68 results about "Transalkylation" patented technology

Transalkylation processes using catalysts comprising three dimensional 12 membered ring zeolites with a combination of small and large pores are described. These catalysts have increased conversion of alkylphenols to phenol, cresols, and alkylbenzenes from coal-derived liquid streams compared to catalysts consisting of HZSM-5 zeolite.

The invention discloses an MWW type molecular sieve as well as a preparation method and application thereof. The weight ratio of framework aluminum (Al [F]) to non-framework aluminum (Al [EF]) of the molecular sieve is (5.0-16.0): 1. The invention provides a novel MWW type molecular sieve. The catalyst prepared by adopting the molecular sieve disclosed by the invention is applied to a reaction for preparing cyclohexylbenzene by transalkylation of polycyclohexylbenzene and benzene, and the conversion rate of the polycyclohexylbenzene and the selectivity of a cyclohexylbenzene product can be improved.

[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 method for demethylating C9 < + > aromatic hydrocarbon. The method comprises the following step: in the presence of hydrogen, carrying out contact reaction on a C9 < + > aromatic hydrocarbon raw material and an aromatic hydrocarbon dealkylation catalyst to obtain an aromatic hydrocarbon dealkylation material flow. According to the method, the dealkylation reaction can be fully utilized to realize demethylation of the C2 + side chain of the C9 + aromatic hydrocarbon, so that the number of methyl groups in the aromatic hydrocarbon material flow is increased, and the methyl / benzene ring ratio of a transalkylation unit is increased.

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 invention discloses a production method of cyclohexylbenzene. According to the method, benzene and dicyclohexylbenzene are used as raw materials, a metal / USY molecular sieve is used as a catalyst, in a hydrogen atmosphere, a transalkylation reaction is carried out to prepare cyclohexylbenzene, and the molar ratio of hydrogen to benzene is 0.1-1.0. According to the method disclosed by the invention, relatively high dicyclohexylbenzene conversion rate and relatively high cyclohexylbenzene selectivity can be obtained at relatively low reaction temperature, and the yield of cyclohexylbenzene is improved.

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 a thymol by-product transalkylation process, which comprises: preparing a raw material, adding a co-reactant m-cresol and a solvent cyclohexane to a thymol by-product alkylation liquid, filling a molecular sieve catalyst in the middle of the bed layer of a fixed bed reactor, aging the catalyst, increasing the temperature of the bed layer to 260 DEG C, continuously pumping the prepared raw material, and carrying out a reaction to obtain the thymol by-product alkylation liquid. Carrying out a catalytic transalkylation reaction by adopting an HZSM-5 molecular sieve catalyst; and transferring the catalytic transalkylation reaction product into a glass crystallization kettle, carrying out secondary solvent crystallization by using 30% and 45% ethanol, extracting 4-isopropyl-3-methylphenol, and returning the residual liquid-phase product to the catalytic transalkylation or water catalytic dealkylation process for further harmless and resourceful treatment. According to the process, the 4, 6-diisopropyl-3-methylphenol in the thymol byproduct alkylated liquid is utilized, and the high-value product 4-isopropyl-3-methylphenol which is relatively high in production content and can be extracted is produced.

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 solid acid catalyst as well as a preparation method and application thereof. The solid acid catalyst comprises the following components in percentage by mass on the basis of the weight of the catalyst: a) 50-98% of a silicon oxide carrier; b) 1%-30% of at least one metal selected from IVB group and IVA group in terms of corresponding metal oxide; c) 0.01%-10% of at least one of metals selected from the group VIB and the group VIII; d) 0.1% to 10% of sulfate ions; the ratio of the amount of the acid B to the amount of the strong acid L in the catalyst is (20: 1)-(1: 20). The catalyst is used for toluene disproportionation and transalkylation reaction, and has the characteristics of low reaction temperature, low hydrogen consumption and high conversion rate.

The invention provides a Mo element modified nano hierarchical pore ZSM-12 molecular sieve and application thereof in preparation of mesitylene through arene transalkylation, and the Mo element modified ZSM-12 molecular sieve is prepared by the following steps: uniformly mixing a silicon source, an aluminum source, water and a template agent, adding a growth inhibitor, and carrying out a hydrothermal crystallization reaction; and separating and drying, and impregnating and modifying with metal Mo to obtain the catalyst. In the invention, the protection type catalyst is used for carrying out transalkylation reaction on C7-C10 aromatic hydrocarbon to prepare mesitylene, and the catalyst in the reaction has good catalytic activity and selectivity. And the Mo modified catalyst can effectively inhibit the generation of carbon deposition in the reaction process in the presence of hydrogen, so that the service life of the catalyst is prolonged, and the catalyst has a good industrial application prospect.

