40results about How to "Increase aromatics yield" patented technology

The use of a novel catalyst in a reforming process is disclosed. The catalyst comprises a refractory inorganic oxide, platinum-group metal, Group IVA(IUPAC 14) metal, indium and lanthanide-series metal. Utilization of this catalyst in the conversion of hydrocarbons, especially in a reforming process, results in significantly improved selectivity to the desired gasoline or aromatics products.

The invention relates to a light-hydrocarbon aromatized catalyst which comprises the following components according to the mass percent: 20-75 percent of zeolite with MFI structure, 20-75 percent of aluminum phosphate and 0.5-8.0 percent of zinc oxide. The catalyst is used for the light-hydrocarbon aromatization reaction and has better aromatization activity, low carbon deposition rate in the reaction and long one-way service life.

Methods and systems utilizing gas jets to carry biomass into a biomass conversion reactor are described. Reactor configurations and conditions for carrying out processes utilizing the gas jets are also described. The use of gas jets has been found to be especially desirable for operation with pyrolysis of biomass in catalytic fluidized bed reactors.

A process for reforming a hydrocarbon stream is presented. The process involves splitting a naphtha feedstream to at least two feedstreams and passing each feedstream to separation reformers. The reformers are operated under different conditions to utilize the differences in the reaction properties of the different hydrocarbon components. The process utilizes a common catalyst, and common downstream processes for recovering the desired aromatic compounds generated.

The invention relates to a catalyst for preparing arene from synthesis gas and a use method of the catalyst, and mainly solves the technical problems of long technological process, high production cost and low arene yield which exist during a process of preparing the arene from the synthesis gas in the prior art. According to the use method, under the condition of the temperature of 250-450 DEG C, pressure of 0.01-8.0 MPa and synthesis gas volume space velocity of 400-10000h<-1>, an oxygenated compound is taken as raw material, the raw material is in contact with and is reacted with the catalyst in an reactor, so that a material flow containing the arene is obtained; by utilizing the technical scheme of a Fe-containing composite oxide and a molecular sieve composite catalyst, the above problems are well solved; and the catalyst can be applied to industrial production of preparing the arene from the synthesis gas.

The present invention provides a Zn/ZSM-11 molecular sieve catalyst modification method, which concretely comprises: carrying out heating stirring on a Na-type ZSM-11 molecular sieve for 1-5 h at a temperature of 65-85 DEG C by using an alkali and organic surfactant mixing solution; washing to achieve a neutral state; carrying out drying baking; carrying out exchange at a temperature of 70-90 DEG C by using a 0.5-1.0 mol/L ammonium nitrate solution; drying, and then baking to prepare an H- type molecular sieve; loading zinc on the obtained molecular sieve by using an equal volume impregnation method, wherein the zinc loading amount is 0.5-10.0 wt%; and drying, and then baking to prepare the catalyst. According to the present invention, the aromatic hydrocarbon yield of the Zn/ZSM-11 molecular sieve catalyst treated by the surfactant and the alkali can be further increased compared with the aromatic hydrocarbon yield of the Zn/ZSM-11 molecular sieve catalyst being subjected to the conventional alkali treatment or with no alkali treatment.

The present invention relates to a methanol-to-aromatic hydrocarbon catalyst and uses thereof. A purpose of the present invention is mainly to solve the problems of low selectivity and poor catalyst stability in the conversion of methanol into aromatic hydrocarbons in the prior art. The technical scheme of the present invention comprises that a modified mesoporous and microporous compounded molecular sieve is adopted as a catalyst, methanol is adopted as a raw material, and the raw material is subjected to an aromatization reaction at a reaction temperature of 360-500 DEG C under a reaction pressure of 0-1.0 MPa at a raw material mass space velocity of 0.4-8 h<-1> under the effect of the catalyst. With the technical scheme, the problems in the prior art are well solved. The catalyst of the present invention can be used for the industrial production of methanol-to-aromatic hydrocarbon.

The invention relates to a technique for processing methanol-to-propylene by-products. The technique is characterized by comprising the steps as follows: a liquid hydrocarbon by-product of methanol-to-propylene (MTP) is separated to obtain a dry gas, a liquefied gas and C5<+> non-aromatic and aromatic hydrocarbons after passing through two sections of fixed bed reactors of olefin aromatization and alkane aromatization; the dry gas and aromatic hydrocarbon are discharged out of a reaction system as products; the C5<+> non-aromatic hydrocarbon is returned to the alkane aromatization reactor to continue to react; the liquefied gas and the liquefied gas of the MTP process by-product enter the alkane aromatization reactor; a heat source required for aromatization of the liquefied gas is provided by a mode of adding methanol; the liquefied gas is converted into a mixed hydrocarbon product of taking aromatic hydrocarbon as a main component under the action of a molecular sieve based catalyst; and the mixed hydrocarbon product enters the dethanizer to separate after being processed by an oil-water separator. By adopting the process, gasoline aromatization and liquefied gas aromatization are combined, and the MTP by-product is effectively converted into the hydrocarbons. By adopting the process, the actual gaining rate of the liquid hydrocarbon by-product of the MTP can be up to 65-120%, and the hydrocarbon yield of liquid aromatization can be up to 32-40%.

