48 results about "Catalytic distillation" patented technology

The utility model relates to an energy-saving production device for preparing methyl tert-butyl ether by an isobutane dehydrogenation method. A raw material gasifier is arranged between the catalytic distillation tower feeding and discharging heat exchanger and the catalytic distillation tower, a temperature sensor is arranged on a feeding pipeline from the raw material gasifier to the catalytic distillation tower, a gas phase at the top of the catalytic distillation tower is divided into two pipelines, a compressor is additionally arranged on one pipeline, and an automatic flow regulating valve is additionally arranged on the other pipeline; a cold-side material outlet of the distillation tower feeding and discharging heat exchanger is connected with a cold-side material inlet of the raw material gasifier, a cold-side material outlet of the raw material gasifier is connected with a feeding hole in the middle lower part of the catalytic distillation tower, and a tower top discharging pipeline of the catalytic distillation tower is respectively connected with an inlet of the compressor and a hot-side material inlet of the condenser; an outlet pipeline of the compressor is connected with a hot measuring material inlet of the raw material gasifier, and a hot measuring material outlet of the raw material gasifier is connected with a liquid inlet of the return tank. According to the utility model, a heat pump technology is adopted, so that the heating power of the tower kettle reboiler is reduced, and the steam consumption is reduced; and the method is more economical.

The invention discloses a gasoline catalytic distillation desulfurization device and a gasoline catalytic distillation desulfurization method, relates to the technical field of hydrogenated gasoline processing, and aims to solve the problems that although various oil resources can be fractionated at different temperatures, the existing distillation desulfurization device is single in function and low in desulfurization efficiency due to limitation of gas retention time; the technical problem that the processing safety and quality are affected due to local hot spots and coking easily caused by distillation depending on the gas floating characteristic in the prior art is solved, and the device comprises a sealing assembly, a driving assembly connected with the sealing assembly and a collecting assembly located in the sealing assembly. By designing the collecting assembly and the isolating assembly, gasoline steam can be ensured to be in uniform contact with a solid catalyst, the desulfurization effect is guaranteed, on the other hand, gas can be in uniform contact with the isolating assembly and the collecting assembly in cooperation with operation of the motor, hot spot areas formed by overhigh local temperature in the initiation tower and the coking phenomenon are avoided, and the desulfurization efficiency is improved. And the use safety of the device and the quality of processed gasoline are ensured.

The application provides a continuous hydrogenation-isomerization method capable of meeting the treatment requirements of biological oils, especially waste oils, using a homogeneous hydrogenation process with strong adaptability to raw materials as a raw material pretreatment process, and matching a high-activity nanometer transition metal sulfide catalyst. On this basis, a catalytic distillation process is used for selective cracking of long-chain alkanes to improve the yield of medium and long-chain alkanes; an ultramicro flow hydrogen gas mixer and a reduced non-noble metal hydrogenation-isomerization catalyst are used to reduce the hydrogen / oil ratio and the energy consumption of the circulating hydrogen system, and to reduce the production cost of the catalyst, so as to finally realize efficient and low-carbon conversion of waste oils, and low-cost and high-selectivity preparation of biological aviation kerosene.

The invention relates to the technical field of MTBE production, in particular to a high-yield MTBE catalytic distillation device. The problem that the temperature of a reaction section in an existing device can only be roughly monitored is solved. Comprising a fixing shell, the fixing shell is rotationally connected with a partition part, the partition part is provided with storage modules which are vertically distributed at intervals, the storage modules are used for storing catalysts, flow guide folded plates which are evenly distributed in the circumferential direction are fixedly connected into the fixing shell, and the flow guide folded plates are located between every two adjacent storage modules. A temperature sensor is arranged at the bent position of the flow guide folded plate, a temperature control module is arranged on the lower portion of the flow guide folded plate, a motor is installed on the fixing shell, and an output shaft of the motor is in transmission with the partition piece through a gear set. The flow direction of materials is guided through the flow guide folded plate, so that most of the materials pass through the temperature sensor in the downward flowing process, and the monitoring precision of the device on the temperature of the materials at different positions is improved.

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.

