526 results about "Transalkylation" patented technology

The present invention provides a process for producing a monoalkylated aromatic compound, particularly cumene, comprising the step of contacting a polyalkylated aromatic compound with an alkylatable aromatic compound under at least partial liquid phase conditions and in the presence of a transalkylation catalyst to produce the monoalkylated aromatic compound, wherein the transalkylation catalyst comprises a mixture of at least two different crystalline molecular sieves, wherein each of said molecular sieves is selected from zeolite beta, zeolite Y, mordenite and a material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07 Angstrom.

The present invention provides a process for producing a monoalkylated aromatic compound, particularly ethylbenzene or cumene, in which a polyalkylated aromatic compound is contacted with an alkylatable aromatic compound in the liquid phase and in the presence of a transalkylation catalyst comprising TEA-mordenite having an average crystal size of less than 0.5 micron.

The present invention relates to a benzene and xylene catalyst, which is synthesized by aromatics transalkylation and dealkylation. The present invention mainly solves the problem in the prior art that a high by-product content in a benzene product of the reaction products causes bad quality of the benzene product. The present invention solves the problem well by a technical proposal that a catalyst consists of 40 to 130 portions of a mixture of a beta zeolite, SiO2/Al2O3, Beta zeolite, the molar ratio of which is 10 to 100 and at least one zeolite which is selected from a mordenite, a Y zeolite, ZSM-12 or ZSM-5, 10 to 60 portions of binder, and 0.1 to 20 portions of at least one oxide of which is selected from molybdenum, palladium, fe, bismuth, cerium, lanthanum, nickel, tin or platinum, and all components are accounted by weight portions. The catalyst can be used for the technologies of a transfer of a heavy aromatic hydrocarbon of carbon-nine or above with toluene alkyl and the dealkylation and used for the industrial production of the xylene products.

A process for the production of at least one xylene isomer, paraxylene, metaxylene or orthoxylene from an aromatic feedstock that has 7 to 10 carbon atoms per molecule. The process comprises a stage for transalkylation of C7- and C9-aromatic compounds, a stage for separation of xylenes and a stage for isomerization of xylenes. The isomerization catalyst used in the process comprises at least one EUO zeolite composition whose crystals are grouped in aggregates that have a grain size with a value of Dv,90 less than or equal to 500 microns and at least one element of group VIII.

Enabling a transalkylation process to handle both C₁₀ alkylaromatics and unextracted toluene permits the following improvements to be realized. No longer extracting toluene allows a reformate-splitter column to be eliminated. The extraction unit can be moved to the overhead of a benzene column and integrated together with the transalkylation unit to reduce costs. No longer requiring a rigorous split between C₉ and C₁₀ alkylaromatics allows a heavy aromatics column to be eliminated. Such an enabled transalkylation process requires stabilization of a transalkylation catalyst through the introduction of a metal function. These improvements result in an aromatics complex apparatus with savings on inside battery limits curve costs and an improvement on the return on investment in such a complex.

Methods of preparing Group IVA and Group VIA organometallic compounds, particularly Group IVA organometallic compounds, are provided. Such manufacturing methods employ an amine and/or phosphine catalyst in a transalkylation step and may be performed in a batch, semi-continuous or continuous manner.

A process for transalkylating aromatic hydrocarbon compounds, the process comprising introducing an aromatic hydrocarbon feed stream and a water source to a transalkylation zone. The feed stream contacts a catalyst in the transalkylation zone in the presence of water, and produces a reaction product stream comprising benzene and xylene. The invention includes methods to control the transalkylation process.

A process for aromatic transalkylation and olefin reduction of a feed stream is disclosed. Transalkylation conditions provide a product having increased xylene concentration and reduced olefin concentration relative to the feed. The process may be used in a xylene production facility to minimize or avoid the necessity of feedstock pretreatment such as hydrotreating, hydrogenation, or treating with clay and/or molecular sieves.

