37 results about "Transalkylation" patented technology

The invention discloses an aromatic hydrocarbon transalkylation catalyst as well as a preparation method and application thereof. The catalyst comprises: a) alumina; b) an amorphous aid; c) an active metal component; d) a molecular sieve; wherein the amorphous auxiliary agent is loaded on the surface of the aluminum oxide. The catalyst is used for an aromatic hydrocarbon transalkylation reaction, and has the characteristics of strong naphthalene-based substance resistance and good stability.

The present invention discloses a method for producing BTX from C9+ heavy aromatics, comprising the following contents: C9+ heavy aromatics raw materials enter a dealkylation reaction zone and a transalkylation reaction zone in accordance with the direction of logistics, wherein the dealkylation reaction zone is loaded with a dealkylation catalyst having ZSM-5 molecular sieve as the main component, and the transalkylation reaction zone is loaded with a transalkylation catalyst having Beta molecular sieve as the main component, wherein the catalyst volume ratio of the dealkylation reaction zone and the transalkylation reaction zone is 1:9~6:4, preferably 3:7~5:5, and the fraction of 65~150°C obtained by separation of the reaction material is a product rich in BTX components, and the fraction greater than 150°C can be circulated to the dealkylation reaction zone and / or the transalkylation reaction zone, preferably to the transalkylation reaction zone. The method couples the dealkylation reaction zone with the transalkylation reaction zone to realize two reactions in succession, and the benzene and toluene produced by the dealkylation reaction can be used as reactants for subsequent transalkylation reactions. The method has a high conversion rate for both polymethylbenzenes and long alkyl side-chain substituted benzenes, can effectively avoid the condensation of macromolecules, delays carbon deposition, and improves the operating cycle of the device.

The application discloses a method for selectively hydrogen-dealkylating aromatics and coupling xylene isomerization. + The method comprises the following steps: contacting aromatics, PX-lean C8 aromatics and a catalyst to perform selective hydrogen-dealkylation and xylene isomerization; wherein the catalyst comprises catalyst A, catalyst B and catalyst C, catalyst A is arranged upstream of catalyst B, and catalyst C is arranged downstream of catalyst B; wherein the catalyst A is a composite modified alumina; the catalyst B and the catalyst C are independently selected from group VIII metal modified molecular sieves. + The method provided by the application can concentrate a reaction unit to selectively hydrogen-dealkylate C8 10 C2 + The method can realize xylene isomerization in the PX-lean C8 aromatics while selectively hydrogen-dealkylating the side chains, and can cooperate with liquid phase transalkylation technology, so that an isomerization unit in an existing process is omitted, and device energy consumption, material consumption and investment are greatly reduced.

The present application relates to the technical field of petroleum chemical industry, and discloses a method and system for generating dimethylbenzene. The method comprises: sequentially performing alkylation reaction and transalkylation reaction; wherein, under alkylation reaction conditions, alkanes are contacted with benzene and hydrogen to perform alkylation reaction; under transalkylation reaction conditions, C9+ heavy aromatic hydrocarbons, toluene and hydrogen from the alkylation reaction are contacted to perform transalkylation reaction; wherein, the alkanes are raffinate oil and / or hydrogenated raffinate oil; wherein, the weight ratio of the benzene to the alkanes is 1-9:1; wherein, the weight ratio of the C9+ heavy aromatic hydrocarbons to the toluene is 1-5:1. The method uses non-aromatic hydrocarbons (C5-C9), especially catalytic reforming or steam cracking by-product non-aromatic hydrocarbons and C9+ heavy aromatic hydrocarbons as raw materials, combines alkylation reaction and transalkylation reaction, and has the characteristics of high non-aromatic hydrocarbon conversion rate and high dimethylbenzene yield.

The invention relates to the field of petrifaction and discloses a Mo-W heteronuclear bimetallic composite carrier catalyst as well as a preparation method and application thereof. The Mo-W heteronuclear bimetallic composite carrier catalyst comprises an Al2O3-SiO2 composite carrier with a three-dimensional ordered macroporous structure, and Mo-W heteronuclear bimetallic which is uniformly dispersed and loaded on the composite carrier in situ, wherein Mo and W are respectively combined with the surface of the composite carrier through Mo-O-Si and W-O-Al to form charge gradient polarization sites, the valence state of Mo is + 4 to + 6, and the valence state of W is + 4 to + 6. The catalyst provided by the invention has a good mass transfer effect, can give consideration to both acidic site density and metal dispersibility, and has high conversion rate, high selectivity and strong carbon deposition resistance when being applied to toluene disproportionation, aromatic hydrocarbon transalkylation, heavy aromatic hydrocarbon lightening and other reactions.