The utility model provides a heavy component recycling system in an isobutene preparation process, which comprises a tertiary butanol catalytic distillation tower, an isobutene heavy component removal tower and a tertiary butanol extraction tower, the top of the tertiary butanol catalytic distillation tower is sequentially connected with a catalytic distillation tower condenser, a catalytic distillation tower return tank and an isobutene compressor; an outlet of the isobutene compressor is connected with an inlet in one side of the isobutene heavy component removal tower through a pipeline, the bottom of the isobutene heavy component removal tower is connected with the bottom of the tertiary butanol extraction tower through a pipeline, and the top of the isobutene heavy component removal tower is used for extracting high-purity isobutene; a return pipe of the tertiary butanol catalytic distillation tower is connected with an outlet of a demineralized water tank; an inlet of the demineralized water tank is connected with the bottom of the tertiary butanol extraction tower; demineralized water or sewage at the bottom of the tert-butyl alcohol catalytic distillation tower is collected from an inlet at the top of the tert-butyl alcohol extraction tower, and a purifier is arranged when the sewage at the bottom of the tower is collected. The system has the advantages of short flow, low investment, no additional energy consumption and high tertiary butanol recovery rate.

The invention relates to the field of chemical engineering, in particular to a catalytic distillation method for removing impurities in isooctane reaction raw materials, which comprises the following steps: S1, separating a C4 raw material and butadiene: treating the C4 raw material with desalted water to obtain a washed C4 raw material; carrying out coalescence dehydration treatment on the washed C4 raw material to obtain a dehydrated C4 raw material; the dehydrated C4 raw material is subjected to catalytic rectification treatment, a rectified C4 raw material is obtained, a catalyst for catalytic rectification treatment is a La-Ce / ZSM-5 catalyst, and the rectified C4 raw material is subjected to membrane separation, so that the C4 raw material and butadiene are obtained; and S2, pumping the C4 raw material into an alkylation reactor, and carrying out an alkylation reaction on the C4 raw material and isobutane under the action of a solid superacid catalyst to prepare isooctane. Compared with the prior art, the method has the advantages that impurities in the C4 raw material are removed, the byproduct butadiene and the C4 raw material are extracted, the service life of a catalyst in the isooctane preparation process can be prolonged by using the C4 raw material, the solid superacid catalyst is improved at the same time, and the C4 conversion rate and the isooctane yield are improved.

The present invention discloses a catalytic distillation device and application for heat recovery of raw coke oven gas and coal tar pretreatment, comprising: a catalytic distillation column; the lower part of the catalytic distillation column is a washing area for mechanical impurities of raw coke oven gas; the upper part of the catalytic distillation column is a suspension bed catalytic distillation area, and a gas-phase material outlet is arranged in the catalytic distillation area. The gas-phase material outlet is connected to a heat exchanger through a pipeline. After being cooled by the heat exchanger, the material is connected to the material inlet in the middle of a gas-liquid separator through a pipeline. A gas-phase discharge port is arranged at the top of the gas-liquid separator, and a liquid-phase discharge port is arranged at the bottom of the gas-liquid separator. The liquid-phase discharge port is connected to the upper reflux port of the catalytic distillation column and an external discharge pipeline; the upper reflux port of the catalytic distillation column is connected to an oil-soluble suspension bed hydrogenation catalyst addition device. The device of the present invention can recover the heat of high-temperature raw coke oven gas while effectively pretreating coal tar, laying a foundation for subsequent processing.

The invention discloses a production device and a production method of dimethyl adipate, and belongs to the technical field of organic chemical synthesis. According to the scheme, efficient conversion of part of adipic acid is realized in the pre-reactor, so that the reaction load of a subsequent catalytic distillation tower is reduced; cyclohexane is adopted as an azeotropic water-carrying agent in a catalytic distillation tower, water generated by reaction is removed in real time through azeotropic distillation, the equilibrium limitation of esterification reaction is broken, complete conversion of adipic acid is realized, and the reaction efficiency is remarkably improved. According to the method, methanol and cyclopentane are efficiently separated through the washing step, cyclic utilization of cyclopentane is achieved, and raw material consumption is greatly reduced; meanwhile, resource utilization of methanol is achieved through the methanol recovery system, and waste emission is reduced. The method can effectively reduce energy consumption and production cost, improves product quality, and solves the problems of easy catalyst deactivation, severe equipment corrosion, high three-waste treatment cost and the like in the prior art.

