218 results about "Continuous crystallization" patented technology

The invention provides a sulfamic acid continuous crystallization production device and process, the sulfamic acid continuous crystallization production device comprises a filter box and a production box, the production box is fixedly connected to the upper surface of the filter box through bolts, the top end of the production box is provided with a feeding pipe, the middle part of the interior of the production box is provided with a partition plate, and the middle part of the partition plate is provided with a conveying pipe; a discharging pipe, a production reaction module and a filtering and cleaning module are arranged between the production box and the filtering box. According to the sulfamic acid continuous crystallization production device and the sulfamic acid continuous crystallization production process, in the sulfamic acid continuous crystallization production process, when sulfamic acid crystals are filtered out from mother liquor through the filter cartridge, purified water is sprayed into the filter cartridge through the spray head; and the sulfamic acid crystals can be quickly and uniformly washed to remove impurities through the filter cartridge which continuously shakes in a reciprocating manner in the rotating process, so that the continuous crystallization production efficiency of the sulfamic acid can be effectively improved.

The invention relates to the technical field of fluorination processes, in particular to a purification method of a high-purity fluorocarbonate-based solvent, which comprises the following steps: S1, introducing fluorocarbonate-based solvent crude gas into a purification cavity, and liquefying the crude gas through a liquefaction separation module; s2, separating the liquid obtained in the step S1, conveying the separated liquid into a crystallizing pond, cooling the liquid in the crystallizing pond to enter a crystallization critical state, rotating the rotating crystal plate group in the crystallizing pond, crystallizing the liquid on the surface of the rotating crystal plate group, and continuously collecting crystals above the crystallizing pond through a collecting assembly; and S3, washing and filtering the crystals collected in S2 to obtain the high-purity fluorocarbonic ester-based solvent. According to the purification method of the high-purity fluorocarbonate-based solvent provided by the invention, crude gas is liquefied by adopting the liquefaction module, and then the liquefied liquid is continuously crystallized and collected by adopting the rotary crystallization module, so that the high-purity fluorocarbonate-based solvent can be efficiently and simply prepared, and the purification method has good industrial value.

The invention relates to the technical field of fluorination equipment, in particular to high-purity fluorocarbonate-based solvent purification equipment, which comprises a purification main body internally provided with a purification cavity; the liquefaction separation module is arranged at the top of the purification cavity and is used for exchanging heat with the crude gas entering the purification cavity, so that the crude gas is liquefied and then subjected to gas-liquid separation; the rotary crystallization module comprises a crystallization pond, a rotary crystal plate group and a collection assembly, the crystallization pond is arranged below the purification cavity and used for receiving the liquefied and separated liquid phase, the rotary crystal plate group partially extends into the crystallization pond, and the rotary crystal plate group continuously rotates, so that liquid in the crystallization pond is crystallized on the surface of the rotary crystal plate group; and then the crystals are collected by the collecting assembly after rotating to the upper part of the crystallizing pond. According to the purification equipment for the high-purity fluorocarbonic ester-based solvent, the high-purity fluorocarbonic ester-based solvent can be continuously obtained in a manner of liquefying and then continuously crystallizing and collecting, so that the purification equipment has a good industrial value.

The present invention provides a continuous dynamic crystallization device and a crystallization method of lithium hexafluorophosphate, wherein the continuous dynamic crystallization device comprises a precooling device, a pressurized peristaltic device, a continuous oscillation crystallization device and a separation device connected in sequence; the continuous oscillation crystallization device comprises at least two sections of crystallization tubes connected in sequence along the material flow direction, the first section of the crystallization tube is connected to the pressurized peristaltic device, the last section of the crystallization tube is connected to the separation device, and the opening of the first section of the crystallization tube is connected to a piston; wherein, along the material flow direction, the temperature of two adjacent sections of the crystallization tube decreases in sequence. The continuous dynamic crystallization device can realize the dynamic continuous crystallization production of lithium hexafluorophosphate, and can obtain high-purity lithium hexafluorophosphate crystals with uniform particle size distribution and stable output, and continuous operation can also significantly reduce energy consumption and reduce production costs. Continuous dynamic crystallization is easy to realize automatic control, reduce manual intervention, and thus improve the safety and reliability of production.