The invention provides a method and a system for producing aromatic hydrocarbon and olefin from diesel oil and application of the method and the system. According to the technical scheme, the method comprises the following steps: carrying out hydrocracking reaction on diesel oil to obtain a high-boiling-range light aromatic hydrocarbon material flow and a low-boiling-range light alkane material flow, wherein the n-butane content in the low-boiling-range light alkane is greater than the isobutane content; the high-boiling-range light aromatic hydrocarbon material flow is fed into an aromatic hydrocarbon combination device, after separation, benzene and toluene-containing fractions enter an extraction unit, C8 aromatic hydrocarbon is extracted as a product, toluene, C9 aromatic hydrocarbon and fractions obtained through separation enter a toluene disproportionation and transalkylation unit, and benzene and C8 aromatic hydrocarbon are produced to the maximum extent; the light alkane material flow is fed into an olefin device, so that olefin such as ethylene and propylene can be produced to the maximum extent. According to the technical scheme, the purpose of efficiently producing aromatic hydrocarbon and olefin from diesel oil is achieved, the diesel oil conversion efficiency is high, the aromatic hydrocarbon conversion selectivity is high, and the olefin yield is high.

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, a preparation method and application thereof, and an aromatic hydrocarbon liquid-phase transalkylation method. The catalyst comprises Y zeolite, clinoptilolite, copper oxide and a binder. The transalkylation catalyst is applied to liquid-phase transalkylation reaction of aromatic hydrocarbon, is beneficial to promoting transalkylation reaction of materials containing toluene and C9 < + > aromatic hydrocarbon, achieves the purpose of increasing the yield of xylene, has high aromatic hydrocarbon reaction activity and high xylene selectivity, and is suitable for industrial production of xylene.

The invention discloses a method and a system for preparing hydrogenated terphenyl. The method comprises the following steps: (1) carrying out hydroalkylation reaction on reaction benzene and hydrogen; (2) the hydroalkylation product and the raw material benzene are subjected to normal pressure rectification together, a light component material flow, a benzene-containing material flow and a heavy component material flow are obtained, and the benzene-containing material flow partially or completely enters the step (1) to serve as the reaction benzene; (3) carrying out reduced pressure rectification on the heavy component material flow to obtain a material flow containing cyclohexylbenzene and hydrogenated terphenyl; and (4) mixing the cyclohexylbenzene-containing material flow with diisopropylbenzene, carrying out a transalkylation reaction to obtain a transalkylation product, and recycling the transalkylation product back to the normal-pressure rectification in the step (2). According to the method, hydroalkylation and transalkylation reaction are combined, and normal-pressure rectification and reduced-pressure rectification are combined, so that hydrogenated terphenyl is obtained; wherein a composite mode of the atmospheric tower and the vacuum tower greatly reduces the operation difficulty of the device and improves the separation efficiency.

The application discloses a production method of cyclohexylbenzene. The method is to use benzene and dicyclohexylbenzene as raw materials, metal / USY molecular sieve as a catalyst, and hydrogen gas to generate an alkyl transfer reaction to obtain cyclohexylbenzene, wherein the molar ratio of hydrogen to benzene is 0.1-1.0. The method can obtain higher conversion rate of dicyclohexylbenzene and selectivity of cyclohexylbenzene at a lower reaction temperature, and improves the yield of cyclohexylbenzene.

The invention provides 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. The method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha includes 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 application belongs to the technical field of organic chemistry, and particularly relates to a synthesis method of tri-substituted ethylene based on an alkyliden transfer strategy. The synthesis method comprises that, in the presence of an alkali or rare earth complex catalyst, a double (hetero) aryl methane or aryl heteroaryl methane and an alpha, beta-unsaturated ketone are subjected to an alkyliden transfer reaction in an organic solvent to form a corresponding tri-substituted ethylene product. The method has the advantages of small catalyst consumption, mild conditions, no additional additives, easy-to-obtain raw materials, strong reaction universality, simple operation, no salt-type waste, and only one organic by-product, i.e., a ketone, which is a widely used chemical raw material and meets the development requirements of green chemistry. In addition, the alpha, beta-unsaturated ketone is a new alkylidenating agent for diaryl methane compounds, is stable, has flexible and changeable structure, has excellent utility in the construction of a multi-substituted olefin compound library, and greatly improves the yield of the tri-substituted ethylene product.