The invention discloses a preparation method for improving the purity of BDO, which comprises the following steps: S1, putting sulfonic acid type ion exchange resin into a vacuum drying oven, and then cooling to room temperature to form a solid acid catalyst; s2, filling a reaction section of a catalytic distillation reactor with a solid acid catalyst, and introducing reaction raw materials into the reactor; s3, sequentially carrying out high-temperature, medium-temperature and low-temperature stepped cooling catalytic distillation by using a catalytic distillation reactor, adding an inhibitor at a low-temperature stage, and forming a reaction mixture when the temperature fluctuates within a range of + / -1 DEG C; s4, discharging the reaction mixture to a gas-liquid separator, recovering unreacted hydrogen through a recovery device, and collecting low-boiling-point byproducts through a condensing device to obtain residual liquid; s5, enabling the residual liquid to enter a rectifying tower for rectification; by adopting a stepped cooling catalytic distillation mode, the BDO purity can be improved, the impurity content can be reduced, the physical property can be optimized, and the stability can be enhanced.

The present invention discloses a gasoline catalytic distillation desulfurization device and method, which relates to the technical field of hydrogenated gasoline processing, and aims to solve the technical problems that the existing distillation desulfurization device can fractionate a variety of oil resources through different temperatures, but has a single function, and is limited by the gas retention time, resulting in low desulfurization efficiency, and distillation that relies on the gas floating characteristics is also prone to cause local hot spots and coking, affecting processing safety and quality, including a sealing component, a driving component connected to the sealing component, and a collection component located in the sealing component. The present invention can ensure that gasoline vapor is uniformly in contact with the solid catalyst to ensure the desulfurization effect by designing the collection component and the isolation component. On the other hand, in conjunction with the operation of the motor, the gas can be uniformly in contact with the isolation component and the collection component, avoiding the formation of hot spots and coking caused by excessively high local temperatures in the tower, thereby ensuring the safety of the device and the quality of the processed gasoline.

The utility model discloses DMMn production equipment, and relates to the technical field of chemical production equipment. The DMMn production equipment comprises a formaldehyde concentration separator, a formaldehyde absorption tower, a pre-reactor and a reactive distillation tower, and the formaldehyde concentration separator is used for concentrating a formaldehyde solution to prepare a concentrated formaldehyde solution and dilute formaldehyde steam; the formaldehyde absorption tower is used for absorbing dilute formaldehyde steam and preparing a dilute formaldehyde solution; the pre-reactor is used for enabling part of formaldehyde to react with methanol to generate methylal; and feeding the pre-reaction material into an upper reaction section of the reactive distillation column, feeding a concentrated formaldehyde solution into a lower reaction section, and generating a DMMn crude product under the action of catalytic distillation. The two formaldehyde solutions react in different areas, and redundant water is extracted in the reaction process, so that the influence of water on the whole reaction system is reduced, the conversion rate of formaldehyde is increased, and self-polymerization of formaldehyde is avoided.

The invention discloses a phenol separation coupling catalysis purification method, and relates to the technical field of fine chemical separation and purification. According to the method, a metal oxide modified H-ZSM-5 molecular sieve is used as a catalyst, a coupling reaction and a separation process are carried out in a catalytic rectifying tower, and two core processes are synchronously completed: 1, impurities such as phenol and o-cresol in raw materials are subjected to a targeted O-alkylation reaction with methanol, and the impurities difficult to separate are efficiently converted into an alkylate easy to rectify; and 2, precise fractionation is synchronously realized, heavy ether products are extracted and removed from a side line, and target products mainly comprising high-purity 2, 6-xylenol and 2, 4-xylenol are obtained in a tower kettle. Through integrated design of targeted conversion and synchronous separation, key impurities are removed with high selectivity, the process is simplified, equipment investment and energy consumption are reduced, non-target side reactions are avoided, and high selectivity, high yield, process economy and product quality of target xylenol are considered.