The present invention discloses a sodium bicarbonate continuous crystallization system and process thereof, comprising a continuous crystallization tank, wherein a cooling mechanism for the flow of coolant is provided in the continuous crystallization tank, the cooling mechanism comprising a cooling mesh pipe, the cooling mesh pipe being annular, a first connecting pipe being provided at the inner ring of one side of the cooling mesh pipe, and a second connecting pipe being provided at the outer ring of the other side of the cooling mesh pipe, adjacent cooling mesh pipes being connected via the corresponding first connecting pipe and the second connecting pipe, respectively, a feed trough being provided at the bottom of the continuous crystallization tank, and a conveying mechanism for conveying the crystallized material outward being provided in the feed trough. The cooling mechanism is distributed more evenly in the continuous crystallization tank, the coolant is distributed more evenly in the continuous crystallization tank, the coolant can more fully cool down and crystallize the material in the continuous crystallization tank, and the crystallization efficiency is improved; the present invention overcomes the shortcomings of the prior art, has a reasonable design, a compact structure, and has high social use value and application prospects.

The invention provides a continuous crystallization method of block-shaped trehalose crystals, which comprises the following steps: stimulating trehalose syrup to crystallize to form seed syrup, growing the crystal at 60-65 DEG C for 1-2 hours, and then cooling and crystallizing to obtain the block-shaped trehalose crystals, the cooling crystallization is three-stage cooling crystallization and comprises the following steps: cooling to 50-55 DEG C at a cooling rate of 0.5-0.8 DEG C / h, then cooling to 40-43 DEG C at a cooling rate of 1-1.5 DEG C / h, and then cooling to 25-30 DEG C at a cooling rate of 2-2.5 DEG C / h. Compared with a commercially available trehalose product, the purity of the trehalose product is greater than 99.8%, the length-diameter ratio is less than 2: 1, the grain size of 97wt% or more seed crystals is greater than 60 meshes, the filtering time is shortened by 62.2%, the bulk density of the product is improved by 49.3%, the particles are uniform, and when the trehalose product is compounded with other products, the proportioning amount can be accurately mastered, and the quality of the compounded product is improved.

The invention provides a lithium carbonate continuous crystallization anti-scaling industrial method, a lithium carbonate crystal and application. The industrialization method comprises the following steps: S1, providing a lithium carbonate seed crystal solution, and adding the lithium carbonate seed crystal solution into a crystallizer; s2, simultaneously adding the lithium-containing solution and the sodium carbonate solution into the crystallizer, and stirring and mixing the lithium-containing solution and the sodium carbonate solution with the lithium carbonate seed crystal solution to obtain a reaction solution to be crystallized; s3, the solution to be crystallized is subjected to a constant-temperature reaction, and lithium carbonate crystals are obtained; wherein on the basis of the total mass of the lithium element in the lithium carbonate seed crystal solution and the lithium element in the lithium-containing solution, the mass ratio of the lithium element in the lithium carbonate seed crystal solution is 12.5%-30%. According to the lithium carbonate continuous crystallization anti-scaling industrial method provided by the invention, an initial site is provided for crystal nucleation through seed crystal strategy nucleation according to the heterogeneous nucleation characteristic of lithium carbonate, and lithium carbonate particles can be prevented from nucleation at the bottom or four walls of the crystallizer and further deposition and scale formation.

The utility model belongs to the technical field of industrial crystallization, and discloses a nickel sulfate continuous crystallization system. Comprising a stock solution storage tank, a pretreatment unit, a concentration unit and a crystallization unit, wherein the pretreatment unit comprises an iron remover, a filter and a preheating assembly which are sequentially communicated with a stock solution storage tank; the concentration unit comprises a forced circulation evaporator and a crystallization separator, and the crystallization unit comprises a cooling crystallizer, a cooling circulation pump, a hot crystal eliminator, a condenser, a condensed water tank, a vacuum pump, a thickener and a centrifugal machine. The nickel sulfate continuous crystallization system disclosed by the utility model is convenient to operate, high in continuous cooling crystallization efficiency and suitable for crystallization of nickel sulfate with different particle size requirements.

The invention provides a continuous crystallization method for recovering BHET monomers from waste polyester fabric alcoholysis liquid, which comprises the following steps: mixing the waste polyester fabric alcoholysis liquid with water under the action of stirring, filtering at 65-75 DEG C to form mixed liquid, and inputting the mixed liquid into a crystallization kettle for 2-4 stages of continuous crystallization. The mixed solution continuous cooling crystallization method is developed based on the complexity of the components of the waste polyester textile fabric, the problems that the conventional intermittent production process is long in time consumption and low in efficiency are solved, and the obtained BHET product is large in particle size, narrow in particle size distribution and easy to filter and dry subsequently. In addition, the invention also has the advantages of high purity, good fluidity and high stability.

