234results about "Solution crystallization" patented technology

The present application relates to the technical field of granulation process, and proposes a guanido acetic acid granulation process, comprising the following steps: S1, after pretreatment of the water-containing guanido acetic acid, pretreated guanido acetic acid is obtained; S2, after preliminary dispersion of the pretreated guanido acetic acid, an adsorbent is added, and after mixing and standing, a mixture is obtained; S3, after microwave crystallization treatment and post-treatment of the mixture, guanido acetic acid crystalline particles are obtained; the adsorbent is polyacrylic acid sodium, and the weight average molecular weight of the polyacrylic acid sodium is 8-12 million. Through the above technical scheme, the problems of large energy consumption, low forming efficiency and easy caking of powder in the guanido acetic acid granulation process in the related art are solved.

The utility model discloses a kind of concentrated stills with waste heat utilization effect for preservative production, including cauldron body, stirring main shaft is rotatably installed in the cauldron body, and there are several stirring auxiliary rods evenly distributed on stirring main shaft, the inside of each stirring auxiliary rod is paved with electric heating wire, motor that drives stirring main shaft rotation is installed on the cauldron body, the periphery of cauldron body is equipped with hollow sleeve, and between the exhaust port of cauldron body side wall and hollow sleeve is communicated by elbow, exhaust fan is also installed in the elbow, the bottom end of hollow sleeve is connected with water tank by exhaust pipe. The utility model can quickly discharge the heat steam generated in cauldron body into the inside of hollow sleeve by setting exhaust fan, heat steam can be used for heat preservation of cauldron body when flowing in hollow sleeve, reduce the loss of heat outside cauldron body, not only reach the effect that heat steam is discharged outside cauldron body in time, but also make full use of the heat of heat steam, and liquid water after heat steam condensation can be collected and handled uniformly by water tank.

The application relates to the technical field of chemical equipment, in particular to a purification device for 4,4'-diamino diphenyl ether production, which comprises a sectional tube frame, a purification unit, a supply unit and a discharging unit; the supply unit is fixedly arranged in the purification unit, and the purification unit is fixedly arranged in the sectional tube frame. The supply unit drives the rotation of a central shaft body, simultaneously sends air into the discharging unit, increases the pressure in the solution tank, and makes the 4,4'-diamino diphenyl ether solution in the solution tank enter the water channel, the silk mouth and the cloth distribution pipe through the liquid supply pipe and the universal joint head, finally, the solution is sprayed to the top of the heating plate through a plurality of cloth distribution holes, a thin 4,4'-diamino diphenyl ether solution cover layer is formed, the moisture in the cover layer is rapidly evaporated by using the heating function of the heating plate, and 4,4'-diamino diphenyl ether crystals are separated out, so that the 4,4'-diamino diphenyl ether can be continuously purified and the separated crystals can be continuously obtained, and therefore the separated crystals can be continuously sampled.

This utility model relates to an anti-clogging reactor for the resource recovery and preparation of ammonium sulfate from high-concentration ammonia-containing waste gas. The reactor body includes an absorption zone and a crystallization zone from top to bottom, with the crystallization zone and the absorption zone connected. The absorption zone is located above the liquid surface, and the crystallization zone is located below the liquid surface. The top of the absorption zone has a tail gas outlet, and the bottom of the crystallization zone has a crystal slurry outlet. An external Venturi reaction zone is located below the absorption zone of the reactor body, connected to the reactor body. The Venturi reaction zone has an inlet for the ammonia-containing waste gas and an inlet for the circulating absorbent liquid. The external Venturi reaction zone forms a primary absorption, reducing the intensity of the absorption reaction within the reactor and significantly improving the anti-clogging capability.

