25 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 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 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.

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.

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 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 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.

The present invention relates to a process for treating mixtures containing polyalkylaromatic hydrocarbons, intended for transalkylation processes, comprising a mild reduction with hydrogen in the presence of a suitable hydrogenation catalyst. The invention also relates to a transalkylation process of polyalkylaromatic hydrocarbons comprising said treatment.

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

The present application relates to the field of catalysts, and discloses a catalyst containing a Beta / Y composite molecular sieve, a preparation method and application thereof, and a method for aromatic liquid phase transalkylation, wherein the catalyst contains the Beta / Y composite molecular sieve and nickel, the mass percentage of the Beta / Y composite molecular sieve is 95-99% based on the total amount of the catalyst, and the mass percentage of nickel is 1-5% based on the nickel oxide. The catalyst is beneficial to promoting the aromatic liquid phase transalkylation reaction, and has the characteristics of high aromatic conversion rate and high xylene selectivity.

The invention relates to a method for increasing yield of xylene by lightening C10 + heavy aromatics, which comprises the following steps: C10 + heavy aromatics enter a hydrofining reactor for reaction, the obtained hydrofining reaction effluent directly enters a lightening reactor for lightening reaction, and the obtained lightening reaction effluent is separated to obtain benzene, toluene, xylene, C9 aromatics and unconverted C10 + aromatics, benzene, methylbenzene and C9 aromatic hydrocarbon are all transferred into a transalkylation reactor to increase the yield of xylene, and unconverted C10 + aromatic hydrocarbon is circulated to an inlet of a hydrofining reactor. According to the method, the C10 + heavy aromatics are lightened, the yield of the xylene is increased to the maximum extent, and the method has the characteristics of high C10 + heavy aromatics conversion rate, high xylene yield and high purity.

The present application relates to the field of paraxylene production, and discloses a method for producing paraxylene and co-producing dimethylnaphthalene. The method comprises: separating C5 + raw materials to obtain C6, C7 and C8 + components; selectively performing hydrodealkylation reaction on the C8 + component to obtain C8 + product; performing aromatic hydrocarbon separation on the C8 + product to obtain C8 component, C9-C 10 component and C 10 + component; performing disproportionation and transalkylation reaction on at least part of the C9-C 10 component and the C7 component to obtain a product rich in dimethylbenzene; performing demethylation reaction on the C 10 + component to obtain C 10 -C 11 component and C 12 + component; performing transalkylation reaction on the C 10 -C 11 component and the remaining part of the C9-C 10 component to obtain a product rich in 2,6-dimethylnaphthalene. The method can realize high-value utilization of by-product naphthalene series and co-production of 2,6-dimethylnaphthalene.