155 results about "Methylated naphthalene" patented technology

Provided herein are polymorphs and crystalline forms of 2-fluoro-5-((5S,5aS,6S,9R)-1-fluoro-12-(((2R,7aS)-2-fluorotetrahydro-1H-pyrrolizin-7a(5H)-yl)methoxy)-5-methyl-5a,6,7,8,9,10-hexahydro-5H-4-oxa-3,10a,11,13,14-pentaaza-6,9-methanonaphtho[1,8-ab]heptalen-2-yl)-3-methyl-4-(trifluoromethyl)aniline (Compound of Formula (I)), pharmaceutical compositions thereof, and methods of their use, for example, in the treatment of cancer. Also provided herein are synthetic processes for the manufacture of a compound of Formula (I) (i.e., 2-fluoro-5-((5S,5aS,6S,9R)-1-fluoro-12-(((2R,7aS)-2-fluorotetrahydro-1H-pyrrolizin-7a(5H)-yl)methoxy)-5-methyl-5a,6,7,8,9,10-hexahydro-5H-4-oxa-3,10a,11,13,14-pentaaza-6,9-methanonaphtho[1,8-ab]heptalen-2-yl)-3-methyl-4-(trifluoromethyl)aniline). Also provided are compounds useful in its synthesis (e.g., those of Formulae (A), (B), (By), and (H)) and synthetic processes directed thereto.

The invention discloses a preparation method of a branched epoxy resin pressure-bearing plugging material and an oil-based drilling fluid. The pressure-bearing plugging material has a branched structure and is characterized in that the raw materials of the material include: tetrahalogenated phenyls, tetrahalogenated naphthalenes, epichlorohydrin, hexagonal boron nitride, and a silane coupling agent, and the molar ratio of the tetrahalogenated phenyls, 2,3,6,7-tetrachloromethyl-1,4,5,8-tetramethylnaphthalene, and epichlorohydrin is approximately (1-2): (1-2): 4. The synthesized branched epoxy resin polymer is combined with a modified hexagonal boron nitride with a hydroxyl carboxyl group on the surface by using a silane coupling agent, and the pressure bearing capacity of the final product branched epoxy resin pressure-bearing plugging material can reach 150-180MPa, and the compressive strength is 2-3 times that of a traditional epoxy resin plugging material. The material is applied to an oil-based drilling fluid to enhance the plugging performance of the drilling fluid.

The invention discloses a composite material and application thereof in electrochemical carbon dioxide capture, and belongs to the technical field of electrochemistry and carbon dioxide capture. The composite material provided by the invention comprises a carbon felt and a 1, 4-naphthoquinone compound, the 1, 4-naphthoquinone compound is loaded on the carbon felt; the 1, 4-naphthoquinone compound comprises at least one of 1, 4-naphthoquinone, 2-methyl-1, 4-naphthoquinone or 2, 3-dimethyl-1, 4-naphthoquinone, and the compound is a compound of the 1, 4-naphthoquinone, the 2-methyl-1, 4-naphthoquinone and the 2, 3-dimethyl-1, 4-naphthoquinone. In the composite material disclosed by the invention, a 1, 4-naphthoquinone structure of the 1, 4-naphthoquinone compound can realize specific capture of CO2 through a reversible oxidation-reduction reaction, a carbon felt three-dimensional porous framework provides a smooth channel for CO2 mass transfer and electron transmission, and the 1, 4-naphthoquinone structure and the carbon felt three-dimensional porous framework cooperate with each other to solve the problems of low capture capacity, poor stability and high energy consumption of a traditional carbon material; therefore, the method has a good application prospect in electrochemical carbon dioxide capture.