The utility model relates to a potassium nitrate crystallization device and belongs to the technical field of potassium nitrate production and processing. The device mainly comprises a tank body, a stirring assembly, a heat exchange tube group, an anti-scaling wall-scraping mechanism and a discharging assembly, a conical flow guide part is arranged at the bottom of the tank body; the heat exchange efficiency of the heat exchange tube group is enhanced through fins; the anti-scaling wall scraping mechanism removes crystals through a scraping plate; the stirring assembly optimizes liquid flowing;

This invention relates to the field of lithium extraction from lithium precipitated mother liquor, and provides a method for preparing battery-grade lithium chloride from lithium precipitated mother liquor, comprising: S1 cooling the lithium precipitated mother liquor and then performing precision filtration to remove solid particles; S2 adding a crown ether additive to the lithium precipitated mother liquor after filtration in step S1 to obtain a pretreated mother liquor; S3 performing multi-stage extraction on the pretreated mother liquor using a lithium extractant to obtain a loaded organic phase; S4 first performing multi-stage washing on the loaded organic phase with a mixed washing liquid, and then back-extracting to obtain a lithium chloride solution; S5 sequentially subjecting the lithium chloride solution to resin adsorption for oil removal and evaporation crystallization to obtain a battery-grade lithium chloride product. This method reduces sodium activity from the source by adding a crown ether additive in the extraction stage to reduce sodium co-extraction, and simultaneously adds a sodium replacement additive in the washing stage to chemically complex residual sodium ions to improve the efficiency of single-stage washing, thereby reducing the number of extraction stages and washing stages, significantly reducing equipment investment and operating costs compared to traditional processes.

The present application relates to the production field of purified terephthalic acid, and particularly relates to an oxidation process water purification treatment system and a use method thereof, which comprises an extraction tower and a rectifying device, characterized in that a separation device is arranged between the extraction tower and the rectifying device, the separation device comprises: a cooling crystallization device, a feed end of the cooling crystallization device is connected with a raffinate discharge end of the extraction tower, and the cooling crystallization device is used for cooling, crystallizing and filtering PT acid in the raffinate; a heat exchanger, a tube side feed end of the heat exchanger is connected with a discharge end of the cooling crystallization device, and the heat exchanger is used for heating the raffinate; and a filter, a feed end of the filter is connected with a tube side discharge end of the heat exchanger, and a discharge end of the filter is connected with a feed end of the rectifying device, and the filter is used for filtering residual PT acid crystallization, and the present application has the following beneficial effects: the separation device is arranged between the extraction tower and the rectifying device, the raffinate discharged from the extraction tower is cooled, crystallized and filtered, the PT acid content of the raffinate is reduced, and the product quality is improved.

The utility model relates to the technical field of stirring equipment, concretely relates to a kind of directional stirring and temperature control integrated equipment of chiral amino acid salt crystallization, including jar body, further including the lid of fixed installation in the upper side position of jar body, further including the stirring shaft of rotation connection in the inside position of jar body, two groups of stirring vane on the stirring shaft;Further including two annular capsules of fixed installation on the inner wall of jar body, two the annular capsule between keep communication, and located between two the annular capsule middle part is provided with through-hole, further including temperature sensor of fixed installation on the outer wall of jar body.Set up the annular capsule, cooperate the lap joint relationship between arc block and stirring vane, can guarantee the stability of crystallization, simultaneously cooperate the semiconductor refrigeration ring of setting, when temperature exceeds the limit, corresponding can realize the effective cooling of jar body inside, guarantee the high efficiency of crystallization.

This utility model belongs to the technical field of MVR evaporators, specifically relating to an MVR evaporation crystallization device. It includes: a forced circulation system, a hydrocyclone, a thickener, and a centrifuge. In the forced circulation system, material sequentially enters a first heater, a circulation pump, a second heater, and a separator through circulation pipes, then returns to the first heater, forming a cycle. The circulation pipes are connected to a feed pump and a discharge pump. The hydrocyclone inlet is connected to the output end of the discharge pump. The hydrocyclone overflow outlet and underflow outlet are respectively connected to a mother liquor tank and a thickener. The thickener's clear liquid overflow outlet and crystal slurry outlet are respectively connected to the mother liquor tank and the centrifuge. The centrifuge's liquid outlet and solid outlet are connected to the mother liquor tank and the outside environment. This utility model achieves equipment compactness through skid-mounted integrated design and process optimization; by using the hydrocyclone for low-concentration material intake, the thickener does not require a large buffer space, further saving space.

