1096 results about "Tube reactor" patented technology

The invention discloses a method for continuously producing fluorobenzene, which comprises the following steps: S10) mixing anhydrous hydrogen fluoride and aniline in a tubular reactor to obtain an aniline hydrofluoride mixture; s20) introducing the aniline hydrofluoride mixture into a venturi tube reactor in an inert gas atmosphere, sucking powdered and dried sodium nitrite into the venturi tube reactor in a negative pressure environment formed by the venturi tube reactor, and carrying out a synthetic reaction to obtain a diazonium solution; s30) transferring the diazonium solution into a tubular reactor for pyrolytic reaction to obtain a crude fluorobenzene solution; s40) refining the crude fluorobenzene raw material to obtain fluorobenzene; according to the method disclosed by the invention, the crossing from an intermittent artificial kettle reaction to a continuous reaction is realized, the reaction is sufficient and complete, no 70% hydrofluoric acid mother liquor, no 70% sulfuric acid waste liquor, no high-concentration wastewater and no yellow mud solid waste are produced, a high-quality fluorobenzene product can be continuously prepared in a large batch, and the method has good economic and environmental benefits and a wide market application prospect.

The invention relates to the technical field of guanidine nitrate preparation, in particular to a method for preparing guanidine nitrate by a continuous dynamic tubular reaction process, which comprises the following steps: uniformly mixing dicyandiamide, target ammonium nitrate and target ammonium carbonate according to a mass ratio of 1: (1-3): (1-0.5); conveying the uniformly mixed material to a feeding section in a dynamic tubular reactor through a first conveying screw rod for mixing treatment, wherein the dynamic tubular reactor further comprises a heating section, a reaction section and a cooling section; sequentially conveying the target mixed material to a heating section for heating melting treatment, a reaction section for synthesis reaction treatment and a cooling section for cooling forming treatment through a second conveying screw rod to obtain an initial product; conveying the initial product into a cooling and crushing device for cooling and slicing to obtain a target guanidine nitrate product. According to the method disclosed by the invention, the mass and heat transfer efficiency can be improved, the online quantity and liquid holdup of the material are reduced, meanwhile, the raw material ratio and the reaction path are optimized, and the safety and the product purity are improved.

The invention discloses a continuous production process of a CO2-based multipolymer, and belongs to the technical field of polycarbonate synthesis. The technological process comprises the following steps: firstly, preparing an auxiliary agent, a solid-state monomer, a liquid-state reaction monomer and any solvent into a mixed solution in a premixer (1); continuously feeding carbon dioxide and the mixed solution into a multi-stage continuous reactor for mixing and heating to initiate a reaction, wherein the total reaction residence time of the materials in the multi-stage continuous reactor is controlled to be 10 minutes to 5 hours; and after the reaction is completed, carrying out post-treatment to complete the continuous production of the CO2-based multipolymer. The process particularly optimizes the effective continuous polymerization of high-molecular and high-viscosity materials of the CO2-based multipolymer. Through accurate control of the multi-stage tubular reactor, appropriate reaction viscosity is realized, further reaction uniformity of materials in the screw extrusion reactor is ensured, and reaction efficiency is improved.

The invention discloses a rapid tubular induced crystallization reaction process and device for fluorine-containing wastewater, the device comprises a tubular reactor, a crystal sedimentation tank and crystal dehydration equipment, the fluorine-containing wastewater is pumped from a water inlet at one end of the tubular reactor, calcium liquid is pumped from dosing ports at intervals on the tubular reactor along the flowing direction of the wastewater at a set flow rate, and the calcium liquid is pumped from the dosing ports at intervals along the flowing direction of the wastewater; the fluorine-containing wastewater reacts with a calcium agent in the tubular reactor to generate calcium fluoride crystals with the particle size range of 10-80 microns, a mixture is discharged into a crystal sedimentation tank through a water outlet in the other end of the tubular reactor, clear water is discharged from a water outlet in the upper portion of the crystal sedimentation tank, and crystal slurry sinking to the bottom of the crystal sedimentation tank is pumped into a cyclone separator through a crystal discharging pump; large-particle crystals discharged from an outlet in the lower end of the cyclone separator are collected by a crystal collection pool and are regularly discharged into crystal dehydration equipment for dehydration, small-particle crystals discharged from an outlet in the upper end of the cyclone separator flow back to the water inlet end of the tubular reactor, the reactor is small in size and low in investment, and the stability of the calcium fluoride crystal product quality is guaranteed.