The invention relates to the technical field of production of dimethyl maleate, and discloses a device and a method for preparing dimethyl maleate. Comprising the following steps: (1) introducing a first raw material containing first liquid methanol and maleic anhydride into a plate tower reactor for first reaction to obtain a first liquid-phase product; in the process system of the first reaction, the molar ratio of the cyclically refluxed methanol to the first liquid methanol is (0.2-0.5): 1; (2) introducing second liquid methanol and the first liquid-phase product into a catalytic distillation tower reactor containing a catalyst, and carrying out a second reaction to obtain a second liquid-phase product; controlling the water content in a gas phase in a catalytic distillation tower in a reaction system in which the second reaction is carried out to be not higher than 30wt% through methanol steam stripping; and (3) carrying out refining treatment on the second liquid phase product to obtain dimethyl maleate. The purity of the dimethyl maleate product obtained in one pass by the method provided by the invention can reach 99% or above.

This invention discloses a high-yield MTBE catalytic distillation apparatus, specifically relating to the field of catalytic equipment technology. It includes a base on which a collection assembly is mounted. The collection assembly includes a catalytic tank housed within the base, with an inner liner in the center of the catalytic tank. The inner liner is equipped with several separation filter covers, all used for filtration. This invention creates a separation chamber between the inner liner and the catalytic tank. Utilizing the stacked separation filter covers on the inner liner, and taking advantage of the higher boiling point of MTBE compared to the feedstock, the unreacted low-boiling-point feedstock rapidly rises to the separation chamber during distillation, while the MTBE product flows downwards after being filtered through the separation filter covers. This achieves efficient separation of the two, solving the problem of difficulty in separating MTBE from low-boiling-point feedstocks in existing technologies.

This invention provides a catalyst for the direct continuous synthesis of dimethyl carbonate from carbon dioxide and methanol, its preparation method, and its application, belonging to the field of catalyst preparation technology. The catalytically active components are firmly loaded onto the surface of a network support using a cyclic high- and low-pressure electrophoretic deposition method, forming a multi-level layered structure with alternating loose and dense layers. When used in a fixed-bed reactor or catalytic distillation reaction section, this catalyst achieves catalytic function while ensuring uniform mixing of reactants in the fixed bed, effectively improving the contact efficiency between reactants and active sites, reducing bed pressure drop, resulting in high dimethyl carbonate yield and selectivity, and also facilitating catalyst recovery and reuse.

The invention provides a continuous hydrogenation-isomerization method capable of meeting the treatment requirements of biological oil and fat, especially waste oil and fat, a homogeneous hydrogenation process with strong raw material adaptability is used as a raw material pretreatment process, and meanwhile, a high-activity nano transition metal sulfide catalyst is matched. On the basis, the long-chain alkane is selectively cracked by adopting a catalytic distillation process, so that the yield of the medium-chain and long-chain alkane is increased; an ultramicro-flow hydrogen mixer and a reduction-state non-noble metal hydroisomerization catalyst are adopted, so that the production cost of the catalyst is reduced while the hydrogen-oil ratio and the energy consumption of a circulating hydrogen system are reduced, and finally, high-efficiency and low-carbon conversion of waste grease and low-cost and high-selectivity preparation of biological aviation kerosene are realized.

The utility model relates to an MTBE (methyl tert-butyl ether) production heat recovery system which comprises an etherification reaction device, a catalytic distillation device and a reboiler arranged at the bottom of the catalytic distillation device. A first heat exchange device and a second heat exchange device are sequentially arranged on a pipeline for connecting a discharge port of the etherification reaction device and a feed port of the catalytic distillation device, and an outlet in the bottom of the catalytic distillation device is connected with a hot side inlet of the first heat exchange device through a pipeline; and a shell pass outlet of the reboiler is connected with a hot side inlet of the second heat exchange device through a pipeline. According to the MTBE production heat recovery system, the energy consumption of the catalytic distillation tower can be reduced, the production cost is reduced, and the economic benefit is improved.

