44results about "Hydrocarbon by isomerisation" patented technology

This application discloses a method for preparing n-butene from isobutene, comprising the following steps: contacting a raw material containing isobutene with a catalyst and reacting to obtain a product containing n-butene; the catalyst is composed of MgAl2O4 and a hierarchical porous molecular sieve; and obtaining the catalyst through the following steps: 1) subjecting the molecular sieve to alkali treatment and acid treatment in sequence to obtain the porous molecular sieve; 2) wet mixing of magnesium source and aluminum source and calcining to obtain the MgAl2O4; 3) mixing the porous molecular sieve with the MgAl2O4 and calcining to obtain the catalyst.

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.

A hydrocarbon isomerization system for an iC4 feed stream that provides for removal of C3s from an isomerization reactor feed stream by the addition of a depropanizer column to remove C3s from the reactor effluent stream after it has passed through a stabilizer column. This configuration prevents a buildup of C3s in the system and provides significant savings by reducing the size of the chloride treaters that are used to remove chlorides from off gas, increasing chlorides recovered to the hydrocarbon feed stream for use in combination with the isomerization catalyst. Significant utility savings are provided as well as a reduction in the amount of perchloroethane (PERC) and adsorbent that are required.

This invention discloses a method for the efficient conversion of isoparaffins, comprising the following steps: contacting a raw material containing isoparaffins and hydrogen with a catalyst in a reactor, reacting to obtain a product containing small molecule alkanes; wherein the isoparaffins are selected from at least one of isobutane, isopentane, neopentane, isohexane, and 3-methylpentane; wherein the small molecule alkanes are selected from at least one of ethane, propane, and n-butane; the catalyst is obtained by the following steps: mixing a metal acidic functional component, a metal basic functional component, a matrix precursor, a phosphorus auxiliary component precursor, a molding aid, and water, kneading, molding, and vacuum drying to obtain the catalyst.

The application provides a method for preparing isobutylbenzene from benzene and butene, which comprises four reactions in sequence; the first reaction is to synthesize sec-butylbenzene from benzene and butene; the second reaction is to generate 2-phenyl-2-butene by dehydrogenation of sec-butylbenzene; the third reaction is to generate 2-methyl-1-phenylpropene by isomerization of 2-phenyl-2-butene; and the fourth reaction is to generate isobutylbenzene by hydrogenation of 2-methyl-1-phenylpropene; the butene comprises 1-butene and / or 2-butene. The method uses benzene and butene as raw materials, adopts a four-step continuous series fixed-bed reaction process to synthesize isobutylbenzene, is simple to operate, can realize continuous production, does not need to use the metal potassium-sodium catalyst used in the traditional isobutylbenzene synthesis process, has small safety risk, and is suitable for industrialized production of isobutylbenzene.

The present invention relates to a process for preparing an acrylate, preferably an R-CH2-CH2-(CHR-CH2)x-acrylate, more preferably N-butyl acrylate, and in particular to an alcohol conversion process of ethanol employing a homogeneous catalyst and a base, wherein 1-butanol as a product of said alcohol conversion process is formed, and wherein said 1-butanol is converted into N-butyl acrylate by an esterification process.

Provided is a method for upgrading a bio-based material, the method including the steps of pre-treating bio-renewable oil(s) and / or fat(s) to provide a bio-based fresh feed material, hydrotreating the bio-based fresh feed material, followed by separation, to provide a bio-propane composition.

The application discloses a method for normalizing isomeric alkanes, which comprises the following steps: contacting isomeric alkanes and hydrogen with a catalyst in a reactor to obtain normal alkanes; the isomeric alkanes are selected from at least one of isobutane and isopentane; the catalyst is composed of an acidic carrier, a noble metal active component supported on the surface of the acidic carrier and an auxiliary element; the noble metal active component is selected from at least one of Pt and Pd; the auxiliary element is selected from at least one of Ce, Sn, La, Fe, Co, Ni and Cu; and the carrier is selected from at least one of molecular sieve, Al2O3 modified SO4 2‑ -WO3-ZrO2; the mass ratio of the noble metal active component to the acidic carrier in the catalyst is 0.0001-0.01:1; and the mass ratio of the auxiliary element to the acidic carrier is 0.0001-0.008:1.

