133 results about "Continuous crystallization" patented technology

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 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 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 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 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 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 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 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.

To provide a fully-continuous synthesis method of glyphosate.SOLUTION: In the present invention, high-purity glyphosate is prepared by using a fully-continuous system in which a feed pump, a plurality of micromixers, a plurality of microchannel reactors, a dynamic rotary reactor, a buffer tank, a back pressure valve, a continuous reaction-kettle-type reactor, and a continuous crystallizer are sequentially connected, in which glycine is used as a raw material.EFFECT: According to the present invention, stable fully-continuous industrial production is achieved, no external intervention is required during the process, the efficiency of time and space is high, the number of operators and the labor intensity are greatly reduced, the production cost is greatly reduced, complicated operations in the conventional reaction-vessel process, a rapid rise of temperature in the kettle and the risk of material ejection are avoided, production safety is improved, the quality of glyphosate products is ensured, the operation of the apparatus is stable, the reaction time is short, the reaction yield is high, and the quality of the product is stable.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of pharmaceutical equipment, in particular to continuous crystallization temperature control equipment for tilpotide. According to the technical scheme, the temperature control device comprises a temperature control machine and further comprises a rotating groove formed in the top of the temperature control machine, and an oil filling port is formed in the inner bottom wall of the rotating groove; the refueling funnel is rotationally connected into the rotating groove; the rotating rod is fixedly connected to the outer wall of the middle of the oil filling funnel, and a rotating groove is formed in the temperature control machine. Through cooperation of the rotating groove, the oil filling port, the oil filling funnel, the rotating groove, the rebounding mechanism, the anti-reversion mechanism and other structures, the temperature controller and the oil filling funnel are integrally designed, during oil filling, an oil inlet of the oil filling funnel can be rotated to be overlapped and communicated with the oil filling port, and the funnel does not need to be additionally taken and placed; after use, the anti-reversion mechanism is opened, and the rebound mechanism automatically resets to close the funnel, so that residual oil is prevented from being exposed, the cleaning requirement is reduced, and the problems of cleaning, pollution and equipment operation risks caused by the use of additional refueling equipment are solved from the source.

The invention discloses a battery grade ferrous sulfate continuous cooling crystallization method and system based on a crystal form directing agent, and the method comprises the following steps: mixing a purified ferrous sulfate solution with a nanoscale CHA / MOR molecular sieve crystal form directing agent, feeding the mixture into a multi-stage continuous crystallization kettle, carrying out temperature control crystallization, and finally carrying out solid-liquid separation to obtain a product, the system correspondingly comprises a crystallization kettle, a crystal form guiding agent and a seed crystal adding unit which are connected in sequence, the crystal morphology is actively regulated and controlled by utilizing the specific crystal form guiding agent, and the high-tap-density columnar crystal is obtained; an electric field is arranged in a crystallization transition area, so that in-situ directional migration and deep removal of foreign ions are realized; a crystal form memory elimination module is integrated, impurity circulation is broken through rapid freezing-instantaneous heating, efficient and energy-saving deep purification is achieved, the problems that in battery-grade ferrous sulfate production, the crystal morphology is uncontrollable, the impurity content is high, the technological process is long, and energy consumption is large are synchronously solved, and the product is high in purity and good in physical performance; the method is especially suitable for preparing a lithium ion battery positive electrode material precursor.

An improved wall scraping type hollow plate piece cooling continuous crystallization machine, including a shell, the shell is provided with a central shaft, a plurality of cooling plate pieces and a plurality of wall scraping assemblies, any one wall scraping assembly includes a mounting sleeve, a support and a scraper, the mounting sleeve is fixedly installed on the outer side of the central shaft, the mounting sleeve is connected with one end of at least one support, the side of the support towards the cooling plate piece is provided with a groove, the rear end of the scraper is deeply into the groove, the bottom surface of the groove is fixedly provided with a guide column, the rear end of the scraper is provided with a guide hole, the guide column is inserted into the guide hole, the guide column is sleeved with a spring, and the scraper is biased to the cooling plate piece by the spring. The rear end of the scraper is arranged in the groove of the support, so that the scraper can move towards the cooling plate piece, and the spring is arranged between the scraper and the bottom surface of the groove, so that the surface of the cooling plate piece can be pressed during the rotation of the scraper, and the crystal grains at the position passed by the scraper are completely scraped off.