A disproportionation and transalkylation catalyst can be used in the catalytic conversion of alkyl aromatic hydrocarbons. The catalyst contains an acidic molecular sieve, a first metal component immobilized on the acidic molecular sieve and an oxide additive. The first metal contained in the first metal component is at least one selected from the group of Group VB metals, Group VIB metals and Group VIIB metals, the catalyst has a medium strong acid content of 0.05-2.0 mmol / g of catalyst, and a ratio of the medium strong acid content to the total acid content of 60-99%. When used in the catalytic conversion of alkyl aromatic hydrocarbons, the catalyst exhibits high reaction activity, low aromatic hydrocarbon loss rate.

The present application relates to the technical field of molecular sieve catalysts, and particularly relates to a heavy aromatic lightening and transalkylation method. A heavy aromatic lightening and transalkylation method, the method comprising: contacting heavy aromatics and optionally benzene and / or toluene with a catalyst under heavy aromatic lightening and transalkylation reaction conditions; the catalyst being a modified twelve-membered ring silicon-aluminum molecular sieve, the modified twelve-membered ring silicon-aluminum molecular sieve having a silica / alumina molar ratio of 6-100, a mesopore specific surface area of 30-300 m 2 / g, and a mesopore volume accounting for 20-95% of the total pore volume. The method has the advantages of excellent aromatic conversion, high selectivity and stability of target products (such as xylene) in the heavy aromatic lightening and transalkylation reaction, and can be used for industrial production of heavy aromatic lightening and transalkylation.

The process upgrades a low value heavy aromatics stream into a high value BTX precursor stream. It treats the C9 to C 12 Naphthalene molecules in the heavy aromatics stream of the aromatics are converted to BTX precursors by partially hydrogenating one of the aromatic rings prior to the transalkylation reactor and subsequently ring opening the saturated ring to form a single aromatic ring. The remaining C 11 Monaromatics to achieve an overall increased BTX yield.

This invention discloses a solid acid catalyst, its preparation method, and its application. The solid acid catalyst, based on its weight and by mass fraction, comprises: a) 54%–98% alumina support; b) 1%–30% at least one metal selected from Group IVB and / or Group IV; c) 0.001%–1% Pt metal; d) 0.1%–5% at least one metal selected from Group IIA; e) 0.1%–10% sulfate ions; the sum of the strong acid content and the medium-strong acid content of the catalyst accounts for ≥80% of the total acid content of the catalyst; the proportion of the strong acid content to the total acid content of the catalyst is ≤50%. This catalyst is used in the toluene disproportionation and alkyl transfer reaction, and features low reaction temperature, low hydrogen consumption, and good stability.

The present invention discloses a method for lightening C10+ heavy aromatics. The C10+ heavy aromatic feedstock sequentially enters a hydrogenation saturation zone, a hydrogenation ring-opening zone, a dealkylation reaction zone, and a transalkylation reaction zone. The reaction products are separated to obtain BTX. This method achieves the targeted conversion of C10+ aromatics to light aromatics through zone-specific intensification. While increasing the yield of light aromatics, it significantly reduces side reactions such as aromatic condensation to carbon deposition and aromatic saturation, significantly extending catalyst life.

The invention relates to the technical field of chemical industry, and provides a method for preparing 2, 6-diisopropylnaphthalene through transalkylation, which comprises the following steps: S1, after naphthalene and propylene are subjected to alkylation reaction, rectification and crystallization separation are performed to obtain first 2, 6-diisopropylnaphthalene and a mixture A; s2, carrying out transalkylation reaction on the mixture A and naphthalene under the action of a supported catalyst to obtain a monoisopropylnaphthalene mixture, continuously carrying out alkylation reaction on the monoisopropylnaphthalene mixture and propylene under the action of a hydrogen mordenite A catalyst to obtain a mixture B, and rectifying and crystallizing the mixture B to obtain second 2, 6-diisopropylnaphthalene and a mixture C; and S3, the sum of the first 2, 6-diisopropylnaphthalene and the second 2, 6-diisopropylnaphthalene is obtained, and the product 2, 6-diisopropylnaphthalene is the sum of the first 2, 6-diisopropylnaphthalene and the second 2, 6-diisopropylnaphthalene. Through the technical scheme, the problems of harsh process conditions and lower yield in the preparation process of 2, 6-diisopropylnaphthalene are solved.

