175results about "Liquid-liquid reaction processes" patented technology

The invention discloses a liquid-liquid reactor based on hydrodynamic cavitation, and belongs to the field of liquid-liquid reaction of chemical production, medicine production, wastewater treatment and the like. The liquid-liquid reactor comprises a chamber A provided with a first top surface and a first bottom surface, the inner diameter of the first bottom surface is gradually reduced from top to bottom, and a first arc transition section is arranged between the first top surface and the first bottom surface; a tangential leading-in first liquid inlet pipe is arranged above the chamber A; the chamber B is a flat disc-shaped chamber; the chamber B is provided with a second top surface and a second bottom surface; the chamber B is provided with a second liquid inlet pipe which is tangentially guided in; a second arc transition section is arranged between the cavity A and the cavity B; a third arc transition section is arranged between the second top surface and the second bottom surface; a liquid outlet pipe is arranged in the center of the cavity A, and a Venturi tube structure is arranged in the liquid outlet pipe; a flow guide piece is arranged in the center of the cavity B; the outer diameter of the flow guide piece is gradually reduced from bottom to top; and the flow guide piece is provided with an end part which is inserted into the liquid outlet pipe. According to the ultrasonic cavitation device, the defects that ultrasonic cavitation equipment adopted in production at present is higher in energy consumption and smaller in equipment size amplification are overcome, and the cavitation equipment is changed from research to industrialization.

The present application discloses a method for preparing an ethylene-vinyl alcohol copolymer and a system for preparing an ethylene-vinyl alcohol copolymer, wherein the method comprises hydrolyzing an ethylene-vinyl acetate copolymer in a solvent containing alcohol and water in the presence of a catalyst to prepare a reaction product containing an ethylene-vinyl alcohol copolymer.

Described is a continuous process for producing a polycarbonate in a plant comprising a mixing vessel, a pre-transesterification reactor, at least two transesterification reactors, at least one pre-polycondensation reactor and a final polycondensation reactor connected in this order, wherein the process comprises the following steps: a) mixing a melt of bisphenol with diaryl carbonate in the mixing vessel to form a raw material melt, b) adding transesterification catalyst to the raw material melt to form a raw material melt mixture, c) pre-transesterfying the raw material melt mixture in the pre-transesterification reactor at a pressure of equal to or above 1 bar(a) to form a partially transesterified reaction mixture, d) continuing transesterification of the partially transesterified reaction mixture in the transesterification reactors at a pressure of below 1 bar(a) to form a transesterified reaction mixture, e) polycondensing the transesterified reaction mixture in the pre-polycondensation reactor(s) at a pressure of below 1 bar(a) to form a pre-polycondensation product, and f) continuing the polycondensation of the pre-polycondensation product in the final polycondensation reactor at a pressure of below 1 bar(a). The process of the invention improves the robustness and / or flexibility of the polycarbonate production and enables production of high quality polycarbonate.

The invention discloses a Venturi type micro-droplet generation device and a micro-droplet generation method thereof, and relates to the technical field of liquid-liquid heterogeneous reaction devices. The device comprises a venturi tube and a feeding tube, the venturi tube is used for conveying a first liquid phase, the venturi tube is internally provided with a venturi flow channel of a cavity structure, the venturi flow channel is divided into a contraction section, a throat pipe and an expansion section which are sequentially communicated, a feeding port is formed in the side wall of the throat pipe, a partition plate is arranged in the throat pipe, the height of the partition plate is equal to the length of the throat pipe, and the feeding port is communicated with the venturi flow channel. The interior of the throat pipe is divided into a plurality of flowing cavities by the partition plates, and each flowing cavity is communicated with the feeding hole; the feeding pipe is used for conveying a second liquid phase, and the feeding pipe is communicated with the flowing cavity through the feeding opening, so that the first liquid phase and the second liquid phase collide with each other in the flowing cavity and are sheared to generate micro-droplets. The partition plates are arranged to divide the throat pipe into a plurality of flowing cavities, and the turbulence and shearing degree in the throat pipe is improved by fully utilizing the wall surface effect.