A continuous phosphate crystallization system and a phosphate manufacturing method. The continuous phosphate crystallization system comprises a monoammonium phosphate production system (100), an integrated continuous crystallizer (7), a crystallization circulation pump (9), a crystallization heater (10), a crystallization vacuum condensation system (11), a crystallization material pump (12), a thickener (13), and a centrifuge (15), wherein a raw material input end of the integrated continuous crystallizer (7) is configured to be connected to a raw material phosphoric acid of a second concentration and an ammonia gas, or to be connected to a monoammonium phosphate slurry output end of the monoammonium phosphate production system (100), a circulating material output end of the integrated continuous crystallizer (7) is connected to a circulating material input end by means of the crystallization circulation pump (9) and the crystallization heater (10) in sequence, a crystallized material output end is connected to an input end of the centrifuge (15) by means of the crystallization material pump (12) and the thickener (13) in sequence, and the centrifuge (15) outputs a phosphate to be dried. The method comprises: delivering a raw material phosphoric acid of a first concentration in the range of 40-58% to the monoammonium phosphate production system (100) to obtain flash steam and a monoammonium phosphate slurry, and delivering the monoammonium phosphate slurry into the integrated continuous crystallizer (7) to obtain a crystallized material; or, delivering a raw material phosphoric acid of a second concentration in the range of 75-85% and an ammonia gas into the integrated continuous crystallizer (7) to obtain a crystallized material; and sequentially performing thickening, centrifugation and drying on the crystallized material to obtain a phosphate.

The application provides a continuous crystallization method of lithium hexafluorophosphate, an electrolyte and a lithium ion battery. The continuous crystallization method comprises the following operation steps: introducing a lithium hexafluorophosphate crude product solution into a negative pressure evaporator; introducing the lithium hexafluorophosphate crude product solution concentrated by the negative pressure evaporator into a crystallization kettle, adding nano magnetic particles into the crystallization kettle, and continuously cooling the lithium hexafluorophosphate crude product solution; filtering the mixed solution discharged from the crystallization kettle, drying to obtain a lithium hexafluorophosphate crude product, dissolving the obtained lithium hexafluorophosphate crude product with an organic solvent to obtain a lithium hexafluorophosphate organic solution, making the lithium hexafluorophosphate organic solution flow through an adsorption device provided with an electromagnet device, performing crystallization operation on the separated lithium hexafluorophosphate organic solution, and obtaining a finished product of lithium hexafluorophosphate. The continuous crystallization method effectively shortens the crystallization time and improves the production efficiency.

The invention provides a method for continuously crystallizing 4, 4 '-diaminodiphenylmethane. The method comprises the following steps: mixing a 4, 4 '-diaminodiphenylmethane crude product with a solvent, enabling the mixture to sequentially pass through a 1 # crystallization kettle, a 2 # crystallization kettle, a 3 # crystallization kettle, a 4 # crystallization kettle and a 5 # crystallization kettle at a set flow rate, and finally enabling the mixture to enter a centrifugal machine for solid-liquid separation to obtain the high-purity 4, 4'-diaminodiphenylmethane. The kettle-type continuous crystallization is realized, the crystallization efficiency is improved, the crystallization temperature change can be effectively controlled, the product crystal form is good, and the product purity is high.