The invention relates to the field of immersed coolants, and discloses a low-density high-thermal-conductivity composite silicone oil coolant and a preparation method thereof, the method comprises preparation of naphthyl-terminated aryl silicone oil and application of the naphthyl-terminated aryl silicone oil to a base liquid of the silicone oil coolant, and the thermal conductivity of the silicone oil coolant is improved. Dissolving dimethyldichlorosilane in tetrahydrofuran, dropwise adding a naphthalene Grignard reagent into the mixed solution, and after the reaction is finished, carrying out quenching, extraction and other processes to obtain dimethylnaphthalene aryl chlorosilane; adding a potassium carbonate solution into the dimethyl naphthyl aryl chlorosilane, and extracting after reaction to obtain dimethyl-naphthyl siloxane alcohol; adding a tin catalyst into the dimethyl-naphthyl siloxane alcohol, carrying out vacuum reaction, rectifying and purifying to obtain tetramethyl dinaphthyl disiloxane; the naphthyl-terminated aryl silicone oil is prepared by taking DMC as a raw material, KOH potassium as a catalyst and tetramethyl dinaphthyl disiloxane as an end capping agent. The composite silicone oil cooling liquid with low density, high specific heat capacity and stable structure is prepared by stirring, mixing and compounding.

The invention discloses an ultra-pure coal preparation method based on a catalytic hot-melt extraction method. The method comprises the following steps: (1) grinding a coal sample to obtain coal powder; (2) uniformly mixing the pyrite catalyst with pulverized coal to obtain a coal / catalyst mixture; (3) mixing the coal / catalyst mixture with a composite extraction solvent, and extracting; wherein the composite extraction solvent comprises methylnaphthalene oil and methanol; (4) carrying out solid-liquid separation on the extracted product to respectively obtain extraction residues and extraction liquid; and (5) distilling to remove the extraction solvent in the extraction liquid, and cleaning the obtained solid product to obtain the ultra-pure coal. Through cooperation of catalysis and hot melting extraction, the extraction effect is good, and the yield of the ultra-pure coal is high.

The invention discloses a compound dispersing agent, a mixed electroplating solution and application, the compound dispersing agent comprises a first anionic surfactant, a second anionic surfactant and a nonionic surfactant, and the first anionic surfactant comprises a sulfonate compound; and / or the second anionic surfactant comprises one or more of betaine or carboxylate; and / or the nonionic surfactant comprises one or more of a naphthoquinone sulfonate formaldehyde condensation compound, a melamine-formaldehyde condensation compound and methylnaphthalene sulfonic acid formaldehyde condensation compound sodium salt. In the compound dispersant, the first anionic surfactant plays a role in surface wetting and dispersing, the second anionic surfactant plays a role in main dispersing, and the nonionic surfactant plays a role in surface active wetting, so that the compound dispersant disclosed by the invention has good synergism; the graphene dispersing agent plays a role in dispersing graphene in a plating solution system, plays a certain positive role in ion migration in the plating solution, and does not cause poisoning harm to the plating solution.

The invention provides a method for preparing alkyl naphthalene by using a metal organic framework as a catalyst and application of the alkyl naphthalene. The method comprises the following step: in the presence of a metal organic framework catalyst, alpha-olefin and naphthalene and / or methylnaphthalene are subjected to an alkylation reaction to obtain alkyl naphthalene. The invention also provides application of the alkyl naphthalene prepared by the method for preparing the alkyl naphthalene by using the metal organic framework as the catalyst as base oil of V-type lubricating oil. The alkyl naphthalene is prepared by adopting the MOFs catalyst, the catalyst has large pore channels, and the catalyst is high in catalytic activity, long in service life, free of pollution and not prone to corroding equipment in the preparation process of the alkyl naphthalene.

The invention provides a method for separating 2-methyl-6-propionyl naphthalene through melt crystallization, which comprises the following steps: reacting 2-methylnaphthalene with propionic anhydride under the action of a catalyst to obtain a 2-methyl-propionyl naphthalene mixture; the 2-methyl-propionyl naphthalene mixture is distilled, and a 2-methyl-propionyl naphthalene crude product is obtained; and carrying out melt crystallization on the 2-methyl-acyl naphthalene crude product to obtain the 2-methyl-6-propionyl naphthalene. According to the method for separating the 2-methyl-6-propionyl naphthalene through melt crystallization, after the crude product of the 2-methyl-6-propionyl naphthalene is obtained through distillation and purification, the high-purity 2-methyl-6-propionyl naphthalene can be obtained through a melt crystallization one-step method. The method has the advantages of simple process operation, high separation efficiency, low energy consumption, high product purity and the like.