A process for producing aromatic compounds from pyrolysis oil, comprising: refining the pyrolysis oil to pyrolysis gasoline in a multi-stage reactor comprising a slurry phase reactor and a fixed-bed reactor, wherein the slurry phase reactor comprises a mixed metal oxide catalyst and the fixed-bed reactor comprises a mesoporous zeolite-supported metal catalyst; aromatizing the pyrolysis gasoline in an aromatization unit; hydrodealkylation and transalkylation of a product from the aromatization unit in a hydrodealkylation-transalkylation unit, thereby generating an aromatic stream; and processing the aromatic stream in an aromatic recovery complex to produce the aromatic compounds comprising benzene, toluene, and xylenes (BTX).

The present application relates to the field of xylene preparation, and discloses a method for producing xylene, which comprises the following steps: (1) performing a hydrocracking reaction on C6+ components in a gas phase reactor to generate product A containing light hydrocarbons, C6-C7 components, C8 aromatic hydrocarbons and C9+ components; (2) performing a transalkylation reaction on the C9+ components in product A with benzene and / or toluene in a liquid phase reactor to generate product B containing xylene. The method combines high-temperature gas phase reaction and low-temperature liquid phase reaction to realize efficient xylene yield increase, and is conducive to improving xylene selectivity due to effective inhibition of high-activation-energy hydrocracking and demethylation side reactions. Through the combined technology, aromatic hydrocarbon loss can be effectively reduced, operating energy consumption can be reduced, and xylene yield can be improved.

The invention discloses a method for preparing 2-isopropyl-6-methylnaphthalene from 2-methylnaphthalene, and relates to the technical field of organic compound preparation. The method comprises the following steps: filling a fixed bed reactor with a modified molecular sieve catalyst, then introducing a mixture of 2-methylnaphthalene and diisopropylbenzene at a certain temperature, pressure and space velocity, carrying out an isopropylation reaction, and carrying out transalkylation to generate 2-isopropyl-6-methylnaphthalene. The 2-methylnaphthalene and diisopropylbenzene mixture is fed, and the solid 2-methylnaphthalene raw material does not need to be heated or a solvent does not need to be used, so that the operation difficulty is reduced. And the ratio of 2-methylnaphthalene to diisopropylbenzene can be changed, so that the conversion rate of 2-methylnaphthalene can be up to 96.0%.

This invention discloses an MWW-type molecular sieve, its preparation method, and its applications. The molecular sieve has an aluminum (Al) framework. [F] ) and non-framework aluminum (Al) [EF] The weight ratio of the components is 5.0 to 16.0:1. This invention provides a novel MWW-type molecular sieve. The catalyst prepared using the molecular sieve of this invention, when used in the reaction of polycyclohexylbenzene and phenylalkyl transfer to cyclohexylbenzene, can improve the conversion rate of polycyclohexylbenzene and the selectivity of the cyclohexylbenzene product.

The present application provides a method for reducing benzene content in gasoline by catalytic transalkylation and a method for producing low-benzene-content gasoline. Benzene-rich gasoline is cut into light distillate, middle distillate and heavy distillate by high-precision distillation. The benzene-rich middle distillate and the gasoline or diesel distillate enriched with C9 and C10 monocyclic heavy aromatics by staged injection are introduced into a fluidized bed or moving bed or fixed bed reactor to contact a mesoporous molecular sieve catalyst to perform catalytic transalkylation reaction, so that benzene and heavy aromatics are efficiently converted into xylene, etc., thereby converting benzene-rich gasoline and catalytic cracking light diesel into high-octane low-benzene gasoline. The method of the present application reduces the benzene content and olefin content in gasoline while increasing the octane value of gasoline. Not only does it solve the problem of high benzene content in refinery gasoline which is difficult to meet the national VI standard for motor gasoline, but also reduces the diesel-gasoline ratio of the catalytic cracking unit and increases the production of high-quality gasoline.

This invention discloses an alkyl transfer catalyst and its preparation method. The alkyl transfer catalyst contains a metal hydrogenation component, a modified Beta molecular sieve, and a binder. Based on the weight of the alkyl transfer catalyst, the content of the modified Beta molecular sieve is 30wt%~90wt%, and the content of the hydrogenation metal is 0.1wt%~5wt%. The ratio of acid content inside the micropores to acid content outside the micropores of the alkyl transfer catalyst is A. in / A out The concentration is 100-500, preferably 150-400, and more preferably 200-300. The method includes the preparation of a modified Beta molecular sieve and the preparation of a catalyst containing the modified Beta molecular sieve. The alkyl transfer catalyst, while improving xylene yield, can significantly reduce side reactions such as aromatic condensation carbon deposition and aromatic saturation, thus improving catalyst lifetime.