The invention relates to the technical field of aromatic hydrocarbon conversion, and discloses a combined method and system for aromatic hydrocarbon conversion, and the method comprises the following steps: respectively feeding C7, C9 and above aromatic hydrocarbons from an upstream device into a catalytic transalkylation unit and a catalytic hydrodealkylation unit for separate treatment; efficient production of benzene, adjustable mixed xylene yield and production of C2-C5 light hydrocarbons with higher value are realized by adjusting the amount of materials entering the two combined systems. The system comprises a catalytic transalkylation unit, a catalytic hydrodealkylation unit and a product separation system. According to the method disclosed by the invention, the high product quality of the benzene product and the xylene product is ensured on the premise of fully producing the benzene product.

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 belongs to the technical field of organic compound production, and discloses a process method for producing benzene and xylene by lightening heavy aromatic hydrocarbon. Comprising the steps of olefin removal, gas-liquid separation, pump boosting, heat exchange and further separation. According to the present invention, with the combination technology of the olefin removal with the weak hydrogenation function and the composite molecular sieve transalkylation catalyst, the ring-opening cracking and the transalkylation of the heavy aromatic hydrocarbon are achieved, the aromatic hydrocarbon loss is reduced, and the process flow and the overall performance are superior to the traditional flow process.

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 invention discloses a solid acid catalyst as well as a preparation method and application thereof. The solid acid catalyst is prepared from the following components in percentage by mass on the basis of the weight of the catalyst: a) 54 to 98 percent of an aluminum oxide carrier; b) 1%-30% of at least one metal selected from IVB group and / or IV group metals; c) 0.001% to 1% of Pt metal; d) 0.1%-5% of at least one metal selected from group IIA metals; e) 0.1% to 10% of sulfate ions; the sum of the strong acid amount and the medium strong acid amount of the catalyst accounts for more than or equal to 80% of the total acid amount of the catalyst; the amount of the strong acid accounts for less than or equal to 50% of the total acid amount of the catalyst. The catalyst is used for toluene disproportionation and transalkylation reaction, and has the characteristics of low reaction temperature, low hydrogen consumption and good stability.

The processes upgrade a low value heavy aromatics stream into a high value BTX precursor stream. It treats the naphthalenic molecules in the heavy aromatics stream comprising C9 to C12 aromatics prior to reaching the transalkylation reactor. The naphthalenic molecules are converted into BTX precursors by partially hydrogenating one of the aromatic rings and subsequently ring opening the saturated ring to form a monoaromatic prior to the transalkylation reactor. With naphthalene no longer present, the remaining C11 monoaromatics may be processed in the aromatics complex for an overall increased BTX production.

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 discloses a modified Y-type molecular sieve and its preparation method and its application in liquid-phase transalkylation of benzene and diethylbenzene to produce ethylbenzene. The modified Y-type molecular sieve catalyst is obtained by hydrothermal treatment, acid treatment and silanization treatment of NaY-type molecular sieve. Raw materials containing benzene and mixed diethylbenzene are reacted at a reaction temperature of 190-260°C, a reaction pressure of 2.0-5MPa, and a liquid phase weight space velocity of 1-8h. ‑1 , under the condition that the weight ratio of benzene to mixed diethylbenzene is 1 to 6, ethylbenzene is contacted and reacted with a modified Y-type molecular sieve catalyst in a fixed bed reactor. The catalyst of the present invention has the remarkable characteristics of high diethylbenzene conversion rate and less impurities in the product ethylbenzene during the catalytic transalkylation reaction of benzene and diethylbenzene.

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 invention provides a method for reducing benzene content in gasoline by catalyzing transalkylation and a method for producing gasoline with low benzene content. The method comprises the following steps: performing high-precision distillation cutting on benzene-rich gasoline to obtain gasoline light fraction, middle fraction and heavy fraction; a gasoline middle fraction rich in benzene and gasoline and diesel oil fractions rich in C9 and C10 monocyclic heavy aromatics which are injected in a graded manner enter a fluidized bed or moving bed or fixed bed reactor to be in contact with a mesoporous molecular sieve catalyst for catalytic transalkylation reaction, so that benzene and heavy aromatics are efficiently converted into xylene and the like; therefore, the benzene-rich gasoline and the catalytic cracking light diesel oil are converted into the high-octane-number low-benzene gasoline. According to the method, the benzene content and the olefin content in the gasoline are reduced, meanwhile, the octane number of the gasoline is increased, the problem that refinery gasoline is high in benzene content and difficult to meet the national VI standard of automotive gasoline is solved, the diesel-gasoline ratio of a catalytic cracking device is reduced, and the yield of high-quality gasoline is increased.

Provided is a method with which it is possible to produce a monocyclic aromatic hydrocarbon such as benzene or xylene, which is effective as a base material, using a naphtha raw material containing renewable naphtha. A method for producing a monocyclic aromatic hydrocarbon, which uses a naphtha raw material containing renewable naphtha to produce at least one monocyclic aromatic hydrocarbon selected from benzene and xylene, said method comprising: a step (A-1) in which the naphtha raw material is thermally cracked in the presence of water vapor to produce toluene and separate the toluene; and a step (A-2) in which toluene is subjected to a disproportionation reaction or a transalkylation reaction to produce and separate at least one monocyclic aromatic hydrocarbon selected from benzene and xylene.

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.