The invention belongs to the technical field of polyester industrial yarns, and relates to branched antibacterial polyester as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, controlling the carboxyl of first polyethylene glycol terephthalate to react with the epoxy group of glycidyl ether oxypropyl polyhedral oligomeric silsesquioxane to generate branched polyester, then controlling the hydroxyl of the branched polyester to react with the hydroxyl of 8-[(4-aminophenyl) azo]-7-hydroxyl-N, N, N-trimethyl-2-naphthalene quaternary ammonium hydrochloride to generate branched polyester, and finally controlling the hydroxyl of the branched polyester to react with the hydroxyl of 8-[(4-aminophenyl) azo]-7-hydroxyl-N, N, N-trimethyl-2-naphthalene quaternary ammonium hydrochloride to generate branched polyester. The branched antibacterial polyester is obtained. According to the application, the branched antibacterial polyester and second polyethylene glycol terephthalate are subjected to melt blending spinning, and the antibacterial polyester industrial yarn is prepared. The branched antibacterial polyester is easier to enrich on the fiber surface layer of the polyester industrial yarn, the antibacterial performance of the polyester industrial yarn is improved, meanwhile, the polyester industrial yarn can keep good mechanical performance, and the branched antibacterial polyester is suitable for large-scale industrial application.

The invention provides a methylnaphthalene alkylation catalyst as well as a preparation method and application thereof. The methylnaphthalene alkylation catalyst is obtained by carrying out variable-pressure hydrothermal aging and acid pickling on an HMCM-22 molecular sieve; the external specific surface area of the methylnaphthalene alkylation catalyst is 100-140 m < 2 > / g, and the mesoporous volume is 0.8-1.5 cm < 3 > / g; the strong acid center at the temperature of 370-485 DEG C accounts for 80-90% of the weak acid center at the temperature of 200-350 DEG C; the total acid amount is 0.5 to 1.9 [mu] mol / NH3. The methylnaphthalene alkylation catalyst has good stability on the premise of ensuring high activity, is used for catalyzing alkylation of 2-methylnaphthalene and methanol to prepare 2, 6-dimethylnaphthalene, and has good selectivity on DMN and 2, 6-DMN.

The invention relates to a method for synthesizing menadione through in-tank indirect electrooxidation of 2-methylnaphthalene. Metal titanium is used as a substrate, a Sn-Ir-doped titanium-based PbO2 electrode is prepared by adopting a coating method and is used as an electrolytic anode, and a Pb electrode is used as a cathode. 2-methylnaphthalene, a solvent, cobaltous sulfate, sulfuric acid, ammonium sulfate, an electrocatalyst and water are prepared into anolyte according to a certain proportion, a sulfuric acid aqueous solution serves as catholyte, an oil-water two-phase reaction solution is obtained from an anode in a two-phase electrolysis mode, an oil phase is directly refined to obtain menadione, and a water phase is reused after being refined. The method is short in technological process, few in three wastes, mild in condition and extremely low in cost, and has extremely high industrialization prospects.

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.

The present disclosure provides compounds, compositions, and methods for reducing or preventing fouling in an industrial processes. A compound or composition may include a methylnaphthalene sulfonate-formaldehyde polymer and / or a sulfonated dispersant. An industrial process may include, for example, a chemical manufacturing process, such as an acrylonitrile manufacturing process. The disclosure also provides methods of manufacturing the compounds and compositions disclosed herein.

The invention provides a methylnaphthalene alkylation catalyst as well as a preparation method and application thereof. The preparation method of the methylnaphthalene alkylation catalyst comprises the following steps: carrying out hydrothermal aging on an HMCM-22 molecular sieve; the HMCM-22 molecular sieve subjected to hydrothermal aging is placed in acid liquor for acid treatment, and the methylnaphthalene alkylation catalyst is obtained. The invention also provides the catalyst prepared by the method and a method for preparing 2, 6-dimethylnaphthalene by alkylation of 2-methylnaphthalene and methanol based on the catalyst. On the premise of ensuring high activity and high stability, the HMCM-22 molecular sieve provided by the invention also has good selectivity on dimethylnaphthalene and 2, 6-dimethylnaphthalene.

