67results about "Ethylene production" patented technology

The present invention relates to a zeolitic material having an AEI-type framework structure comprising SiO2, Al2O3 and B2O3, wherein the Al:B molar ratio of the zeolitic material, is comprised in the range of from 3 to 500, and wherein the zeolitic material displays an Si:(Al+B) molar ratio of the zeolitic material, which is comprised in the range of from 2 to 11. The present invention also relates to a process for the preparation of the zeolitic material according to the present invention, to a process for the treatment of NOx by selective catalytic reduction and to an apparatus for the treatment of a gas stream containing NOx, as well as to the use of a zeolitic material according to the present invention.

The present application relates to the technical field of molecular sieve preparation, and particularly relates to a mesoporous pore size adjustable SAPO-34 / pure silicon molecular sieve and a preparation method thereof, which comprises the following steps: uniformly stirring an aluminum source, a silicon source, a phosphorus source, a structure directing agent and distilled water to obtain an initial gel; placing the initial gel in a reaction kettle and performing hydrothermal crystallization in a static oven; sequentially performing filtration, washing, drying and calcination on the obtained product to obtain a SAPO-34 molecular sieve; adding the SAPO-34 molecular sieve into a functional solution of a cationic surfactant, performing water bath heating, and sequentially performing filtration, washing, drying and calcination on the obtained product to obtain a mesoporous pore size adjustable SAPO-34 / pure silicon molecular sieve; wherein the functional solution of the cationic surfactant comprises a cationic surfactant, an organic alcohol, a silicon source, an organic base and distilled water. The preparation method of the present application significantly improves the service life of the SAPO-34 / pure silicon molecular sieve as a catalyst in MTO reaction and the selectivity of the SAPO-34 / pure silicon molecular sieve to low carbon olefins.

A fluidized catalytic cracking unit system includes: a fluidized catalytic cracking unit assembly including a first catalyst regenerator and a cracking unit, the cracking unit configured to output spent catalyst to the first catalyst regenerator; and a reformer-electrolyzer-purifier assembly comprising a reformer-electrolyzer-purifier cell, the reformer-electrolyzer-purifier cell comprising an anode section and a cathode section.

Provided are (1) a method for converting ethanol, comprising contacting a raw material mixture containing ethylene and ethanol with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms, (2) a method for converting ethanol, comprising contacting a raw material mixture containing methanol and ethanol with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms, and (3) a method for converting ethanol, comprising: contacting a raw material mixture containing ethanol and ethylene with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms; separating the reaction gas into fraction A mainly containing a hydrocarbon having 2 to 3 carbon atoms and fraction B mainly containing a hydrocarbon having 4 to 6 carbon atoms by a first distillation column; and recycling at least a portion of the fraction A as a portion of the raw material mixture to the reaction step.

The application discloses a preparation method of MTO catalyst. The method comprises the following steps: a) treating a phosphosilicate aluminosilicate molecular sieve in a titanium acid ester-containing alcohol solution, and drying to obtain a modified molecular sieve; b) mixing the modified molecular sieve obtained in the step a), a liquid medium, a matrix material, a structure reinforcing material and a binder to form a suspension; the structure reinforcing material is ceramic fiber with a diameter of 2-6 microns and a length-diameter ratio of 1-15; c) high-speed shearing the suspension obtained in the step b), and spray drying to obtain a microsphere catalyst; and d) calcining the microsphere catalyst obtained in the step c) to obtain a finished catalyst. The catalyst solves the problems of poor catalytic performance and high abrasion index of the fluidized bed catalyst in the prior art.

The present application relates to the technical field of adsorbent preparation, in particular to a preparation method and application of an adsorbent for purifying oxygen-containing compounds in an olefin stream. The preparation method comprises the following steps: (1) first, adding alumina to an alkali metal solution to modify it, filtering and drying the modified alumina to obtain modified alumina balls; (2) adding molecular sieves to a solution containing transition metal ions to perform ion exchange modification, filtering, washing, and drying the modified molecular sieves; (3) adding the modified alumina balls into a sugar bowl, then adding the obtained modified molecular sieves, adding a binder and water, and performing ball forming; (4) drying and activating the formed adsorbent to obtain a finished product. Compared with existing adsorbents, the adsorbent has the advantages of simple preparation, high adsorption precision, low adsorption heat, simple regeneration operation, low energy consumption, and the like.