The invention relates to the technical field of chemical equipment, and provides a phosphate continuous crystallization system and a phosphate manufacturing method. Comprising a monoammonium phosphate generation system, an integrated continuous crystallizer, a crystallization circulating pump, a crystallization heater, a crystallization vacuum condensation system, a crystallization material pump, a thickener and a centrifugal machine, a raw material input end of the integrated continuous crystallizer is used for being connected with a second-concentration raw material phosphoric acid and ammonia gas, or is connected with a monoammonium phosphate slurry output end of a monoammonium phosphate generation system, and a circulating material output end of the integrated continuous crystallizer is connected with a circulating material input end through a crystallization circulating pump and a crystallization heater in sequence; the crystallized material output end is connected with the input end of the centrifugal machine through the crystallized material pump and the thickener in sequence, and the centrifugal machine outputs phosphate to be dried. And process equipment for reaction, concentration, crystallization, tail gas washing and the like is not needed any more, so that the number of required equipment and the occupied area are greatly reduced, and the initial investment cost and the long-term operation cost are reduced.

The utility model discloses a potassium nitrate purification device for glass production. The potassium nitrate purification device comprises a crystallization barrel, a feeding pipe is communicated with the crystallization barrel, a discharging opening is formed in the side face of the crystallization barrel, an adjusting opening is formed in the top of the crystallization barrel, a supporting mechanism is arranged in the crystallization barrel, and a crystallization plate is arranged on the supporting mechanism. The potassium nitrate crystallization purification device overcomes the defects in the prior art, continuous crystallization treatment can be carried out on potassium nitrate in the crystallization purification treatment stage, the preparation efficiency of potassium nitrate is improved, and the potassium nitrate crystallization purification device has high social use value and application prospects.

The invention discloses a method for preparing large-particle sodium bicarbonate from sodium sulfate. The method comprises the following steps: pretreating raw materials; dynamically adjusting reaction conditions; establishing a raw material database; carrying out multistage continuous crystallization reaction; heat integration and waste heat recovery; the alkali medium is recycled; the temperature gradient design is simplified; double salt crystal separation and resource utilization, and bicarbonate radical concentration control; strengthening double salt separation by a membrane separation technology; and carrying out solid-liquid separation and product collection. In a sodium sulfate raw material dissolving stage, sodium carbonate or sodium bicarbonate is added to adjust the concentration of carbonate in a solution, so that the concentration is stabilized in a target range, ATR FT-IR is used for carrying out in-situ real-time quantitative analysis on carbonate ions in an aqueous solution, carbonate is automatically supplemented through feedback control, and the content of carbonate ions in the aqueous solution is determined. A plate heat exchanger is installed in a multi-stage reaction device, waste heat of previous-stage reaction liquid is utilized to preheat next-stage reaction liquid, and heat in mother liquor is recovered by adopting a vacuum evaporation technology in salting-out crystallization.

The invention relates to the technical field of chemical engineering, and discloses an amide oil separation and ammonium sulfate crystallization integrated device. Comprising a neutralization reactor, a settling separation tank, a pre-crystallization solution tank, a DTB crystallizer, a centrifugal machine, a settling separator, a dryer, a mother liquor tank, a condensate water tank, an amide oil decanter, an ammoximation tert-butyl alcohol tower reboiler, a mother liquor heater set, a condenser, a vacuumizing condensing unit, a stirrer set and a reactor circulating pump. The invention further comprises a process for preparing the large-particle ammonium sulfate crystal from the saturated amide oil solution, rearrangement liquid from a lactam rearrangement system and gas ammonia are added into a neutralization reactor through an external circulation pipeline, and the large-particle ammonium sulfate crystal is prepared by fully utilizing heat in the gas ammonia dissolution and neutralization reaction and crystallization process. By combining the compound additive, the seed crystal and the continuous crystallization technology, the generation of large-particle ammonium sulfate crystals is promoted, meanwhile, the crystallization process is optimized, an efficient amide oil separation and continuous crystallization mode is realized, the energy consumption is saved, and the production efficiency is improved.