The invention discloses a method for directly preparing a racemic oxidation product from a fennerenone enantiomer through photocatalysis, and belongs to the technical field of organic synthesis.The method comprises the steps that an R-type fennerenone isomer is taken to be placed in a reaction bottle, a photosensitizer containing iridium or ruthenium is added, and a solvent is added at the speed of 0.1 M in the air atmosphere; the method comprises the following steps: dissolving 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide in a solvent, stirring, transferring a mixture into a photoreactor of a blue light LED (Light Emitting Diode) with the wavelength of 455-465 nm, stirring, transferring a mixed solution after the reaction is finished into a round-bottom flask, purifying a volatile solvent to obtain a product 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, and carrying out chiral HPLC (High Performance Liquid Chromatography) analysis on the product. High temperature, high pressure or a strong oxidant is not needed, and reaction conditions are mild; oxygen in air is oxidized at room temperature, so that energy consumption and pollutant generation are reduced; compared with the traditional oxidation condition, the method does not need to undergo the process of oxidation first and then high-temperature induced racemization, and the racemization product can be directly obtained.

The invention relates to a synthesis method of 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, which comprises the following four steps: carrying out a Knoevenagel condensation reaction, carrying out a Hantzsch dihydropyridine synthesis method, carrying out an O-ethylation reaction and carrying out a deprotection reaction to synthesize the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, and carrying out a reaction to obtain the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide. The preparation method of the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide has the advantages that the selectivity is high, the post-treatment is simple, the yield and the purity of the product are high, a new synthesis route and method are developed for synthesizing the 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-1, 4-dihydro-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, the amplified production is conveniently realized, and the method is suitable for industrial production. The method has good application potential and research value.

The invention discloses a preparation method of a low-pore-number composite lining, and belongs to the technical field of textiles. The preparation method of the low-hole-number composite lining comprises the following steps: (1) weaving polyester yarns into gray fabric; (2) shaping and preshrinking the gray fabric; (3) dyeing the set and pre-shrunk gray fabric; (4) shaping and finishing the dyed gray fabric to obtain a composite lining; wherein the dye for dyeing is obtained by reacting N-amino-4-N, N-dimethyl-1, 8-naphthalimide with ferrocene dicarboxaldehyde, and the dye for dyeing is obtained by reacting N-amino-4-N, N-dimethyl-1, 8-naphthalimide with ferrocene The setting agent for setting and finishing contains a hydrophilic softening agent, the hydrophilic softening agent is obtained by mixing polyether phenyl silicone oil with a compound emulsifier and deionized water, and the polyether phenyl silicone oil is obtained by reacting side chain hydrogen-containing silicone oil, allyl alcohol polyoxyalkyl ether, vinyltriethoxysilane and 1-(4-vinyl-phenyl)-ethanone; the prepared low-hole-number composite lining is good in hydrophilicity, color fastness and softness.

The embodiment of the invention provides an alkyl naphthalene sulfonate antirust agent produced through methylnaphthalene alkylation, and relates to the technical field of synthesis of petroleum sulfonate antirust agents. A method for producing an alkyl naphthalene sulfonate antirust agent through methylnaphthalene alkylation comprises the following steps: adding high-purity methylnaphthalene into a reaction kettle, adding a Lewis acid catalyst, uniformly stirring and mixing, slowly adding C9-C12 olefin into a reaction system in a dropwise adding manner under a stirring condition, dropwise adding for 30 minutes to 2 hours, and after the dropwise adding is finished, cooling to room temperature to obtain the alkyl naphthalene sulfonate antirust agent. After the dropwise adding is finished, continuously keeping the temperature, stirring and reacting for 2-4 hours, and cooling to room temperature after the reaction is finished, so as to obtain a reaction mixture containing alkyl naphthalene. The alkyl naphthalene sulfonate with clear components, high purity and excellent anti-rust performance is prepared by optimizing the molar ratio and reaction conditions of methylnaphthalene and olefin and combining an efficient purification process, green and efficient preparation of the anionic surfactant with controllable raw materials and stable quality is realized, and the method has a good industrial application prospect.

