258results about "Crystallization regulation/control" patented technology

The invention relates to the technical field of parameter adjustment, and discloses a low-temperature evaporative crystallization machine parameter adjustment method, device and equipment and a storage medium, and the method comprises the steps: collecting M groups of temperature sensor data and N groups of pressure sensor data of a low-temperature evaporative crystallization machine, calculating a first uncertainty representation of temperature parameter measurement and a second uncertainty representation of pressure parameter measurement; performing data fusion to obtain an optimal estimated value of a temperature state and an optimal estimated value of a pressure state; parallel prediction is carried out through the thermodynamic equilibrium model, the crystallization kinetic model and the system response model, and a crystallization process prediction result is obtained; according to the technical scheme of the invention, the interference of the feeding fluctuation, the environmental change and the like can be effectively handled, and the real-time updating of the control strategy and the accurate adjustment of the temperature and pressure parameters can be realized.

The invention relates to the technical field of automatic control, in particular to a monitoring method and system for synthesizing ceramide based on alpha-hydroxy fatty acid, and the monitoring system for synthesizing ceramide based on alpha-hydroxy fatty acid comprises a raw material feeding module, a reaction control module, a quenching-crystallization joint control module and a data integration module; carrying out dynamic weighing monitoring on the raw materials based on the received synthesis instruction, and starting a reaction kettle according to weighing data; performing multi-dimensional data acquisition in real time according to the set reaction data, and performing dynamic feeding control according to the set reaction data; when the TLC detection substrate reaction is completed, the cooling process and the crystallization process are regulated and controlled in real time according to the reaction data until the end point judgment standard is met; according to a received synthesis completion instruction, product quality data is obtained, a monitoring data packet is generated, the synthesis instruction is marked and then stored, process control is accurately monitored and controlled, and the purity and crystal form of the product are ensured.

The invention provides a cooling rate optimization control method and system for continuous cooling crystallization, and the method comprises the steps: collecting crystal slurry concentration data and temperature data of each stage of crystallization tank in real time; the crystal slurry concentration data, the temperature data and the feeding flow data are input into a deep learning model, and a prediction result is obtained; based on the prediction result and crystal mush concentration data, dynamically adjusting the cooling rate of each stage of crystallizing tank and the addition amount of a co-crystallizing solvent; and feeding back an outlet crystal mush concentration signal of the last-stage crystallizing tank to the solid-liquid separation unit, and adjusting the running rotating speed of the solid-liquid separation unit in a linkage manner. According to the cooling rate optimization control method and system for continuous cooling crystallization, prospective correction of the cooling rate is carried out by using the predicted supersaturation degree, and adjustment of the additive amount of the auxiliary crystallization solvent is carried out by using the predicted crystal particle size distribution; and finally, an outlet concentration signal of the last-stage crystallizing tank is fed back to the solid-liquid separation unit in real time to adjust the separation rotating speed in a linkage manner, so that the crystal particle size deviation is reduced, and the triazole crystallization recovery rate is improved.

The invention provides an ultrasonic-assisted gamma-aminobutyric acid crystallization particle size regulation and control method, which comprises the following steps: removing impurities and decolorizing gamma-aminobutyric acid-containing feed liquid, heating, stirring and concentrating to a nearly saturated state, then carrying out ultrasonic-assisted crystallization, cooling, aging and suction filtration to obtain coarse crystals, and finally washing and drying to obtain target crystals. According to the method, a synergistic process of raw material liquid pretreatment, evaporation concentration-ultrasonic-cooling coupling crystallization, aging and post-treatment is adopted, an ultrasonic cavitation effect is utilized to reduce a nucleation barrier, and a supersaturation degree precise control and gradient cooling strategy is combined, so that grain size refinement, obvious narrowing of distribution and effective inhibition of agglomeration of crystals are realized; the median particle size of the crystal can be controlled to be smaller than or equal to 200 microns, the particle size distribution span is smaller than or equal to 1.5, the agglomeration phenomenon is remarkably inhibited, the crystal form is kept stable, the crystal habit is complete and smooth, the crystal product quality and the process efficiency are remarkably improved, and the method has important industrial application value.

