80 results about "Reactive separation" patented technology

The invention discloses a method for separating, purifying and regenerating waste battery negative electrode powder, which belongs to the field of battery recycling and regenerating, and mainly comprises the following process steps of: ball-milling and screening waste battery negative electrode pieces into certain granularity, soaking the waste battery negative electrode pieces in alkali liquor and an impurity removal agent, and stirring for reaction and separation to obtain a negative electrode powder wet material and a copper ion solution; carrying out drying demagnetization and infrared irradiation treatment on the wet negative electrode powder to obtain regenerated negative electrode powder; and the copper ion solution is subjected to extraction, back extraction and reduction to obtain crude copper, and the crude copper is subjected to vacuum distillation to obtain an electronic-grade copper product. Wherein the impurity removal agent comprises an oxidizing agent, the oxidizing agent oxidizes elemental copper and forms soluble substances under the action of alkali liquor, and the excellent separation effect is achieved. The negative electrode powder treatment comprises infrared irradiation treatment, decomposition of an adhesive can be achieved through the dual effects of heat irradiation and heat conduction, the volume heating effect is formed through scattering, surface crusting is effectively avoided, the adhesive can be efficiently removed, and the quality and the recycling efficiency of the regenerated negative electrode powder are guaranteed.

The invention belongs to the technical field of gas membrane separation technologies and catalytic materials, and particularly relates to a ZSM-12 molecular sieve-based separation membrane, a preparation method and application thereof, and a reaction separation device using the separation membrane. The preparation method comprises the following steps: mixing and stirring a PEI polymer solution and a ZSM-12 molecular sieve to obtain a ZSM-12PEI membrane casting solution, scraping the ZSM-12PEI membrane casting solution on a glass plate pasted with a base membrane at a constant speed by using a 200 [mu] m scraper, and then drying in a constant-temperature and constant-humidity chamber at the temperature of 30 DEG C and the humidity of 40RH for 24 hours. The reaction separation device disclosed by the invention is designed in a manner that four stages of chambers are connected in series, so that the CO purity can be purified to 99% through step-by-step enrichment. CO is timely separated to avoid secondary oxidation, and the utilization rate of the catalyst is greatly improved.

The wastewater treatment system comprises a water inlet unit, a reactor, a separation unit and a circulation unit which are sequentially connected to form a closed-loop system, the water inlet unit is further connected with a chemical dosing unit, the water inlet unit is used for conveying wastewater to the reactor, and the chemical dosing unit is used for adding alkali into the wastewater to adjust the pH value and providing required magnesium ions; a fluidization reaction zone and a separation zone are arranged in the reactor, and the fluidization reaction zone promotes generation and growth of struvite particles through particle collision and aggregation; the separation zone enables generated particles to partially fall back to the fluidization reaction zone for continuous reaction through preliminary solid-liquid separation; the separation unit is used for receiving the wastewater in the separation area, further removing residual particles, and enabling the small particles to flow back to the reactor through the circulation unit for recycling. By optimizing the particle generation, separation and backflow processes in wastewater treatment, the formation of target large particles is promoted, the resource recycling is facilitated, meanwhile, the consumption of chemical agents is reduced, and the cost is reduced.

The application discloses a device and method for preparing tert-butylamine by directly ammoniating isobutene, which comprises sequentially connected raw material preparation unit, reaction separation unit, rectification separation unit and circulating recovery unit; the raw material preparation unit is used for storing, mixing and heating raw materials; the reaction separation unit is used for pressurizing reaction of the raw materials in the raw material preparation unit and gas-liquid separation of products; the rectification separation unit is used for rectification separation of liquid-phase products separated by the reaction separation unit and recovery of part of unreacted raw materials; and the circulating recovery unit is used for rectification recovery of part of raw materials of gas-phase products separated by the reaction separation unit. The application has the characteristics of low overall equipment investment, high energy utilization rate, simple product separation and purification, perfect overall device design and small environmental pollution.