A method for efficient use of hydrogen in aromatics production from heavy aromatic oil. A hydrocarbonaceous stream comprising C₉⁺ hydrocarbons and an essentially pure hydrogen stream are hydrotreated and hydrocracked to produce a hydrocracking zone effluent comprising aromatics. The hydrocracking zone effluent is fractionated to separately recover C₄ and lighter hydrocarbons, hydrocarbons boiling between about 180° F. and about 380° F., and diesel. The heavier hydrocarbons are combined with a low purity hydrogen-containing stream and heated, then dehydrogenated or transalkylated to form hydrogen, volatile compounds, and aromatics. The hydrogen and volatile components are separated from the aromatics and treated by pressure swing adsorption to provide an essentially pure hydrogen-containing stream, which is compressed and provided to the hydrotreating and hydrocracking steps. Liquid products are recovered from the aromatics-containing stream.

The invention relates to a method for converting heavy aromatics to light aromatics and transferring an alkyl radical, which mainly solves the problem of low activity during the reaction of converting the heavy aromatics to the light aromatics and transferring the alkyl radical in the presence of a conventional catalyst. In the invention, a new method for converting the heavy aromatics to the light aromatics and transferring the alkyl radical is adopted, wherein the catalyst comprises the following components in part by weight: a) 5 to 95 parts of nuclear-shell molecular sieve material and b)95 to 5 parts of adhesive; the nuclear phase of the nuclear-shell molecular sieve is ZSM-5; and the shell layer is beta zeolite grains with coverage of between 50 and 100 percent. The technical scheme solves the problem better and the method can be used in the industrial production of converting the heavy aromatics to the light aromatics and transferring the alkyl radical.

The invention relates to a method for hydrogenation pyrolysis of prolific benzene and xylene by using pyrolysis gasoline. The method mainly solves the problems that only BTX (B is benzene, T is toluene and X is xylene) arene is separated in the traditional process of the pyrolysis gasoline, and the light arene output contains a great amount of toluene with lower utilization value with the separated heavy arene. In the invention, alkyl transfer reaction is carried out among the pyrolysis gasoline material of C7+, the heavy arene hydrogenation and the light arene are in the presence of catalyst, and isomerization reaction is carried out on the light arene into the component rick in BTX light arene; and the liquid-phase is separated into benzene, toluene, xylene and C9+ distillate according to different boiling points, wherein the toluene and the C9+ distillate can be returned for further processing as the feedstock and the light alkane can be separated from gas-phase output, thereby favorably solving the technical problem. The method can be used for the industrial production of light arene.

There is provided a coated zeolite catalyst in which the accessibility of the acid sites on the external surfaces of the zeolite is controlled and a process for converting hydrocarbons utilizing the coated zeolite catalyst. The zeolite catalyst comprises core crystals of a first zeolite and a discontinuous layer of smaller size second crystals of a second zeolite which cover at least a portion of the external surface of the first crystals The coated zeolite catalyst finds particular application in hydrocarbon conversion processes where catalyst activity in combination with zeolite structure are important for reaction selectivity, e.g., catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.

The subject invention comprises an aromatics complex to improve yields from a mixed aromatics feed. Through the use of a novel catalyst having higher activity and stability in a transalkylation unit in the complex, a higher xylene yield is obtained.

There is provided a zeolite bound zeolite catalyst which can be tailored to optimize its performance and a process for converting hydrocarbons utilizing the zeolite bound zeolite catalyst. The zeolite bound zeolite catalyst comprises a first zeolite and a binder comprising a second zeolite. The structure type of the second zeolite is different from the structure type of the first zeolite. The zeolite bound zeolite finds particular application in hydrocarbon conversion process, e.g., catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.

Enabling a transalkylation process to handle both C₁₀ alkylaromatics and unextracted toluene permits the following improvements to be realized. No longer extracting toluene allows a reformate-splitter column to be eliminated. The extraction unit can be moved to the overhead of a benzene column that is also closely integrated with the transalkylation unit. No longer requiring a rigorous split between C₉ and C₁₀ alkylaromatics allows a heavy aromatics column to be eliminated. Such an enabled transalkylation process requires stabilization of a transalkylation catalyst through the introduction of a metal function. These improvements result in an aromatics complex apparatus with savings on inside battery limits curve costs and an improvement on the return on investment in such a complex.