The application belongs to the field of catalytic synthesis of trioxane, and particularly relates to a catalytic synthesis process and device of trioxane. The process comprises the following steps: step one, a mixture of methylal and methanol is mixed with oxygen-containing gas as raw material, and reacts to generate formaldehyde under the action of a first catalyst; step two, formaldehyde is dissolved and absorbed by water to obtain concentrated formaldehyde; step three, the concentrated formaldehyde is subjected to catalytic synthesis reaction under the action of a second catalyst to generate trioxane. The device comprises, in sequence in the feeding direction, an oxidation reactor, a heat exchanger, a formaldehyde absorption tower, a fixed bed reactor and a catalytic distillation tower; compared with pure methanol or pure methylal, the raw material of the application is easier to obtain and has lower production cost; the application obtains higher formaldehyde concentration through improved catalyst, and does not need to prepare high-concentration formaldehyde again by negative pressure concentration, so that the single-pass utilization rate of formaldehyde is improved, and various technical problems in the prior art are properly optimized.

A method for producing diisobutylene and triisobutylene based on isobutylene, first, a metal ion modified strong acid cation exchange resin is placed in a polymerization reactor and a catalytic distillation column; then fresh isobutylene raw material, a part of the reaction product output from the polymerization reactor and a part of the unreacted isobutylene output from the catalytic distillation column are jointly fed into the polymerization reactor for polymerization reaction, a part of the obtained reaction product enters the catalytic distillation column for polymerization reaction, and finally the obtained reaction product is transported to a diisobutylene rectification column, diisobutylene is obtained at the top of the column, and the bottom material is transported to a triisobutylene rectification column, triisobutylene is obtained at the top of the column. The method uses a metal ion modified strong acid cation exchange resin as a catalyst, reduces the activity of the catalyst, makes the polymerization reaction of isobutylene more easily controllable, does not need to add an inhibitor during the reaction process, saves the separation device of the inhibitor, is simple to operate, and produces triisobutylene as a byproduct while producing diisobutylene.

The invention belongs to the technical field of waste plastic resource recovery and heterogeneous catalytic distillation, and discloses a process for preparing an oil product by degrading waste plastic through molten salt distillation. Polyolefin waste plastic is used as a raw material, directional cracking of polyolefin is realized through a distillation degradation reaction under the catalysis and heat transfer synergistic effect of a molten salt system, and segmented separation of an oil product is synchronously completed. According to the process disclosed by the invention, by virtue of high-efficiency catalytic activity and excellent heat transfer performance of a molten salt system, high-efficiency degradation of the polyolefin waste plastics can be realized under relatively mild reaction conditions, and high-quality oil products can be directionally prepared; meanwhile, the preparation process of the molten salt system is simple, convenient and controllable, cyclic regeneration can be realized, the process cost is greatly reduced, and large-scale production is easy to realize. The method provides a brand new technical path for resource conversion of polyolefin waste plastics, has dual values of environmental protection treatment and resource recovery, and has an important application prospect in the fields of solid waste treatment and energy chemical industry.

The invention provides a method for preparing 1-pentene and co-producing isopentene and tert-amyl alcohol from C5 in the coal chemical industry, and relates to the technical field of comprehensive utilization of mixed C5. The method comprises the following steps: carrying out heavy component removal treatment on the coal chemical C5 fraction, carrying out light component removal treatment on the tower top fraction, mixing the tower kettle material with water and a solvent, feeding into a fixed bed filled with strong acid cation exchange resin, carrying out hydration reaction, rectifying the hydration product, and introducing the tower top material into a catalytic distillation tower filled with a double-bond isomerization catalyst, a material rich in 2-methyl-2-butene is obtained from the tower kettle, 2-methyl-2-butene is obtained through rectification, the tower kettle material obtained after the hydration product is rectified is subjected to azeotropic rectification, an entrainer and tert-amyl alcohol on the upper layer participate in reflux, and tert-amyl alcohol and a solvent are obtained from the tower kettle. According to the method disclosed by the invention, three products of 1-pentene, isopentene and tert-amyl alcohol can be obtained at one time, the price of the used catalyst is low, the reaction conditions are mild, and qualified products can be obtained by adopting a common distillation mode for most of the products.