The invention provides a method and a system for synthesizing 5-methyl-3, 5-dicyclopropyl pyrazoline through reaction-separation coupling of a micro-fluidic chip and a super-hydrophilic / underwater super-oleophobic film, belongs to the technical field of spaceflight liquid propellants, and aims to solve the technical problem that the 5-methyl-3, 5-dicyclopropyl pyrazoline cannot be continuously prepared. The preparation method disclosed by the invention comprises the following steps: respectively preheating 1, 3-dicyclopropyl-2-butene-1-one and hydrazine hydrate, introducing the preheated 1, 3-dicyclopropyl-2-butene-1-one and hydrazine hydrate into a micro-fluidic chip for reaction, and separating and dehydrating a cooled material which flows out after the reaction through a super-hydrophilic / underwater super-oleophobic membrane to obtain the 5-methyl-3, 5-dicyclopropyl pyrazoline. According to the present invention, the micro-chemical chip continuous flow synthesis technology and the super-hydrophilic / underwater super-oleophobic membrane separation technology are coupled in real time, such that the reaction-separation process integration continuity is achieved, the heterogeneous liquid-liquid mass transfer and mixing of the system are enhanced, and the efficient preparation of the 5-methyl-3, 5-dicyclopropyl pyrazoline and the real-time rapid oil-water separation are achieved.

The present application belongs to the field of refinery dry gas utilization, and discloses a system and method for preparing propylene by disproportionation of refinery dry gas. The system comprises a raw material pretreatment unit, a disproportionation reaction unit and a product separation unit. The raw material pretreatment unit comprises, in sequence, an alkali washing package, a dry gas compressor, a dry gas absorption tower, a first desorption tower, a second desorption tower and a circulating carbon four cooler. The disproportionation reaction unit comprises a disproportionation reactor inlet-outlet heat exchanger, a disproportionation reactor and a reaction outlet cooler. The product separation unit comprises a deethanizer, a propylene rectification tower, a reaction separation tail gas absorption tower and a remaining carbon four cooler. The system and method can reduce the consumption of carbon four raw material, improve the recovery rate of ethylene in refinery dry gas and reduce consumption.

The invention discloses integrated equipment for synthesizing ammonia through electro-catalysis nitrate radical reduction, and relates to the technical field of crossing of water treatment and resource recovery. A main cavity is supported by the tops of the supporting legs. A bipolar membrane sealing and separating assembly, an anode chamber assembly and a cathode chamber rotational flow reaction and separation assembly are respectively arranged in the main cavity, and an inner cavity of the main cavity is divided into an upper anode chamber and a lower cathode chamber by the bipolar membrane sealing and separating assembly; through systematic in-situ cooperation of the anode chamber assembly, the bipolar membrane sealing and separating assembly and the cathode chamber rotational flow reaction and separation assembly, organic unification of efficient conversion of nitrate radicals, high-selectivity recovery of ammonia products, self-stabilization of a reaction microenvironment and minimization of process energy consumption is realized by means of precise design and cooperation of all the parts; the core pain points of reaction separation and separation, serious mass transfer limitation, easy catalyst inactivation and amplified operation instability of a traditional device are specifically solved, and the industrial requirements of low-concentration wastewater treatment and distributed green ammonia synthesis are met.

The invention relates to a system and a method for preparing 2-methyl-1, 3-propylene glycol diacetate. The system comprises: a preheater, which is used for preheating 2-methylene-1, 3-propylene glycol diacetate and hydrogen; the hydrogenation reactor is connected with the preheater and is used for providing a reaction place for hydrogenation reaction of 2-methylene-1, 3-propylene glycol diacetate and hydrogen; the hydrogenation reactor is filled with a hydrogenation catalyst loaded with a Pd-based bimetallic catalyst; the gas-liquid separator is connected with the hydrogenation reactor and is used for separating the 2-methyl-1, 3-propylene glycol diacetate generated in the hydrogenation reactor from the residual hydrogen; and the refining tower is connected with the bottom of the gas-liquid separator and is used for purifying the 2-methyl-1, 3-propylene glycol diacetate. Compared with the prior art, the method is good in atom economy, low in raw material cost, high in catalyst activity, good in stability, high in production continuity degree, simple in reaction separation process, high in product purity and suitable for large-scale production.

