22results about How to "Efficient mass transfer" patented technology

The invention discloses a method for preparing polyetherketoneketone by using a microchannel reactor, and belongs to the technical field of polymer synthesis, a certain amount of sulfur dioxide and Lewis base are added in the reaction to improve the catalytic activity of Lewis acid, improve the selectivity, increase the solubility of a polymer and avoid precipitation of a product in a microchannel; the reaction selectivity is improved through the micro-channel reactor, generation of side reaction impurities of tonnage alcohols is avoided, the obtained product is high in purity, and the step of purifying the intermediate 1, 4-bis (4-phenoxybenzoyl) benzene is omitted; the molecular weight distribution of the product is narrower; the materials are all fed in a liquid mode after being dissolved, and introduction of Lewis acid and mechanical impurities in other raw materials and reagents is avoided through filter pressing; and continuous production can be realized, the production efficiency is improved, and the production cost is reduced.

The invention relates to the field of electrochemical energy storage, and discloses a vanadium redox flow battery stack optimization and performance prediction method, which comprises the following steps: constructing a high-precision reaction kinetic model, and accurately describing the kinetic behavior of an electrode reaction based on a multi-step reaction mechanism, a surface adsorption-desorption process and heterogeneous surface reaction distribution; based on the output of the reaction kinetic model, constructing a multi-physical field coupling model, including ion mass transfer, fluid dynamics and heat transfer models, to cooperatively simulate the ion concentration, fluid flow and temperature field distribution in the galvanic pile; and based on the state variables of the multi-physics field coupling model, constructing a dynamic prediction model of chemical reaction-heat-fluid coupling, and predicting the future performance of the galvanic pile in real time through a long and short term memory network model. According to the method, the energy efficiency, the power density and the service life of the vanadium redox flow battery can be improved, and support is provided for intelligent management and optimization of the vanadium redox flow battery.

The invention discloses a method for synthesizing 2, 5-furandicarboxylic acid and co-producing furan from furoate, which comprises the following steps: synthesizing 2, 5-furandicarboxylic acid and furan by using a high-pressure reaction kettle, furoate, carbon dioxide and auxiliaries in a solvent and catalyst system through a one-pot method. A gas-liquid-solid three-phase mixture in the reaction kettle is separated, the gas phase is a mixture of furan and carbon dioxide, the mixture is discharged to a subsequent condensing device through an exhaust valve, and furan is obtained through condensation and separation; the liquid phase and the solid phase are separated through filtration, the liquid phase is a solvent and can be repeatedly used after being dewatered through a molecular sieve, the solid phase is 2, 5-furandicarboxylic acid salt and a catalyst, water is added for dissolution, then filtration is performed, the solid is dried to obtain the catalyst, and 2, 5-furandicarboxylic acid can be obtained by acidification of an aqueous solution. The method is simple and controllable in technological process, high in product purity and simple and convenient in post-treatment, and the obtained product is used for synthesis of various drugs, furyl polymers, THF and medical intermediates and has a good application prospect.

The application discloses a preparation method of medium and long chain fatty acid triglyceride, and belongs to the technical field of oil deep processing. Firstly, plant oil and medium chain fatty acid triglyceride are used as substrates, a low eutectic solvent is used as a reaction medium, and an ester exchange reaction is carried out under the catalysis of immobilized lipase; after the reaction is completed, centrifugal treatment is carried out, and the low eutectic solvent, the immobilized lipase and the reaction product are recovered respectively; the recovered low eutectic solvent and the immobilized lipase are used for the next batch of reaction, and the recovered upper oil phase is the reaction product. The application uses immobilized lipase to catalyze ester exchange to prepare medium and long chain fatty acid triglyceride in a low eutectic system, the substrate conversion rate and the product generation amount are high, the product separation is easy, further separation and purification are not needed, the low eutectic solvent is green, environment-friendly and reusable, and the method has good ecological, economic benefits and industrialization application prospects.