The invention provides a naphthalene aromatic hydrocarbon alkylation catalyst as well as a preparation method and application thereof. The naphthalene aromatic hydrocarbon alkylation catalyst is an MCM-22 molecular sieve loaded with a metal element, and the naphthalene aromatic hydrocarbon alkylation catalyst contains 0.1-4.0% of the metal element based on 100% of the mass of the naphthalene aromatic hydrocarbon alkylation catalyst; the metal elements comprise one or a combination of more than two of Fe, Co, Ni, Cu, Zn and Cr. The naphthalene aromatic hydrocarbon alkylation catalyst can be used for converting carbon monoxide and / or carbon dioxide into 2, 6-dimethylnaphthalene with high added value, and has the advantages of short process route, environmental protection, low carbon, high conversion rate of carbon monoxide and / or carbon dioxide, high alkylation rate of naphthalene aromatic hydrocarbon and high long-period stability.

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 invention relates to the technical field of catalysts, and discloses a transalkylation catalyst and a preparation method thereof, and a method for preparing 2, 6-dimethylnaphthalene, the catalyst comprises a carrier and an active metal component loaded on the carrier; wherein the carrier comprises a twelve-membered ring molecular sieve and a binder; the active metal component is selected from at least one of transition metals; wherein the acid amount of the B acid in the catalyst is 100-400 [mu] mol / g, and the ratio of the acid amount of the B acid to the acid amount of the L acid is (1-3): 1. The catalyst is used for preparing 2, 6-dimethylnaphthalene through a transalkylation reaction, so that the reaction of naphthalene, methylnaphthalene and monocyclic aromatic hydrocarbon with methyl not only can have higher naphthalene / methylnaphthalene conversion rate, but also can have higher 2, 6-dimethylnaphthalene selectivity and yield, and the molecular sieve catalyst can be regenerated and used for multiple times and is good in stability.

The invention provides a catalyst for preparing 2, 6-dimethylnaphthalene by catalyzing alkylation of 2-methylnaphthalene as well as a preparation method and application of the catalyst. The catalyst is prepared from the following components in percentage by mass: 60 to 90 percent of H-type boron modified MCM-22 molecular sieve and 10 to 40 percent of binder, wherein the mass of the H-type boron modified MCM-22 molecular sieve is 100 percent. The catalyst has high reaction activity and high stability at the same time.

The invention relates to a refining method of 1, 4-naphthalic acid, and belongs to the technical field of synthesis of drug intermediates. In order to solve the problems of low reaction yield and large solid waste in the prior art, the invention provides a method for refining 1, 4-naphthalic acid, which is characterized by comprising the following steps: adding a 1, 4-naphthalic acid crude product into an acetic acid solvent system, with the residual amount of 4-methyl-1-naphthalenecarboxylic acid in the 1, 4-naphthalic acid crude product being within 10% and the content of 1, 4-naphthalic acid being more than 90%, and the residual amount of 4-methyl-1-naphthalenecarboxylic acid in the 1, 4-naphthalic acid crude product being less than 10%. Heating and controlling the temperature to be 40 DEG C to the reflux temperature for heat preservation, and then cooling until a solid product is separated out, so as to obtain the refined 1, 4-naphthalic acid. According to the method, the purity of the 1, 4-naphthalic acid can be improved, the purity reaches 99.5% or above, and the yield reaches 82% or above.

The invention relates to optically active diphenol with both central chirality and axial chirality as well as a synthesis method and application of the optically active diphenol. The structural formula of the optically active diphenol is as follows: # imgabs0 #, wherein Ar1 is an aryl compound or a heteroaryl compound with different substituent groups, Ar3 is an aryl compound with different substituent groups, Ar2 is an aryl compound or a heteroaryl compound with different substituent groups, and Ar4 is halogen or hydrogen. The invention focuses on an enantioselective synthesis method for constructing a diphenol compound NAPOLs with rigid conformation. The synthesis method comprises the following steps: catalyzing 1-aryl ethynyl-2-naphthol and a derivative thereof and 8-aryl hydroxymethyl-2-naphthol and a derivative thereof through chiral phosphoric acid to synthesize an optically active NAPOLs diphenol ligand with axial chirality and central chirality. The compound has the characteristics of central chirality and axial chirality, and is expected to provide a new idea for the field of asymmetric synthesis.