The application provides a method for synthesizing 2,4,4-trimethyl-2-pentanol from diisobutene by esterification hydration, comprising the following steps: S1, esterification hydration reaction: diisobutene, organic acid and water are reacted in the presence of a catalyst; S2, separation and recovery: S3, hydrogenation reaction: 2,4,4-trimethyl-2-pentyl acetate recovered in step S2.5 is subjected to catalytic hydrogenation to generate a hydrogenation reaction liquid containing 2,4,4-trimethyl-2-pentanol and ethanol; S4, the hydrogenation reaction liquid obtained in step S3 is separated, and TMPOL is synthesized by using the above method with the organic acid as a medium, the single-pass conversion rate of diisobutene can reach 50%, and the selectivity reaches 99%. The process has the characteristics of high efficiency and high atom economy, and has great industrialization potential.

The invention discloses a system for removing alcamines in NMP (N-Methyl Pyrrolidone) recovery liquid. The system comprises a dehydration rectifying tower, a reaction separation tower, a product refining tower and a reaction and reaction separation tower reboiler which is used as a reactor, the dehydration rectifying tower is respectively connected with the reaction separation tower and the product refining tower; the reaction and reaction separation tower reboiler is connected with the reaction separation tower; the reaction and reaction separation tower reboiler is connected with a dehydration rectifying tower or a product refining tower; the reaction and reaction separation tower reboiler comprises an outer heat exchange tube; an inner reaction heat exchange tube is arranged in the outer heat exchange tube; the inner reaction heat exchange tube is an inner enhanced heat exchange tube; the reaction and reaction separation tower reboiler is provided with an inner side tube plate for separating a shell pass of the reaction and reaction separation tower reboiler from an outer heat exchange tube pass and an outer side tube plate for separating the outer heat exchange tube pass from an inner reaction surrounding tube pass. The method realizes high yield, fast reaction rate and energy-saving removal of alcamines in NMP.

The utility model relates to the technical field of disulphide production, and discloses a disulphide purification device with a wastewater recovery structure, which comprises a primary reaction separation mechanism and a filtering separation mechanism, the primary reaction separation mechanism comprises a reaction kettle, and a stirring paddle is arranged at the central position in the reaction kettle; the upper end and the lower end of the annular outer side wall of the reaction kettle are each fixedly sleeved with an annular heater. According to the utility model, the wastewater recycling mechanism for deep treatment is additionally arranged, the wastewater collecting box connected with the wastewater discharge interface of the distillation tower is arranged, wastewater containing an extracting agent and a small amount of disulphide generated in the distillation process is collected, and the extracting agent recycling device is arranged and can be an activated carbon adsorber or a reverse osmosis membrane filter; the extraction agent in the wastewater is recycled, trace impurities in the wastewater are further removed, and the purity of the recycled water is improved, so that the recycled water meets the discharge standard or the water quality requirement for recycling.

The present invention provides a synthetic fuel manufacturing apparatus that can perform multiple processes in a single unit when manufacturing synthetic fuel by mixing oil and water. [Solution] To continuously perform the process of mixing and reacting water and oil, which have different specific gravities, and then separating the two liquids, the system is equipped with reaction / separation tanks T3 and T4, which consist of an inner reaction tank T3 and an outer separation tank T4. The inner reaction tank T3 reacts the mixed liquid, which is supplied by a stirring pump P2, while stirring it. The mixed liquid is taken from the bottom of the reaction tank T3 and discharged into the outer separation tank T4 via a separation pipe 3 that is sent to the top of the separation tank T4. The discharged mixed liquid is separated into two types based on the difference in specific gravity and discharged from the oil outlet at the top of the separation tank and the water outlet at the bottom of the separation tank. At this time, the outlet height of the separation pipe 3 to the separation tank can be adjusted according to the reaction time in the reaction tank T3.

This invention provides a reaction and separation tank that can perform multiple processes in a single unit when mixing oil and water to produce synthetic fuel. [Solution] To continuously perform the process of mixing and reacting water and oil, which have different specific gravities, and then separating the two liquids, the system is equipped with reaction / separation tanks T3 and T4, which consist of an inner reaction tank T3 and an outer separation tank T4. The inner reaction tank T3 reacts the mixed liquid, which is introduced by a stirring pump, while stirring it. The mixed liquid is taken from the bottom of the reaction tank T3 and discharged into the outer separation tank T4 via a separation pipe 3 that is sent to the top of the separation tank T4. The discharged mixed liquid is separated into two types based on the difference in specific gravity and discharged from the oil outlet 4a at the top of the separation tank T4 and the water outlet 4c at the bottom of the separation tank T4. The separation pipe 3 has a double-pipe structure in which two pipes can move relative to each other, and the outlet height to the separation tank T4 can be adjusted according to the reaction time in the reaction tank T3.