The invention discloses a rectifying tower capable of preventing plate surface pollution, and relates to the technical field of rectifying towers, the rectifying tower comprises a tower body, the front side of the tower body is movably connected with a front opening door, a tower plate is arranged in the tower body, the rectifying tower also comprises a dynamic antifouling mechanism and a synchronous conversion mechanism, and the dynamic antifouling mechanism and the synchronous conversion mechanism are both arranged in the tower body. By arranging the dynamic anti-fouling mechanism and utilizing the transverse reciprocating motion of the tower plate in the tower body, the tower plate can be effectively prevented from being blocked, excessively polluted and loosened, deposits on the surface of the tower plate are dispersed, the phenomenon that normal operation of the tower body is influenced due to excessive accumulation of the deposits is avoided, equipment abrasion and corrosion caused by long-term accumulation are reduced, and the service life of the tower body is prolonged. Meanwhile, the transverse reciprocating movement of the tower plates is also beneficial to improving the hydrodynamic characteristics in the tower body, so that the distribution of gas or liquid in the tower body is more uniform, and the mass transfer efficiency and the heat transfer efficiency are improved.

The present invention discloses a low-temperature denitration catalyst and a preparation method thereof. The catalyst comprises the following raw materials by weight: 60-70 parts of nano titanium dioxide, 0.5-2.5 parts of zirconium oxide, 0.5-3 parts of modified graphene, 0.02-0.1 parts of chloroiridic acid, 5-8 parts of ammonium heptamolybdate, 0.5-2.5 parts of ammonium metavanadate, 2-10 parts of cerium nitrate, 3-8 parts of polypropylene fiber, 1-4 parts of ultrafine activated carbon, 2-6 parts of aluminum sol, 1.5-5 parts of polyethylene oxide, and 1.2-3.5 parts of aminocellulose. The denitration catalyst prepared by the present invention has the characteristics of large specific surface area, high porosity, high low-temperature catalytic activity, strong anti-poisoning ability, high strength, etc., and is particularly suitable for use in the low temperature range of 100-180°C, and has broad application prospects.

The utility model discloses a high-concentration organic wastewater treatment device which comprises a tank body, the top end of the tank body is connected with a water inlet pipe through a rotary water distributor, and the interior of the tank body is divided into an electrolytic catalytic oxidation area, an anaerobic reaction area and a sediment backflow area from top to bottom; the electrolytic catalytic oxidation zone is provided with a plurality of titanium-based electrode plates which are arranged in parallel at intervals, a porous ceramic catalyst is filled between the titanium-based electrode plates, the anaerobic reaction zone is divided into a plurality of reaction chambers by a plurality of baffle plates, the adjacent baffle plates in the vertical direction deviate from each other, the bottoms of the baffle plates are provided with flow guide angles, and the flow guide angles are communicated with the reaction chambers. The reaction chamber is filled with a modified polyurethane biological filler; the precipitation reflux zone comprises an inclined tube precipitation layer and a conical sludge hopper, and the conical sludge hopper is connected with the head end of the anaerobic reaction zone through a gas stripping pipe. The high-concentration organic wastewater treatment device has the advantages of being compact in structure, high in high-concentration organic wastewater treatment efficiency and high in impact resistance.

The invention provides a method for recovering lithium from waste lithium iron phosphate black powder, which comprises the following steps: S1, heating, stirring and mixing ethylene glycol and ferric chloride hexahydrate to obtain a eutectic solvent; s2, adding waste lithium iron phosphate black powder into the eutectic solvent, and reacting to obtain reaction slurry; and S3, carrying out solid-liquid separation on the reaction slurry to obtain a lithium-containing leachate. According to the method, the lithium in the waste lithium iron phosphate black powder can be selectively leached, and the leaching rate of the lithium can be increased.

The invention provides a preparation method of an integrated platinum group metal gas diffusion catalyst layer, which comprises the following steps: (1) mixing a zinc-based organic metal framework, polyacrylonitrile and N, N-dimethylformamide to obtain an electrostatic spinning precursor solution; (2) spinning the electrostatic spinning precursor solution by using an electrostatic spinning machine, and collecting to obtain a Zn-MOF fiber layer; (3) the Zn-MOF fiber layer is placed in inert gas for high-temperature carbonization, the carbonization temperature is 700-1000 DEG C, and a Zn-containing N-doped carbon fiber layer is obtained; and (4) dipping the Zn-containing N-doped carbon fiber layer in a platinum group metal salt solution at 20-60 DEG C for 2-24 hours, taking out and drying to obtain the platinum group metal gas diffusion catalyst layer. According to the invention, a catalytic layer (CL) and a gas diffusion layer (GDL) are combined into a whole, and adjustment of a multi-stage pore channel is realized.