The invention belongs to the technical field of energy storage batteries, and particularly relates to a desalting, dehumidifying and cooling integrated thermal management device and method for a marine environment energy storage battery. The device is composed of an energy storage battery module, an air inlet dehumidification and desalination module, an air return reprocessing module, a salt crystallization and separation module, a cold source heat exchanger and a heat source heat exchanger. Wherein the inlet air dehumidification and desalination module cools inlet air by utilizing a first solvent and inlet air cross flow heat exchange mode, meanwhile, the first solvent dissolves salt mist ions in inlet sea wind, and the purposes of reducing the dew point temperature and dehumidifying the inlet sea wind are further achieved; in order to ensure water-salt concentration balance of the first solution, a salt crystallization precipitation module and a return air retreatment module are adopted to jointly adjust the concentration of the first solution. A solution is provided for safe and reliable operation of the energy storage battery system under the ocean high-temperature, high-humidity and high-salt links.

The invention relates to a liquid level control device of a vacuum crystallizer. Relates to the technical field of vacuum crystallization. The device comprises a flash tank arranged below a crystallization pot, the flash tank is provided with an overflow port, and the bottom end of a discharge pipe extends into the flash tank and is lower than the overflow port, so that feed liquid and liquid level in the flash tank automatically flow out of the overflow port when reaching the height of the overflow port. The overflow port is formed in the overflow groove, the bottom end of the discharge pipe extends to the position below the overflow port in the overflow groove, when the liquid level of feed liquid in the overflow groove reaches the height where the overflow port is located, the feed liquid automatically flows out of the overflow port, liquid level control over the feed liquid in the overflow groove is achieved, and therefore the liquid level of the feed liquid in the overflow groove is controlled. The liquid level control device is simple in structure, reliability of liquid level control in the vacuum crystallizer can be improved, and then the effect of liquid level control in the vacuum crystallizer is guaranteed.

The invention provides a production device and process for increasing the content of magnesium citrate crystals. The problems that in the prior art, the impurity co-crystallization rate is high, and crystal forms are difficult to control are solved. The device comprises a gradient temperature control multi-stage crystallization device and a crystal form directional regulation and self-adaptive separation system. The gradient temperature control multi-stage crystallization device is composed of a main crystallizer, a gradient temperature control system, an ultrasonic-assisted system and a liquid phase partition circulating system, and the crystallization environment is accurately controlled through the temperature gradients of five independent temperature zones. The crystal form directional regulation and self-adaptive separation system is composed of a seed crystal dynamic inoculation device, an electric field auxiliary directional crystallization system, a real-time crystal morphology analysis system and a self-adaptive separation system, and the crystal morphology and particle size distribution can be accurately controlled. According to the process disclosed by the invention, the main content of magnesium citrate is increased to 98.8 + / -0.3%, heavy metal impurities and organic impurities are respectively reduced by 70% and 75%, the crystal form consistency is increased to 96 + / -2%, the production period is shortened by 33%, and the process has remarkable economic benefits and social benefits.

The invention relates to the technical field of mixing equipment, and discloses a mixing preparation device and method for a plant growth regulator containing a silicon element. The mixing preparation device of the silicon-containing plant growth regulator comprises a stirring main kettle, an online monitoring unit, a solid-liquid separation unit and a control unit, the stirring main kettle is used for carrying out a liquid-phase chemical reaction and separating out a solid product in situ, and is provided with a stirring piece; and the on-line monitoring unit is used for acquiring a reaction process signal and a crystallization state signal in the main stirring kettle in real time. The online monitoring unit, the solid-liquid separation unit and the control unit are arranged and cooperatively used, dynamic optimization management of the reaction crystallization process is achieved, the solid-liquid separation unit moves out crystals in time and circularly supplements materials, the problem that the crystals are secondarily wrapped is solved, meanwhile, reaction balance is pushed to move rightwards, and the reaction efficiency is improved. The conversion rate and the yield are improved.