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.

The invention provides a preparation method and application of an SAPO-34 molecular sieve. The preparation method of the SAPO-34 molecular sieve provided by the invention comprises the following steps: S1, carrying out first high-speed shear mixing on a used methanol-to-olefin catalyst, an aluminum source, a phosphorus source and an optional silicon source to obtain first gel; s2, performing second high-speed shearing mixing on the first gel and a template agent to obtain second gel; and S3, carrying out crystallization treatment on the second gel. According to the method provided by the invention, resource utilization of the main MTO catalyst after service can be realized, the problem of utilization of the MTO catalyst after service is efficiently and greenly solved, and meanwhile, the prepared SAPO-34 molecular sieve can still keep relatively high catalytic performance when being applied to a methanol-to-olefin reaction.

Methods for producing olefins through hydrocarbon steam cracking include passing a hydrocarbon feed that includes one or more hydrocarbons to a hydrocarbon cracking unit and passing one or more sulfur-containing compounds to the hydrocarbon cracking unit. The sulfur-containing compounds include at least hydrogen sulfide gas, and a flow rate of the sulfur-containing compounds to the hydrocarbon cracking unit is sufficient to produce a molar concentration of elemental sulfur in the hydrocarbon cracking unit of from 10 ppm to 200 ppm. The methods include cracking the hydrocarbon feed in the hydrocarbon cracking unit to produce a cracker effluent and contacting the cracker effluent with a quench fluid in a quench unit to produce at least a cracked gas and a first pygas. The first pygas has a concentration of carbon disulfide less than 50 ppmw based on the total mass flow rate of the first pygas.

The present invention relates to a catalyst for preparing a light olefin, a preparation method therefor, and a method for preparing a light olefin by using same, and can provide a catalyst for preparing a light olefin, a preparation method therefor, and a method for preparing a light olefin by using same, the catalyst comprising a porous zeolite, a clay, an inorganic oxide binder, and Ag2O and P2O5 which are supported in the pores and / or on the surface of the porous zeolite.

The invention relates to an integrated method for thermal conversion and indirect combustion of a heavy hydrocarbon feedstock in a redox chemical loop for producing hydrocarbon streams. The heavy hydrocarbon feedstock (1) is brought into contact with inert particles (2) in a thermal conversion zone (100). Thermal conversion in the absence of hydrogen, water vapour and a catalyst produces a first gaseous effluent of hydrocarbon compounds (4) and coke, which effluent is deposited on the inert particles (5). The latter is then burned in a redox chemical loop (200) in the presence of oxygen-carrying solid particles (6). The inert particles thus flow between the thermal conversion zone (100) and a reduction zone (300) of the chemical loop while the oxygen-carrying solid particles flow between the oxidation (400) and reduction zones (300) of the chemical loop.

The invention discloses a methanol-to-olefin production safety anomaly detection method based on an LSTM algorithm. The method comprises the following steps: acquiring methanol-to-olefin real-time process parameters and control instruction data; preprocessing the process parameters and the control instruction data to obtain a training set and a test set; constructing a reconstruction model based on the multilayer LSTM network, and carrying out training learning on the reconstruction model by adopting the training set to obtain a joint normal model; inputting the test set into the joint normal model, and calculating and outputting a reconstruction error of the test set and the test set in real time; and establishing a multi-stage abnormal response mechanism. According to the method, by analyzing the joint change mode of the multi-dimensional time sequence data, the complex abnormal condition can be accurately identified, the high-efficiency detection of the potential safety hazard in the olefin production process is realized, and the defect that the traditional method is difficult to fuse the multi-dimensional information and accurately identify the complex abnormal condition is overcome.