The invention provides a catalyst for preparing 2, 6-dimethylnaphthalene by catalyzing alkylation of 2-methylnaphthalene as well as a preparation method and application of the catalyst. The catalyst is obtained by carrying out metal element modification on an HMCM-22 molecular sieve by adopting an ion exchange method, and the catalyst contains 0.4-3.6% of metal elements based on 100% of the mass of the catalyst; the metal element is a rare earth metal element or a transition metal element. The catalyst has good reaction stability on the premise of ensuring high reaction activity.

The invention relates to a melt crystallization purification method of beta-methylnaphthalene, and relates to the field of beta-methylnaphthalene purification, and the melt crystallization purification method comprises the following steps: sequentially carrying out first cooling crystallization, second cooling crystallization, third cooling crystallization, sweating operation, melting, recrystallization and devitrification on molten beta-methylnaphthalene to obtain beta-methylnaphthalene with the purity of more than or equal to 99.8%, wherein the second cooling crystallization is assisted by first microbubble treatment. According to the method provided by the invention, by virtue of a specific cooling crystallization process, the uniformity of crystal growth is ensured, the risk that a crystal layer is too thin or too thick in the prior art is avoided, the separation efficiency of the crystal is improved, efficient separation and extraction of high-purity beta-methylnaphthalene are realized, and the purity of the obtained beta-methylnaphthalene is greater than or equal to 99.8%.

The present application relates to a kind of preparation methods of sodium bisulfite menadione, which is prepared by the reaction of 2-methyl-1,4-naphthoquinone and sodium bisulfite in the presence of K2O-MgO / Al2O3 as an aid in the mixed solution of organic solvent and water.The present application makes the conversion rate of raw materials >99% by introducing K2O-MgO / Al2O3 as an aid, the selectivity is greater than 95%, and can reduce the phenol, quinone impurities (content <800ppm) in the product.The process is simple, the reaction condition is mild, the process is stable, the purity of product is more than 98%, and the total yield is more than 94%.

The invention discloses a method for preparing high-purity 2-methyl-6-acylnaphthalene and 2-methyl-7-acylnaphthalene through continuous catalytic reaction and rectification purification and application of the high-purity 2-methyl-6-acylnaphthalene and the 2-methyl-7-acylnaphthalene. According to the method, high-purity 2, 6-and 2, 7-acyl naphthalene products can be obtained through fixed bed catalytic synthesis, rectification and crystallization purification, firstly, the molecular sieve catalyst is modified, the catalytic conversion rate and selectivity can be further improved, the formed catalyst is suitable for fixed bed acylation synthesis reaction, the catalyst activity in a catalytic system is high, and the catalytic efficiency is high. The used catalyst can be reused after regeneration treatment. The fixed bed catalytic reaction system, the product and the catalyst can realize solid-liquid separation without hydrolysis quenching, a large amount of acidic wastewater is not generated, the fixed bed catalytic reaction system is environment-friendly, in addition, unreacted 2-methylnaphthalene in a rectification system is recycled, a target object can be purified through rectification and crystallization, a high-purity product is obtained, and the fixed bed catalytic reaction system has a good application prospect.

The application discloses a method for cracking tar into high value-added products, which adopts a route of separating light components by fractional distillation and then hydrogenating heavy components, so that the yield of target products can be affected by hydrogenation of naphthalene, methyl naphthalene and the like below 250 DEG C in the process of hydrocracking, and on the other hand, the components below 250 DEG C account for about 30% to 50%, so that the hydrogen consumption in the subsequent hydrocracking can be reduced by separating the components in advance. After the heavy fraction is subjected to hydrocracking, part of polycyclic aromatic hydrocarbons in the heavy fraction can be cracked into part of monocyclic aromatic hydrocarbons, which can be used for producing aromatic solvent oil, so that the light fraction in the hydrocracking product is separated and mixed into the light fraction generated by pre-fractionation, and the next step processing is carried out, so that the yield of high value-added products can be further improved.