The utility model relates to the technical field of chemical reaction separation equipment, and provides a membrane reaction separation kettle which comprises a kettle body, and a plurality of membrane stack components, a stirrer, a gas distributor and a liquid distributor are arranged in the kettle body; the kettle body is provided with a discharge port, a backflushing port, a clear liquid outlet, a catalyst inlet and a liquid inlet; and the membrane stack assembly is uniformly distributed along the inner wall of the kettle body and consists of a plurality of membrane tubes, and two ends of each membrane tube are connected with the clear liquid branch tube and the clear liquid collecting tube. The cleaning brushes are arranged on the outer walls of the membrane pipes in a sleeving manner, and all the cleaning brushes are connected together through cleaning brush supporting rods, extend out of the kettle body through connecting rods and are connected with a driving motor to drive the cleaning brushes to reciprocate up and down along the membrane pipes so as to quickly remove filter cake layers on the surfaces of the membrane pipes. And the back-flushing system is provided with a back-flushing tank, a back-flushing pipeline and a back-flushing pump. According to the technical scheme, the problems that in the prior art, the membrane flux stability and flux recovery are obviously insufficient, and efficient chemical production is restricted are solved.

The invention relates to the technical field of solar thermochemical utilization and hydrogen preparation, and discloses a hydrogen separation and CO2 adsorption synergistic reinforced solar methanol reforming hydrogen production system, which integrates a reaction unit and a separation unit, and solves the problem of reaction separation disjunction of a traditional system. In the prior art, most of a reaction unit, a carbon dioxide removal unit and a hydrogen separation unit are independent equipment and need to be connected through pipelines, and the problems of heat loss, reaction inhibition and the like exist. The membrane-adsorption coupling reaction separation unit adopts an integrated reforming reaction kettle structure of a glass tube, a vacuum region, a heat absorption tube, a reaction region and a hydrogen permeable membrane, and four functions of solar heat absorption, methanol steam reforming reaction, carbon dioxide adsorption removal and hydrogen selective separation are integrated and designed in the same equipment; real-time cooperation of reaction and separation is guaranteed from the space structure, the space utilization rate is improved, meanwhile, heat loss and the reaction inhibition effect are greatly reduced, and the overall efficiency of the system is remarkably improved.

The invention discloses an energy circulation and regulation management system of a hydrogen power device, which comprises an ammonia gas supply unit, a hydrogen power unit and a hydrogen power unit, the reaction separation unit comprises a combustion chamber; the integrated reaction separator is provided with a gas inlet, a hydrogen outlet and a tail gas port; an outlet of the ammonia gas supply unit is respectively communicated with the combustion chamber and a gas inlet of the integrated reaction separator; the combustion chamber exchanges heat with the integrated reaction separator and is used for providing reaction heat for the integrated reaction separator; a catalytic reaction area for catalytic cracking of ammonia gas, a dielectric barrier discharge area for ionization of gas and a hydrogen permeation membrane area for separation and purification of hydrogen are integrated in the integrated reaction separator; the power generation unit comprises a hydrogen fuel cell reactor, and the hydrogen input end of the hydrogen fuel cell reactor is communicated with the hydrogen outlet of the integrated reaction separator; the electric energy input end of the energy management unit is connected with the electric energy output end of the hydrogen fuel cell reactor, and the energy management unit is used for distributing electric energy to the energy storage device and the power output device.

The invention discloses 1, 1-bis (4-hydroxybenzene)-tetrahydronaphthalene as well as a preparation method and application thereof, and belongs to the technical field of organic synthesis. The invention provides a preparation method of 1, 1-bis (4-hydroxybenzene)-tetrahydronaphthalene, and the preparation method comprises the following steps: carrying out a melting reaction on 1-tetralone and phenol in the presence of an inert gas atmosphere and a catalyst, and carrying out separation and purification to obtain the 1, 1-bis (4-hydroxybenzene)-tetrahydronaphthalene. According to the preparation process provided by the invention, the homogeneous phase characteristic of a melting reaction system is utilized, reactants are in full contact and are subjected to directional condensation, the product can be purified only through simple separation and purification, the synthesis and purification difficulty of the product is greatly reduced, the synthesis yield can reach 85% or above, and the purity reaches 88% or above. The large-scale preparation of the 1, 1-bis (4-hydroxybenzene)-tetrahydronaphthalene is successfully realized for the first time, the molecular design space of a polyaryletherketone high-performance material is widened, and the method has a wide application prospect in integrated circuit boards.