This invention discloses a method for treating ammonia-containing tail gas, relating to the field of ammonia-containing tail gas treatment. The method involves the ammonia-containing tail gas entering from the bottom of an acid washing tower and passing sequentially from bottom to top through a bottom washing liquid zone, a first packing zone, a second packing zone, a spray zone, and a demister for treatment. The spray zone uses atomizing nozzles to spray out a mixed washing liquid, controlling the pH value and conductivity of the washing liquid. Each atomizing nozzle includes a nozzle body, a first chamber, multiple diversion holes, a second chamber, and an outlet hole formed on the nozzle body and connected sequentially. The opening width of the diversion holes is smaller than the opening width of the outlet holes, and the width of the outlet holes increases along the axial direction. The orthographic projections of the diversion holes and the outlet holes on the end face of the nozzle body near the outlet hole do not intersect. This method can achieve efficient removal of ammonia from the tail gas even when the pH value of the washing liquid is high, resulting in a low acid mist value in the tail gas. It eliminates the need for a secondary water washing tower for treatment, thus reducing costs.

The invention discloses a three-sleeve millichannel reactor which comprises a reaction unit, a reaction liquid supply unit and a constant-temperature liquid supply unit, the reaction unit comprises a first pipe body, a second pipe body and a third pipe body which are sequentially sleeved from inside to outside; the outer wall of the first pipe body and the inner wall of the second pipe body form a first annular space; the outer wall of the second pipe body and the inner wall of the third pipe body form a second annular space; the reaction liquid supply unit and a liquid inlet of the first annular space can be connected and disconnected, and the constant-temperature liquid supply unit and a liquid inlet of the second annular space can be connected and disconnected; a first turbulent flow assembly is arranged in the first annular space, and a second turbulent flow assembly is arranged at a liquid inlet of the first annular space; the second turbulent flow assembly comprises a first channel and a second channel; the first channel is communicated with the first pipe body, and the second channel is communicated with the first annular space. According to the reactor, through the design of the multi-layer sleeve structure, the turbulent flow assembly and the liquid inlet, the mixing uniformity degree of reactants in the first annular space is promoted, and a powerful guarantee is provided for efficient chemical reaction.

This invention relates to an apparatus and method for the efficient capture of iodine-containing exhaust gas, comprising a tower system, a gas supply system, an absorbent system, an exhaust gas detection system, and a control system. Iodine-containing exhaust gas enters from the bottom of the tower system via the gas supply system and flows upward within the tower. The absorbent system enters from the top of the tower system via a nozzle and flows downward. The two gases come into countercurrent contact within the tower. Sodium hydroxide in the absorbent reacts with iodine in the exhaust gas to form iodide, thus converting iodine from the gas phase to the liquid phase, achieving iodine absorption and capture. After absorption and capture, the exhaust gas passes through a demisting section to capture entrained droplets before being discharged from the top of the tower system. The exhaust gas detection system measures the concentration of iodine in the exhaust gas. This method enables efficient gas-liquid contact and mass transfer, and achieves constant-temperature circulation and composition control of the alkaline solution. Through optimized tower structure and control system, it achieves stable and efficient capture of iodine from iodine-containing exhaust gas, possessing good potential for scientific research verification and engineering scale-up.

The invention provides a micro-channel reactor, a micro-channel reaction circulation system and a reaction method, and relates to the technical field of micro-channel reaction.The micro-channel reactor comprises a gas plate, a liquid plate and a diffusion layer, and the gas plate and the liquid plate are oppositely arranged and connected; the diffusion layer is installed between the gas plate and the liquid plate, the gas plate is provided with a gas flow channel facing the diffusion layer, and the liquid plate is provided with a liquid flow channel facing the diffusion layer. By adopting the micro-channel reactor, reactants can be uniformly mixed within a short time, the specific surface area is increased, the heat transfer and mass transfer processes can be efficiently carried out, the reaction is more sufficient, and the reaction rate is increased.