A process for maximizing p-xylene production includes producing a naphtha fraction and a light cycle oil fraction from a fluid catalytic cracking zone. These fractions are combined and hydrotreated. Fractionation of the hydrotreated product makes a hydrocracker feed that is sent to a hydrocracking zone to make a naphtha cut and a hydrocracker product. The hydrocracker product is recycled back to the fractionation zone, and the naphtha cut is dehydrogenated in a dehydrogenation zone to make aromatics. Reforming catalyst from a catalyst regenerator moves downward through the dehydrogenation zone. Straight run naphtha and raffinate from the aromatics unit are introduced to an additional series of reforming zones. The reforming catalyst moves in parallel through the first reforming zone and the dehydrogenation zones, then is combined for entry to the second and subsequent reforming zones prior to regeneration.

The invention relates to a method for preparing aromatic hydrocarbons through catalytic conversion of methanol. A purpose of the present invention is mainly to solve the problems of low aromatic hydrocarbon yield and serious hydrothermal deactivation of the catalyst in the prior art. According to the technical scheme, a methanol raw material enters a fluidized bed reactor, and is subjected to a contact reaction with a modified ZSM-5 catalyst to obtain an aromatic hydrocarbon-containing product and a spent catalyst; the steam stripped spent catalyst enters a riser regenerator, and contacts a regeneration medium I, and charring is performed at a temperature of 500-600 DEG C; the outlet of the riser regenerator is connected to at least a set of closed cyclone separators; the semi-regeneratedcatalyst separated by the closed cyclone separators enter a fluidized bed regenerator, and contacts a regeneration medium II, and charring is continuously performed at a temperature of 630-700 DEG C;the regenerated catalyst enters a degassing tank; and the degassed product returns to the fluidized bed regenerator. With the technical scheme, the problems in the prior art are well solved. The method of the present invention can be used in the industrial production of aromatic hydrocarbons.

The invention relates to a catalyst for methanol aromatization. The catalyst is prepared from the components in percentage by mass: 55-80% of a modified IM-5/SAPO-34 composite molecular sieve and 20-45% of silicon dioxide, modified metal in the modified IM-5/SAPO-34 composite molecular sieve is M and RE, wherein M is selected from Zn, Ga, Cu or Ag, RE is Ce or La, in the modified IM-5/SAPO-34 composite molecular sieve, the content of a modified IM-5 molecular sieve is 10-95 m%, the content of an SAPO-34 composite molecular sieve is 5-90 m%, the content of M in the modified IM-5 molecular sieveas oxide is 1.0-8.0 m%, and the content of RE as the oxide is 2.0-10.0 m%. The catalyst can directly convert methanol into aromatic products, and has high C8 aromatic yield and p-xylene selectivity.

The invention relates to a partition reaction system for preparing aromatic hydrocarbon through methanol conversion and a reaction method thereof, and mainly solves the problem of low aromatic hydrocarbon yield in the prior art. A methanol raw material enters a methanol reaction zone of a fluidized bed reactor and is subjected to a contact reaction with a modified ZSM-5 catalyst, the obtained spent catalyst enters a regenerator through a spent inclined pipe and is regenerated to obtain a regenerated catalyst; the regenerated catalyst enters a light hydrocarbon reaction zone through a regeneration inclined pipe and carries out contact reaction with a light hydrocarbon raw material;the obtained reaction product and a semi-spent catalyst go up together; the reaction product enters the methanol reaction zone through a filter at the top of the settling zone, the semi-spent catalyst enters the settling zone and enters the methanol reaction zone through a macroporous distribution plate at thebottom of the settling zone, and the reaction product enters a subsequent separation system through a cyclone separator, the problems are well solved, and the reaction system and reaction method canbe used for industrial production of aromatic hydrocarbons.

The invention relates to an aromatic hydrocarbon composite molecular sieve catalyst prepared by methanol and a synthetic method thereof, which mainly solve the problems of low reaction activity of the single molecular sieve catalyst in the prior art. The catalyst comprises the following components in parts by weight: a) 25-85 parts of the ZSM-22/SAPO-34 composite molecular catalyst; b) 1-10 parts of metallic elements; and c) 10-70 parts of a structure promoter. The catalyst can better solve the problem, and can be used for industrial production for producing aromatic hydrocarbons by methanol.