This invention provides a method for purifying mesitylene through suspension melt crystallization, belonging to the field of fine chemical separation technology. By adding a crystallization aid to assist in the suspension melt crystallization of mesitylene, this invention overcomes the limitations of traditional crystallization separation. The addition of the crystallization aid interacts with impurities in the crude product, effectively altering the crystallization behavior of the impurities and inhibiting their entry into the mesitylene lattice during crystal growth. This reduces the amount of impurities trapped during mesitylene crystallization, accelerates the crystallization process, and reduces the number of multi-stage crystallization. Without altering the main molecular configuration of mesitylene, this invention achieves highly efficient separation and purification of mesitylene, significantly improving its purity and yield. It solves the problem of isomer separation and overcomes the technical bottleneck of low efficiency in the existing mesitylene purification and separation process.

The utility model relates to chemical reagent production field, and disclose a kind of crystallization equipment for chemical reagent production, including support frame, the inside fixed connection of support frame has reaction kettle, the side of reaction kettle is provided with feed inlet, the bottom of reaction kettle is provided with discharge port, the top fixed connection of reaction kettle has fixed frame, the inside fixed connection of reaction kettle has connecting frame, the inside rotatably connected of reaction kettle has three and all with the rotatable shaft of connecting frame rotatably connected, the outside of three rotatable shaft is all fixedly connected with the multiple stirring rod of quantity, the outside fixed connection of intermediate rotatable shaft has the scraping frame of sliding connection with connecting frame. This crystallization equipment for chemical reagent production has the advantages that the solution in the reaction kettle can be fully stirred, and the crystallized crystals can be scraped off to prevent sticking to the wall.

The utility model relates to corn soaking water treatment technical field especially, relates to a kind of production system for preparing ammonium magnesium phosphate and inositol with corn soaking water, including the pH regulating tank being connected with corn soaking water delivery pipeline, pH regulating tank, first filter device, resin column, neutralization kettle, second filter device, hydrolysis kettle, pH adjusting kettle, third filter device are sequentially connected in proper order, the liquid outlet of third filter device is connected with decoloring kettle, concentration kettle, crystallization kettle, the crystal outlet of crystallization kettle is connected with first drying device, the discharge port of first drying device is connected with inositol storage tank;The discharge port of third filter device is connected with second drying device, the discharge port of second drying device is connected with ammonium magnesium phosphate storage tank.The above-mentioned production system system, corn soaking water is recycled, and high yield, high recovery, high-purity ammonium magnesium phosphate product and inositol product are obtained, and resource waste is avoided, and economic benefit is increased for enterprise.

This utility model relates to a low-biuret urea production system; it includes a urea synthesis section and a urea granulation tower. The urea synthesis section is connected to a crystal reheating unit via a crystallization centrifuge unit. The crystal reheating unit is connected to the urea granulation tower via an evaporator and an evaporation separator. The system utilizes the different saturation points of urea and biuret to crystallize urea, thereby removing biuret from the urea solution. Under the premise of ensuring a low biuret content in the urea crystals, urea granulation is carried out through the crystal reheating unit and other related equipment to achieve continuous production and reduce the biuret content in the urea product.

The present application belongs to the technical field of energy saving and resource utilization in titanium dioxide production, and particularly relates to a method and system for heat energy utilization of a titanium dioxide gas-powder system. The method is aimed at the problems of waste of high-temperature tail gas heat energy of the gas-powder system and high energy consumption for cold preparation in the front production process, and adopts a two-stage cooling and heat energy recovery mode of "lithium bromide refrigerating unit + cooling device". The specific steps are as follows: introducing the clean high-temperature tail gas at 220-240 DEG C after dust removal into the lithium bromide refrigerating unit, driving the preparation of cold water or ice water by using the heat energy thereof, and directly supplying the front titanium liquid freezing crystallization process; then, the tail gas enters the secondary cooling device for deep cooling to below 70 DEG C for standard emission, while the circulating water is heated to hot water at 45-55 DEG C for reuse in the water washing process. The present application realizes "waste heat" preparation of "cold" and recovery of low-level heat energy through heat energy cascade utilization, the system heat recovery rate is greater than or equal to 92%, the power consumption of the lithium bromide unit is only 1 / 10 or less of the traditional refrigeration mode, and the production cost is significantly reduced.