The invention relates to a continuous crystallization system and method of lithium hexafluorophosphate, and belongs to the technical field of lithium ion battery electrolyte production. Aiming at the characteristics and requirements of a lithium hexafluorophosphate cooling crystallization process, the invention provides a continuous crystallization system of lithium hexafluorophosphate, which separates cooling nucleation from cooling crystallization. An ultrasonic generating device is introduced into the cooling nucleation module, lithium hexafluorophosphate is stimulated and induced by ultrasonic waves to nucleate, limitation of a metastable region is reduced, the nucleation rate is increased, crystal nuclei are controlled to be within a small particle size distribution range, meanwhile, introduction of impurities in the nucleation process is reduced, and the product purity is guaranteed. And the lithium hexafluorophosphate solution to be crystallized can continuously and uninterruptedly enter the cooling nucleation module, the cooling crystallization module and the separation circulation module in sequence, so that the continuous crystallization of the lithium hexafluorophosphate is realized, the crystallization time is greatly shortened, and the crystallization efficiency is improved.

The invention belongs to the technical field of continuous crystallization and purification, and relates to a continuous crystallization production method of 2, 2, 6, 6-tetramethyl-4-piperidylamine, which comprises the following steps: controlling the temperature of a crystallization kettle to be-10-15 DEG C, conveying a saturated or nearly saturated solution of the 2, 2, 6, 6-tetramethyl-4-piperidylamine at 55-65 DEG C into the crystallization kettle, and after the solid content in a crystallizer reaches 15-55%, cooling to room temperature to obtain the 2, 2, 6, 6-tetramethyl-4-piperidylamine. The crystal mush continuously flows into a centrifugal machine through a pipeline for solid-liquid separation, obtained crystals are washed with an organic solvent and dried, and a 2, 2, 6, 6-tetramethyl-4-piperidylamine product with the purity larger than or equal to 99.5% is obtained. The method disclosed by the invention has the advantages of improving the production efficiency, improving the product quality stability, reducing the production cost and the like, realizes continuous production of the 2, 2, 6, 6-tetramethyl-4-piperidylamine crystal, and is suitable for industrial large-scale production.

The present invention provides a concentrated crystallization tank for producing medicinal boric acid, comprising a crystallization component, wherein the top of the crystallization component is connected to a temperature control component through a water inlet pipe 1 and a water inlet pipe 2, the bottom of the temperature control component is connected to a drain pipe 1 and a drain pipe 2, the end of the drain pipe 1 facing away from the temperature control component is connected to the interior of the crystallization component, the end of the drain pipe 2 facing away from the temperature control component is connected to a power pump group, the water inlet end of the power pump group is connected to the bottom of the crystallization component through a group of water pipes, the temperature control component inputs water inside the crystallization component into itself through the drain pipe 1 and the drain pipe 2 and controls the temperature, and then returns the water to the interior of the crystallization component through the water inlet pipe 1 and the water inlet pipe 2. The present invention realizes continuous crystallization and improves crystallization efficiency. At the same time, only the water source in the trumpet tank needs to be heated, which effectively reduces energy use, and the amount of crystals contained in the solution transported by the pump group is very small, which effectively reduces the wear of the pump group.

The application discloses a continuous crystallization purification method of high-purity aluminum, which comprises the following steps: S1, pouring an aluminum-containing liquid into a crystallization crucible and controlling the temperature of the aluminum-containing liquid to be above the liquidus of the aluminum liquid; S2, slowly inserting a crystallization shaft into the aluminum-containing liquid; S3, introducing a protective gas into the crystallization crucible, stirring the aluminum-containing liquid, rotating the crystallization shaft, introducing a cooling gas into the crystallization shaft, starting crystallization, and obtaining a crystallization ingot; and S4, after the crystallization is completed, taking out the crystallization ingot from the crystallization crucible with the crystallization shaft, melting, and casting into an ingot to obtain high-purity aluminum. The method has high production efficiency, high controllability and good stability, and is especially suitable for continuous batch production.