The invention discloses a method for preparing liquid alkane by catalytically degrading waste mixed plastics, which comprises the following steps: reacting the waste mixed plastics consisting of polyolefin plastics and oxygen-containing plastics with hydrogen under the action of a catalyst at 150-350 DEG C under a solvent-free condition; separating a reaction product to obtain liquid alkane; the catalyst comprises a carrier and an active component loaded on the carrier, wherein the active component is at least one of Ru, Re, Pt, Pd, Ni, Co, Mo and Cr; the carrier is at least one of activated carbon, a metal oxide and a molecular sieve.

The invention relates to a method for synthesizing adipate through hydroesterification of butadiene. The method comprises the following steps: a) dissolving a palladium catalyst, a phosphine ligand, acid and butadiene in alcohol and an optional solvent in a reaction kettle; wherein the phosphine ligand is a phosphine ligand as shown in a formula I; b) introducing carbon monoxide into the kettle for reaction; and c) finishing the reaction, and separating to obtain the product. The method has the characteristics of high catalytic efficiency, high product yield, high selectivity, simplicity and convenience in operation and the like.

The invention discloses a solid waste harmlessness and recycling method and system based on multi-energy field cooperation and multi-source solid waste tempering, and the method comprises the steps: mixing a target main solid waste raw material with a liquid medium, adding a first-class alkaline solid waste conditioner, and carrying out high-pressure jet flow homogenization circulation treatment to obtain homogeneous slurry; transferring the homogenized slurry into a ball mill, adding a second type of solid waste-based conditioner for ball milling treatment, and realizing deep dissociation and stabilization of pollutants by utilizing a mechanochemical effect; transferring the ball-milled slurry into an ultrasonic-microbubble reaction separation tower, adding the red mud slurry, and separating heavy metal enriched scum through the synergistic effect of ultrasonic cavitation and micro-nano bubbles; treating the separated three-phase system to obtain a top-layer heavy metal enrichment, a bottom-layer purified main solid waste matrix and an intermediate liquid phase, and carrying out chemical precipitation on the intermediate liquid phase to recover phosphorus and nitrogen elements. According to the invention, deep conversion and precise separation of industrial solid waste pollutants and high-value recovery of valuable components are realized.

The utility model discloses a kind of reaction devices for precious metal hydrometallurgy, it is related to precious metal reaction device technical field, including jar body and ultrasonic generator;Jar body: outer side top end is provided with feed shell, the top surface of the jar body is cooperatively installed with the bottom surface of jar cover, the bottom surface of the jar body is fixed with underframe, the both sides of the bottom surface of underframe are equipped with first motor, the output shaft of the first motor is connected with the bottom end of mixing frame, the bottom surface inside the jar body of the mixing frame, this reaction device for precious metal hydrometallurgy, by utilizing ultrasonic cavitation effect intensifies mass transfer process, combined with accurate temperature control and corrosion-resistant design, not only accelerate precious metal dissolution reaction, but also realize reaction-separation integrated operation, effectively reduce precious metal loss and chemical reagent consumption, make reaction device have efficient, energy saving, environmental protection and other comprehensive advantages, suitable for gold, silver, platinum and other precious metal high-purity refining.

This invention belongs to the field of water pollution control and resource utilization technology, specifically relating to a method and application of singlet oxygen-mediated treatment of aromatic amine organic pollutants. The method includes the following steps: constructing a three-electrode electrochemical system using a titanium foam electrode as the working electrode; continuously introducing oxygen source gas into the electrolyte, applying voltage to the three-electrode electrochemical system to conduct an electrochemical reaction, and synthesizing singlet oxygen in situ; adding aromatic amine organic pollutants to the electrolyte, causing the aromatic amine organic pollutants to undergo an oxidative polymerization reaction under the action of singlet oxygen; and separating the solid polymerization product. Compared with existing technologies, this invention solves the problem that existing technologies struggle to achieve both efficient activation and controllable conversion when using singlet oxygen for P-AOPs. This solution achieves efficient pollutant removal through a strategy of synergistic metal activation of oxygen by highly reactive hydrogen species, while also avoiding catalyst deactivation.

