23 results about "Catalytic distillation" patented technology

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 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 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.

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.

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.

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 application discloses a novel sec-butyl acetate production device and production process, and relates to the technical field of organic chemical industry and chemical process technology. The application takes a catalytic distillation tower as a core, integrates a two-section esterification reactor, a C4 deacidification tower, an azeotropic distillation tower, a sec-butyl acetate product tower and a de-acetic acid tower, and adopts a solid acid catalyst to reduce corrosion and pollution, utilizes catalytic distillation to strengthen reaction balance, improves conversion rate, optimizes tower operation conditions, simplifies a process and reduces energy consumption, realizes efficient, clean and low-cost production of sec-butyl acetate, and meets the increasing demand of the market for environment-friendly solvents.

The utility model relates to the technical field of catalytic distillation tower top condensers, in particular to a catalytic distillation tower top condenser convenient to disassemble and clean, which comprises a tube box with a heat exchange tube fixedly mounted at one end and a shell pass cylinder sleeved outside the heat exchange tube and detachably connected with the tube box, the tube box is provided with a linear feeding moving mechanism for driving the shell pass barrel to perform feeding motion towards the tube box side, and the end part, close to the tube box side, of the shell pass barrel is provided with an annular spraying mechanism and is matched with a cleaning liquid supply mechanism for supplying liquid to the annular spraying mechanism. And cleaning liquid is sprayed to the heat exchange tubes in the separation process, so that the stability and efficiency of disassembly and cleaning are improved.

The selective dimerization of isoolefins such as isobutylene or isopentane or mixtures thereof can be carried out in a system comprising a series of fixed bed reactors and catalytic distillation reactors. The system can pass the fixed bed reactor effluent to the downstream reactors without intermediate separation of the desired product from unreacted components. It has been found that high selectivity to dimers can be achieved even without intermediate separation of the desired product from unreacted components between reactors. In addition, embodiments provide for the use of a partitioned wall column to recover high purity dimer product, thereby reducing unit element count and site size.

The utility model relates to catalytic distillation reflux tank technical field, concretely for a kind of discharging device for catalytic distillation reflux tank, including the discharging tank that top can be communicated with the discharging port of catalytic distillation reflux tank, the bottom of discharging tank is fixedly connected with the discharging pipe and reflux pipe of being separately arranged in two sides, the inner bottom of discharging tank is rotatably connected with the adjusting cylinder that is sealed sliding fit with discharging tank inner side wall, the bottom of adjusting cylinder is circumferentially provided with the discharging pass-through of being communicated with discharging pipe and reflux pipe, when any one of discharging pipe and reflux pipe and one discharging pass-through are completely penetrated, the utility model is convenient for the flow rate ratio of quick backflow and discharging, and adjustment is more convenient.

The utility model relates to the technical field of catalytic distillation, and provides a novel catalytic distillation module, which comprises a structured packing assembly and a catalyst, the structured packing assembly is formed by alternately stacking a plurality of structured packing, two adjacent structured packing form a hollow channel, and the catalyst is in bulk in the hollow channel of the whole structured packing assembly. The structured packing comprises a first pore plate, a second pore plate and a metal wire mesh which are sequentially connected, and the first pore plate, the metal wire mesh and the second pore plate are tightly attached and pressed into a corrugated plate shape. The pressure drop of the distillation tower is not increased while the high filling amount is ensured, and the reaction air speed can be adjusted in a large range.

This invention discloses a catalytic synthesis process for methyl tert-butyl ether, belonging to the field of etherification catalytic synthesis technology. The main raw materials are methanol and pre-ether C4. By introducing mesoporous silica in situ into a strongly acidic cation exchange resin and loading sulfonic acid imidazole trifluoromethanesulfonate ionic liquid into the ion exchange resin, a composite catalyst with a multi-level pore structure is formed, thereby significantly improving the utilization rate of acidic sites inside the catalyst. The resulting modified catalyst can be used in the etherification reaction of methyl tert-butyl ether and subsequent catalytic distillation process, so that the reaction equilibrium continuously shifts towards the product, thereby improving the overall conversion rate of the etherification reaction. This process also improves the raw material conversion rate and product purity through the synergistic effect of reaction and separation, and realizes the recycling of raw materials by combining a methanol recovery system. This process has high reaction efficiency, good catalyst stability, and is suitable for large-scale industrial continuous production.