The invention provides a system and a process for continuous crystallization synthesis of a molecular sieve, and belongs to the technical field of molecular sieve catalyst preparation methods. According to the system and the process for synthesizing the molecular sieve through continuous crystallization, raw materials for synthesizing the titanium silicalite molecular sieve are added into the long reaction tube, and the titanium silicalite molecular sieve with small grain size and uniform distribution is obtained through a crystallization reaction in a continuous flowing process in the reaction tube. In addition, a regulator is added in batches in the flow reaction process, the internal pore structure of the titanium silicalite molecular sieve is further regulated, and the titanium silicalite molecular sieve with abundant pore structures and large specific surface area is obtained.

The utility model discloses a DMPT phagostimulant continuous crystallization separation system which comprises a storage tank, the storage tank comprises a methanol tank and a concentrated solution tank, a first discharge pipe is arranged at the bottom of the methanol tank, and a first bottom valve is arranged on the first discharge pipe; a second discharging pipe is arranged at the bottom of the concentrated solution tank; a second bottom valve is arranged on the second discharging pipe; the first discharging pipe and the second discharging pipe are both communicated with a mixing unit; the crystallization unit is communicated with the outlet end of the mixing unit through a connecting pipe; and the separation unit is communicated with the outlet end of the crystallization unit through a crystal paddle pump. The continuous crystallization and separation device system solves the problems that in the prior art, the crystallization process is tedious in technology, long in crystallization time, many in three wastes and discontinuous in production process, the mixing unit, the crystallization unit and the separation unit are arranged and communicated, namely mixing, crystallization and separation are connected in series, and therefore the continuous crystallization and separation device system is formed. The continuity of the production process is ensured, and the crystallization time is shortened.

The invention provides a dynamic cooling structure and a dynamic cooling method of a triazole continuous crystallizer, and relates to the technical field of triazole crystallization, the dynamic cooling structure comprises a cooling jacket, the cooling jacket comprises an inner attaching layer, a middle cooling liquid cavity and an outer heat preservation layer, the middle cooling liquid cavity is provided with a spiral plate, and the inner attaching layer is in contact with the crystallizer; a plurality of first thermometers are axially arranged in the crystallizer, the middle-layer cooling liquid cavity is connected with a water inlet pipe and a water outlet pipe in a penetrating mode, an electromagnetic flow valve is arranged on the water inlet pipe, a controller is arranged on the crystallizer, and the controller is electrically connected with the first thermometers and the electromagnetic flow valve. The inner attaching layer is tightly attached to the crystallizer, so that the heat conduction path is shortened; a spiral plate in the middle-layer cooling liquid cavity can guide cooling water to form ordered turbulent flow, so that the temperature dead angle of a traditional cooling cavity is reduced, and the heat exchange area and the heat exchange efficiency are greatly increased; the temperature field in the crystallizer is uniformly distributed, and the overall service life of the crystallizer is prolonged.

The application discloses a production process of electroplating grade potassium pyrophosphate, which uses potassium carbonate and diaphosphorus pentoxide as raw materials, and adds a catalyst to react in a high-pressure reaction kettle. After the reaction is completed, water is added for dissolution, and the pH value of the slurry is controlled to be 9.0-10.0. After being filtered through a precision filter, the slurry is punched into a slurry storage tank, and the slurry storage tank is maintained at 75-95 DEG C. The slurry in the storage tank is punched into an evaporation and concentration device for concentration, and then the concentrated liquid is punched into a continuous crystallization device for continuous crystallization operation. After centrifugal treatment, the filtrate is recycled into the evaporation and concentration device. The potassium pyrophosphate crystals are subjected to vacuum drying treatment in a vacuum drying equipment, and then are packaged into finished products after being crushed and sieved. The potassium pyrophosphate crystals obtained by the application have high purity, less caking phenomenon, and stable and controllable product quality.

The invention discloses a continuous crystallization method and system of copper sulfate pentahydrate and a copper sulfate pentahydrate crystal, and the method comprises the following steps: S1, tangentially adding a supersaturated solution of copper sulfate pentahydrate from the bottom of a cyclone fluidized bed crystallizer to form a rotationally rising flow field in the crystallizer; s2, adding a copper sulfate pentahydrate seed crystal to enable the seed crystal to be in a suspended and fluidized state and grow; s3, mixing the copper sulfate pentahydrate mother liquor with supplemented fresh feed liquid, treating to form a supersaturated solution of the copper sulfate pentahydrate again, and returning to the step S1 for circulation; s4, process parameters of continuous crystallization are controlled, and the ratio of the feeding flow Qm to the mother liquor circulation flow Qc is not larger than 3.56%; s5, maintaining the void ratio epsilon of the bed layer to be 0.7 or above by leading out a crystal product; according to the invention, stable and continuous operation can be realized, crystal breakage and secondary nucleation are reduced, and high-purity copper sulfate pentahydrate crystals with large particle size, uniform particle size distribution and regular morphology are obtained; the production efficiency is high and the energy consumption is low.