The present application relates to a kind of synthesis method and device of isosorbide, comprising (1) the homogeneous mixture of sorbitol aqueous solution and solid catalyst in preheater, from the upper end of membrane reactor feed, under vacuum condition reaction, product flows from the lower end of reactor;(2) the separated solid catalyst after the dissolved product of flowing out is added organic solvent, filtrate is crystallized by cooling, and the product isosorbide is prepared.The present application selects membrane reactor and combines fluorine modified solid catalyst to carry out synthesis reaction, while ensuring yield, so that water can be quickly removed from the reaction system, reduce byproduct generation, avoid catalyst blockage, and prolong the service life of catalyst.

The application relates to the technical field of lithium hydroxide production, and discloses a processing technology for preparing battery-grade lithium hydroxide, which comprises the following steps: lithium ore is crushed to a reasonable particle size and then is sent into a roasting furnace, lithium ore is destroyed through high-temperature roasting, the roasted ore clinker is sent into a reaction kettle, sulfuric acid solution is added to carry out acidification reaction, then water is added to carry out leaching, and a crude leaching solution containing lithium sulfate is obtained. The application is provided with a sealing element, the large contact area design of the L-shaped sealing strip improves the reliability of the primary sealing, the cooperation of the elastic pressing strip and the spring can effectively compensate for the slight deformation in the equipment operation process, the stability of the sealing performance is ensured, the double-sealing structure can effectively prevent the leakage of the heat exchange medium, the problems of resource waste, environmental pollution and equipment damage caused by medium leakage are avoided, the influence of cross contamination of different media on product quality is also avoided.

The application provides a continuous cooling crystallization system applied to a fluorescent whitening agent and belongs to the technical field of chemical industry. The system comprises a stirring mechanism which is used for stirring and treating materials in a stirring kettle circular cylinder and a stirring kettle conical cylinder and is connected with a driving mechanism. The stirring mechanism is provided with a scraper main body and the inner walls of the stirring kettle circular cylinder and the stirring kettle conical cylinder are flexibly attached with a micro-gap, and are not rigid and hard, so that the scraper main body can be self-adapted to the roundness error of the stirring kettle circular cylinder and the stirring kettle conical cylinder and the slight eccentricity of a stirring shaft, and the wall is scraped with light contact in the whole process, so that the friction coefficient and the friction heat production are greatly reduced, the local temperature rise of the inner wall is avoided, and the low-temperature crystallization environment is stabilized.

This invention provides an imidacloprid recrystallization refining and purification device, belonging to the technical field of purification devices. It includes a mixing chamber inner liner, with a mixing chamber outer shell fixedly installed outside the inner liner. The inner wall of the mixing chamber outer shell and the outer wall of the mixing chamber inner liner enclose a sealed heating chamber. A crystallization chamber inner liner is provided on the side of the mixing chamber outer shell, and a cooling crystallization tube is provided inside the crystallization chamber inner liner. An adaptive disturbance mechanism is provided inside the crystallization chamber inner liner. This adaptive disturbance mechanism can adjust the disturbance amplitude of the imidacloprid solution according to its crystallization degree. In this invention, by providing an adaptive disturbance mechanism, core components such as a float, a swinging linkage, a telescopic rod, and a stirring plate are integrated. The float senses the density change of the imidacloprid solution in real time at each crystallization stage, generates corresponding buoyancy based on the density, and achieves lifting and lowering. This, in turn, links the swinging linkage to swing around the slider on the limiting post, driving the telescopic rod to extend and retract radially along the sealed tube, ultimately achieving adaptive adjustment of the disturbance amplitude of the stirring plate.

This application relates to the field of nylon 6 polymerization process technology, and provides a separation system for oligomers in nylon extract, including: a feed main pipe, crystallization devices, a temperature control system, a solid-liquid separation device, a fluidized bed, and an oligomer storage tank. At least two crystallization devices are provided, each connected in parallel and connected to the feed main pipe. The discharge end of each crystallization device is connected to the solid-liquid separation device. The temperature control system is connected to each crystallization device and regulates its temperature. The solid discharge port of the solid-liquid separation device is connected to the fluidized bed, and the fluidized bed is connected to the oligomer storage tank. Through the parallel arrangement of the crystallization devices, each crystallization device operates independently, providing time for cooling and crystallization to achieve continuous production.

