549results about "Distillation purification/separation" patented technology

The invention relates to an acetylene purification system and method, in particular to a method for removing impurities in acetylene to an electronic-grade acetylene level through a membrane separation technology coupled rectification process, and belongs to the field of gas separation. Aiming at the characteristics of an industrial grade acetylene material, the invention provides a technology for preparing electronic grade acetylene based on membrane separation coupling rectification, the membrane separation technology and the rectification technology are organically coupled, and a safe solvent is introduced into a rectification tower, so that the thermal stability of liquid acetylene is effectively improved, and the explosion risk is remarkably reduced. According to the technology, efficient preparation of the electronic-grade acetylene (the purity is greater than or equal to 99.9999%) is realized, and the method has a good industrial application prospect and popularization value.

The invention relates to the technical field of C9 heavy aromatics, in particular to a method and device for producing mesitylene from C9 heavy aromatics, and the method comprises the following steps: firstly, in the presence of a catalyst, mixing the C9 heavy aromatics with hydrogen, performing dealkylation isomerization reaction and dehydrogenation separation to obtain a liquid-phase product, and then performing two-stage separation on the liquid-phase product to obtain mesitylene. And mesitylene is produced to the maximum extent. The C9 heavy aromatics are subjected to selective dealkylation and trimethylbenzene isomerization reaction, and the obtained product does not contain propylbenzene, and the content of methyl-ethylbenzene is 1t; the method has the advantages that the yield of mesitylene is more than or equal to 0.2%, the interference of methyl ethyl benzene on the separation of the mesitylene is eliminated, the loss of the mesitylene is small, the one-way yield of the mesitylene is more than or equal to 12%, the reaction process is simple, the mesitylene and unsym-trimethylbenzene products are high in purity, the unsym-trimethylbenzene can be recycled to further increase the yield of the mesitylene, the process is flexible, byproducts are few, the product value is high, and the utilization value of C9 heavy aromatic hydrocarbon resources is obviously improved.

A method for separating VdF and acetylene, the method comprising: a step for mixing a first mixture containing VdF and acetylene with an extraction solvent, which is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2, 3, 3-trifluoro-1-propene, to obtain a mixture for extraction; and a step in which the mixture for extraction is distilled to obtain a distillate having VdF as the main component and a bottom product having an extraction solvent as the main component and further containing acetylene, respectively.

This utility model discloses a displacement medium separation and recovery device for a propane dehydrogenation production line, comprising an absorption tower and a stabilizing tower. The absorption tower is connected at its middle section to the feed pipeline of the product compression unit and the feed pipeline of the gas fractionation unit. At its top, the absorption tower is connected to a dry gas separator via a non-condensable gas pipeline. The top of the dry gas separator is connected to the flare header via a flare discharge pipeline. At its bottom, the absorption tower is connected to the stabilizing tower via a rich absorbent oil pipeline. The stabilizing tower is connected to a reflux tank via a gas-phase liquefied gas pipeline. The output end of the reflux tank is connected to the gas fractionation unit via a liquefied gas pipeline, and a liquefied gas transfer pump is installed on the liquefied gas pipeline. At its lower end, the stabilizing tower is connected to the absorption tower via a lean absorbent oil pipeline, and a lean absorbent oil transfer pump is installed on the lean absorbent oil pipeline. This utility model can partially recover residual propane gas in the displacement medium, improving production efficiency and reducing environmental pollution.

The invention discloses a high-silicon crude benzene hydrogenation process which comprises the following steps: firstly, separating a raw material crude benzene into a crude benzene component I and a crude benzene component II, sequentially carrying out first-stage hydrogenation on the crude benzene component I to remove unsaturated substances such as styrene and diolefin, and carrying out second-stage hydrogenation on the crude benzene component I to remove silicon-containing compounds and residual unsaturated substances such as styrene and diolefin; and mixing with a crude benzene component II, and carrying out third-stage hydrogenation to remove impurities such as sulfur, nitrogen and the like. According to the distribution of the content of styrene and silicon in the crude benzene, styrene and silicon in the crude benzene are enriched in the crude benzene component I through distillation separation, and the crude benzene component II is removed, so that the hydrogenation styrene removal and hydrogenation desilicication reactions of the crude benzene component I are easier to carry out, meanwhile, the removal of silicon-containing compounds is further promoted through the addition of ethylenediamine, and the yield of the crude benzene is improved. The desiliconization activity and precision of second-stage hydrogenation are improved, and the problem of rapid deactivation of the catalyst caused by silicon poisoning in high-silicon crude benzene hydrogenation is effectively solved.