The present disclosure relates to a process for converting unsaturated polyethylene into at least alkene products. The process includes contacting the unsaturated polyethylene with two or more catalyst components in a reactor containing an alkene reactant. The two or more catalyst components include a metathesis catalyst component and an isomerization catalyst component. By the contacting, at least a portion of the unsaturated polyethylene or a product derived therefrom undergoes a metathesis reaction and an isomerization reaction to produce an effluent containing at least alkene products.

An isomerization catalyst characterized in that the catalyst comprises a composite carrier and platinum supported on the composite carrier, the composite carrier comprising 15.0-80.0 mass% of hydrogen type ZSM-22 zeolite, 10.0-70.0 mass% of hydrogen type ZSM-48 zeolite, 10.0-60.0 mass% of aluminum oxide based on the composite carrier. The catalyst is used for n-alkane isomerization reaction, has high activity and good stability, and can obtain higher isomer selectivity and yield, especially higher multi-branched alkane isomer selectivity and yield, and lower cracking product yield.

Processes for producing mono-methyl alkylbenzenes from natural oils are described. The processes includes a linear selective cracking process to crack C14+ chains into C9 to C14 chains which are useful for making linear alkylbenzene for use in detergents and a hydroisomerization step to produce paraffins with mono-methyl branching which can be reacted with benzene to form the mono-methyl alkyl benzenes.

The present application relates to the technical field of molecular sieve preparation, and provides a surface silicon-rich binderless ZSM-5 molecular sieve catalyst and a preparation method and application thereof.The overall SiO2 / Al2O3 of the ZSM-5 molecular sieve catalyst is 86-203, the SiO2 / Al2O3 of a surface layer with a depth of 2-10 nm is 8-33% higher than the overall SiO2 / Al2O3; the acid strength measured by using Hammett indicator n-butylamine titration method is H0≤+2.27, and the content of surface acid sites is ≤0.02 mmol / g; and the ZSM-5 molecular sieve catalyst is a shaped body without amorphous phase.The surface silicon-rich binderless ZSM-5 molecular sieve catalyst provided by the present application does not contain inert adhesive, has extremely weak surface acidity, can improve the catalytic effect, and reduces the generation of by-products.In addition, the preparation method provided by the present application is simple in process and suitable for industrial production.

Provided is a method of preparing a delaminated Al-SSZ-70 zeolite. The method combines direct hydrothermal synthesis with CTA+ cations and an imidazolium OSDA. A post- synthetic high shear mixing treatment is also preferred. In one embodiment, an Al-SSZ-70 zeolite seed is used, preferably with a Si / Al ratio of at least 50.

The present application relates to the field of SAPO-5 molecular sieve, discloses a kind of metal-containing SAPO-5 molecular sieve catalyst and its preparation method and application and the method for preparing p-tert-butyltoluene.The catalyst includes SAPO-5 molecular sieve and active metal, the active metal is at least one selected from group VIII metal element and IB group metal element;M XPS / M XRF The value of not more than 0.15.The metal-containing SAPO-5 molecular sieve catalyst provided by the present application has simple preparation method, can promote m-tert-butyltoluene to transform into p-tert-butyltoluene in m-tert-butyltoluene isomerization reaction, effectively improves isomerization reaction performance, reduces side chain cracking reaction, further improves the yield of p-tert-butyltoluene, and realizes continuous production of p-tert-butyltoluene in fixed bed reaction, which has good industrial application prospect.