This waste liquid treatment method for selectively recovering boric acid from a waste liquid generated in a polarizing plate manufacturing process comprises a first membrane separation step for passing the waste liquid having a pH of 8.5 or less or the waste liquid pH-adjusted to a pH of 8.5 or less through a first separation membrane module provided with a reverse osmosis membrane to separate the waste liquid into a first permeate including boric acid (B1) and a substance (R1) other than boric acid in the waste liquid and a first concentrated liquid including the boric acid (B2) and a substance (R2) other than boric acid in the waste liquid, and a boric acid concentration crystallization step for recovering boric acid by concentration crystallization of the first permeate obtained by the first membrane separation step.

This invention discloses a method for preparing 1,6-dihydroxynaphthalene and its applications. Addressing the problems of low product purity, low yield, and wide crystal size distribution in existing technologies, this invention utilizes the spatial confinement and shape-selective effect of the MCM-41 mesoporous molecular sieve membrane to construct a coupled process of "confined nucleation within the membrane—controlled growth outside the membrane." In this method, an acidified 1,6-dihydroxynaphthalene solution is passed through an MCM-41 membrane. Utilizing the matching relationship between the pore size and the solute molecule size, molecules are forced to pre-order within the pores, lowering the nucleation energy barrier and preferentially forming highly uniform nanocrystal nuclei, while simultaneously blocking isomers and large molecular impurities. The outflowing nanocrystal seeds serve as epitaxial growth nuclei, guiding the subsequent crystallization process. This invention achieves molecular-level purification from the nucleation source, significantly shortens the induction period, and greatly improves product purity (>99.3%).

This invention relates to a crystallization apparatus for preparing lithium hexafluorophosphate, comprising: a tank body, a feeding device provided on the top surface of the tank body, and an array of heat exchange components provided on the inner wall of the tank body. The heat exchange components include several heat exchange plates disposed on the inner wall of the tank body and arranged along the length of the tank body. This apparatus can increase the heat exchange area and enhance the heat exchange efficiency, enabling the uniform and rapid precipitation of lithium hexafluorophosphate crystals, and achieving continuous production with simultaneous crystallization and scale prevention.

This application relates to the field of olefin preparation technology, and more particularly to a method and system for preparing brominated polystyrene from styrene bromine. The method includes: mixing styrene and a first solvent, then treating the mixture with a refining agent to remove impurities, obtaining styrene raw material; polymerizing the styrene raw material using an initiator, then stopping the polymerization reaction using a termination agent, obtaining crude polystyrene; washing the crude polystyrene with a detergent, then vacuum drying and pulverizing it to obtain polystyrene particles; brominating a second solvent, a catalyst, a bromine source, and the polystyrene particles to obtain crude brominated polystyrene; purifying the crude brominated polystyrene to obtain the brominated polystyrene product; the bromination reaction temperature is ≤30℃, and the bromination reaction time is ≥8h. This method first controls the polymerization reaction to regulate the molecular weight of polystyrene, and then controls the bromination reaction to regulate the molecular weight of brominated polystyrene, thus improving the controllability of the molecular weight of brominated polystyrene.

The utility model relates to crystallizer technical field discloses a kind of sodium salt continuous evaporation crystallization equipment, including crystallizing tank and receiving liquid tank, vacuumizing equipment, condenser, heater, crystallizing tank outside is fixedly connected with jacketed cylinder, crystallizing tank outside is also fixedly connected with feed end via jacketed cylinder, the lower end of crystallizing tank is fixedly connected with multiple discharge end via jacketed cylinder, feed end and discharge end are respectively communicated with the inner cavity of crystallizing tank, jacketed cylinder outside is fixedly connected with jacketed water outlet end, the lower end of jacketed cylinder is fixedly connected with jacketed water inlet end. Scraper is fixed on swingable connecting arm, and connecting arm and auxiliary arm are connected by eccentric arrangement fixed shaft, when stirring shaft reverses, scraper rotates by connecting arm with fixed shaft as axis under the action of centrifugal force and crystal pulp resistance, can be actively pasted to the inner wall surface of crystallizing tank.