The invention discloses a production device and a production process of dimethyl maleate. The production device comprises a monomethyl ester reactor, a dimethyl ester reactor and a catalytic distillation depth reactor, maleic anhydride and methanol are firstly mixed and then enter a monomethyl ester reactor, maleic anhydride generates monomethyl maleate in the monomethyl ester reactor, then an outlet material of the monomethyl ester reactor and supplemented methanol are mixed and then enter a dimethyl ester reactor, most of monomethyl maleate is converted into dimethyl maleate in the dimethyl ester reactor, and the dimethyl maleate is converted into dimethyl maleate in the dimethyl ester reactor. An outlet material of the dimethyl ester reactor enters the upper part of the reaction section of the catalytic distillation deep reactor, supplemented methanol is supplemented from the lower part of the reaction section of the catalytic distillation deep reactor, the separation of methanol and ester is completed in the stripping section of the catalytic distillation deep reactor, the methanol at the tower top is recycled after being recovered, and in the reaction section, monoester is in contact with rising methanol; monoester is converted into diester, the diester flows out of a tower kettle, and the diester is purified to be used as a raw material of a subsequent processing procedure.

This application discloses a hydrogenation apparatus and method for producing isooctane from blended oil, belonging to the field of petrochemical technology. The apparatus includes: a catalytic distillation hydrogenation tower, a condenser, a reflux tank, a reboiler, a first compressor, and a hydrogenation reactor. The top of the catalytic distillation hydrogenation tower is connected to the condenser; the condenser is connected to one inlet of the reflux tank; one outlet of the reflux tank is connected to the first compressor; and the other outlet is connected to the catalytic distillation hydrogenation tower. A reboiler is located at the bottom of the catalytic distillation hydrogenation tower; the bottom of the hydrogenation reactor is connected to the catalytic distillation hydrogenation tower. Thus, this application can saturate the olefins in the blended oil, thereby meeting its requirements as a blending component for automotive gasoline and producing isooctane as needed. Furthermore, by separately hydrogenating different components in the blended oil through the catalytic distillation hydrogenation tower and the hydrogenation reactor, equipment and operating costs can be reduced, achieving energy saving and flexible operation.

The present invention discloses a catalytic distillation device and application for recovering heat from raw coal gas and pre-treating coal tar. The device comprises a catalytic distillation tower; a raw coal gas mechanical impurity scrubbing zone at the bottom of the catalytic distillation tower; a suspended bed catalytic distillation zone in the middle of the catalytic distillation tower; at least one liquid material outlet is provided in the middle of the catalytic distillation zone from bottom to top. The liquid material outlet is connected to a heat exchanger via a pipeline. After cooling in the heat exchanger, the material is connected to the upper reflux port and an external discharge line of the catalytic distillation tower via a pipeline; the upper reflux port of the catalytic distillation tower is connected to an oil-soluble suspended bed hydrogenation catalyst addition device; and a gaseous material outlet is provided at the top of the catalytic distillation tower. The device of the present invention can simultaneously recover heat from high-temperature raw coal gas and effectively pre-treat coal tar, laying the foundation for subsequent processing.

The utility model relates to a device for improving the heat exchange efficiency of a feeding preheater of a C4 reaction unit. According to the technical scheme, an outlet of a feeding C4 filter is connected to a shell pass inlet of a catalytic distillation tower top cooler, a shell pass outlet is connected to a tube pass inlet of a reaction efficient heat exchanger, a tube pass outlet is connected to an inlet of an isomerization heating furnace, and an outlet is connected to an inlet of an isomerization reactor; the outlet is connected to a shell pass inlet of the efficient reaction heat exchanger through a pipeline, and a shell pass outlet of the efficient reaction heat exchanger is connected to a shell pass inlet of the reactor discharging heat exchanger through a pipeline. The device has the beneficial effects that the reaction product material at the outlet of the isomerization reactor is sent to the shell pass of the high-efficiency reaction heat exchanger for heat exchange with the feeding raw material, and the reaction product cooled by the high-efficiency reaction heat exchanger is sent to the reactor discharging heat exchanger for continuous circulating heat exchange and cooling operation, so that the heat is recycled; the inlet temperature of the isomerization heating furnace is increased, and the production and operation cost is reduced.