The present application belongs to the technical field of chemical production device and method, and particularly relates to a system and method for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization. The system for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization comprises a hydrogenation reactor system, an n-butane isomerization reactor system, a stabilizing tower system, a de-isobutane tower system, a de-heavy tower system and an n-butane drying system. The outlet of the hydrogenation reactor system is connected to the inlet of the n-butane isomerization reactor system. The outlet of the n-butane isomerization reactor system is connected to the inlet of the stabilizing tower system. The outlet of the stabilizing tower system is connected to the inlet of the de-isobutane tower system. The outlet of the de-isobutane tower system is connected to the inlet of the de-heavy tower system. The outlet of the de-heavy tower system is connected to the inlet of the n-butane isomerization reactor system through the n-butane drying system. The outlet of the stabilizing tower system is connected to the alkali washing tower system. The system and method for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization have the advantages of simple process, low investment, low energy consumption, high separation precision and high isobutane yield.

Integrated systems and methods of processing natural gas liquid (rich in C5 content) to produce one or more light olefins are disclosed. The systems include a reverse isomerization reactor for reverse isomerizing iso-alkane to normal-alkane. The disclosed integrated system includes the reverse isomerization of iso-pentane to normal-pentane before cracking to form one or more light olefins.

The application discloses a method for preparing normal paraffin, comprising the following steps: contacting isomeric alkanes and hydrogen with a catalyst in a reactor, and reacting to obtain normal paraffin; the isomeric alkanes are selected from at least one of isobutane and isopentane; the catalyst is composed of a double-layer spherical carrier and a noble metal active component loaded on the surface of the double-layer spherical carrier; and the noble metal active component is selected from at least one of platinum, palladium and gold.

The present disclosure relates to a process for converting olefins from waste plastic pyrolysis oil into at least alkene products. The process includes contacting waste plastic pyrolysis oil with two or more catalyst components in a reactor containing an alkene reactant. The two or more catalyst components include a metathesis catalyst component and an isomerization catalyst component. By the contacting, at least a part of the olefins or products derived therefrom in the waste plastic pyrolysis oil undergoes a metathesis reaction and an isomerization reaction to produce an effluent containing at least alkene products.

The present application relates to the field of adamantane preparation, and discloses an adamantane synthesis catalyst, a preparation method thereof and an adamantane synthesis method.The catalyst comprises component A and component B, wherein the component A comprises a heat-resistant inorganic oxide and a metal active component loaded on the heat-resistant inorganic oxide, and the component B is a molecular sieve.The adamantane synthesis catalyst and the adamantane synthesis method provided by the present application have the advantages of high adamantane yield and few by-products.

This invention discloses a method for producing isopentenene by cracking methyl tert-amyl ether. The method includes: mixing the methyl tert-amyl ether cracking reaction product with a certain amount of water to obtain a mixture; separating the mixture into oil and water, with the separated aqueous phase entering a methanol recovery tower and the separated crude isopentenene phase entering a water washing tower for washing; the washed crude isopentenene phase entering an isomerization reactor from the top of the water washing tower to convert 2-methyl-1-butene to 2-methyl-2-butene, and then entering an isopentenene refining tower for product refining to produce qualified isopentenene product; the bottom material of the water washing tower entering the methanol recovery tower; the methanol at the top of the methanol recovery tower being reused, and the fresh water obtained at the bottom being reused. This invention removes most of the methanol from the reaction product through oil-water separation, reducing the amount of subsequent water used for washing, thereby reducing the throughput of the methanol recovery tower and achieving the goal of reducing the operating cost of the equipment.

A preparation method of a xylene isomerization catalyst, comprising the following steps: adding raw materials such as a silicon source and an aluminum source, a template agent, and sodium hydroxide during a catalyst preparation process, synthesizing a Na-type Beta molecular sieve in a molecular sieve synthesis stage, wherein the molecular sieve is a Beta molecular sieve with special synthesis characteristics, a specific silicon-aluminum ratio, a specific morphology, and a specific grain size; performing ion exchange first and then forming in a molecular sieve cleaning stage, then drying and calcining the formed catalyst, directly loading noble metal on the formed catalyst, and performing activation reduction. The catalyst prepared by the above method is used for an aromatic hydrocarbon isomerization reaction, the cleaning and ion exchange are simultaneously performed in the molecular sieve mother liquor cleaning stage, the ammonia-nitrogen wastewater discharge can be effectively reduced, the catalyst preparation process is simplified, the preparation period is shortened, the catalyst preparation efficiency is improved, higher isomerization activity and xylene yield can be obtained.