The application discloses a high-salinity wastewater resource recovery system and method, and relates to the technical field of high-salinity wastewater treatment and resource recovery. The system comprises a pretreatment system, a magnesium hydroxide crystallization and granulation unit, a calcium carbonate crystallization and granulation unit, a filtering device, a desalination device, an NF nanofiltration salt separation device, an RO concentration device, a reaction device, an evaporation crystallization device and a gypsum crystallization unit. The system synchronously recovers magnesium hydroxide, calcium carbonate, sodium chloride and gypsum, realizes waste-to-resource and full resource recovery, and does not enrich organic matters through electric adsorption desalination, thereby solving the problems of membrane pollution and evaporation system fouling from the source and improving the anti-pollution capability. The system does not need expensive pretreatment such as advanced oxidation, the seed circulation crystallization reduces the addition of reagents, the evaporation water volume is greatly reduced, and the operation cost is low. The water production rate is greater than or equal to 90%, the whole process is closed-circuit circulation, there is no mother liquor, no impure salt and no hazardous waste discharge, and the system realizes true zero emission.

The present application relates to the technical field of phosphoric acid production, and particularly relates to a method and device for purifying and preparing electronic-grade phosphoric acid by using microwave temperature control technology. The method comprises the following steps: S1, using a composite impurity removal agent to perform chemical precipitation pretreatment on industrial-grade wet-process phosphoric acid, and adjusting the concentration after solid-liquid separation; S2, performing microwave temperature control concentration on the pretreated liquid at a vacuum degree of 0.085-0.095 MPa and a temperature of 160-220 DEG C to obtain a concentrated liquid with P2O5 of 85% or more; S3, performing crystallization, sweating and chelating resin ion exchange deep impurity removal on the concentrated liquid; and S4, performing decolorization, super-clean filtration and dilution and filling to obtain electronic-grade phosphoric acid finished products. The present application also provides a special device. The present application is coupled by microwave concentration and multi-stage deep impurity removal, the concentration efficiency is improved by 30%-50%, the energy consumption is reduced by more than 30%, the finished product metal impurity is less than or equal to 10 ppb, and the finished product meets the GB / T1282-2011 standard; the device adopts high-purity PTFE anticorrosion lining to avoid secondary pollution and is suitable for large-scale industrial production.

The utility model relates to the technical field of industrial production of pleuromutilin, and specifically discloses a pleuromutilin extraction system to solve the problems of low yield, insufficient purity and low efficiency of clarity treatment in the existing pleuromutilin extraction mode, which comprises a three-stage countercurrent leaching system, a double-effect evaporation system, a methanol evaporation kettle, a layered tank and a vacuum evaporation crystallization system connected in sequence from the head to the tail. The three-stage countercurrent leaching system comprises three countercurrent leaching tanks and dryers connected in series from the head to the tail, and the discharge end of the first countercurrent leaching tank and the discharge end of the second countercurrent leaching tank are both provided with a slag excavator, and the discharge end of the third countercurrent leaching tank is provided with a slag extruder. The extraction system is used for extracting and processing pleuromutilin, and the pleuromutilin has high yield, high degree of automation and high purity.

The present application relates to the technical field of sodium percarbonate preparation, and particularly relates to a sodium percarbonate production method, device and application. The method comprises the following steps: preheating centrifugal mother liquor generated in the sodium percarbonate production process to a temperature above the decomposition temperature of hydrogen peroxide to decompose the hydrogen peroxide, then evaporating and concentrating to obtain a salt-containing slurry, and performing solid-liquid separation to obtain recovered salt; mixing the recovered salt with sodium carbonate, reused mother liquor and a stabilizer to prepare an alkali liquor; adding the alkali liquor and a hydrogen peroxide preparation liquor into the reused mother liquor to perform reaction to obtain a crystal seed slurry; adding the crystal seed slurry into the reused mother liquor, and then simultaneously adding the alkali liquor and the hydrogen peroxide preparation liquor to perform reaction crystallization to obtain sodium percarbonate. The method forms a complete closed-loop production process from mother liquor treatment, salt recovery to crystal seed preparation and reaction crystallization, and has advantages in resource utilization rate, environmental protection performance, automation degree and operation economy.