The present invention relates to reactors and reactor components which have good resistance to NH3 and N2 and possibly to H2O at high temperatures and moderate pressures and thus can be used in industrial-scale reactions for the catalytic decomposition of NH3 into N2 and H2.

The invention belongs to a production system and a production process of sodium methoxide. Comprising a sodium methoxide reaction tower, a methine solution pipeline, a refined methanol pipeline and a sodium methoxide storage tank, the methine solution pipeline is connected with an inlet in the upper portion of the sodium methoxide reaction tower through a tube pass of a methanol reaction tower kettle liquid heat exchanger, and a liquid phase outlet in the bottom of the sodium methoxide reaction tower is connected with an inlet of a sodium methoxide reaction tower kettle liquid evaporator; a liquid phase outlet of the sodium methoxide reaction tower kettle liquid evaporator is connected with a sodium methoxide storage tank through a methanol reaction tower kettle liquid heat exchanger shell pass; the refined methanol pipeline is connected with a lower gas-phase inlet of the sodium methoxide reaction tower through a tower top heat exchanger shell pass of an amide rectifying tower in the amide production unit, and the refined methanol pipeline is connected with a lower gas-phase inlet of the sodium methoxide reaction tower through a bottom liquid heat exchanger tube pass of a methanol rectifying tower in the amide production unit; according to the thermodynamically coupled sodium methoxide-amide collaborative production system, a cross-device energy and material collaborative network is constructed, so that the double breakthrough characteristics of energy conservation and product quality improvement are realized.

The invention provides a novel technology for concentrating dried waste sulfuric acid of a chloromethane synthesis device. According to a traditional sulfuric acid recovery process, waste sulfuric acid and water are mixed and hydrolyzed, then rectification and concentration are carried out, during hydrolysis, the waste sulfuric acid usually needs to be diluted to the concentration of about 50%, a large amount of introduced water needs to be removed during rectification and concentration, and steam consumption is huge. The process provided by the invention is as follows: waste sulfuric acid after drying and impurity removal in chloromethane synthesis firstly exchanges heat with concentrated high-temperature concentrated sulfuric acid and then enters a rectifying tower 1, 96% concentrated sulfuric acid is extracted from the tower bottom, most sulfuric acid in the waste sulfuric acid is recovered, and a gas phase at the tower top contains moisture, a small amount of sulfuric acid and organic matters (dimethyl sulfate and the like) and the like. The method comprises the following steps: condensing a gas phase at the top of a rectifying tower 1, mixing with a certain proportion of water, feeding into an upper tower 2 of a hydrolysis tower, hydrolyzing dimethyl sulfate and methyl hydrogen sulfate into sulfuric acid and methanol, removing part of organic matters and water through an upper tower heater, feeding the sulfuric acid in a tower kettle into a lower tower 3 of the hydrolysis tower, and concentrating to 96% through vacuum rectification.

The invention relates to an improved process for the manufacture of a fluorinated organic compound, wherein the process comprises a fluorination reaction of an organic precursor compound having at least one chlorine substituent and / or at least one double bond, and said organic precursor compound is reacted in liquid phase in HF (hydrogen fluoride) serving as solvent and fluorinating agent in the presence of a fluorinating catalyst, and wherein the fluorination reaction is performed in liquid phase in a SiC block chemical reactor, and wherein the reaction mixture is withdrawn from SiC block chemical reactor, and wherein the process comprises optionally isolating and / or purifying the targeted fluorinated organic compound.

