery unit for recovery of PX, which the retentate is bypassed around the PX recovery unit circulated through the xylene processing loop.

The present application relates to a kind of device and method for extracting high-purity chemicals from coal tar wash oil fraction, comprising: naphthalene separation column, methylnaphthalene separation unit, acenaphthene-fluorene-dibenzofuran separation unit;Methylnaphthalene separation unit includes methylnaphthalene separation tower, β-methylnaphthalene subunit and α-methylnaphthalene subunit connected in sequence;Acenaphthene-fluorene-dibenzofuran separation unit includes light removal tower, acenaphthene subunit, dibenzofuran subunit and fluorene subunit connected in sequence;The material outlet of the bottom of naphthalene separation column is connected with methylnaphthalene separation tower;The material outlet of the bottom of methylnaphthalene separation tower is connected with the material inlet of light removal tower.The device provided by the present application can effectively extract target chemicals in coal tar wash oil fraction by reasonable configuration of the device and coupling cooperation between devices, and obtain high-purity products.Compared with existing wash oil extraction chemical technology, it has higher efficiency, wider applicability and better product quality.

The invention relates to the technical field of production of 2, 6-dimethylnaphthalene, and discloses a production method and a production system of 2, 6-dimethylnaphthalene, and the production method comprises the following steps: (1) under a liquid phase condition, in the presence of an alkyl transfer catalyst, contacting reaction raw materials with a transfer alkylating agent to obtain a product mixture; the content of the 2, 6-dimethylnaphthalene is not less than 15wt% on the basis of the total content of the bicyclic aromatic hydrocarbon in the product mixture; (2) rectifying the product mixture to obtain a light component and a heavy component containing the dimethylnaphthalene isomer, and returning the light component to the step (1) to provide at least part of reaction raw materials; (3) mixing the heavy component obtained by rectification with a complexing agent, carrying out complexing crystallization, and then carrying out alkali washing to obtain a 2, 6-dimethylnaphthalene crude product; and (4) mixing the 2, 6-dimethylnaphthalene crude product with a solvent, and recrystallizing. The method has the advantages of high purity and high yield of the 2, 6-dimethylnaphthalene.

The present invention belongs to the field of petroleum refining and chemical industry, and specifically relates to a system and method for separating ethylbenzene from C8 aromatics. The system comprises: a refrigeration system, a cryogenic separation system, and a heating system; the cryogenic separation system comprises a number ≥1 cryogenic separation unit; the cryogenic separation unit comprises a number ≥1 cryogenic separator, and a cold exchange component and an agitator are arranged inside the cryogenic separator. The system and method for separating ethylbenzene from C8 aromatics disclosed in the present invention have high purity and recovery rate of ethylbenzene, reduce the operating energy consumption of the ethylbenzene production process, are flexible in device operation, and are not easy to be blocked in the device equipment and pipelines, and can achieve long-term stable operation.