188results about "Ethylene production" patented technology

Disclosed are a fluidized bed separation method and device for methanol-to-olefins quenched water. The method may subject quenched water to liquid-solid separation via a micro-cyclone separator. The method may also subject clear liquid from the micro-cyclone separator to a secondary separation via a fluidized bed separator, then sending the same to an olefin separation device, then recovering some waste heat of the quenched water, and then returning the same to a quenching tower after performing heat exchange. The method may also regenerate a separation medium by reversely feeding stripping tower purified water or quenched water, so as to release catalyst particles absorbed by the separation medium. The method may also send a catalyst slurry concentrated by the micro-cyclone separator and the fluidized bed separator to a filter-press unit for filter-press dehydration, so as to recover a catalyst.

The utility model provides a methanol-to-olefin reaction gas washing tower system, belongs to the technical field of methanol-to-olefin, and solves the problems of poor effect, high cost, poor operation effect, high investment cost, difficulty in operation and high labor intensity when a reagent is added to relieve blockage in the prior art. The device comprises a washing tower, the bottom of the washing tower is connected with a sewage pool, a pipeline at the bottom of the washing tower is connected with a deoxygenated water inlet pipe a, the deoxygenated water inlet pipe a is provided with a water pressure sensor a and an electromagnetic valve a, and the pipeline at the bottom of the washing tower is provided with an electromagnetic valve b and a flow sensor a. The method comprises the following steps: introducing a catalyst settled at the bottom of a washing tower into a sewage pool so as to relieve the problem of system blockage, when the catalyst blocks a pipeline inlet at the bottom of the tower, closing an electromagnetic valve b, cutting off a pipeline of the sewage pool, opening an electromagnetic valve a on a deoxygenated water inlet pipe a, and backflushing the pipeline inlet at the bottom of the tower by deoxygenated water, the catalyst can continuously flow into the sewage pool, the operation is simple, and the investment cost is low.

Processes, systems, and apparatus are provided for producing a compressed process gas comprising light olefin such as ethylene. The process utilizes a pyrolysis reactor to produce the process gas. A power generator utilizes a turbine operated based on an Allam cycle to produce shaft power for operating one or more compressors 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. Examples of using the shaft power for processing of the process gas can include compressing the process gas a process gas compressor powered by the produced shaft power and cooling the process gas using a refrigeration compressor powered by the produced shaft power.

The utility model provides a methanol-to-olefin starting system, belongs to the technical field of methanol-to-olefin, and solves the problems of high danger coefficient, high nitrogen consumption and high fuel consumption in the prior art. The device comprises a methanol tank, a reactor and a regenerator connected with the reactor, the reactor is provided with a feeding pipe, the feeding pipe is communicated with a medium-pressure steam inlet pipe, the regenerator is connected with an auxiliary combustion chamber, the bottom of the methanol tank is connected with a heat exchanger a through a pipeline, and the heat exchanger a is communicated with the feeding pipe through a pipeline. The top of the reactor is connected with a heat source inlet of the heat exchanger a. Medium-pressure superheated steam is matched with the auxiliary combustion chamber to heat and start, operation is easy, the structure is simple, layout is reasonable, nitrogen and fuel gas are saved, and start cost and investment cost are reduced. And a heating furnace is prevented from being started, so that the danger is reduced, and higher safety and reliability are realized.

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.

Described herein are compositions, inventories, and mixtures particles having an attrition index between 5 and 25, as measured according to ASTM D-5757 for a sieve fraction of between 40 and 105 microns.