The application provides a kind of hollow SAPO-34 molecular sieve prepared by using aluminum phosphate with kanemite structure and its preparation method and application, characterized by using aluminum phosphate with kanemite structure as aluminum source and phosphorus source, and grinding and mixing with silicon source, template agent and a small amount of water, then adding into hydrothermal kettle to synthesize SAPO-34 molecular sieve with hollow structure. The synthesis method of the hollow SAPO-34 molecular sieve of the application can form hollow structure without acid-base post-treatment process or adding mesoporous template agent, the process is simple, which is beneficial to industrial scale production; and the formation of hollow structure is beneficial to diffusion mass transfer and heat conduction in methanol to olefin reaction. The SAPO-34 molecular sieve prepared by the method has a selectivity of ethylene and propylene as high as 85% in methanol to olefin reaction, and the service life reaches more than 400 minutes, which is beneficial to industrial application.

An integrated process for producing light olefins is disclosed. The integrated process comprises passing a syngas stream and a hydrogen stream to a methanol synthesis section to provide a reactor effluent comprising methanol. The reactor effluent is separated into a vapor stream and a liquid stream comprising methanol. The liquid stream comprising methanol is passed to a methanol purification section comprising at least two distillation columns, a first distillation column and a second distillation column to provide a methanol product stream. At least a portion of the methanol product stream is passed to an oxygenate conversion unit to provide an effluent comprising olefins. The reboiling heat to said the first distillation column and the second distillation column is provided from the separation section of the oxygenate conversion unit.

The present application relates to the industrial MTO reaction depth and catalyst activity intelligent control method and device. Among them, the control method is to obtain the operation data of MTO production device, set the optimization target of MTO production, take the reaction residue content as the variable reflecting the reaction depth, calculate the reaction residue content optimization value and the reaction coke rate optimization value to realize the optimization target, adopt the automatic control algorithm or the automatic control model, calculate the regeneration air flow regulating valve valve position optimization value and the regeneration slide valve valve position optimization value to realize the reaction residue content optimization value and the reaction coke rate optimization value respectively, and control the regeneration air flow regulating valve valve position and the regeneration slide valve valve position. The device is provided with an intelligent optimization controller, the operation data is obtained through the DCS of MTO production device, the regeneration air flow regulating valve valve position optimization value and the regeneration slide valve valve position optimization value under the optimization target are calculated according to the intelligent control model, and the corresponding optimization control is realized through the DCS.

An integrated process for producing light olefins is disclosed. The integrated process includes passing a syngas stream and a hydrogen stream to a methanol synthesis section to provide a reactor effluent comprising methanol. The reactor effluent is separated into a vapor stream and a liquid stream comprising methanol. A liquid stream comprising methanol is passed to a methanol purification section comprising at least two distillation columns, a first distillation column and a second distillation column, to provide a methanol product stream. At least a portion of the methanol product stream is passed to an oxygenate conversion unit to provide an effluent comprising olefins. Reboiling heat is provided to the first and second distillation columns from a separation section of the oxygenate conversion unit.

Method for carrying out a reaction I, wherein a raw material comprising methanol and / or dimethyl ether and toluene is contacted in a reactor with a catalyst obtained in an in-situ and in-line process to produce light olefins with a co-product of paroxylol, where reaction I is intended to produce light olefins from methanol and / or dimethyl ether and toluene with the co-product paroxylol, wherein a material stream I is brought into contact with the catalyst in the reaction system to obtain a material stream II, and C4 olefin or C 5+ Chain hydrocarbons are separated from material stream II, and the light olefins and paraxylene separated from material stream II and returned to the reaction system are used as products. the material stream I contains methanol and / or dimethyl ether and toluene, wherein the reaction system comprises: a first reaction zone containing a catalyst A; and a second reaction zone containing a catalyst B; and wherein catalyst A is an HZSM-5 molecular sieve catalyst modified by a phosphorus reagent and a silylation reagent, wherein the specific preparation steps are as follows: (A1) A mixture of the phosphorus reagent, the silylation reagent and toluene is fed into the first reaction zone with the HZSM-5 molecular sieve at a temperature in the range of 130°C to 500°C; (A2) The temperature is increased to over 500°C and the mixture is calcined in an air atmosphere for a period of 1 hour to 6 hours to obtain catalyst A, wherein catalyst B is an HZSM-5 molecular sieve catalyst modified by a silylation reagent, the specific preparation steps being as follows: (B1) A mixture of the silylation reagent and methanol is fed into the second reaction zone with the HZSM-5 molecular sieve at a temperature in the range of 120°C to 250°C; (B2) The temperature is increased to over 500°C and the mixture is calcined in an air atmosphere for a period of time ranging from 1 hour to 6 hours to obtain catalyst B.