This reaction device includes a fluid mixer for generating a reaction product via a coupling reaction from raw materials containing at least one substrate, a metal catalyst, and an organic solvent. The fluid mixer constitutes a liquid contact constituent part for distributing the raw materials separately into a first fluid and a second fluid and mixing the first fluid and the second fluid at an end of the liquid contact constituent part, and comprises a first cylindrical body and a second cylindrical body that is disposed so as to form a double tube on a portion inside the first cylindrical body. The first fluid can flow between the inner wall of the first cylindrical body and the outer wall of the second cylindrical body, the second fluid can flow into the second cylindrical body, and the first fluid and the second fluid are brought into contact with each other at the tip of the second cylindrical body at the end of the liquid contact constituent part. The first fluid contains an organic solvent and one among the raw materials dissolved or dispersed in the organic solvent, and the second fluid contains an organic solvent and the remainder of the raw materials dissolved or dispersed in the organic solvent.

The invention provides a pipeline premixer, a multi-component liquid-phase reactant pipeline premixing system and method and application of the pipeline premixer and the multi-component liquid-phase reactant pipeline premixing system and method. The pipeline premixer is used for pre-mixing multi-component liquid phase reactants and sequentially comprises a variable-pitch spiral flow guide section, a spiral flow guide section, a spiral flow guide section and a flow guide section in the fluid direction, and the variable-pitch spiral flow guide section is used for increasing the fluid Reynolds number to a turbulent flow area; the multi-taper-hole shear plate section is used for shearing fluid so as to generate a local cavitation effect; and the helical tooth staggered mixed grid section is used for enabling the fluid to generate a Karman vortex street. Compared with the prior art, the pipeline premixer, the multi-component liquid phase reactant pipeline premixing system, the method and the application have the advantages that molecular-level uniform mixing of multi-component reactants is realized by arranging the variable-pitch spiral flow guide section, the multi-taper-hole shear plate section and the helical-tooth staggered mixing grid section; therefore, the problem of non-uniform component distribution caused by mixing delay in the kettle can be solved.

The application provides a low-temperature methanol washing and urea generation combined energy-saving system and method, comprising a feed heat exchanger, a cooling separation unit, an absorption tower, a liquid phase treatment unit and a urea synthesis unit, each unit cooperatively realizing process deep integration and energy coupling; the application takes the purified reflux liquid phase CO2 as the cooling source of the cooling separation unit, without external refrigeration, reducing low-temperature methanol washing cooling source consumption, also reducing the absorption tower treatment load, reducing its energy consumption, equipment investment and CO2 emission; the product liquid phase CO2 is directly supplied to the urea synthesis after cold energy recovery through the heat exchanger, replacing the traditional CO2 gas pressurization process, eliminating the secondary energy consumption of transportation. The multi-channel heat exchanger realizes cold energy step-by-step utilization, improving the overall energy efficiency. The application realizes self-provided cold energy and efficient energy recovery, achieves CO2 resource utilization, simplifies the process and reduces the maintenance cost, and the system is economic and environmentally friendly, and is suitable for industrial application of coal chemical industry and chemical fertilizer production.

Methods and systems for the controlled production of aqueous halogen solutions with varying compositions are disclosed. According to an embodiment, aqueous solutions of hypochlorite ions are modified through the sequential addition of pH adjusting chemicals, non-chloride halide ions, and halogen stabilizing compounds. Sensors, for measuring physical and chemical properties of the solutions as they change due to the impact of the various chemical reactions, are linked to a control system which, in turn, can control the input of one or more chemicals. The control system facilitates the production of a solution with desired characteristics in terms of pH, specific halogen composition, degree of halogen stabilization, and limiting the production of undesired by products such as bromate ions.

A method and system for dehydrogenating ethylbenzene can include mixing a steam stream and an ethylbenzene stream to form a feed mixture. The ethylbenzene / steam feed mixture can then be fed into a dehydrogenation reactor containing an alkali metal promoted catalyst. A liquid selected from an alkali metal liquid, an alkali metal compound liquid, or a liquid solution containing an alkali metal can be injected into a feed stream (such as the steam stream, the ethylbenzene stream, or the ethylbenzene / steam feed mixture). After injection, the liquid vaporizes and disperses into the feed stream upstream of the dehydrogenation reactor. The liquid can remain liquid from a point upstream of the injection to the injection nozzle. The liquid is dispersed in liquid form through the injection nozzle to form liquid droplets dispersed in the feed stream, which evaporate and / or dissolve into the vapor feed stream.