The invention belongs to the technical field of chemical production, and particularly relates to a channelized continuous synthesis method of polyvinyl siloxane microspheres and a used device. The continuous channelization device comprises a channelization reactor I and a channelization reactor II, the channelization reactor I and the channelization reactor II are both multi-side-line feeding tubular reactors. The invention also provides a channelized continuous synthesis method of the polyvinyl siloxane microspheres. The method comprises the following steps: carrying out hydrolysis reaction on vinyltrimethoxysilane and a hydrochloric acid solution in a channelized reactor I; primary reaction liquid flowing out of the channelization reactor I and aqueous alkali are subjected to condensation polymerization in a channelization reactor II; the ultimate reaction liquid flowing out of the channelization reactor II enters a collecting tank and is subjected to post-treatment, and the polyvinyl siloxane microspheres are obtained.

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention provides a continuous production method and device for long-chain alkyl phenyl modified silicone oil with accurate and controllable viscosity. The continuous production method of the long-chain alkyl phenyl modified silicone oil is characterized by comprising the following steps: step 1, reacting hydrogen-containing silicone oil and a styrene monomer in a microchannel reactor to obtain a first reactant; and step 2, further reacting the first reactant with long-chain carbene in a dynamic tubular reactor to obtain the long-chain alkyl phenyl modified silicone oil.

The invention relates to a reactor (2) for generating hydrogen and at least one other product from at least one reactant, the reactor comprising a tubular reactor vessel (4) which contains a catalyst (6) in the form of a ceramic bed. Improved corrosion resistance against a variety of media and thus an increased service life of the reactor (2) is achieved by forming the reactor vessel (4) from silicon-infiltrated silicon carbide (SiSiC).

The present invention discloses a microwave continuous frequency modulation collaborative biomass directional depolymerization device and its usage method, belonging to the technical field of biomass resource utilization. The device includes a microwave continuous frequency modulation power supply, a microwave resonant cavity, a quartz tube reactor, and a product treatment device; a microwave feed port is provided on the microwave resonant cavity, and the microwave continuous frequency modulation power supply is connected to the microwave feed port; the quartz tube reactor is connected to an inert gas source, a biomass feed hopper is connected to the quartz tube reactor, a catalyst filling screen spacer is provided in the middle, an infrared thermal imager is provided above, and an infrared thermometer is provided at the catalyst filling screen spacer; the product treatment device includes a condensation system and a gas collection bag, the condensation system is arranged at the outlet of the quartz tube reactor, and the gas collection bag is arranged at the outlet of the condensation system. The present invention matches the microwave emission frequency with the intrinsic resonance frequencies of the three major components of biomass and the catalyst to achieve the goal of reducing the biomass cracking activation energy and realizing directional depolymerization.

The invention relates to an interfacial polycondensation tubular reactor for preparing polycarbonate, which is characterized in that a U-shaped structure is adopted, a spiral turbulent flow device is arranged in a straight pipe section, and a high-viscosity melt is disturbed, laminar flow is eliminated and mixing is enhanced in an active or passive mode; a multi-stage independent temperature control module is arranged outside, so that the temperature of each reaction section is accurately regulated and controlled. The inlet, the outlet and the temperature control interface of the reactor adopt high-temperature-resistant and corrosion-resistant sealing design, and U-shaped modular flange connection is convenient for disassembly, assembly, cleaning and continuous expansion. The design solves the problems of non-uniform heat transfer and material residue of a traditional horizontal disc reactor, poor flow distribution of a tubular reactor and the like, and has the following advantages: the melt flow uniformity is improved, and local overheating and excessive polycondensation are avoided; the reaction efficiency and molecular weight distribution are optimized through segmented temperature control; the structure is compact without dead angles, the side reaction and inner wall corrosion risks are reduced, and the device is suitable for efficient continuous synthesis of polycarbonate.