A process for producing a blended jet boiling range composition stream can include: oligomerizing an ethylene stream to a C4 + olefin stream in a first olefin oligomerization unit, wherein the C4 + olefin stream contains no greater than 10 wt% combined methane, ethylene, and ethane; wherein the ethylene stream contains at least 50 wt% ethylene, at least 2000 wppm ethane, no more than 1000 wppm methane, and each no more than 20 wppm carbon monoxide and hydrogen; oligomerizing the C4 + olefin stream and the propylene / C4 + olefin stream in a second oligomerization unit to produce an isoolefin stream; subjecting at least a portion of the isoolefin stream to a hydrotreating process with hydrogen as a process gas to produce an isoparaffin stream having an olefin content of not greater than 10 wt%; and generating a blended jet boiling range using at least a portion of the isoparaffin stream.

The invention discloses a method and device for preparing low-carbon olefins, and the method comprises the following steps: 1) feeding methyl tert-butyl ether into a catalytic conversion reactor through an atomizing nozzle, and carrying out contact reaction on the methyl tert-butyl ether and a catalytic conversion catalyst under effective conditions to obtain a reaction product containing ethylene, propylene, butylene and C5 + olefins; and 2) feeding the olefin material into an etherification device to obtain methyl tert-butyl ether, and returning the methyl tert-butyl ether and / or etherified olefin to the catalytic conversion reactor. The method can improve the selectivity and yield of low-carbon olefins, obviously reduces the yield of methane in dry gas, and has good economic and social benefits.

The application relates to the field of molecular sieve preparation, and discloses a SAPO-34 molecular sieve, a preparation method and application thereof. The SAPO-34 molecular sieve has a relative amount of external surface acid sites of less than 50%. The SAPO-34 molecular sieve provided by the application has a relatively small relative amount of external surface acid sites, is applied to a reaction of methanol to olefins, and has the characteristics of high selectivity of low-carbon olefins.

The application provides a preparation method of SAPO-34 / SAPO-5 composite molecular sieve, the SAPO-34 / SAPO-5 composite molecular sieve and application. The preparation method of the SAPO-34 / SAPO-5 composite molecular sieve provided by the application comprises S1: subjecting a first mixture comprising a silicon source, an aluminum source, a phosphorus source, a first structure directing agent and water to a first crystallization treatment to obtain a first crystallization product; S2: mixing a second structure directing agent with the first crystallization product and then subjecting to a second crystallization treatment; wherein the first structure directing agent is selected from tetraethylammonium hydroxide and / or morpholine, and the second structure directing agent is selected from tetraethylammonium hydroxide and / or morpholine. When the SAPO-34 / SAPO-5 composite molecular sieve prepared by the application is used in a methanol-to-olefin reaction, the selectivity of C4 olefin in the methanol-to-olefin reaction can be effectively improved, and the SAPO-34 / SAPO-5 composite molecular sieve has a good industrial application prospect.