The invention relates to the technical field of blasting dust fall, in particular to a blasting dust fall device which comprises a base, an annular spraying disc, a rotary guide cylinder, a rotary cylinder, a liquid pushing block and a sealing cover, premixed liquid and a gas-producing reactant are stored through sub-cavities, and rapid mixing of components is achieved through a rotary triggering structure. During use, the limiting plug pin is pulled out, the rotating cylinder is screwed, the liquid storage cavity is made to communicate with the liquid guide groove, the liquid pushing block accelerates liquid discharge, sodium bicarbonate and citric acid are triggered to react to generate a large amount of foam, and the foam is evenly sprayed out along the annular flow channel to cover an explosion area. The device solves the problems of slow foaming and complex operation of a traditional dust falling device, realizes rapid foaming, reduces water consumption, and has the advantages of rapid reaction, efficient dust falling, stable structure and the like.

The utility model discloses a chloromethane byproduct sulfuric acid decolorizing device which comprises a sulfuric acid storage tank and a chlorine water storage tank, the sulfuric acid storage tank and the chlorine water storage tank are both communicated with a mixer arranged at the downstream and are used for mixing and diluting the sulfuric acid storage tank and the chlorine water storage tank, the mixer is communicated with a blow-off tank arranged at the downstream, and the upper parts of the mixer and the blow-off tank are communicated with a tail gas treatment device. And a filter is arranged at the downstream of the blow-off tank to filter insoluble substances and then enters a dilute sulphuric acid storage tank at the downstream. The chloromethane byproduct sulfuric acid and the chlorine water are mixed and diluted, coloring organic matters in the sulfuric acid are oxidized and faded by free chlorine through the chlorine water, residual chlorine in the dilute sulfuric acid is blown out through compressed air, a colorless and odorless dilute sulfuric acid solution is obtained, and the decolorizing device is simple in equipment, simple in process flow and low in operation cost.

The present disclosure relates to a system for the production of silicon tetrafluoride. In one implementation, a reactor is configured to at least convert fluorosilicic acid (FSA) into silicon tetrafluoride at a reaction zone. A separator receives the products of the reactor and is configured to separate the products into at least a gaseous stream and a liquid stream. At least one additional reactor is configured receive the at least a liquid stream of the reactor and configured to yield a refined product at a reaction zone. At least one additional separator is configured to separate the refined product into at least a gaseous stream and a liquid stream at a separating zone. Finally, a washer is configured to receive and wash the gaseous stream of the product and the gaseous stream of the refined product at a washing zone, wherein the washer yields a purified silicon tetrafluoride product.

The reaction of sodium hypochlorite with sodium bromide is slow, and commonly only part of the bromide is converted to hypobromite. Methods to accelerate the reaction by adding a regulated amount of acid to a solution comprising bleach and bromide are provided, whereby the yield of hypobromite can be increased. The amount of acid added can be predetermined based on the content of a base in the bleach, and acid can be added to neutralize the base. The amount of acid added can be based on a measured parameter of the reaction that is indicative of reaction kinetics. For example, the amount of acid can be actively controlled by measuring pH, absorbance of visible or near Ultraviolet light, or temperature of the reacting solution and adjusting acid.

This application discloses a process and apparatus for the continuous preparation of lithium difluorooxalate borate, relating to the field of lithium salt additive preparation technology. The process mainly includes a pretreatment step, a continuous reaction step, and a spray drying step. Specifically, it includes: preparing an oxalic acid solution and dehydrating the oxalic acid solution to obtain a dehydrated oxalic acid solution with a moisture content of less than 20 ppm; continuously pumping a lithium tetrafluoroborate solution, trimethylchlorosilane, and the dehydrated oxalic acid solution into a spiral pipe reactor for reaction to obtain a lithium difluorooxalate borate reaction solution; and spray drying the lithium difluorooxalate borate reaction solution to remove organic solvents, obtaining crude lithium difluorooxalate borate. This application precisely controls the moisture content in the raw materials, enabling large-scale continuous production and effectively avoiding the problems of caking and sticking to the walls during the drying process. It also solves the problems of corrosion caused by excessive moisture and low drying efficiency in the preparation of lithium difluorooxalate borate, thus improving production efficiency and product yield.