This invention discloses an apparatus and method for detecting anomalies in a continuous crystallization process. These are corresponding solutions, in which: image analysis methods are used to extract the color information of each pixel in the crystallization image; based on the color attributes of each pixel in the image, principal component analysis is used to extract principal components; these principal components comprehensively consider the correlation between the color attributes of different pixels and can reflect the essential features of the image; based on the principal components, a multivariate statistical process control model can be constructed, thereby enabling real-time detection of the state of new continuous crystallization process images. Overall, the above-mentioned solutions provided by this invention can effectively support the automation and intelligent development of continuous crystallization process state detection.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a device for fully continuously synthesizing diclofenac sodium. A multi-step continuous reaction system is adopted, and continuous production of diclofenac sodium is achieved through a feeding pump, a mixer, a micro-channel reactor, a rotary dynamic reactor, a buffer tank, a back pressure valve, a continuous kettle type reactor and a continuous crystallizer which are sequentially connected. The device can ensure the consistency and stability of product quality, and is high in integration degree, small in occupied area for production and high in unit productivity. Meanwhile, the yield can be adjusted according to requirements, the amplification effect existing in a traditional kettle type process is avoided, and the reagent dosage and three-waste emission can be reduced. Compared with the prior art, the method has the advantages that the quality stability is obviously improved, and the production cost is also reduced.

The application discloses a kind of microwave heating auxiliary crystallization water-soluble fertilizer's continuous crystallizer, including steam chamber, separation chamber, crystallization chamber and microwave heater.Microwave heater is used instead of separate traditional heater, make full use of the characteristics of microwave heating uniform and fast, uniformly and quickly heat mother liquor, solve the problem that heat exchange wall crystal is easily deposited when traditional DTB crystallizer works due to temperature gradient;At the same time, solve the problem that a small amount of crystallization is generated in the inner wall of traditional heater and then slowly deposited or even corroded the inner wall of heater.Set up heat insulation board to prevent heat from separation chamber quickly spread and conduct to steam chamber, retain heat in separation chamber to continuously heat mother liquor, speed up evaporation process and the speed of supersaturation, the inside and outside wall of continuous crystallizer is in vacuum state, to avoid heat in crystallizer diffuses and loses to outside, improve heat energy utilization and speed up crystallization speed, improve production efficiency.

The invention relates to the technical field of crystallization equipment, in particular to centrifugal anti-blocking gas-liquid separation continuous crystallization equipment. According to the technical scheme, the device comprises an evaporative crystallization system and a gas-liquid separation system integrated in a scrubber tank. A high-speed rotating centrifugal separation mechanism is adopted to replace a traditional wire mesh demister, efficient gas-liquid-solid separation is achieved through centrifugal force, and the problem of blockage caused by crystal attachment is fundamentally solved. The gas-liquid separation system is provided with a mechanical liquid discharge structure which can be automatically opened and closed and has a self-dredging function, and a differential adjusting mechanism which can generate a rotating speed difference to realize online scale scraping and blockage clearing. The device realizes continuous, efficient and stable purification of crystal-containing steam, effectively protects key equipment such as a compressor, ensures complete closed-loop recovery of mother liquor, has the advantages of strong anti-clogging performance, high separation efficiency, automatic operation and convenient maintenance, and is suitable for the continuous crystallization process of Bayer process mother liquor and other high-difficulty materials.

The present application relates to the technical field of crystalline trehalose, and particularly relates to a continuous crystallizer for producing crystalline trehalose and a crystallization method thereof, which comprises the following steps: obtaining the amplitude of ultrasonic reflection wave of an ion exchange resin column; determining the feeding flow of trehalose concentrated solution based on the first conductivity value at the outlet of a liquid collecting cavity; continuously injecting the trehalose concentrated solution into the inlet of the ion exchange resin column according to the feeding flow, and obtaining the second conductivity value at the outlet of the liquid collecting cavity; re-determining the feeding flow of the trehalose concentrated solution according to the second conductivity value; obtaining the microcrystalline content at the outlet of the liquid collecting cavity; determining the crystallization temperature of the corresponding crystallization tank based on the microcrystalline content; crystallizing the desalted trehalose concentrated solution according to the crystallization temperature, and sequentially performing crystal slurry separation, mother liquor recovery and drying on the crystal slurry obtained after crystallization, so as to obtain the finished product of crystalline trehalose. The present application realizes the improvement of the crystallization quality of the finished product of crystalline trehalose.