A method of safely mixing a hydrocarbon with an oxidant is provided. The hydrocarbon and oxidant are saturated with a non-flammable liquid in pre-mix zones that are flooded with the non-flammable liquid and fluidly connected to a common mixing zone that is partially flooded with the non-flammable liquid. The saturated hydrocarbon and oxidant combine within the common mixing zone forming bubbles of a homogeneous gas mixture of hydrocarbon and oxidant, preferably in a ratio of hydrocarbon to oxidant that is outside of the flammability limit, that can exit the non-flammable liquid into a headspace where it can be retrieved for use in an oxidative reaction process such as oxidative dehydrogenation.

Systems and methods of producing 1-hexene are disclosed. The methods include oligomerizing ethylene to produce 1-hexene in a reactor unit, which involves flowing a first solvent system into the reactor unit, the first solvent system adapted to improve selectivity of 1-hexene in the oligomerizing of the ethylene. The methods can include flowing part of a second solvent system into the reactor unit under washing mode, the second solvent system adapted to dissolve by-products in the reactor unit being washed. The methods can include flowing part of a second solvent system into the catalyst preparation unit, the second solvent system adapted to dissolve catalysts in the catalyst preparation step. The systems can include a reactor, a wax / polymer removal unit, and at least two C6 distillation columns in series for producing 1-hexene.

A process for preparing an olefin stream for oligomerization includes fractionating the olefin stream to provide a light gas stream and an olefin-rich stream. Oxygenates are absorbed from the olefin-rich stream into a water wash stream to provide an oxygenate-rich water wash stream and a washed olefin stream. The washed olefin stream can then be oligomerized.

The application discloses a system and method for preparing 1-butene by using catalytic C4, and belongs to the technical field of 1-butene production. The technical scheme is that the system comprises an etherification reactor, a catalytic distillation column, a deep etherification reactor, a light component removal column and a heavy component removal column which are sequentially connected. The application uses catalytic C4 as raw material to prepare 1-butene, widens the raw material source for preparing 1-butene, improves the utilization rate of catalytic C4, and has a good application prospect.

This disclosure provides systems and methods for purifying precursor compounds. One method includes one or more of the following steps: mixing a crude product solution with a first solvent, wherein the crude product solution comprises a precursor compound and at least one impurity; wherein the boiling point of the first solvent is higher than the boiling point of the crude product solution; feeding at least the mixture of the crude product solution and the first solvent into an evaporator; and collecting a distillate comprising the precursor compound from the evaporator, wherein the purity of the precursor compound in the distillate is greater than 95%, as determined by [further steps]. 1 Determined by H NMR. Other methods and systems are presented in this paper.

The invention belongs to the technical field of petrochemical engineering and fine chemical engineering separation, and discloses a method and device for separating alpha-olefin and isomers thereof by using metal-based ionic liquid and application, and the method comprises the following steps: mixing a raw material solution containing target alpha-olefin with an extraction agent; performing liquid-liquid extraction; after standing and layering, respectively collecting an extraction phase and a raffinate phase; components in the extraction phase and the raffinate phase are qualitatively and quantitatively analyzed, and the partition coefficient, the separation selectivity and the purity are evaluated; and analyzing the target alpha-olefin in the extraction phase, and recovering through a reduced pressure rotary evaporation process. According to the method, the metal-based ionic liquid with dual effects of pi-complexation and spatial recognition is introduced as the extraction agent, so that high-selectivity recognition and enrichment of the target normal alpha-olefin are realized, interference of internal olefin, branched olefin and saturated isoparaffin is effectively inhibited, and the purity and selectivity of the target component are remarkably improved.