The present application relates to the field of liquid-liquid two-phase reaction, and discloses a kind of liquid-liquid two-phase reaction method, liquid-liquid two-phase reaction device and application, the method includes: in the one side of permeation medium and set up the first region containing first reactant, in the other side of permeation medium and set up the second region containing second reactant;The pressure P1 of setting the first region is less than the pressure P2 of the second region;Under the action of pressure difference between pressure P1 and pressure P2, the second reactant passes through the permeation medium, contacts the first reactant and reacts;The first reactant is the first liquid phase reactant, and the second reactant is the second liquid phase reactant.The method provided by the present application controls the suction force between the two-phase reaction zone, and then controls the reaction speed, ensures that the reactants are efficiently mixed and reacted, shortens the total reaction time, does not need to dilute the reactants by a large multiple, effectively reduces the cost of reactant materials, and improves the reaction efficiency.

A uniform flow distribution device including a single substrate provided having flow channels connecting one inlet and a plurality of outlets. The flow channels include a flow distribution section configured to distribute a liquid introduced into the inlet of the substrate into a plurality of branch flow channels that connect to the outlets, and a flow resistance section that is located downstream of the flow distribution section and configured to provide flow resistance to each of the branch flow channels.

The invention relates to the technical field of liquid-liquid reaction, is suitable for chemical reaction of gas generated by liquid-liquid reaction, and particularly discloses a liquid-liquid two-phase reaction device which comprises a reaction tube, a feeding tube is mounted at the top of the reaction tube, and a first reactor is arranged in the reaction tube and located below the feeding tube. Continuous reaction discs are arranged in a tube body below the first reactor in the reaction tube in a staggered manner; reaction liquid is continuously introduced into the feeding pipe, so that the reaction liquid overflows out of the first reactor and then enters the continuous reaction disc for step-by-step reaction; a gas outlet is formed in the top of the reaction tube and is used for discharging a gas product generated by reaction; and the bottom is provided with a waste liquid outlet for discharging reacted waste liquid. The number of the feed ports can be adjusted according to liquid types, and the reaction kettle is suitable for reaction of various liquids; the first reactor and the continuous reaction disc are designed in the reaction tube, so that the reaction efficiency and the product purity are improved; a waste liquid outlet is formed in the lower part of the reaction tube, so that the reaction can be continuously carried out and the experiment efficiency is improved.

The utility model relates to a continuous rotating liquid film reactor. It includes a frame with a frame top plate installed on the top, and a reaction tank structure is installed on the frame; it also includes a guide sleeve mounting frame installed on the frame top plate, a guide sleeve mechanism penetrating the reaction tank structure is installed on the guide sleeve mounting frame, a hollow spline shaft is passed through the guide sleeve mechanism, a passage rotary joint is installed on the upper end of the hollow spline shaft, and a feeding reaction device is installed on the lower end of the hollow spline shaft; it also includes a rotating drive device installed on the frame, which is used to drive the hollow spline shaft to rotate, and it also includes a lifting drive device installed on the frame, which is used to drive the hollow spline shaft to lift and move; the feeding reaction device includes a feeding barrel, and a feeding installation port connected to the lower end of the hollow spline shaft is connected to the top of the feeding barrel, and a plurality of discharge holes are opened on the outer peripheral wall of the feeding installation port, and a permeable membrane is arranged on the inner wall of the feeding barrel. The utility model can ensure the mass transfer reaction of liquid-liquid two-phase substances, and has high mass transfer and reaction efficiency and small footprint, and is easy to operate and has strong continuity of operation.