The invention belongs to the technical field of waste battery recovery treatment, and particularly relates to a method for selectively recovering lithium in a waste lithium iron phosphate battery, which comprises the following steps: a raw material pretreatment step: carrying out safe discharge, disassembly separation and crushing screening treatment on the waste lithium iron phosphate battery to obtain a pretreated raw material; an oxygen acid leaching step: mixing the pretreated raw material with a sulfuric acid solution to form a suspension, adding a dispersant and a transition metal salt catalyst into the suspension, and introducing oxygen to carry out a leaching reaction; a separation and collection step: after the reaction is finished, cooling to room temperature, and carrying out solid-liquid separation to obtain a lithium-containing leachate and an iron phosphate solid-phase product; the dispersing agent effectively prevents particle aggregation, increases a reaction interface and improves mass transfer conditions; the transition metal salt catalyst efficiently activates oxygen molecules to generate free radical species with high reaction activity, so that the activation energy of oxidation reaction is greatly reduced; under the combined action of the two, the reaction kinetics is remarkably improved.

The utility model discloses a methanol cracking device, including the cracking kettle, the support leg is connected to the cracking kettle lower extreme, the first liquid inlet pipe is connected with the first liquid inlet pipe in the cracking kettle left end upside intercommunication, the second liquid inlet pipe is connected with the second liquid inlet pipe in the cracking kettle right end upside intercommunication, the dispersion mixing subassembly is connected between the first liquid inlet pipe and the second liquid inlet pipe, a plurality of spin mixes reaction separation subassembly are connected with the dispersion mixing subassembly lower extreme intercommunication, the outlet pipe is connected with the cracking kettle upper end intercommunication, the recovery pipe is connected with the cracking kettle front end downside intercommunication, the dispersion mixing subassembly includes first dispersion pipe, second dispersion pipe, intercommunication pipe and primary mixing pipe, the utility model discloses through first distribution pipe, second distribution pipe, first dispersion pipe and second dispersion pipe of mutual alternate setting and the unique design of "V" intercommunication pipe, has realized methanol and the multistage dispersion and premixing of catalyst, thereby has increased the contact area and initial mixing evenness of two kinds of liquid, has laid solid foundation for subsequent high -efficient cracking.

The invention discloses a bifunctional catalyst for ammonia synthesis and decomposition and a reaction separation system, the bifunctional catalyst is a ruthenium-based catalyst, the active component of the bifunctional catalyst is Ru nano-particles, the Ru nano-particles are loaded on a perovskite type carrier La1-xSrxAlO3 (x is greater than or equal to 0.2 and less than or equal to 0.3), the loading amount of Ru is 2-4wt%, and the particle size is 3-6nm. The system integrates a bifunctional reactor, an ammonia permeable membrane assembly, a recycle gas compressor, a nitrogen-hydrogen compressor, a condenser, an ammonia storage tank, a hydrogen-nitrogen separation membrane assembly and a valve group, and flexible conversion between ammonia synthesis and decomposition modes is realized through valve switching. In an ammonia synthesis mode, efficient circulation of unreacted hydrogen and nitrogen can be achieved, and the total conversion rate is larger than or equal to 90%; in an ammonia decomposition mode, ammonia can be efficiently decomposed, high-purity hydrogen can be obtained through separation, and the decomposition rate reaches 90%. The system has the advantages of high catalyst universality, high integration level, low equipment investment, low energy consumption and the like, and is suitable for the field of green ammonia energy storage and hydrogen energy conversion.

The application provides a plugging agent for polar ultra-low temperature drilling fluid and a preparation method and application thereof. The preparation method of the plugging agent comprises the following steps: dispersing nano silicon dioxide into an ethanol aqueous solution, adjusting the pH of the system to 3-5, adding a silane coupling agent, performing reaction, separation and drying to obtain modified nano silicon dioxide; dispersing the modified nano silicon dioxide into isododecane or white oil, adding an oil-soluble monomer, and fully mixing to obtain a mixed solution; mixing the mixed solution and an emulsifier aqueous solution, performing shearing emulsification to obtain an emulsion; adding an initiator, performing reaction, and then performing demulsification, separation and drying to obtain the plugging agent for polar ultra-low temperature drilling fluid. The plugging agent has a core-shell structure, has strong low-temperature resistance, has good dispersibility in the polar ultra-low temperature drilling fluid, and has good plugging effect in the drilling process in the polar ultra-low temperature environment.