The invention discloses a three-stage flash continuous crystallization method of nickel and cobalt sulfates, and belongs to the field of inorganic salt preparation. Comprising the following steps: S1, evaporating and concentrating a nickel sulfate or cobaltous sulfate dilute solution to a nearly saturated state; s2, a concentrated solution pump is used for conveying the concentrated solution to a first-stage DTB flash evaporation crystallization tank, high-temperature feed liquid is subjected to primary flash evaporation cooling, controllable supersaturation degree is formed, and crystals are separated out; s3, transferring the material in the primary DTB flash crystallization tank to a secondary DTB flash crystallization tank through a primary transfer pump, carrying out secondary flash evaporation cooling on the material liquid to form a controllable supersaturation degree, and separating out and growing crystals; s4, transferring the material in the second-stage DTB flash crystallization tank to a third-stage OSLO flash crystallization tank by virtue of a second-stage transfer pump, carrying out flash evaporation cooling on the material liquid for three times to form a controllable supersaturation degree, and separating out crystals and continuously growing; and S5, enriching qualified crystals at the bottom of the OSLO crystallizing tank, performing centrifugal separation on crystal mush after thickening, and drying wet crystals at low temperature to obtain the product, thereby solving the problems of fine crystal accumulation and inflexible particle size adjustment.

The application discloses a kind of azoxystrobin continuous crystallization method, belong to pesticide fungicide technical field.It includes the following steps: first crystallizer, second crystallizer, third crystallizer, fourth crystallizer head-to-tail sequentially interconnect, and from top to bottom are set, the crystal slurry in the crystallizer utilizes height difference self-flow discharge;First, the concentration is 25-30% mass concentration of butyl acetate solution containing azoxystrobin is carried out to crystal operation;After the crystal of butyl acetate solution containing azoxystrobin is precipitated, butyl acetate solution containing azoxystrobin is added to first crystallizer, temperature control is at 53-57 ℃ temperature, stays for a certain time;Then the crystal slurry is overflowed or pumped into second crystallizer, third crystallizer, fourth crystallizer in sequence and is cooled and crystallized, the crystal slurry in fourth crystallizer is overflowed or pumped into transfer tank or centrifuge, and the product is obtained after the crystal slurry is post-treated.The particle size uniformity of the crystalline crystal obtained by the continuous crystallization method provided by the application.

The utility model discloses a device for preparing ammonium polyvanadate by continuously crystallizing a sodium vanadate solution. The device comprises a premixing tank, a liquid storage tank, a reaction kettle and a filter press, the premixing tank is provided with a sodium vanadate solution inlet, an ammonium sulfate inlet and a sulfuric acid inlet, an outlet of the premixing tank is communicated with an inlet of the liquid storage tank, an outlet of the liquid storage tank is communicated with an inlet of the reaction kettle, and an outlet of the reaction kettle is communicated with an inlet of the filter press; the reaction kettle is provided with a heating structure and a sulfuric acid inlet. According to the device, the pre-mixing tank is independently arranged, the process in the pre-mixing tank is controlled in the use process, so that no crystal precipitate is generated in the pre-mixed vanadium liquid, and the crystallization process is performed in the reaction kettle through the transition of the liquid storage tank, so that the stability of the ammonium polyvanadate crystallization process can be improved, and the particle size of the ammonium polyvanadate can be increased to reduce the cleaning difficulty; the stability and purity of the ammonium polyvanadate in the crystallization process are improved, and meanwhile the particle size of the ammonium polyvanadate is increased.

The application provides a constant-temperature difference continuous crystallization control method for p-toluenesulfonamide, which comprises the following steps: S1, preliminary cooling, 75 DEG C decoloring liquid is filtered through activated carbon, and then enters a p-amine refining primary cooling kettle and is cooled through circulating water; S2, secondary cooling, the liquid is further cooled to 38 DEG C through circulating water and then enters a p-amine refining secondary pre-cooling kettle; S3, continuous cooling and crystallization, the decoloring liquid after the preliminary cooling and the secondary cooling enters two parallel p-amine refining deep cooling kettles, i.e., a p-amine refining deep cooling kettle one and a p-amine refining deep cooling kettle two, and is centrifuged in the deep cooling kettles through 7 DEG C cold water to 16 DEG C. The application can achieve the constant-temperature crystallization effect, reduce the labor intensity of operators and greatly improve the crystallization efficiency.