The application discloses an immersed self-suction type rotating packed bed, which comprises a motor, a shell, a liquid inlet, a rotor assembly, a stator and a liquid outlet; the rotor assembly comprises a rotor, a composite filler impeller, a first rotating shaft and a second rotating shaft; the rotor is fixedly connected with the output shaft of the motor through the first rotating shaft; the second rotating shaft is coaxial with the first rotating shaft and is arranged on the opposite side of the first rotating shaft, and the top end of the second rotating shaft is rollingly sleeved with the shell; the second rotating shaft is a hollow channel structure, and the end of the liquid inlet is connected with the hollow channel of the second rotating shaft; the composite filler impeller comprises annular fillers, inner vanes and outer vanes; the inner vanes are fixedly arranged on the inner side of the annular fillers, and the outer vanes are fixedly arranged on the outer side of the annular fillers. The rotating packed bed has the mixing characteristics of the rotating packed bed and the conveying characteristics of the centrifugal pump, and as a pre-reactor, the material can reach the best mixing state before entering the main reactor.

A flow reactor that mixes a first and a second fluid, wherein the first fluid flows toward a first tip between an inner wall of a first inner tubular portion and an outer wall of a second inner tubular portion, the second fluid flows toward a second tip inside the second inner tubular portion, a third fluid having low affinity for the first and the second fluid flows toward a downstream end between an outer wall of the first inner tubular portion and an inner wall of an outer tubular portion, the second tip of the second inner tubular portion does not protrude further to the side of the downstream end than the first tip of the first inner tubular portion, and the first tip is located closer to the side of the upstream end than the downstream end when viewed from a direction orthogonal to the flow direction.

The utility model provides a production device for synthesizing TBTD in one step, which comprises a reaction kettle, a di-n-butylamine adding pipeline, a hydrogen peroxide adding pipeline, a carbon disulfide adding pipeline, a soft water adding pipeline, a carbon disulfide gas discharging pipeline and a nitrogen pipeline are arranged at the top end of the reaction kettle, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of a condenser. A condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, and the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump; hydrogen peroxide is adopted as an oxidizing agent, so that high-salinity wastewater discharge is reduced; the reaction liquid is washed with water for many times to remove residual alkali liquor and byproducts, water is used as a solvent to replace a traditional methanol / ethanol system, and emission of VOCs is reduced; the metering pump is used for dropwise adding materials, so that automatic sealing feeding is realized, and harm to bodies of workers is reduced; carbon disulfide is recycled for next reaction, so that the material loss is reduced, and the pollution problem in the subsequent treatment process is reduced.

The invention relates to a specific type of reactor (1) designed to perform chemical synthesis processes, for use in the production of cathode active materials for lithium-ion batteries.

The present invention relates to a method for removing impurities from nitrated crude products obtained during the nitration of nitratable aromatic compounds, after removal of the final nitrating acid, by treatment with a washing medium, and also to a plant or apparatus suitable for implementing this method. Further provided by the invention is a production plant for the nitration of nitratable aromatic compounds, with subsequent purification of the nitrated products.

Disclosed are a method of preparing an ethylene vinyl alcohol copolymer comprising hydrolyzing an ethylene vinyl acetate copolymer in the presence of a catalyst in a solvent containing alcohol and water to prepare a reaction product containing an ethylene vinyl alcohol copolymer, and a system for preparing an ethylene vinyl alcohol copolymer.

The utility model relates to the technical field of preparation of anhydrous hydrogen fluoride from fluosilicic acid, in particular to a fluosilicic acid concentration system for anhydrous hydrogen fluoride production, which comprises a fluorine-containing waste gas scrubber group, a dilute fluosilicic acid feeding tank, a fluosilicic acid concentrator group and a silicon dioxide separation tank which are connected in sequence, and a liquid phase outlet at the bottom of the silicon dioxide separation tank is also connected with a fluosilicic acid concentrator through a concentration circulating pump. The system disclosed by the utility model is simple, low in investment and operation cost, high in absorption rate of SiF4 gas, energy-saving and consumption-reducing.