This application discloses a method for synthesizing 1-butene. The method includes the following steps: contacting a raw material containing 2-butene with a catalyst and reacting to obtain a product containing 1-butene; the catalyst is a hierarchical porous molecular sieve supported on molybdenum oxide, wherein the molybdenum oxide loading is 2-10 wt%; the catalyst is obtained through the following steps: subjecting the initial molecular sieve to alkali and acid treatment to obtain a hierarchical porous molecular sieve; impregnating the hierarchical porous molecular sieve in an aqueous solution containing molybdenum salt, drying, and calcining to obtain the catalyst.

Provided herein are methods that include pretreating a C4 feedstock to produce a pretreated C4 feedstock rich in but-2-enes, providing the pretreated C4 feedstock and an ethene co-feed stream as a reactor feed stream to a combined reactor containing a metathesis catalyst and an isomerization catalyst, and metathesizing and isomerizing the reactor feed stream in the combined reactor at an operating temperature in a range from 35 °C to 100 °C to produce a reactor product stream containing propene, ethene, and C4+ olefins. The method further includes separating the reactor product stream to produce a light recycle stream rich in ethene and a C3+ olefin stream, which is separated to produce a propene product stream and a C4+ olefin stream. The method includes separating the C4+ olefin stream to produce a C4 olefin recycle stream and recycling the C4 olefin recycle stream and the light recycle stream to the combined reactor.

The present disclosure provides a catalytic process for the selective isomerization of 2-ethyl-1-butene in a linear alpha olefin stream, the catalytic process comprising: feeding a linear alpha olefin stream comprising linear alpha olefins and 2-ethyl-1-butene to a reactor containing a modified alumina catalyst to isomerize at least a portion of the 2-ethyl-1-butene to cis- or trans-3-methyl-2-pentene, wherein the period during which the feeding occurs is a flow time; withdrawing an effluent from the reactor containing less 2-ethyl-1-butene than the linear alpha olefin stream; and periodically regenerating the modified alumina catalyst by introducing a non-oxidizing environment into the reactor at flow time intervals of not more than about 200 hours, wherein the reactor is subjected to the non-oxidizing environment for a period of about 15 hours or longer, and the non-oxidizing environment has a temperature of about 250°C or greater for at least a portion of the period.

The present application relates to C9 and above heavy aromatic hydrocarbon processing technical field, it is a kind of production mesitylene method and device, the former is carried out according to the following method: under catalyst, C9 and above heavy aromatic hydrocarbon and hydrogen are carried out dealkylation isomerization reaction, then liquid phase product is separated by dehydrogenation, after three-stage rectification, mesitylene is obtained.The present application uses C9 and above heavy aromatic hydrocarbon to carry out dealkylation isomerization process, eliminates the interference of methyl ethyl benzene to mesitylene separation, maximizes the production of mesitylene, methyl ethyl benzene content <0.5%, the yield of mesitylene is greater than 25%, its process is simple, the yield of mesitylene is high, the production cost is low, compared with the traditional production BTX or blending gasoline route, the method for producing mesitylene of the present application realizes the maximization of C9 and above heavy aromatic hydrocarbon resources.

The application relates to the field of adamantane synthesis, and discloses a method for synthesizing adamantane. The method comprises the following steps: subjecting tetrahydrodicyclopentadiene to first isomerization in the presence of a first isomerization catalyst, and then subjecting the first isomerization product to second isomerization in the presence of a second isomerization catalyst, wherein the content of medium-strong acid in the first isomerization catalyst is lower than that in the second isomerization catalyst. The method for synthesizing adamantane has the advantages of high adamantane yield, few by-products, good catalyst stability, and environmental friendliness and equipment friendliness.