The invention discloses a high-purity fluorobenzene recovery process in 1, 4-bis (4-fluorobenzoyl) benzene production, and belongs to the technical field of organic waste liquid recovery, the process comprises the following steps: 1, enabling fluorobenzene waste liquid to pass through a tubular reactor filled with anhydrous aluminum chloride particles to react to obtain dewatered fluorobenzene waste liquid, the reaction temperature is 5-40 DEG C, the retention time is 60-200min, and the flow velocity of the fluorobenzene waste liquid is 0.1-0.4 m / min; 2, the water-removed fluorobenzene waste liquid is filtered through a micron filter and then enters a fluorobenzene rectifying tower to be rectified, organic steam on the tower top is compressed through a compressor, subjected to heat exchange through an MVR heat exchanger and condensed and then enters a reflux tank to be refluxed, high-purity fluorobenzene is extracted from the fluorobenzene rectifying tower, the purity of the fluorobenzene is larger than 99.99 wt%, and the mass content of water is smaller than 10 ppm. The fluorobenzene waste liquid in the production process of 1, 4-bis (4-fluorobenzoyl) benzene is used as a raw material, continuous batch production of high-purity fluorobenzene is achieved through reaction dehydration, crystalline aluminum chloride filtration and rectification, the process is simple, and energy consumption is low.

The invention provides a method for continuously synthesizing 2-thiophenecarboxaldehyde by using a continuous flow reactor, and relates to the technical field of organic synthesis, and the method comprises the following steps: mixing thiophene and N, N-dimethylformamide (DMF) to form a material A; continuously inputting the material A and phosphorus oxychloride (POCl3) into a micro-channel continuous flow reactor through a high-pressure feeding pump, and controlling the reaction temperature to be 60-150 DEG C and the retention time to be 0.5-5 minutes; synchronously inputting the reaction liquid output by the micro-channel reactor and a sodium hydroxide aqueous solution into a dynamic tubular reactor, and carrying out hydrolysis reaction at 10-70 DEG C for 0.5-5 minutes; according to the method, the 2-thiophenecarboxaldehyde is obtained by extracting the 2-thiophenecarboxaldehyde by using dichloromethane (DCM), and a continuous flow reactor technology is adopted, so that the reaction efficiency is remarkably improved. Compared with the traditional batch reaction, the continuous flow reactor has higher mass transfer and heat transfer efficiency, can realize rapid reaction, shortens the reaction time, and improves the product yield at the same time.

The invention discloses a tubular reactor and a high-temperature chlorination treatment device.The tubular reactor comprises a rotatable first tube body, a gas supply assembly, a material supply assembly and a heating assembly, the feeding end of the first tube body is higher than the discharging end, and the first tube body is provided with at least two reaction areas; each reaction area extends from the feeding end of the first pipe body to the discharging end of the first pipe body; the gas supply assembly is configured to supply chlorinated gas to each reaction area; the feeding assembly is configured to provide quartz sand raw materials for each reaction area; the heating assembly is configured to heat all the reaction areas; when the first pipe body rotates, the quartz sand raw materials in each reaction area roll in the respective reaction area, so that the quartz sand raw materials in each reaction area are in full contact with the chlorinated gas. The tube reactor can greatly increase the use volume of the tube body and improve the purification efficiency; and moreover, the mixing uniformity of the quartz sand raw material and the chlorinated gas can be improved, and the dosage of the chlorinated gas is greatly reduced.

The invention provides a method and a system for performing exothermic reaction by using a tubular reactor. The method comprises the following steps: S1, carrying out an exothermic reaction on a part of a reaction raw material A and a reaction raw material B in tubes of a tubular reactor to obtain a reaction product C; s2, enabling the other part of the reaction raw material A to enter a shell pass of a tubular reactor to perform first heat exchange with the reaction product C; according to the method and the system, the energy consumption required by the exothermic reaction can be greatly reduced, the cost is saved, meanwhile, the heat exchange effect at the blind area of the baffle plate can be improved, the temperature runaway phenomenon in the tube nest is avoided, and the safety and the stability of the exothermic reaction are greatly improved.