The present invention provides a process for producing C2-C4 olefins from methanol and ethanol, comprising: A) feeding a feed stream A containing methanol, with or without ethanol, to a dimethyl ether fixed-bed reactor to catalytically convert the methanol to dimethyl ether to obtain a product stream A1 containing dimethyl ether, methanol, ethanol, and water vapor; B) Stream A1 is mixed with at least one hydrocarbon recycle stream R containing C2-C6 hydrocarbons and treated in an olefin fixed bed reactor to produce C2-C4 olefins, C5-C6 hydrocarbons and C7 + catalytically converting the hydrocarbon-containing crude product stream B into a crude product stream B comprising hydrocarbons; C) cooling crude product stream B to obtain hydrocarbon crude product stream C; D) separating the hydrocarbon crude product stream C into a valuable product stream comprising propylene, optionally a valuable product stream comprising ethylene, a valuable product stream comprising butenes, at least one C5-C6 hydrocarbon-containing recycle stream, and a C6 + separating the hydrocarbon-containing by-product stream into at least one by-product stream; E) recycling a portion of the C2-C4 olefins and at least a portion of the C5-C6 hydrocarbons to step B) as one or more hydrocarbon recycle streams; F) obtaining a valuable product stream comprising propylene, a valuable product stream comprising ethylene, and optionally a valuable product stream comprising butenes; G)C6 + disposing of said by-product stream comprising hydrocarbons; Including, the methanol- and ethanol-based stream A contains less than 1% by weight or 30% to 50% by weight of ethanol, in which case 30% to 60% by weight of ethylene, 30% to 60% by weight of propylene and 0% to 30% by weight of butenes are obtained as valuable products, based on 100% by weight of C2-C4 olefins, and furthermore 0% to 40% of said ethylene, 40% to 90% of said propylene and 0% to 100% of said butenes, based on the C2-C4 olefins present in the crude product stream B, are recycled to step B); Alternatively, the methanol and ethanol based stream A comprises 1% to 30% by weight of ethanol, in which case 0% to 20% by weight of ethylene, 70% to 100% by weight of propylene and 1% to 20% by weight of butenes are obtained as valuable products, based on 100% by weight of C2-C4 olefins, and further 0% to 100% by weight of said ethylene, 0% to 20% by weight of said propylene and 40% to 100% by weight of said butenes, based on the C2-C4 olefins present in the crude product stream B, are recycled to step B).

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.

The present invention provides a low-cost, high-silicon, multi-level porous loess-based SSZ-13 molecular sieve and its preparation method and application. Specifically, the process includes: using loess as raw material, after activation treatment, only adding a silicon source, a template agent, and water for preparation; after aging, crystallization, and ion exchange, calcining to obtain a multi-level porous high-silicon molecular sieve SSZ-13 with coexisting micropores and mesopores; the prepared high-silicon multi-level porous molecular sieve SSZ-13 has a spindle-aggregated honeycomb structure and a specific surface area of ​​425.3 to 486.19 m 2 / g, pore size distribution range is 0.4925~51.4956nm, pore volume distribution range is 0.0833~0.1810cm 3 / g, with an average particle size of 4.814 to 5.589 μm. The microstructure of the loess-based molecular sieve SSZ-13 obtained by the present invention has a multi-level pore structure with micropores and mesopores. Using it as a catalyst can significantly improve the effect of the methanol to olefins reaction, especially improve the selectivity of propylene. In addition, the loess-based molecular sieve SSZ-13 itself has a high silicon-aluminum ratio and contains a small amount of Fe 3+ ions, and their composition can also greatly improve the anti-carbon deposition performance and catalytic activity of molecular sieve SSZ-13 in methanol to propylene.

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 utility model discloses a methanol-to-olefin alkaline washing tower system which comprises a separating tower and an alkaline washing tower, the alkaline washing tower is connected with a gas inlet pipeline, the lower part of the alkaline washing tower is provided with an alkaline liquor circulating unit, the top of the alkaline washing tower is provided with a gas outlet pipeline, and the alkaline washing tower is connected with a water inlet pipeline and a water return pipeline; the bottom of the separation tower is provided with a separation tower bottom circulation, the separation tower bottom circulation is connected with a quenching water unit, and the separation tower bottom circulation is connected with a heater for heating the gas inlet pipeline through a quenching water circulation pipeline; according to the S-MTO device alkaline washing tower water washing system, a washing water recovery system process is arranged, a small part of washing water in the water washing section of the S-MTO device alkaline washing tower is directly fed into the quenching water system, the waste alkali liquid discharge amount of the alkaline washing tower is reduced, the fresh alkali consumption amount is reduced, the energy consumption is reduced, the energy consumption is reduced, and the energy consumption is reduced. Meanwhile, the waste alkali treatment burden of the waste alkali incineration device is reduced, the environmental protection risk is reduced, and device efficiency improvement is achieved.