The application provides a modified BETA zeolite, and a preparation method thereof is as follows: step 1, a BETA zeolite molecular sieve with a silicon-aluminum ratio of 50 is ultrasonically treated with a sodium hydroxide solution at a liquid-solid ratio of 5-40 mL / g for 1-24 hours, and then is placed for 0.5-2 hours, wherein the concentration of the sodium hydroxide solution is 0.1-5 mol / L, and the treatment temperature is 20-150 DEG C; step 2, the BETA zeolite molecular sieve treated in step 1 is collected, is subjected to suction filtration, is washed, is dried, is treated with an NH4NO3 solution, and is calcined to obtain modified I zeolite; step 3, the modified I zeolite is added into a zinc nitrate solution at a liquid-solid ratio of 5-40 mL / g, is stirred for 2-24 hours, and then is placed for 0.5-2 hours, wherein the concentration of the zinc nitrate solution is 0.1-3 mol / L, and the treatment temperature is 20-150 DEG C; and step 4, the modified I zeolite treated in step 3 is collected, is subjected to suction filtration, is washed, is dried, and is calcined to obtain modified II zeolite. The modified BETA zeolite can be used in a C16-C18 Fischer-Tropsch oil raw material isomerization reaction, and the service life of a catalyst is improved.

This invention discloses a triphenylamine-mediated photocatalytic isomerization method for olefins from E to Z, belonging to the field of organic synthesis technology. This invention uses triphenylamine and 4-nitrotriphenylamine, triphenylamine compounds, as photocatalysts to catalyze the E-Z isomerization of olefins. Their molecular structures have a propeller configuration, which can drive olefin configuration inversion through triplet energy transfer without the need for metal participation, achieving low-cost, highly stable, and mild E-Z isomerization of olefins. This invention is carried out at room temperature, without the need for high temperature and pressure, resulting in low energy consumption and environmental friendliness. It has a wide substrate applicability, exhibiting good catalytic activity for olefins with different substituents such as methyl, halogen, cyano, and hydroxyl groups, with product yields reaching up to 92%. The operation is simple, the reaction process is straightforward, and it is suitable for large-scale production applications.

The invention provides a multi-acid modified long-chain isomerization catalyst and a preparation method thereof. The preparation method comprises the following steps: dipping tetragonal zirconium oxide by adopting a combination of two or three of a solution containing sulfate radicals, a solution containing phosphotungstate radicals and an ammonia water solution containing molybdate radicals, performing first drying and first roasting, and then compounding the tetragonal zirconium oxide with a ZSM-48 molecular sieve according to a mass ratio of 5: 95-95: 5 to obtain a composite carrier; impregnating the composite carrier with platinum, and performing secondary drying, secondary roasting and reduction to obtain the multi-acid modified long-chain isomerization catalyst. According to different requirements of the long-chain alkane isomerization catalyst, the acid strength, the particle size and the specific surface property of the catalyst can be adjusted by adopting different solutions and the ratio of the nanoscale tetragonal zirconium oxide to the ZSM-48.

This invention discloses a template composition for synthesizing high silica-to-alumina ratio ZSM-48 molecular sieves and its application method. The template composition consists of a reactant of an alkanolamine and a dihaloalkane as template A, and alkylammonium bromide as template B. Using this composition, high silica-to-alumina ratio ZSM-48 molecular sieves can be prepared. In the resulting high silica-to-alumina ZSM-48 molecular sieves, aluminum species preferentially accumulate in the near-port region of the one-dimensional channels, thereby precisely constructing efficient and accessible acidic sites. Catalysts prepared using this as a support can effectively improve the hydroisomerization and cracking capabilities of alkanes, and are particularly suitable for catalyzing the hydroisomerization reaction of long-chain alkanes.