This invention relates to the field of heterogeneous catalysts, specifically to a method for preparing and applying an iron-cobalt-based silica hydrogenation catalyst. The invention provides a method for preparing an iron-cobalt-based silica catalyst, comprising the following steps: preparing a kcc-1 precursor by heating a mixture of CTAB with urea, tetraethyl orthosilicate with n-butanol, and cyclohexane. Cobalt nitrate and ferric chloride are dissolved in water, thoroughly mixed with a support, and then sodium borohydride is added and reacted in a reactor. After separation, washing, and drying, the catalyst is obtained, which can be used for the reduction reaction of nitrobenzene. The catalyst of this invention has the characteristics of high metal loading, high catalytic efficiency, and a simple preparation method, convenient operation, mild reaction conditions, and no highly hazardous compounds involved in the reaction. It avoids high-temperature reactions, reducing costs and environmental impact in industrial applications.

This utility model relates to the field of chemical production equipment technology. It provides a variable-diameter tubular reactor, comprising a reaction tube body. The internal cavity of the reaction tube body is spatially divided into a first reaction chamber and a second reaction chamber. The first reaction chamber is located below the second reaction chamber and the two reaction chambers are interconnected. The first reaction chamber has a circulating feed inlet, and the second reaction chamber has a circulating feed outlet. The tube wall of the reaction tube body has several first feed inlets and several second feed inlets, all of which are connected to the first reaction chamber and the second feed inlets are connected to the second reaction chamber. A reaction separation vessel is also provided, connected to the reaction tube body through a circulating feed inlet and a circulating feed outlet. This technical solution solves the technical problems of existing caprolactam ammonium oxime reaction systems, which suffer from numerous connected devices in the external circulation pipeline, leading to complex operation and maintenance, and the insufficient mixing effect of integrated equipment.

The invention belongs to the technical field of biological medicines, and discloses an efficient synthesis method of phenylephrine hydrochloride. The method comprises the following steps: constructing a three-phase coupling system of a water-phase biological catalytic phase, a hydrophobic organic extraction phase and a solid-phase cation exchange membrane module, catalyzing L-tyrosine by using genetically engineered bacteria or immobilized enzyme to generate phenylephrine free alkali, and performing in-situ extraction through a high-partition-coefficient organic phase to obtain phenylephrine free alkali. And transmembrane migration to a hydrochloric acid receiving cavity is driven by pH gradient to be converted into hydrochloride. The invention provides the efficient synthesis method of phenylephrine hydrochloride, which is complete in structure, strict in logic and feasible in engineering, and a dynamic decoupling reaction-separation coupling system is constructed by innovatively integrating phase transfer extraction and membrane separation technologies; the core bottleneck of product feedback inhibition which restricts biological method industrialization for a long time is overcome, and multiple targets of high yield, high purity, low energy consumption and continuous production are synchronously realized.

The application belongs to the technical field of polylactic acid production, and particularly relates to a polylactic acid intermediate reaction-separation integrated device and a reaction-separation process. The polylactic acid intermediate reaction-separation integrated device comprises a reaction tower, the reaction tower comprises a packing tower body and a plate tower body integrated together, the reaction tower is provided with a lactic acid oligomer feeding port, a tower top light component discharge port, a tower bottom heavy component discharge port and a lactide intermediate discharge port, the tower bottom heavy component discharge port is used for being communicated with a lactic acid oligomer storage system, the reaction tower is further provided with a heat exchanger, and the tower top light component discharge port is connected with a tower top condenser; the plate tower body is provided with a feeding distributor and at least two layers of staggered tower plates arranged in an upper and lower interval, and each layer of tower plate is provided with a heating pipe. The lactic acid oligomer cracking and the lactide purification are integrated in one reaction tower, two processes are combined into one process, the process flow is shortened, and the further polymerization of lactic acid oligomer and the generation of side reactions are reduced.