The invention relates to the technical field of dry gas treatment, and discloses a method and a device for preparing polymer grade ethylene by recovering C2 components in dry gas and application, the method comprises the following steps: (1) compressing the raw material dry gas and carrying out gas-liquid separation to obtain a gas phase and a liquid phase; (2) contacting the gas phase with an absorbent for C2 component absorption to obtain absorption tail gas and an absorption rich solution; (3) performing methane desorption on the liquid phase to obtain desorbed gas and a rich absorbent; (4) desorbing and separating the rich absorbent to obtain a lean absorbent and concentrated gas; (5) the concentrated gas is subjected to acid gas removal, dehydration and impurity removal and then sent to a deethanizer for separation of light components and heavy components, and a gas phase at the top of the tower serves as feed to enter an ethylene rectifying tower for separation of ethylene and ethane; and (6) extracting a polymer-grade ethylene product from the side of the body of the ethylene rectifying tower. The C2 component recovered by the method has the advantages of high purity, high recovery rate, simple process, low steam consumption, no need of a deoxidation reactor and a demethanizer, and low energy consumption of the device.

The utility model discloses an ethylene recovery device which comprises a flash tank, a stirring tank, a first heat exchanger, a second heat exchanger and a gas-liquid separation tank, the top of the flash tank and the top of the stirring tank are both communicated with the gas-liquid separation tank, the first heat exchanger is communicated between the flash tank and the gas-liquid separation tank, and the second heat exchanger is communicated between the stirring tank and the gas-liquid separation tank. The second heat exchanger is communicated between the stirring tank and the gas-liquid separation tank, the bottom of the flash tank is communicated with the stirring tank, and a heating piece is arranged on the stirring tank. According to the device, high-purity ethylene can be effectively separated, the loss of ethylene in a solvent can be reduced, and the recycling rate of ethylene is improved.

The utility model belongs to the technical field of distillation equipment, and discloses a methylbenzene distillation device which comprises a distillation kettle, a top cover is mounted at the top end of the distillation kettle, a cooling pipe is mounted on one side of the upper surface of the top cover, and a stirring mechanism is arranged on the surface of the top cover; a first electric push rod drives a fixed box to turn over, a sweeping rod is tightly attached to the inner wall of the distillation still, then a motor is started to drive the sweeping rod to rotate through a fixed rod, the inner wall of the distillation still is swept, meanwhile, a roller rolls on the inner wall of the distillation still, and the sweeping rod is driven to rotate through transmission of a second gear and a first gear. The cleaning effect of the cleaning rod on the inner wall of the distillation still is further improved, efficient and comprehensive cleaning of the inner wall of the distillation still is achieved, and compared with a traditional manual cleaning mode, the labor intensity is greatly reduced, and the cleaning efficiency and effect are improved.

A system for recovering styrene after depolymerization of styrenic waste plastics includes a depolymerization reactor unit capable of generating a pyrolysis oil stream and a residue stream from a wast

The invention discloses a method for preparing industrial hexane with ultralow benzene content through pre-hydrogenation. The method comprises the following steps: light naphtha, hydrogen and a hydrogenation catalyst are subjected to a hydrogenation reaction in a hydrogenation reactor for desulfurization and dearomatization, and a first mixture is obtained; feeding the first mixture into a gas-liquid separator to respectively obtain a liquid-phase product and a hydrogen-containing gas-phase product, and separating hydrogen from the gas-phase product through a circulating hydrogen compressor for recycling; and sequentially carrying out second rectification and third rectification on the liquid-phase product to obtain a heavy component substance, and adsorbing the heavy component substance through a molecular sieve. According to the method, by means of front hydrogenation reaction and rear molecular sieve adsorption, on one hand, the reaction load of molecular sieve adsorption is greatly reduced while the reaction activity of the hydrogenation reaction is improved; on the other hand, an extracting agent does not need to be added, other gas-phase and liquid-phase components are not introduced except hydrogen, the preparation process is greatly simplified, and the benzene content in the obtained cyclohexane is smaller than 5 ppm.

The utility model relates to recovery device technical field, concretely is a kind of benzene recovery device, including waste oil buffer tank, waste oil buffer tank is connected with the top of crude benzene crystallization tank by pipeline, the bottom of crude benzene crystallization tank is connected with the top of fine benzene rectifying column by pipeline one, and cooling pipe is wound in side portion, and cooling pipe is connected with freezer;Pipeline one is provided with feed pump;The top of fine benzene rectifying column is connected with fine benzene condenser by pipeline, and bottom is connected with heavy residue discharge pipe;Fine benzene condenser is connected with fine benzene buffer tank by pipeline two;The utility model is through being provided with crude benzene crystallization tank and fine benzene rectifying column, first crystallization comes out crude benzene, and then distills crude benzene, and the fine benzene of distillation comes out, to realize the extraction and recovery of benzene, avoid the waste of resources, reduce cost.