The invention relates to the technical field of insecticides, and discloses an indoxacarb finished product crystallization device and method.The indoxacarb finished product crystallization device comprises a supporting bracket, a stirring tank is arranged at the top of the supporting bracket, an opening plate is arranged on one side of the stirring tank, a mounting frame is arranged at the top of the stirring tank, a driving source is arranged on the mounting frame, and a rotating shaft is arranged at the output end of the driving source; a fixing frame is arranged at the bottom of the inner wall of the stirring tank, and a homogenizing assembly is arranged on the fixing frame; the fixing frame is further provided with a vibration assembly. The homogenizing assembly is used for uniformly mixing the indoxacarb finished product solution in the stirring tank; the vibration assembly is used for reducing the phenomenon of local supersaturation of liquid in the stirring tank through vibration. Compared with the prior art, crystal agglomeration can be reduced, the particle distribution uniformity can be improved, the wall surface scaling risk can be reduced, the cleaning and maintenance frequency can be reduced, and the production efficiency and the product quality can be improved.

According to the low-energy-consumption evaporating crystallizer, a single driving motor is adopted, a rotating shaft rod is used for simultaneously driving a scale scraping assembly arranged in an evaporating cylinder to conduct dynamic scale scraping and solution stirring, one end of the rotating shaft rod passes through a first transmission mechanism and a linkage shaft, and the other end of the rotating shaft rod is driven by a second transmission mechanism. A spiral separation assembly in the gas-liquid separation tank is driven by the direction conversion mechanism to rotate at a high speed so as to strengthen gas-liquid separation; and the other end of the discharging pipe drives a discharging assembly in the discharging pipe to rotate through a second transmission mechanism, so that discharging blockage prevention and negative-pressure deslagging are realized. Through a single power source, cooperative linkage of five functions of scale scraping, stirring, separation, blocking prevention and slag discharging is achieved, the structure is compact, the problems that traditional equipment is serious in scaling, poor in gas-liquid separation effect and prone to blockage during discharging are effectively solved, and meanwhile energy consumption of the equipment is remarkably reduced.

The invention discloses a diiodosilane purification method and a purification processing system, relating to the technical field of diiodosilane. A driving component is provided on a mounting shell, an inner liner is clamped on an output end of the driving component, the driving component is slidably connected to a sliding groove provided on the mounting shell, the inner liner is located in a sliding cavity in the mounting shell, the sliding cavity is communicated with the sliding groove, a limiting component is installed on the mounting shell, a notch is provided on the mounting shell, the limiting component is tilted toward the notch, and the crystals can be quickly taken out by taking out the inner liner, thereby enhancing work efficiency, facilitating the rapid removal of the crystals, and enabling the next crystallization to be carried out quickly. Moreover, by arranging a filter screen and a railing on the inner liner, the residual liquid in the inner liner can be quickly discharged, thereby preventing the residual liquid from affecting the purity of the diiodosilane.

The invention relates to the technical field of ammonium dihydrogen phosphate preparation, and discloses a high-purity ammonium dihydrogen phosphate crystallization device and a method thereof.The high-purity ammonium dihydrogen phosphate crystallization device comprises a first-stage crystallization system, a first-stage centrifugal separation system, a second-stage crystallization system and a second-stage centrifugal separation system which are connected in series. The primary crystallization system comprises a crystal elimination heater, a crystal elimination mixer, a bag filter and a DTB flash cooling crystallizer which are connected in sequence, and is used for primarily purifying a concentrated solution; the primary centrifugal separation system is used for separating primary crystals; the second-stage crystallization system comprises a crystal dissolving tank, an OSLO cooling crystallizer and the like, and deep crystallization is carried out after the first-stage crystal is dissolved; the secondary centrifugal separation system is used for separating secondary crystals; through two-stage crystallization coupling, mother liquor graded circulation, a unique gradient washing process and active impurity control, efficient and continuous production of battery-grade ammonium dihydrogen phosphate with wet-process phosphoric acid as a raw material is realized, the product purity is high, the process flow is simplified, the cost is low, and the system operation is stable.

The application provides an amino acid composite reagent system and a method for treating electronic waste to prepare high-purity glycine copper, and belongs to the technical field of metal hydrometallurgy and resource recycling. The application builds an ammonia catalytic reduction mechanism by designing an amino acid composite reagent system, greatly improves the leaching rate, simultaneously inhibits the dual effects of copper hydroxide precipitation and glycine chelation, and realizes efficient solution of copper ions; through narrow window regulation technology of pH at 9.5±0.2, the stability of ammonia, the activity of glycine anion are maintained, and the selective leaching rate of copper is ensured; a directional crystallization process of leaching solution is constructed, the "self-assembly directional crystallization" process of glycine copper chelate is used, based on the saturation concentration of glycine copper in the leaching solution and the stable chelate structure, through three-stage crystallization precise regulation, the preparation of high-purity crystal is realized. The process realizes the closed-loop crystallization system of "zero addition of crystal seeds and zero wastewater discharge" of the copper-containing complex leaching solution of electronic waste.