The invention discloses a microreactor for enhancing hydrogen production through symbiosis of phycomycetes and a preparation method of the microreactor, and the preparation method comprises the following steps: uniformly mixing hydrogen-producing microalgae and a sodium alginate solution to obtain a microalgae-sodium alginate solution, then filling the microalgae-sodium alginate solution into an injector of a two-channel microflow pump, and filling a calcium chloride solution into the other injector of the two-channel microflow pump; connecting the two-channel micro-flow pump with a printing head of a 3D printer, respectively pumping out the microalgae-sodium alginate solution and the calcium chloride solution from the printing head according to a preset hydrogen production microalgae kernel model, and printing to obtain a hydrogen production microalgae kernel of the hydrogen production microreactor; the preparation method comprises the following steps: uniformly mixing electroactive bacteria with a chitosan solution to obtain a bacteria-chitosan solution, soaking a hydrogen-producing microalgae core in the bacteria-chitosan solution, and stirring for 25-30 minutes to obtain the hydrogen-producing microreactor. The preparation method disclosed by the invention is simple and high in repeatability, and the prepared hydrogen production microreactor can maintain a long-term anaerobic microenvironment and high hydrogenase activity, so that the hydrogen yield of microalgae can be effectively improved.

The application provides a kind of asbestos tailings-based material for hexavalent chromium reduction and a preparation method thereof.The material uses asbestos tailings as raw material, is solidified in alkaline silicate system and is foamed to form a porous magnesium silicate skeleton;By vacuum and pressure impregnation, MXene-oxalic acid intercalation complex is loaded and confined in the internal pores of the porous skeleton, and the efficient reduction of hexavalent chromium to trivalent chromium is realized by using the redox activity of MXene, and the reduction product is stabilized and complexed by the intercalated oxalic acid;Further, an antioxidant functional layer is constructed in situ on the surface of the material to inhibit the deactivation and reoxidation of the active components in the oxygen-containing water environment, thereby improving the removal efficiency of the material for hexavalent chromium, the product fixing capacity and the long-term use stability.

The invention provides a synthesis method of iso-tridecanol. The synthesis method comprises the following steps: S1, carrying out carbonylation reaction on C5-6 Fischer-Tropsch olefin and synthesis gas under the action of a carbonylation catalyst to obtain C6-7 aldehyde; s2, performing condensation reaction on C6-7 aldehyde under the action of a condensation catalyst to obtain iso-tridecenal; s3, carrying out hydrogenation reaction on the iso-tridecenal under the action of a hydrogenation catalyst to obtain iso-tridecanol; wherein the condensation reaction is carried out in the microchannel reactor. The microchannel reactor is used, so that uniform mixing and contact of materials are facilitated, the mass transfer process between the condensation catalyst and C6-7 aldehyde is more efficient, generation of by-products caused by local overheating is avoided, the yield of isotridecenal is increased, and the yield of the final product isotridecanol is increased.

The invention belongs to the technical field of organosilicon chemistry, and particularly discloses a method for preparing p-chloromethyl phenethyl triethoxy silane through continuous alcoholysis of a silane mixture. The method specifically comprises the following steps: preheating a mixed raw material consisting of p-chloromethyl phenethyl trichlorosilane and chloropropyl trichlorosilane, and continuously and reversely flowing the preheated mixed raw material and overheated ethanol steam into an effective-height packed tower reactor, so that a mixed silane liquid film and the ethanol steam are in full contact on the surface of packing to generate alcoholysis reaction; hydrogen chloride generated by the reaction is immediately entrained and moved out by ethanol steam, and a product is continuously extracted from the tower bottom and is rectified and purified. The non-catalytic continuous alcoholysis process has multiple remarkable advantages, the greenization and simplification of the production process are realized by thoroughly abandoning the catalyst and the acid-binding agent, and the generation amount of three wastes is extremely small.

The present invention belongs to the technical field of carbon dioxide capture, and specifically discloses a tubular parallel-current carbon dioxide absorption and desorption continuous operation system and method. It is used to solve the problems of large equipment volume, high operating cost and high energy consumption of the traditional countercurrent packed tower chemical absorption method. The operating system includes a low partial pressure carbon dioxide inlet, a carbon dioxide ejector, an absorption reactor, a first gas-liquid separator, a first heat exchanger, a second heat exchanger, a rich liquid pump, a desorption reactor, a heater, a pressure controller, a second gas-liquid separator, a third gas-liquid separator, an absorbent storage tank and a lean liquid pump. The present invention adopts continuous operation throughout the whole process, realizes the efficient recycling of carbon dioxide absorbent, effectively reduces the number of carbon capture equipment and the floor space, reduces labor costs and operation risks, improves carbon capture efficiency, and reduces the cost of transformation and maintenance of existing equipment, so as to realize parallel-current continuous operation of efficient, low-energy consumption green carbon dioxide absorption and desorption.