The invention discloses an after-deacetylation product gas separation process for methanol-to-olefin, which belongs to the field of organic chemical industry and comprises the following steps: pre-treated and dehydrated product gas enters a C2 and C3 cutting tower, a tower top gas phase is condensed and then partially refluxed, and the rest enters the tail section of a product gas compressor; and the tower kettle material enters a depropanizing tower. And a liquid-phase material at the top of the depropanizing tower is selectively fed into the downstream demethanizing tower or deethanizing tower through a pump. The C2 and C3 cutting and fractionating system is adopted, the material flow direction is optimized, the suction load of the tail section of a product gas compressor and the propylene refrigerant consumption of a subsequent demethanizing tower are greatly reduced, and meanwhile, the material circulation amount and the washing liquid requirement in the system are reduced, so that the equipment investment and the device operation energy consumption are remarkably reduced; and the technological process is simplified.

The invention relates to the technical field of aromatic hydrocarbon separation and purification, in particular to a system and process flow for removing C8 non-aromatic hydrocarbon in xylene through membrane separation, and the system comprises a membrane separation unit, a feeding unit, a permeation side system, an interception side system, an adsorption tower feeding buffer tank outlet line and a crossover line; the membrane separation unit is provided with a membrane feeding pipeline, one end of the membrane separation unit is connected to an outlet of the membrane separation feeding buffer tank, and the other end of the membrane separation unit is connected to an inlet side pipe orifice of the separation pipeline; a membrane feeding booster pump is arranged on the membrane feeding pipeline; a spiral-wound membrane assembly is arranged in the separation pipeline; the feeding unit is provided with a xylene redistillation tower top outlet line which is connected to an inlet of the membrane separation feeding buffer tank from the xylene redistillation tower top. According to the membrane separation process adopted by the method, the non-aromatic hydrocarbon removal rate can be more than 98% under the operation conditions that the feeding pressure is 1.68 MPa, the permeation side is 20 kPa and the interception side is 1.6 MPa, and the method has definite industrial feasibility and technical advantages.

A system can be used to reduce the impurities present in a styrene monomer product distilled from a pyrolysis oil. The system can include a fractionation train downstream from a depolymerization unit. The fractionation train may include four fractionation columns in series and produce a styrene monomer product stream comprises at least 99.0 wt% styrene and 300 ppm or less cumene.

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.

A process for producing ethylene and at least one of butanol and an alkyl tert-butyl ether from field butane includes separating the field butane into an n-butane stream and an isobutane stream; cracking the n-butane stream to obtain a cracked product stream comprising n-butane, 1- butene, 2-butene, butadienes, or a combination comprising at least one of the foregoing; and at least one of the following: (1) separating the cracked product stream to obtain a butane stream and a butene stream, and reacting the butene stream with water to obtain a fuel additive comprising butanol, and (2) dehydrogenating the isobutane stream in a dehydrogenation unit to form an isobutene stream and reacting the isobutene stream with an aliphatic alcohol to produce an alkyl tert-butyl ether.

The invention relates to the field of olefin superimposition, and discloses a method and a system for preparing isomeric C8 olefin through selective superimposition of C4 olefin. The method comprises the following steps: (1) in the presence of a reaction regulator, carrying out a superposition reaction on a C4 raw material; (2) in the presence of a separation regulator, performing first separation on a material obtained by the superposition reaction in the step (1) in a residual raw material separation tower to obtain residual raw materials, a reaction regulator, the separation regulator, isomeric C8 olefin and a superposition product at the tower bottom; (3) sequentially introducing the bottom material of the residual raw material separation tower into a regulator recovery tower and an isomerized C8 separation tower, and carrying out second separation and third separation to obtain an isomerized C8 olefin gas phase; and (4) carrying out first heat exchange on the isomeric C8 olefin gas phase obtained in the step (3) and the residual raw material separation tower side draw-out material. By adopting the method disclosed by the invention, the purpose of further reducing the separation energy consumption can be achieved.

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.