The utility model discloses a tubular reactor for synthesis of electronic grade chemicals, and particularly relates to the technical field of tubular reactors, the tubular reactor comprises a reaction tube, the left side of the reaction tube is fixedly connected with a connecting flange, an inner cavity of the reaction tube is provided with a stirring assembly, and the right part of the outer surface of the reaction tube is fixedly connected with a through connecting tube; a ball valve is fixedly connected to the upper end of the connecting pipe, a circular shell is fixedly connected to an upper side port of the ball valve, a through water inlet pipeline is fixedly connected to the left side of the outer surface of the circular shell, and a rolling assembly is arranged on the inner surface of the circular shell. According to the tubular reactor for synthesizing the electronic-grade chemicals, disclosed by the utility model, the arranged rolling assembly can be used for rolling a solid substance into powder before the solid substance is added into the reaction tube and reacts with a liquid substance, so that the solid substance can be better fused with the liquid substance after entering the reaction tube.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing caprolactone, in particular to a method for continuously preparing caprolactone. The method comprises the following steps: (1) mixing a peroxy acid synthesis solution containing an acidic catalyst with a stabilizer which is a nitrogen-containing alkaline compound and has lone pair electrons on an N atom; and (2) respectively inputting cyclohexanone and the mixed solution obtained in the step (1) into a microreactor to carry out a first reaction, and then introducing a product obtained by the first reaction into a tubular reactor to carry out a second reaction. By adopting the method for preparing the caprolactone, the stability and safety of the reaction can be improved, meanwhile, the conversion rate of the cyclohexanone is increased, the conversion rate of the cyclohexanone is 99.5% or above, and the selectivity of the prepared caprolactone is gt; the content is 99.5%.

The invention discloses a U-shaped wall tubular reactor and an application method thereof. The reactor comprises a shell, the top of the shell is provided with a synthesis gas inlet, the bottom of the shell is provided with a synthesis gas outlet, the shell is internally provided with a gas distributor, a central gas collection cylinder and a water-cooling bundling pipe, and the outer side of the shell is provided with an upper annular cavity and a lower annular cavity; the gas distributor is arranged in the synthesis gas inlet, the central gas collection cylinder is arranged at the central part of the shell, and the water-cooling bundling pipe is arranged on the outer side of the central gas collection cylinder and consists of a plurality of U-shaped heat exchange pipes; the upper ends of all the U-shaped heat exchange tubes penetrate through the upper tube plate to be communicated with the upper annular cavity, the lower ends of all the U-shaped heat exchange tubes penetrate through the lower tube plate to be communicated with the lower annular cavity, and the upper tube plate and the lower tube plate are both arranged on the side wall of the shell. The welding seam of the heat exchange tube is not in contact with process gas, so that the corrosion problem is thoroughly solved; no internal part structure is arranged in the shell, so that the uniform distribution of reaction gas in a catalyst bed layer is improved, and the ammonia synthesis efficiency is improved. The reactor can be used for fixed bed ammonia synthesis reaction or water gas shift reaction.

The invention relates to a low-softening-point spinnable mesophase pitch and a continuous production process thereof, and belongs to the technical field of pitch-based carbon materials. The technical problems of low purity, high softening point, non-uniform structural composition, high production cost and the like of the mesophase pitch prepared by a process for producing the mesophase pitch from aromatic hydrocarbon-rich heavy oil in the prior art are solved. According to the continuous production process disclosed by the invention, coal-based or petroleum-based aromatic hydrocarbon-rich heavy oil is taken as a raw material, raw oil refining is realized through a continuous solvent extraction process, and shallow polycondensed asphalt is prepared by adopting a multi-section heating tubular reactor through a thermal polycondensation process; then the pitch is subjected to a supercritical or subcritical extraction process at a certain temperature and pressure to obtain the mesophase pitch with enriched polycyclic aromatic hydrocarbon molecules with low softening point, narrow molecular weight distribution and uniform structural composition, and the mesophase pitch has excellent spinning performance, so that the prepared carbon fiber has excellent mechanical properties and is suitable for industrial production. The high-value utilization of the aromatic hydrocarbon-rich heavy oil is realized.