The application relates to the field of catalysts, and discloses a composite solid acid catalyst as well as a preparation method and application thereof. The composite solid acid catalyst contains a silicon-aluminum molecular sieve, a first metal active component, sulfate ions and a second metal active component; the first metal active component is selected from at least one of non-noble metal elements in groups IVB, VB, VIB, VIIB and VIII; the second metal active component is selected from at least one of noble metal elements; wherein the proportion of the amount of super strong acid with H0<-12 in the total amount of H0<-3 in the catalyst is more than 20%. The composite solid acid catalyst is suitable for treating complex hydrocarbon raw materials, is applied to reactions such as aromatic hydrocarbon isomerization, dismutation and alkyl transfer, dealkylation or hydrocracking, and has the advantages of high reaction activity and high product selectivity.

This invention relates to the field of mesitylene production technology, specifically a method for producing benzene and mesitylene from xylene. The method comprises the following steps: xylene undergoes an alkyl transfer reaction catalyzed by a catalyst in a reactor; the reaction products are separated to obtain a xylene-mesitylene mixture and toluene; the xylene-mesitylene mixture is then cryogenically crystallized to obtain mesitylene. This method for producing benzene and mesitylene from xylene produces products with stable composition and high selectivity for mesitylene. Under specific catalyst and reaction conditions, benzene and mesitylene can be controllably produced without anhydrous formation. The mesitylene selectivity is between 52% and 64%, and the product composition is stable. This method avoids the problem of acidic water formation caused by using methanol as a raw material, thus improving production efficiency and reducing production costs.

The invention discloses a preparation method of a ZSM-5 molecular sieve catalyst with low outer surface acidity and application of the ZSM-5 molecular sieve catalyst in an isomerization upper-layer reaction of de-ethyl xylene, and belongs to the technical field of molecular sieve catalysts. The alkali-silica ratio in the synthesis process is reduced through precise regulation and control, and synthesis of the ZSM-5 molecular sieve with low outer surface acidity is realized; zinc nitrate is adopted as a precursor, the acidity of the ZSM-5 molecular sieve is modulated through a metal-acid center synergistic effect, and the side reaction activity such as transalkylation is reduced; the surface of the molecular sieve is coated with Silicalite-1 by using a seed crystal guiding liquid auxiliary method so as to further eliminate the outer surface activity of an upper agent. According to the method, side reactions in the deethylated xylene isomerization upper layer reaction are effectively inhibited, and a new path is opened up for industrial application of the efficient deethylated xylene isomerization upper layer agent.

The invention discloses a production method of p-xylene, which comprises the following steps: (I) C8 < + > aromatic hydrocarbon enters a hydrodealkylation unit, and a dealkylation liquid phase product enters a BTX fractionation unit; (II) feeding methylbenzene and trimethylbenzene / tetramethylbenzene separated by the BTX fractionation unit into a liquid-phase transalkylation unit, and feeding a liquid-phase transalkylation product into the BTX fractionation unit; (III) the C8 aromatic hydrocarbon separated by the BTX fractionation unit enters a PX separation unit, and a p-xylene product and PX-poor C8 aromatic hydrocarbon are obtained through separation; and (IV) the PX-poor C8 aromatic hydrocarbon enters a liquid phase isomerization unit, and a liquid phase isomerization product enters a BTX fractionation unit. The method provided by the invention adopts a process combining a C8 < + > aromatic hydrocarbon gas-phase high-selectivity hydrodealkylation technology, a liquid-phase transalkylation reaction and a liquid-phase isomerization reaction, and has the characteristics of low loss and energy consumption and less investment.

A catalyst stacked bed system having different metal concentrations for transalkylation is described, along with a transalkylation process utilizing the catalyst. A first catalyst bed comprising the same zeolite and metal is present on top of a second catalyst bed comprising zeolite and metal in order to optimize performance benefits. The catalyst stacked bed system may include two or more catalyst beds. The first catalyst bed is positioned to contact the feed prior to the second (or subsequent) catalyst bed. The first catalyst bed has a total metal content of 1 wt% or more, and its total metal content is higher than the second catalyst bed. Each subsequent bed has a lower metal content than the previous bed. The metals of the first and second beds are selected from Groups 6-10 and 14 of the Periodic Table or combinations thereof.