This application relates to the field of functional crystalline material preparation and microfluidic application technology, specifically disclosing a method and product for preparing formate crystals using core-shell microcapsules, including the following steps: (1) dissolving a solid alkaline raw material in a formic acid solution to prepare reaction solution a; (2) separately conveying polymer solution A and polymer solution B with phase separation characteristics, and reaction solution a, so that they are mixed at the intersection of microchannels to prepare dispersed phase b, which is then introduced into the assembly zone for phase separation assembly to form core-shell microcapsules; (3) the core-shell microcapsules are crystallized in a continuous temperature-changing crystallization zone to form formate solid; (4) the formate solid is collected, washed and dried sequentially to obtain the target product; (5) the oil layer is continuously extracted and returned to the assembly zone for recycling. The formate crystals prepared in this application not only have a large particle size, but also exhibit good size uniformity and morphological repeatability, and have the advantages of high throughput, green environmental protection, and simple operation.

The invention discloses a use method of 2, 4-dihydroxybenzoic acid dissolving and recrystallizing equipment, the 2, 4-dihydroxybenzoic acid dissolving and recrystallizing equipment comprises a closed dissolving kettle, a crystallization kettle and a mother liquor storage tank, the closed dissolving kettle, a first separator, a first filtrate storage tank and the crystallization kettle are connected in sequence, and the mother liquor storage tank is connected with a second separator. A discharge port of the crystallization kettle is connected with a feed port of a second separator, a filtrate discharge port of the second separator is connected with a liquid inlet of a second filtrate storage tank, and a liquid outlet of the second filtrate storage tank is communicated with a liquid inlet of the mother liquid storage tank through a third pipeline; the second pipeline between the first separation column and the second pump body is communicated with a liquid outlet of the mother liquid storage tank through a fourth pipeline; the second pipeline between the second pump body and the fourth pipeline is communicated with one end of a backflow pipeline, and the other end of the backflow pipeline is communicated with the first pipeline. The 2, 4-dihydroxy benzoic acid dissolving and recrystallizing equipment disclosed by the invention can be used for preparing 2, 4-dihydroxy benzoic acid with the purity of 99.68%, and the content of metal ions is reduced to 0.15 ppm.

Method for producing electronic grade nickel sulfate from nickel powder, crystallization apparatus, and control thereof The present invention provides a method for producing nickel sulfate, and nickel sulfate produced thereby. The process includes acid leaching, copper removal, acid adjustment, concentration, cooling crystallization, drying and sieving, and secondary leaching. Oxidation In the calcination furnace, the temperature is 400 to 700°C, and 1 kg of compressed air is used for each kilogram of nickel powder. ~5m 3 The reaction time is 1.0 to 2.5 hours, and the temperature during acid immersion is controlled to 45 to 70°C. Then, add dilute sulfuric acid to control the pH to 0.5-1.5 and react for 1-3 hours. The copper removal is to replace the copper with nickel powder, and the acid conditioning is to use nickel hydroxide or The pH is adjusted to 2.5-4.5 using nickel carbonate, and the filtrate is concentrated by The cooling crystallization method is to obtain nickel sulfate crystals and return the mother liquor to the concentrate. Drying and sieving is to add the undersieved material to the crystallizer as seed crystals, and secondary leaching is to Dilute sulfuric acid is added to the leaching slag, and it is reacted with nickel sulfate or hydrogen peroxide until nickel is less than 0.1%. If the first stage is full, the second leaching is continued. The crystallizer is a crystallizer that is connected in series with a second-stage crystallizer and a third-stage crystallizer. A crystallization frame, an oscillator provided under the crystallization frame, and an oscillator provided at the exit end of the crystallization frame. The crystallization frame is a rectangular parallelepiped. The bottom of the ribs are evenly spaced, with a cross section of a circular arc. The distance between two adjacent ribs is S is 1 / 25 to 1 / 15 of the width of the crystallization frame, and either the width b or the height h of the rib The width of the crystallization frame is 1 / 100 to 1 / 150 of the width of the crystallization frame. It does not add any new impurity ions, and does not add any oxidizing agent. The nickel sulfate crystal particles produced are uniform and are free of the static generation. This avoids caking of very large particles, irregularly shaped particles and crystals.