Provided are (1) a method for converting ethanol, comprising contacting a raw material mixture containing ethylene and ethanol with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms, (2) a method for converting ethanol, comprising contacting a raw material mixture containing methanol and ethanol with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms, and (3) a method for converting ethanol, comprising: contacting a raw material mixture containing ethanol and ethylene with a catalyst in an adiabatic reactor to obtain a reaction gas containing an olefin having 3 or more carbon atoms; separating the reaction gas into fraction A mainly containing a hydrocarbon having 2 to 3 carbon atoms and fraction B mainly containing a hydrocarbon having 4 to 6 carbon atoms by a first distillation column; and recycling at least a portion of the fraction A as a portion of the raw material mixture to the reaction step.

Processes, systems, and apparatus are provided for using a common working fluid for one or more turbines for processing a process gas and for the furnace for the pyrolysis process used to produce the process gas. The turbine(s) are operated based on a modified Allam cycle to produce power for operating one or more compressors and / or refrigerators involved in processing of the process gas while producing a reduced or minimized amount of CO2 that is released as a low-pressure gas phase product. Integrating the pyrolysis furnace with the working fluid loop can provide further benefits.

The invention relates to the field of molecular sieves, and relates to an olefin preparation method, a high-silicon small-grain ERI structure molecular sieve and a preparation method and application thereof, the microstructure of the molecular sieve is in a small-grain aggregation shape, the primary grain of the molecular sieve is less than 0.6 [mu] m at least in one dimension, and the molar ratio of silicon to aluminum of the molecular sieve is (0.1-0.6): 1 in terms of oxide. The molecule has good catalytic activity and adsorption performance, and has great industrial application prospects in reactions such as gas adsorption separation, synthesis gas and methanol conversion to olefin and the like.

Provided herein are systems and methods for converting carbon dioxide into ethanol and / or light olefins, such as ethylene and propylene. The systems and methods may be utilized to increase the yield of diverse and usable products by converting an otherwise undesirable light hydrocarbon stream, e.g., from a process for converting carbon dioxide to fuel.

The invention discloses a method and a device for preparing low-carbon olefin, which can realize high-selectivity conversion of olefin and methanol into low-carbon olefin, solve the problem of overhigh yield of methanol cracking methane, furthest obtain ethylene and propylene, improve the selectivity of methane and coke and realize efficient utilization of methanol and fossil resources.

A method of converting carbon oxides to olefins is provided. The method can include directing a renewable hydrogen feed stream and a carbon oxide feed stream to a methanation reactor to generate an oxidative coupling of methane (OCM) feed stream that includes methane. The OCM feed stream and an oxidant feed stream including oxygen are directed to an OCM reactor containing an OCM catalyst to produce an OCM effluent that includes ethylene. A system for converting carbon oxides to olefins is also provided. The methods and systems produce olefins including ethylene with negative carbon emissions.

Exemplary processes for converting one or more oxygenates to one or more olefins are disclosed. In one exemplary aspect, the process can include introducing a first input feed into an adiabatic multistage reactor with a first reactor bed and a second reactor bed. The process can also include contacting the first input feed with the first reactor bed to maintain a first temperature of the first reactor bed within a first temperature range and to produce a first reaction mixture, and introducing a second input feed into the multistage reactor such that the first reaction mixture is mixed with the second input feed to produce a first effluent. The process can also include contacting the first effluent with the second reactor bed to thereby maintain a second temperature of the second reactor bed within a second temperature range and to produce a second reaction mixture. Exemplary systems are also disclosed.

This invention relates to the field of molecular sieve technology, specifically to a SAPO-34 molecular sieve, its preparation method, and its applications. The preparation method includes: aging, pre-crystallization, and crystallization of a gel containing an aluminum source, tetraethylammonium hydroxide, a silicon source, a phosphorus source, and water; wherein the aging temperature is 40-80℃, and the aging time is 4-12 h; the pre-crystallization temperature is 90-130℃, and the pre-crystallization time is 2-24 h; and the crystallization temperature is 180-210℃, and the crystallization time is 24-50 h. The SAPO-34 molecular sieve prepared by this invention has a nanometer-sized particle size, uniform morphology, clean surface, high regularity, and the preparation operation is simple and environmentally friendly.