The invention discloses a hexamethyldisiloxane preparation method capable of purifying a raw material, and relates to the technical field of chemical preparation, the hexamethyldisiloxane preparation method capable of purifying the raw material comprises the following steps: S1, raw material preparation: cooling deionized water through a cooling system, and maintaining the temperature to be less than or equal to 10 DEG C, then injecting part of the cooled deionized water into a tubular reactor, pumping trimethylchlorosilane and methylbenzene into a premixing tank according to a proportion, and uniformly stirring and mixing; s2, catalytic promotion: injecting diluted hydrochloric acid into the tubular reactor, uniformly mixing the diluted hydrochloric acid with deionized water, and maintaining the pH value to 2-3; according to the hexamethyldisiloxane preparation method capable of purifying the raw materials, redundant steps such as catalyst recovery and repeated washing can be omitted through the hydrolysis reaction, the method is suitable for continuous production, meanwhile, the process of the hydrolysis reaction is optimized by changing the use steps and the input method of the deionized water, and the stability in the preparation process is further maintained.

The utility model belongs to the technical field of ethylene glycol preparation, and particularly relates to an esterification purge gas treatment device in a process of preparing ethylene glycol from synthesis gas, which comprises an MN recovery tower, a gas mixer, a tail gas heater, a tail gas reactor, a cooler and a tail gas absorption tower, tower top outlet gas of the MN recovery tower and purge gas from PSA desorption gas of a hydrogenation unit enter a gas mixer, are mixed in the gas mixer, then enter a tail gas heater to be heated and then enter a tail gas reactor to react, an outlet of the tail gas reactor is connected with an inlet of a cooler, an outlet of the cooler is connected with a tail gas absorption tower, and an outlet of the tail gas absorption tower is connected with an outlet of the MN recovery tower. The tail gas absorption tower is connected with a spray water inlet pipe and a waste gas discharge pipe; and the tail gas reactor is a fixed tubular reactor. According to the device, nitrogen oxide which cannot be directly discharged in esterification purge gas can react to generate harmless gas such as nitrogen and nitrogen dioxide, environmental pollution is avoided, the device can adapt to the shutdown working condition of an esterification system, air does not need to be supplemented to the MN recovery tower, and the technological operation risk is reduced.

The tubular reactor provided by the invention comprises a reactor body, the tube body assembly is located in the reactor body and comprises a tube nest and a sleeve which are arranged in a matched mode, the tube nest is used for installing an oxygen carrier, the sleeve is arranged on the tube nest in a sleeving mode, and open holes are formed in the tube nest; the sealing assembly comprises a first sealing structure and a second sealing structure; the first sealing structure and the second sealing structure are arranged in the reactor body and are in sealing connection with the inner side wall of the corresponding position of the reactor body; the tube nest and the sleeve respectively penetrate through the first sealing structure and the second sealing structure; a gas inlet and a gas outlet are respectively formed in two ends of the reactor body, two ends of the tube nest are respectively communicated with the gas inlet and the gas outlet, and the top end of the sleeve is communicated with the gas outlet device; a liquid inlet and a liquid outlet are further formed in the side surfaces of the two ends of the reactor body and are positioned between the first sealing structure and the second sealing structure. The direct heat exchange between a coolant and an oxygen carrier can be avoided, so that the influence on the temperature of the oxygen carrier is reduced.

The invention discloses a tubular continuous flow preparation process and a tubular continuous flow preparation device for (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. A hydroquinone aqueous solution and a sodium hydroxide solution are respectively preheated and mixed, and then enter a tubular reactor I for reaction to obtain a hydroquinone sodium alkaline solution. And pumping (S)-(-)-2-methyl chloropropionate into a reaction system, respectively preheating the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution obtained in the previous step, mixing the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution, carrying out nucleophilic substitution reaction in a tubular reactor II, and carrying out post-treatment on the reaction completion solution to obtain the high-purity (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. According to the method, an optimization method combining a tubular reaction technology and kinetic research is adopted, and MATLAB simulation and experimental verification are combined, so that the reaction yield reaches 95% or above, and the purity reaches 99% or above; the method is high in reaction controllability, fully continuous in reaction process, convenient to operate, low in cost and suitable for industrial production, and the use amount of hydroquinone is greatly reduced.