The invention relates to the technical field of organic chemical engineering, provides a continuous flow preparation method of a biotin valeric acid side chain, and solves the problems of long reaction time, large potential safety hazard, high energy consumption and low efficiency of a traditional intermittent kettle type synthesis mode. The method comprises the following steps: simultaneously conveying an organic solution of sodium alkoxide and a solution containing malonate, a chloride and a catalyst into a mixer, then feeding into a reactor 1, carrying out continuous alkylation reaction, feeding an effluent reaction solution 1 into a continuous filtering device for desalting, and recovering a solvent from a filtrate through a continuous solvent recovery device; continuously conveying a high-boiling product into a reactor 2 for decarboxylation reaction; mixing the effluent reaction liquid 2 with a sodium hydroxide aqueous solution through a mixer, and then conveying the mixture into a reactor 3 for continuous hydrolysis reaction; mixing the outflowing reaction liquid 3 with a hydrochloric acid aqueous solution through a mixer, conveying the mixture into a reactor 4 for continuous acidification, and finally performing continuous extraction separation to obtain a target product.

The invention discloses a core-shell structure catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The core-shell structure catalyst is successfully synthesized by regulating and controlling the core-shell chemical composition and crystallization conditions. In the preparation method, the utilization of the seed crystal inhibits the influence of the core skeleton characteristics on the shell layer, and the subsequent secondary growth induces to form a shell structure which grows mutually. The catalyst prepared by the invention takes the ZSM-5 zeolite with an acidic core site as a main component and the MCM-22 zeolite with a supercage structure as a structural basis, the ZSM-5 zeolite and the MCM-22 zeolite have a synergistic effect and respectively show excellent performance in dehydrogenation, oligomerization, cyclization reaction and carbon deposition resistance of methane, and compared with a traditional catalyst, the catalyst has the advantages that the catalyst has higher catalytic activity by constructing a heterogeneous molecular sieve core-shell structure and loading the metal Mo, and the catalyst has better application prospect. According to the catalyst, the benzene yield is obviously improved, the service life is prolonged, and the carbon deposition resistance is relatively high. The prepared core-shell structure catalyst not only serves MDA, but also can be expanded to other high-temperature acid catalytic reactions, and industrialization and process integration are promoted.

This invention provides a ship exhaust gas treatment device, which includes a reaction tower and, from bottom to top, a cooling spray layer, a turbulence layer, a spray layer, and a demisting layer arranged within the reaction tower. The reaction tower has a flue gas inlet at its bottom and a flue gas outlet at its top. At least one turbulence device is arranged within the turbulence layer, which thoroughly mixes the desulfurization solution sprayed from the spray layer with the cooled flue gas. This exhaust gas treatment device integrates all reaction layers into a single reaction tower, reducing the operating resistance of the desulfurization tower, decreasing its volume, lowering investment costs, and improving desulfurization efficiency through the arrangement of turbulence and spray.

The application discloses a method for preparing L-ascorbyl fatty acid ester by using an enzyme and a product thereof, and comprises the following steps: (1) a one-step method is used to prepare a microarray carrier with a hydrophobic and mesoporous structure, free enzymes are dissolved in a PBS buffer solution, and the enzymes are fixed on the microarray carrier by using a multiple adsorption method and are freeze-dried, so that a lipase microarray is obtained, the immobilization amount of the lipase microarray is between 100-300 mg / g, and the activity is 80-180 U / g; (2) L-ascorbic acid and fatty acid are added into a reaction solvent, the L-ascorbic acid is dissolved by stirring for a certain period of time, then the lipase microarray obtained in the step (1) is added, and the esterification reaction is carried out by stirring for a period of time, nitrogen is combined and vacuum is extracted to remove water, so that a crude L-ascorbyl fatty acid ester product is obtained; and (3) the crude L-ascorbyl fatty acid ester product obtained in the step (2) is separated and purified, and high-purity L-ascorbyl fatty acid ester is obtained. The application has the advantages of high catalytic efficiency, strong fat-solubility and antioxidant property of the product, simple operation, green environmental protection, simple product separation, and suitability for scale-up production.