The present disclosure provides a preparation system and a preparation method for xylitol crystals. In the preparation system, outlets of a first centrifuge are connected with an inlet of a hot air drying tank and an inlet of a primary mother liquor storage tank through pipelines, respectively. Outlets of a second centrifuge are connected with an inlet of a second fluidized bed dryer and an inlet of a secondary mother liquor storage tank through pipelines, respectively. An outlet of a dicrystalline sugar dissolution tank is connected with an inlet of a blending tank through a pipeline. An outlet of a tricrystalline sugar dissolution tank is connected with the inlet of the primary mother liquor storage tank. The blending tank is provided with an inlet for a raw material of xylitol hydrogenation solution. An output of an outlet of a first fluidized bed dryer is prepared xylitol crystals.

The invention provides a cooling crystal obtaining system for generating a chelated fertilizer, and relates to the technical field of mixed fertilizer manufacturing, the cooling crystal obtaining system comprises a crystallization bin, the middle of the bottom of the crystallization bin is connected with a circulating pipeline, and the front side of the lower end of the circulating pipeline is connected with a discharge pipeline; a chelating bin is fixedly arranged at the top of the crystallizing bin, a top cover is fixedly arranged at the top of the chelating bin, and a feeding pipe is fixedly connected to the front upper part of the top cover; six groups of expansion grooves are integrally arranged below the outside of the chelating bin, and semiconductor refrigeration plates are fixedly arranged outside the expansion grooves; in the system, the chelating bin and the crystallizing bin continuously convey liquid materials through the air pressure and communicating vessel principle, circulating backflow retreatment of the uncrystallized liquid materials is achieved through the circulating device, the flow direction of the liquid materials is accurately regulated and controlled in cooperation with the electric cylinder A and the electric cylinder B, and the whole process of raw material supplementation, crystal generation and crystal separation can be completed without shutdown; the problems that traditional evaporative crystallization is low in efficiency and continuous operation cannot be achieved are solved, and the yield of chelated fertilizer crystals in unit time is remarkably increased.

The application discloses a kind of phosphoric acid extraction semi-water-two water alternate crystallization system and method, belong to the technical field of wet-process phosphoric acid production, the system is by the reaction tank unit of series connection and semi-water and two water reaction tank alternate arrangement, with the sulfuric acid dilution mixed heat exchanger group connected with reaction tank, simple heat exchanger group is arranged between tank to realize heat transfer.Construction.The method includes: material is temperature-adjusted after passing through sulfuric acid dilution mixed heat exchanger, in turn into the reaction tank sequence of alternate arrangement, heat circulation is carried out in adjacent tank by simple heat exchanger, under the control of PLC in 75~85 DEG C and 88~95 DEG C interval, realize the alternate crystallization of semi-water-two water calcium sulfate.The application replaces traditional flash evaporation external discharge with heat internal circulation between tank, solves the technical problems of high steam energy consumption, low phosphorus recovery rate, insufficient phosphoric acid concentration and high upgrading cost of stock device in traditional process, and has the comprehensive advantages of energy saving, yield, low-cost transformation and phosphogypsum resource.

The invention provides an amino acid composite reagent system and a method for preparing high-purity copper glycinate by treating electronic waste through the amino acid composite reagent system, and belongs to the technical field of metal hydrometallurgy and resource regeneration. According to the method, an amino acid composite agent system is designed, an ammonia catalysis barrier reduction mechanism is constructed, the leaching rate is greatly increased, the double effects of copper hydroxide precipitation and glycine chelation are synchronously inhibited, and efficient dissolution of copper ions is achieved; the ammonia stability and the glycine anion activity are maintained through a narrow window regulation and control technology with the pH value being 9.5 + / -0.2, and the copper selective leaching rate is guaranteed; the method comprises the following steps: constructing a leaching solution directional crystallization process, and preparing a high-purity crystal by utilizing a self-assembly directional crystallization process of a copper glycinate chelate based on the saturation concentration of copper glycinate in the leaching solution and a stable chelation structure through precise regulation and control of three-stage crystallization. According to the process, a closed-loop crystallization system of'zero seed crystal addition and zero wastewater discharge 'of the copper-containing complex leaching solution of the electronic waste is realized.