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.

A process to reduce the peroxide content in an oil formulation, optionally comprising one or more lubrication agents; said process comprising at least one of the following steps: A) thermally treating the one or more lubrication agents, in an oxygen-free atmosphere, to achieve a peroxide level ≤ 10 ppm, based on the weight of the lubrication agent(s), and then adding said agent(s) to the oil formulation; or B) thermally treating the oil formulation, in an oxygen-free atmosphere, to achieve a peroxide level ≤ 10 ppm, based on the weight of the oil formulation; C) a combination of A and B.

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.

A processing facility is provided that includes a feedstock separation system configured to separate a feed stream into a light stream and a heavy stream, a hydrogen production system configured to produce hydrogen and carbon dioxide from the light stream, and a carbon dioxide conversion system configured to produce synthetic hydrocarbons or carbon dioxide. The processing facility also includes a hydrotreating system configured to process the heavy stream, and a hydrotreater separation system configured to separate the hydrotreating system effluent into a separator tops stream and a separator bottoms stream, the separator bottoms stream being fed to the hydrogen production system.

According to the nano SAPO-34 molecular sieve and the normal-pressure synthesis method and application thereof, the method for synthesizing the nano SAPO-34 molecular sieve under the normal pressure adopts a dry gel conversion method and combines seed crystal induction to synthesize the nano SAPO-34 molecular sieve under the normal pressure, so that potential safety hazards and high equipment cost of a traditional high-pressure process are avoided; integration of molecular sieve synthesis and performance evaluation can be realized on the same reactor; meanwhile, the particle size and crystallinity of the molecular sieve can be effectively controlled and improved by adjusting the input amount of the seed crystal, and the obtained nano SAPO-34 molecular sieve is small in product particle size, uniform in distribution, high in specific surface area, high in crystallinity and excellent in stability, and shows excellent performance of low carbon deposition rate and long catalytic life when being applied to a methanol-to-olefin reaction. The mild synthesis route can provide a potential way for preparation of other molecular sieves.

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 invention relates to the technical field of preparation of olefin by methanol conversion, and discloses an SAPO-34 molecular sieve, a preparation method thereof and application of the SAPO-34 molecular sieve in a methanol-to-olefin process. The method comprises the following steps: (1) mixing melamine with water to obtain a mixed solution of melamine and water, and then mixing the mixed solution of melamine and water with an aluminum source, a silicon source, a phosphorus source, a template agent and water to obtain a mixture; and (2) mixing the mixture obtained in the step (1) with polyoxyethylene sorbitan fatty acid ester, carrying out hydrothermal crystallization reaction, and then sequentially separating, drying and roasting the obtained molecular sieve stock solution. The prepared SAPO-34 molecular sieve can improve the catalytic activity and selectivity to low-carbon olefins in a methanol-to-olefin reaction, can accommodate more carbon deposits, can effectively delay the deactivation speed caused by the carbon deposits, and further significantly prolongs the service life of a catalyst, and the method has the advantages of simple process, mild reaction conditions and low cost, and is suitable for industrial production. The method has obvious economic value and wide application prospect.

The present invention relates to the field of synthesis of catalytic materials, and discloses a SAPO-34 molecular sieve, a preparation method thereof and an application thereof. The method comprises the following steps: providing a raw material mixture containing an aluminum source, water, a phosphorus source, a silicon source, a template agent and modified starch, wherein the dosage of the modified starch is 2-10 g relative to every 100 g of the aluminum source calculated as Al2O3; carrying out crystallization on the raw material mixture under crystallization conditions; carrying out solid-liquid separation on the crystallized product, and taking the solid phase to carry out drying and calcination in sequence. The SAPO-34 molecular sieve prepared by the method of the present invention has a lower strength (desorption temperature) of medium / strong acid and a lower amount of medium strong acid / strong acid.