The invention discloses a continuous synthesis coordinated temperature control integrated method of fluorobenzene. The method comprises the following steps: carrying out salt-forming exothermic reaction on hydrogen fluoride liquid and aniline liquid in a salt-forming tubular reactor to obtain aniline hydrofluoride; carrying out diazotization exothermic reaction on aniline hydrofluoride and sodium nitrite solid in a diazotization tubular reactor to obtain diazonium salt; performing multi-stage pyrolysis exothermic reaction on the diazonium salt in a multi-stage temperature control tubular reactor to obtain pyrolysis liquid; performing liquid-liquid centrifugal separation on the pyrolysis liquid to continuously obtain a fluorobenzene product; thermal coupling heat exchange channels are respectively arranged among a sodium nitrite solid feeding pipeline, a diazonium salt feeding pipeline, an aniline hydrofluoride feeding pipeline, a diazotization tubular reactor, a hydrogen fluoride liquid feeding pipeline, liquid-liquid centrifugal separation equipment, an aniline liquid feeding pipeline, a salifying tubular reactor and a multi-stage temperature control tubular reactor, so that heat transfer temperature control is realized; according to the invention, continuous synthesis of fluorobenzene and temperature control integrated control are realized, and batch continuous stable production of fluorobenzene is further promoted.

The invention discloses a single-walled carbon nanotube collecting device, which relates to the related technical field of carbon nanotube preparation, is used for collecting single-walled carbon nanotubes entering a deposition area of a tubular reactor, and comprises a collecting net arranged in the deposition area of the tubular reactor, the sealing flange close to the deposition area of the tubular reactor is connected with the end part of the tubular reactor in a screw joint manner, the collecting net is mounted on the sealing flange, a sealing ring is mounted at the axial end part of the sealing flange, and a first abutting surface is arranged in the tubular reactor; in the stroke that the sealing flange is inserted into the tubular reactor and rotates, the end of the sealing flange is matched with the first abutting face to extrude the sealing ring to generate elastic deformation, and the sealing ring subjected to elastic deformation is attached to the collecting net.

The invention belongs to the field of chemical engineering, and relates to a process device and method for continuously synthesizing glycidyl (3-chloro-1, 2-propylene glycol and sodium hydroxide (hereinafter referred to as NaOH) as raw materials). The device comprises a raw material feeding pump, a heat exchanger, a micro-reactor, a delay tube reactor 1, a neutralization micro-reactor and a delay tube reactor 2 which are sequentially in fluid communication through pipelines, the heat exchangers are divided into two groups, one group is used for heat exchange of 3-chloro-1, 2-propylene glycol solution, and the other group is used for heat exchange of alkaline solution. According to the method, a 3-chloro-1, 2-propylene glycol solution and a sodium hydroxide solution (NaOH) are adopted as raw materials, glycidol is continuously prepared through a microchannel reactor, on the basis, an acid-base neutralization reaction can be carried out in situ according to needs to remove redundant alkali, redundant heat generated by the acid-base neutralization reaction is absorbed through a low-temperature material, and energy consumption is reduced; the product is analyzed by gas chromatography, and the generated glycidol does not have hydrolysates or auto-polymerization products, so that the product selectivity is higher.

A process for synthesis of dimethyl ether is proposed, in which a feed gas mixture (E) containing carbon dioxide and / or carbon monoxide and hydrogen is guided through reaction tubes (1) of a cooled shell and tube reactor (10) that are equipped with a first catalyst and a second catalyst, in which the carbon dioxide present in the feed gas mixture (E) and / or the carbon monoxide present in the feed gas mixture is at least partly reacted over the first catalyst with the hydrogen present in the feed gas mixture to give methanol, and in which, in the same shell and tube reactor (10), the methanol is at least partly converted over the second catalyst to dimethyl ether. It is envisaged that the reaction tubes (1) are equipped with the first and second catalysts in the form of a structured bed, where the structured bed has two to four regions (11, 12, 13) in which the first and second catalysts are provided in different physical mixtures, where the regions (11, 12, 13) are arranged such that the concentration of the first catalyst increases in a flow direction through the reaction tubes (1). Also proposed is a plant (100) for implementation of such a process.