The invention discloses a process for preparing methylal from methanol and a formaldehyde aqueous solution, the process combines a multi-stage catalytic extraction process and a catalytic rectification process, an extraction agent does not need to be completely separated from a product, and the process has the advantages that the raw material cost is low, the product separation is easy, the product scheme is flexible, the product methylal does not contain methanol, and the like. The method comprises the following steps: introducing raw materials formaldehyde and methanol into a multistage catalytic extraction reaction system (CE system), carrying out countercurrent contact with an extraction agent, and carrying out catalytic reaction and extraction alternately for multiple times to obtain an extraction phase material C and a raffinate phase material D; the material C is washed with water to remove formaldehyde and methanol, then rectification separation is carried out, methylal is separated out or part or all of OME2 is further separated out, and other components are returned to a CE system together with the extraction agent for recycling. The water washing liquid returns to the CE system for continuous reaction. The material D enters a catalytic rectifying tower, methylal, unreacted methanol, formaldehyde and a small amount of water are extracted from the tower top, and the methylal, the unreacted methanol, the formaldehyde and the material C are washed and separated together; wastewater is discharged from the tower bottom.

A method and apparatus for catalytic distillation is disclosed. Embodiments may include a catalytic distiller including a pressure vessel; a reactive distillation device positioned in the pressure vessel including a distillation device and a fixed bed catalyst device positioned above the distillation device, wherein the fixed bed catalyst device includes a fixed bed catalyst component and a vapor riser; and flood prevention system to collect and direct a liquid from the fixed bed catalyst component through a fixed bed bypass pipe to the distillation device, wherein the fixed bed bypass pipe, which is connected to the pressure vessel, is positioned outside of the pressure vessel.

The invention belongs to the field of catalytic synthesis of trioxymethylene, and particularly relates to a catalytic synthesis process and device of trioxymethylene. The process comprises the following steps: step 1, mixing a mixture of methylal and methanol as a raw material with oxygen-containing gas, and reacting under the action of a first catalyst to generate formaldehyde; 2, formaldehyde is dissolved and absorbed by water, and concentrated formaldehyde is obtained; and 3, carrying out a catalytic synthesis reaction on the concentrated formaldehyde under the action of a second catalyst to generate trioxymethylene. The device comprises an oxidation reactor, a heat exchanger, a formaldehyde absorption tower, a fixed bed reactor and a catalytic distillation tower which are sequentially connected along a feeding direction, compared with pure methanol or pure methylal, the raw materials are easier to obtain, and the production cost is lower; by improving the catalyst, the concentration of the obtained formaldehyde is higher, and the high-concentration formaldehyde is prepared without negative pressure concentration, so that the one-way utilization rate of the formaldehyde is improved, and various technical problems in the prior art are properly optimized.

The invention discloses a method for producing cyclic carbonate through heterogeneous catalytic distillation, and belongs to the technical field of carbonate preparation. The method comprises the following steps: filling a heterogeneous catalyst into a catalytic rectifying tower in the form of a filler, taking dihydric alcohol and dimethyl carbonate as raw materials, reacting in the catalytic rectifying tower to generate methanol and cyclic carbonate, and forming azeotrope by the generated methanol and dimethyl carbonate, so that the reaction and separation are synchronously performed, and the generation of cyclic carbonate is promoted; carrying out high-pressure rectification and normal-pressure rectification separation on the azeotrope to obtain methanol and excessive dimethyl carbonate; the reaction rectification product is subjected to dimethyl carbonate recovery, dihydric alcohol recovery and separation to obtain the product, and the purity can reach 99.99% or above. The continuous production of cyclic carbonate is realized, the conversion of dihydric alcohol is improved through the circulation of dimethyl carbonate, the utilization rate of dihydric alcohol can reach 99% or above, and the process can be stably operated for a long time.