The invention discloses a continuous crystallizer for microwave heating assisted crystallization of a water-soluble fertilizer. The continuous crystallizer comprises a steam chamber, a separation chamber, a crystallization chamber and a microwave heater. The microwave heater is adopted to replace an independent traditional heater, the characteristics of uniform microwave heating and high microwave heating speed are fully utilized, mother liquor is uniformly and rapidly heated, and the problem that crystals on a heat exchange wall are easy to deposit due to temperature gradient when a traditional DTB crystallizer works is solved; meanwhile, the problem that few crystals are generated on the inner wall of a traditional heater and then slowly deposit and even corrode the inner wall of the heater is solved. The heat insulation plate is arranged to prevent heat from being quickly diffused and conducted to the steam chamber from the separation chamber, the heat is kept to continuously heat mother liquor in the separation chamber, the evaporation process is accelerated, the supersaturation degree generation speed is increased, and the space between the inner wall and the outer wall of the continuous crystallizer is in a vacuum state so as to prevent the heat in the crystallizer from being diffused and lost to the outside. The crystallization speed is accelerated; and the production efficiency is improved.

The invention relates to the technical field of pyromellitic dianhydride crystallization, in particular to a high-purity pyromellitic dianhydride continuous crystallization production method which comprises the following steps: introducing durene gas and oxygen-enriched gas into an oxidation reactor at the same time to output pyromellitic dianhydride gas; trapping pyromellitic dianhydride crude product particles; preparing a pyromellitic dianhydride test solution; the comprehensiveness of pyromellitic dianhydride gas trapping is judged; determining a comprehensive adjustment mode according to the comprehensive judgment result, namely adjusting the pressure difference in the oxidation reactor, or determining a crystallization mode of continuous crystallization, namely determining the single feeding amount in the crystallization process, or adjusting the reset frequency of the feeding position change in the crystallization process; and continuously crystallizing the pyromellitic dianhydride solution to separate out a pyromellitic dianhydride crystal finished product. According to the invention, the crystallization efficiency is improved, and the uniformity of crystallized crystals is improved.

The utility model discloses an auger type continuous crystallization device which comprises a melting kettle, the melting kettle is provided with a stirring device, the top end of the melting kettle is provided with a material inlet and a solvent inlet, the outer wall of the melting kettle is provided with a clamping sleeve I, an inner coil pipe I is arranged in the clamping sleeve I, and a heating medium is arranged in the inner coil pipe I and communicated with a heating medium circulating device; a discharging port is formed in the bottom of the melting kettle and communicated with at least one transversely-arranged packing auger through a pump machine, a driving motor is arranged on one side of the packing auger, the power output end of the driving motor is connected with a shaft of the packing auger, blades are fixed to the shaft, a crystal mush outlet is formed in the discharging end of the packing auger, a second clamping sleeve is arranged on the outer wall of the packing auger, and a second inner coil pipe is arranged in the second clamping sleeve. And a refrigerant is arranged in the inner coil pipe II which is communicated with the refrigerant circulating device. The scheme can effectively prevent crystals from hanging on the wall and being accumulated and blocked, and improves the crystallization process efficiency.

The application provides a continuous crystallization mother liquor concentration regulation and impurity removal device and method, and belongs to the technical field of continuous crystallization equipment. A suction circulating pipe is designed outside the crystallization tank to ensure that the mother liquor fully flows in the whole continuous crystallization system, the concentration of the crystallization mother liquor is homogenized, and local supersaturation and thermal crystallization are avoided. A first inner pipe is arranged above the working liquid level in the crystallization tank to draw out the upper impurities and the accumulated light component mother liquor of the crystallization tank. In combination with the design of the open mother liquor and the impurity separation device, not only can the crystallization rate be reduced due to the too low local concentration, but also the impurities enriched at the top of the crystallization tank can be discharged, so that the influence of the impurities on the crystal quality is greatly reduced. In combination with the mother liquor parameter monitoring device arranged on the outer circulating pipe, the parameters of the crystallization mother liquor can be monitored in real time, the mother liquor extraction and circulation amount are more controllable, the crystallization environment stability is improved, and the efficient and stable generation of large particle crystals is facilitated.