The present invention discloses a continuous production process of liquid lithium hexafluorophosphate, and relates to the technical field of lithium ion battery electrolyte. The whole process of this process is carried out under nitrogen sealing conditions. After liquid anhydrous hydrogen fluoride and liquid chlorine are introduced into a microchannel mixer for mixing, they are introduced into a primary tubular reactor together with phosphorus trichloride liquid for reaction, and the generated gas is introduced into a gas-liquid separator and a condenser to obtain phosphorus pentafluoride gas, which is continuously introduced into a secondary tubular reactor to react with a lithium fluoride solution to generate an unsaturated solution of lithium hexafluorophosphate; the generated lithium hexafluorophosphate solution is adsorbed by a trifluoromethyl hydrogen type macroporous cationic resin, the trifluoromethyl hydrogen type macroporous cationic resin is filtered to remove, the filtrate is crystallized and dried, and the dried lithium hexafluorophosphate crystals are prepared as liquid lithium hexafluorophosphate. This process realizes the continuous production of liquid lithium hexafluorophosphate, improves the safety in the production process, effectively improves the product quality, and meets policy requirements.

The invention relates to a supporting and fixing structure of a long-furnace-tube reactor, belongs to the technical field of waste resource recycling, and solves the problem that a long-furnace-tube reactor in the prior art is prone to permanent deformation in the axial direction and the radial direction. A supporting and fixing structure of a long-furnace-tube reactor comprises a supporting frame arranged outside a furnace tube of the long-furnace-tube reactor in a sleeving mode, one end of the furnace tube is fixedly connected with the supporting frame, and the other end of the furnace tube is a free end capable of axially sliding; the supporting and fixing structure further comprises a sliding supporting unit arranged on the supporting frame on the lower side of the free end of the furnace tube and a sliding hanging unit arranged in the middle of the furnace tube. The sliding supporting unit is of a bearing structure capable of sliding in the axial direction and allows the furnace tube to generate axial displacement when the furnace tube is heated and expanded. And the sliding hanging unit allows the furnace tube to generate axial and radial composite displacement when the furnace tube is heated and expanded. And furnace tube deformation under the high-temperature working condition is avoided.

The utility model provides a multi-section tubular reactor and belongs to the technical field of tubular reactors. The multi-section tubular reactor solves the problem that the material temperature and the like of the existing multi-section tubular reactor are difficult to control. The multi-section tubular reactor comprises a first reaction tube with a feeding hole in the bottom and a second reaction tube with a discharging hole in the top, a plurality of first heat exchange tubes are arranged in the first reaction tube at intervals, and a first heat exchange cavity is formed between the inner side wall of the first reaction tube and the outer side walls of all the first heat exchange tubes; a plurality of second heat exchange pipes are arranged in the second reaction pipe at intervals, a second heat exchange cavity is formed between the inner side wall of the second reaction pipe and the outer side walls of all the second heat exchange pipes, a transition pipe is arranged between the first reaction pipe and the second reaction pipe, and a third heat exchange pipe arranged in a snake shape is arranged in the transition pipe; the third heat exchange pipes are integrally arranged in the radial direction of the transition pipe. The multi-section tubular reactor has the advantages that the temperature of materials can be accurately controlled, and the product quality is improved.

The invention discloses a continuous preparation method of lauroyl chloride, which comprises the following steps: heating and melting lauric acid to obtain lauric acid melt; the method comprises the following steps: preparing an overflow diode reactor, continuously introducing phosgene and lauric acid melt into a first tubular reactor, reacting at 50-100 DEG C to obtain a photochemical reaction solution, continuously overflowing the photochemical reaction solution into a second tubular reactor, continuously reacting the unfinished reaction solution, and driving light by nitrogen to obtain lauroyl chloride. The continuous preparation method disclosed by the invention has the advantages of simple process, low online liquid carrying amount, convenience in operation, low cost and the like, and the obtained product is low in chromaticity, high in purity, few in impurities, suitable for industrial production and wide in application prospect.