The present invention relates to the field of chemical technology, and discloses a reactor for preparing light olefins, comprising a cyclone body and a flow guide cylinder, wherein a cyclone chamber is provided in the cyclone body, a cyclone channel for a cyclone of raw gas to enter the cyclone chamber is provided on the circumferential wall of the cyclone body, and the cyclone chamber has a reaction area close to the circumferential wall of the cyclone chamber; the flow guide cylinder comprises an annular wall, which is arranged around the circumferential wall of the cyclone body, and an annular flow guide chamber is formed between the annular wall and the circumferential wall, and a raw gas inlet for the raw gas to enter the annular flow guide chamber is provided on the annular wall, wherein: a first end of the annular wall is provided with a product gas discharge port and a catalyst inlet respectively connected to the cyclone chamber, and a second end of the annular wall is provided with a catalyst outlet connected to the cyclone chamber. The reactor for preparing light olefins can enable the raw gas and the catalyst to react rapidly under cyclone operation, thereby reducing side reactions and improving the selectivity of the target product.

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.

A coke control reactor, a device for preparing low-carbon olefins from an oxygen-containing compound, and a use thereof are provided. The coke control reactor includes a riser reactor and a bed reactor; the bed reactor includes a bed reactor shell, and the bed reactor shell encloses a reaction zone I, a transition zone, and a gas-solid separation zone I from bottom to top; a bed reactor distributor is arranged in the reaction zone I; a coke controlled catalyst delivery pipe is arranged outside the reaction zone I; an upper section of the riser reactor penetrates through a bottom of the bed reactor and is axially inserted in the bed reactor; and an outlet end of the riser reactor is located in the transition zone. The coke control reactor can control the conversion and generation of coke species in a catalyst.

The invention relates to the field of molecular sieves, in particular to a surface silicon-poor nano SAPO-34 molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing an SAPO-34 molecular sieve seed crystal with a template agent, and then carrying out first pretreatment to obtain a mixture A; (2) mixing an aluminum source, a silicon source, a phosphorus source and water, and then performing second pretreatment to obtain a mixture B; (3) mixing the mixture A with the mixture B to obtain initial gel; and (4) carrying out rapid heating and hydrothermal crystallization on the initial gel, and then washing and roasting the obtained solid product to obtain the surface silicon-poor nano SAPO-34 molecular sieve. According to the preparation method, an expensive template agent or other organic additives do not need to be added, the process is easy to operate, and the SAPO-34 molecular sieve obtained by the method has the characteristics of nanoscale particle size and poor silicon on the surface of a crystal phase; the catalyst has the advantages of long service life, high selectivity of ethylene and propylene and high ratio of ethylene selectivity to propylene selectivity when catalyzing methanol to prepare olefin.

The present disclosure provides a method of preparing olefins from methanol, in which methanol and phenol-like molecules are used as raw material, which is gasified and then passed into a two-stage fixed-bed catalytic reactor. The raw material reacts with a catalyst A (silica-aluminum molecular sieve) and a catalyst B (silica-aluminum or phosphorus-aluminum molecular sieve) in sequence to produce ethylene. The method of the present disclosure has a high selectivity, which using phenol-like molecules as a molecular catalyst, and a catalytic reaction by co-feeding methanol and the phenol-like molecules. After gasification of the raw material, the raw material is brought into the reactor by an inert gas, and after a two-stage catalyst system, the selectivity of ethylene reaches more than 90%, which solves the problem of the products separation in the current process. In addition, the process described in the present disclosure has a good stability. A little coke is formed in catalyst during the reaction, which solves the problem that the catalyst is required to be regenerated repeatedly.

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.