Disclosed in the present application is a method for removing oxygen-containing compounds from Fischer-Tropsch light distillates by means of catalytic distillation. In the present invention, oxygen-containing compounds in Fischer-Tropsch light distillates are initially removed by means of a catalytic distillation column; a crude deoxygenated product is extracted from the top of the catalytic distillation column and enters a fixed-bed adsorption column to undergo deep removal, so as to obtain a product having an oxide content of less than 1 μg / g; and the bottom liquid of the catalytic distillation column is recycled and intermittently regenerated. In the present invention, oxygen-containing compounds in Fischer-Tropsch light distillates are converted, by means of the coupling of reaction and separation, into components having boiling points largely different from those of alkanes and olefins, thereby achieving the aim of separating alkanes and olefins from the oxygen-containing compounds, and also reducing energy consumption and equipment costs.

The invention relates to the technical field of coal chemical industry, in particular to a method and a device for co-producing high-purity MTBE (Methyl Tert-Butyl Ether) and 1-butene by taking isobutene-poor mixed C4 as a raw material. The method mainly comprises the steps of etherification reaction, product separation and shunting, 1-butene refining and isomerization enrichment and circulation. Through heterogeneous enrichment and circulation, the effective concentration of isobutene entering the MTBE unit is remarkably improved, and the purity of the MTBE product is larger than or equal to 98%. Meanwhile, a 1-butene refining unit is optimized, and 1-butene with the purity being greater than or equal to 99.3% can be stably produced. According to the present invention, the low-value 2-butene is effectively utilized, the economic value of the raw material is improved, the etherification unit, the catalytic distillation unit, the separation unit, the isomerization unit and other units are integrated, the heat exchange network is optimized, and the energy consumption and the carbon emission are reduced.

The utility model relates to the technical field of catalytic rectification, in particular to heterogeneous catalytic rectification equipment, which comprises a rectifying tower, fences, a protective frame, a tower tray, a redistributor, a spray pipe and a filler component, the outside of the rectifying tower is connected with a plurality of groups of fences, and the protective frame is connected to the outside of the rectifying tower close to the upper part. The lower part in the rectifying tower is connected with a filler assembly, the upper part in the rectifying tower is provided with a plurality of groups of tower trays, a spraying pipe is connected to the position, close to the upper part of the filler assembly, in the rectifying tower, a redistributor is connected to the position, close to the upper part of the spraying pipe, in the rectifying tower, and a plurality of groups of bubble caps are arranged in the middles of the upper ends of the tower trays; overflow weirs are arranged on the two sides of the upper end of the tower tray, a liquid receiving tray is arranged on one side of the upper end of the tower tray, a downcomer is arranged on the side, away from the liquid receiving tray, of the lower end of the tower tray, a liquid inlet connector is arranged at one end of the spraying pipe, and the filler assembly is composed of filler, a catalyst box and a mounting frame.

This invention discloses an Alg / PVA-based single-atom hydrogel catalytic distillation membrane, its preparation method, and its application, belonging to the field of membrane distillation technology. The preparation method of the Alg / PVA-based single-atom hydrogel catalytic distillation membrane of this invention includes the following steps: uniformly coating a mixed hydrogel precursor solution of sodium alginate, polyvinyl alcohol, and phytic acid onto the surface of a hydrophilically modified hydrophobic microporous membrane, and then wetting and crosslinking it using a transition metal ion crosslinking solution to obtain the Alg / PVA-based single-atom hydrogel catalytic distillation membrane. The Alg / PVA-based single-atom hydrogel catalytic distillation membrane prepared by this invention can exhibit excellent performance in removing volatile organic compounds without sacrificing the permeation flux of the original hydrophobic base membrane, and also demonstrates excellent long-term stability in actual seawater.

A method for producing gasoline blending components, the obtained gasoline blending components and a reaction device, light hydrocarbon raw materials enter a catalytic distillation column, so that 5-20% of benzene and naphthenes in the light hydrocarbon raw materials enter the light hydrocarbon isomerization reaction section to undergo isomerization reaction, and then are separated through a rectification section, C5 alkanes and multi-methyl C6 isomeric alkanes are obtained at the top; the side line discharge enters an aromatization reaction zone to undergo aromatization reaction, and the reaction product of the aromatization reaction zone is used as a circulating material; 80-95% of benzene and naphthenes in the light hydrocarbon raw materials and other heavy components enter a naphthenic isomerization reaction zone to undergo benzene saturation and naphthenes isomerization reaction, and then the liquid phase product obtained after gas-liquid separation of the reaction stream is mixed with the top discharge of the catalytic distillation column to obtain high-octane gasoline blending components. The method provided by the application reduces the benzene content of the obtained gasoline blending components, increases the yield of naphthenes, and the octane number of the gasoline blending components is high.