The utility model discloses an efficient plate type continuous crystallizer, which comprises a main body frame, a groove body, a stirring mechanism and a cooling mechanism, the groove body is fixed on the main body frame, the stirring mechanism and the cooling mechanism are arranged in the groove body, the cooling mechanism comprises a cooling plate, a plate connecting pipe and a choked flow separation disc, according to the arrangement structure of the cooling plates, the lower end of the mth cooling plate communicates with the upper end of the (m + 2) th cooling plate through a plate connecting pipe, and m is a natural number larger than 0 and smaller than n-1. Compared with the prior art, the cooling plate has the advantages that the sequential arrangement mode of the cooling plates is changed into a more scientific poorer layered arrangement structure, so that uniform arrangement and circulation of refrigerants are realized, the temperature consistency in the crystallizer is greatly improved, the local non-crystallization condition can be effectively avoided, and the service life of the crystallizer is prolonged. And the crystallization efficiency is effectively improved.

The utility model discloses a continuous crystallizing device for preparing cannabidiol crystals, which belongs to the technical field of pharmaceutical equipment and comprises a dissolving tank, a primary crystallizing tank, a primary dryer, a primary evaporator, a primary liquid collecting tank, a secondary crystallizing tank, a secondary dryer, a secondary evaporator, a secondary liquid collecting tank, an evaporative condenser, a solvent storage tank and a connecting pipeline. A crystal washing device, a concentric forward and reverse differential mechanism, a pressing stirring paddle, an upturning stirring paddle, a scraping plate, a filter screen gate valve and the like are arranged in each of the first-stage crystallizing tank and the second-stage crystallizing tank. According to the utility model, two times of crystallization can be realized, the phenomena that the formed crystals are easy to attach to the inner wall of the crystallization tank and the crystal grains are not uniform due to the decline of the quality of raw materials during the second time of crystallization can be effectively avoided, the crystallization yield of the crystals is improved, the full-closed continuous operation is realized, the management and control risk is reduced, the equipment investment is reduced, and the production cost is reduced.

The present application relates to a method for improving the grade of potassium chloride in the process of preparing potassium chloride by using a vacuum crystallizer, comprising a potassium chloride crystallization step (S1), a fine potassium mother liquor is introduced into a DTB vacuum crystallizer for crystallization, part of small particle nuclei enter the circulating channel, are dissolved and then returned to the DTB vacuum crystallizer, and a slurry containing large particle nuclei is discharged to obtain a large particle crystal slurry; a screening step (S2), the large particle crystal slurry is screened by a first screening device to obtain a first screen oversize and a first screen undersize, a second screening device is used to screen the first screen undersize to obtain a second screen oversize and a second screen undersize; a large particle size nucleus treatment step (S3), the first screen oversize is dissolved with fresh water to obtain a targeted mother liquor, and the targeted mother liquor is returned to the circulating channel and then into the DTB vacuum crystallizer for continuous crystallization; and a small particle size nucleus treatment step (S4), the second screen undersize is returned to the inside of the DTB vacuum crystallizer for continuous crystallization. The present application can improve the grade of potassium chloride.

The invention relates to the technical field of taurine crystallization equipment, and discloses a taurine continuous crystallization device and process, the taurine continuous crystallization device comprises a crystallizer, a heater, a steam recovery system and a circulation system; the three groups of connecting units are arranged on the crystallizer, the steam recovery system is fixedly connected with the heater through the connecting units, the liquid inlet ends and the liquid outlet ends of the circulating systems are fixedly connected with the crystallizer through the connecting units, and the heater is arranged between the circulating systems; the connecting unit comprises a connecting pipe, an annular mounting plate, an annular connecting plate, a fixing assembly and a driving assembly, the connecting pipe is fixedly connected with the crystallizer, the steam heat discharged from the crystallizer can be recycled through the designed steam recycling system, the steam heat is provided for the heater again to be used for heating a solution, and therefore the purposes of saving energy and reducing consumption are achieved; and the designed fixing assembly and the designed driving assembly are matched with each other, so that the crystallizer can be conveniently and quickly mounted and connected with pipelines of the heater, the steam recovery system and the circulation system.