A dealkylation and transalkylation catalyst for increasing the output of heavy (C9 or more) arylhydrocarbon contains the hydrogen-type zeolite containing SiO2/Al2O3 (20-90 Wt portions), adhesive (10-80) and palladium oxide (0.001-5).

A method for the transalkylation of a heavy reformate is provided. The heavy reformate is contacted with a transalkylation catalyst and hydrogen gas in a transalkylation reactor to selectively convert the heavy reformate to a xylenes-rich product stream. Light alkanes produced during the reaction can be supplied to a steam cracker where they are converted to light olefins.

A process for the conversion of a hydrocarbon feedstock to produce xylene compounds. The feedstock is selectively hydrocracked and introduced into a transalkylation zone with a hydrocarbonaceous stream rich in benzene, toluene and C₉⁺ hydrocarbons.

The invention belongs to the technical field of aromatic hydrocarbon production, and specifically relates to an integrated system and a method used for preparing aromatic hydrocarbons by taking methyl alcohol as a raw material. The method comprises following steps: methyl alcohol is delivered through an aromatization reactor so as to obtain mixed hydrocarbons rich in aromatic hydrocarbons; the mixed hydrocarbons are separated so as to obtain C1-2 hydrocarbons, C3-4 hydrocarbons, C5+ non-aromatic hydrocarbons, BTX, and C9+ heavy aromatic hydrocarbons; C1-2 hydrocarbons, C5+ non-aromatic hydrocarbons and BTX are discharged as products, C3-4 hydrocarbons are subjected to aromatization for a second time, an obtained material is directly mixed with C9+ heavy aromatic hydrocarbons, and an obtained mixture is taken as a raw material and is delivered into an alkyl transfer reactor; an obtained reaction product is delivered back to a separation tower, and a less amount of C9+ heavy aromatic hydrocarbons is discharged via rectifying tower bottom pipelines. The invention also discloses the integrated system used for preparing aromatic hydrocarbons by taking methyl alcohol as the raw material. According to the method, methyl alcohol aromatization, liquefied gas aromatization, and heavy aromatic hydrocarbon lightening are combined, so that recycle of liquefied gas and recycle of heavy aromatic hydrocarbons are realized, cost and energy consumption are saved, catalyst service cycle is prolonged, and BTX yield is increased greatly.

The invention relates to a catalytic method for the transalkylation/dealkylation of organic compounds, consisting in bringing a supply comprising organic compounds into contact with a catalyst containing a first zeolitic component that is selected from among: a) one or more zeolites having crystalline structure ITQ-13; b) one or more zeolites having crystalline structure ITQ-13, which are modified either by means of selectivation or with the incorporation of one or more metals, or both; and c) a mixture of a) and b). The invention also relates to a catalyst comprising one or more modified zeolites having crystalline structure ITQ-13.

A process for producing cumene comprising converting plastics to hydrocarbon liquid and pyrolysis gas; feeding hydrocarbon liquid to hydroprocessor to yield hydrocarbon product and first gas stream; feeding hydrocarbon product to reforming unit to produce reforming product, second gas stream, and hydrogen; separating reforming product into non-aromatics recycle stream and second aromatics stream (C₆+ aromatics); recycling non-aromatics recycle stream to reforming unit; separating second aromatics stream into benzene, C₇, C₈, C₉, C₁₀, and C₁₁+ aromatics; contacting C₇, C₉, and/or C₁₀ aromatics with a disproportionation&transalkylation catalyst/H2 to yield benzene&xylenes; conveying C₁₁+ aromatics to hydroprocessor; introducing pyrolysis gas, first and/or second gas stream to first separator to produce first propylene stream, first C₂&C₄ unsaturated stream, and saturated gas (H₂ and C_1-4 saturated hydrocarbons); introducing first C₂&C₄ unsaturated stream to metathesis reactor to produce second propylene stream; and feeding benzene, and first and/or second propylene stream to alkylation unit to produce cumene.