Systems and methods for processing a C3 and C4 hydrocarbon mixture have been disclosed. The C3 and C4 hydrocarbon mixture is first processed in an isomerization unit to isomerize n-butane to form isobutane. The resulting effluent stream from the isomerization unit comprising primarily isobutane and C3 hydrocarbons, collectively, is flowed into a separation unit configured to separate the effluent stream to form a C3 stream comprising C1 to C3 hydrocarbons and a C4 stream comprising primarily isobutane. The isobutane in the C4 stream is further dehydrogenated to form isobutene, which is further flowed into an MTBE synthesis unit as a feedstock for producing MTBE.

Disclosed are apparatuses and processes for preparation and conversion comprising / using: a fractionation chain (4-6) that produces a xylene fraction (24); a xylene separation unit (10) that treats the xylene fraction to produce a para-xylene extract (39) and a raffinate (40); an isomerization unit (11) treating the raffinate to produce an isomerization product (42) of xylenes fed to the fractionation chain; the synthesis gas production unit (14; 15) that treats the hydrocarbon feedstock (30) to produce a synthesis gas (34) containing CO and CO2; a methanol synthesis reaction section (50) that treats the synthesis gas (34) to produce methanol (51); a toluene alkylation reaction section (13) treating the toluene-containing fraction (23) with methanol (51) to produce an alkylation effluent (32) containing xylene and fed to the fractionation chain.

The invention provides a production method of high-purity cyclopentene, and belongs to the technical field of olefin production. According to the method, a crude cyclopentene raw material rich in cyclopentene, cyclopentane and 1, 2-pentadiene is mixed with hydrogen, the mixture is introduced into an adiabatic bubbling bed reactor for a selective hydrogenation reaction, and a catalyst is modified Pd / Al2O3. After hydrogenation reaction liquid is subjected to light component removal and refining, a high-purity cyclopentene product with the content of 99.9% or above and the content of 1, 2-pentadiene being 10 ppm or below is obtained, and the monomer requirement for producing cyclopentene rubber is met.

A method for supplying deaerated water to a chemical plant, wherein the chemical plant includes a distillation column for separating a reaction effluent including water and a product. The method includes charging aerated water (water having an oxygen content greater than 50 ppbw, such as greater than 1 ppmw) to the distillation column. The aerated water in the distillation column can then be distilled to produce an oxygen-containing overhead and a bottoms fraction including deaerated water. The deaerated water in the bottoms fraction can be transported to and utilized in upstream or downstream unit operations. The reaction effluent is fed to the distillation column, converting the distillation column from an operation that separates oxygen from water to an operation that separates the product from water.

The present application relates to the field of basic organic chemistry synthesis, and particularly to a high-yield preparation method of o-terphenyl based on hydrogen participation; comprising the steps of preparing a catalyst mixed solution, preparing a reaction mixed solution, filling micro-pressure hydrogen, heating and hydrogenation coupling reaction, rough extraction through reduced pressure distillation, and recrystallization and drying; a pre-assembly reaction precursor is formed by a bidentate phosphine bidentate phosphine ligand and a supported palladium catalyst, and a coupling reaction occurs with diphenyl under the cooperation of micro-pressure hydrogen and an acidic cocatalyst; the present application does not need to use traditional halogenated aromatic hydrocarbons and organic metal reagents, solves the problems of isomer mixing and difficult separation and halogen residue affecting the performance of downstream optoelectronic materials, realizes the preparation of o-terphenyl, and simplifies the separation and purification process.

The invention provides a catalyst performance testing device with real-time monitoring and data analysis functions, the catalyst performance testing device comprises a filter, a pressure stabilizing valve, a dryer and a testing assembly, one side of the filter is fixedly connected with the pressure stabilizing valve, one side of the pressure stabilizing valve is fixedly provided with the dryer, one side of the dryer is fixedly provided with the testing assembly, and the testing assembly is fixedly connected with the pressure stabilizing valve. The filter is arranged to prevent impurities from entering a reaction zone of a catalyst to influence the accuracy of catalytic reaction, the pressure stabilizing valve adjusts the pressure of gas or liquid flow to ensure that the pressure in the system is always kept in a set range, so that the reaction environment is kept stable, and the dryer is arranged to effectively remove unwanted moisture in the system; according to the device, various impurities mainly including thiophene in crude benzene are completely removed by hydrogenation through a hydrogenation method, all sulfides are converted into H2S, nitrides are converted into NH3, oxides are converted into H2O, unsaturated hydrocarbons are subjected to hydrogenation saturation, and then the impurities are removed by extractive distillation, so that high-quality benzene is produced.