In the crystallization system of the lithium hexafluorophosphate of the present invention, a first-stage crystallization kettle is connected to a lithium hexafluorophosphate mother liquor supply source through a lithium hexafluorophosphate mother liquor supply line; further connected to the lithium hexafluorophosphate mother liquor supply source through a mother liquor heat exchange line connected with a mother liquor heat exchanger; and further connected to a second-stage crystallization kettle through a first mother liquor delivery line configured to deliver lithium hexafluorophosphate mother liquor, a second-stage crystallization kettle is connected to a third-stage crystallization kettle through a second mother liquor delivery line configured to deliver lithium hexafluorophosphate mother liquor, a third-stage crystallization kettle is connected to a fourth-stage crystallization kettle through a crystalline particle delivery line configured to deliver small crystalline particles in the third-stage crystallization kettle; and further connected to a next process device through a first discharging line, and a fourth-stage crystallization kettle is connected to a next process device through a second discharging line. The crystallization system of lithium hexafluorophosphate of the present invention enables different crystallization stages to be carried out separately in different crystallization kettles, so as to realize continuous feeding and continuous discharging in the course of crystallization.

The invention relates to a eutectic freeze crystallization apparatus of liquid, comprising: a eutectic freeze crystallization chamber (200) comprising an internal space having a first portion and a second portion and configured to receive said liquid via a feeding inlet arranged within the eutectic freeze crystallization chamber; mixing means arranged within the internal space at the first portion and configured to mix the liquid therein; a cooling element configured to cool the liquid within the internal space for lowering temperature of the liquid such that ice and salt crystals will be formed within the liquid; and conveyor means extending at least within the internal space and configured to convey at least part of the ice and salt crystals from the liquid towards a first outlet arranged at the second portion and to feed out via the first outlet the at least part of the ice and salt crystals from the internal space of the eutectic freeze crystallization chamber. The ice and salt crystals are separated in a separation unit (333).

The invention relates to the technical field of metal alkoxide preparation, and particularly provides a method for rapidly solidifying aluminum isopropoxide, which comprises the following steps: concentrating liquid aluminum isopropoxide in vacuum at 80-90 DEG C until the concentration is greater than or equal to 95%; sequentially adding 0.1 to 0.2 percent of a crystallization assisting solvent TXIB, 0.05 to 0.1 percent of a nanoscale aluminum isopropoxide seed crystal and 0.01 to 0.1 percent of a magnesium isopropoxide eutectic seed crystal; crystallization is completed through gradient cooling, and the whole process is less than or equal to 24 hours; and finally, carrying out solid-liquid separation, washing and drying to obtain the high-purity aluminum isopropoxide crystal. Through the synergistic effect of the bifunctional seed crystal and the TXIB, the crystallization period is remarkably shortened, the crystal quality is improved, and the method is suitable for industrial production.

The invention discloses a system for preparing large-particle cobalt chloride hexahydrate through ultralow-temperature evaporative crystallization, which comprises a stock solution tank, a forced circulation pump, a forced heat exchanger, an ultralow-temperature crystallizer and a vacuum unit, the stock solution tank is connected with the forced circulation pump through a preheating unit, the forced circulation pump is located between the forced heat exchanger and the ultralow-temperature crystallizer, and the vacuum unit is connected with the forced heat exchanger. The forced circulation pump is used for circularly conveying a cobalt chloride solution to enter the forced heat exchanger to be heated and then enter the ultralow-temperature crystallizer to be subjected to flash evaporation, the ultralow-temperature crystallizer is connected with a centrifugal machine, and a gas treatment unit is arranged between the ultralow-temperature crystallizer and the forced heat exchanger; the gas treatment unit is used for treating secondary steam generated by flash evaporation and then supplying the treated secondary steam to the forced heat exchanger, and the vacuum unit is connected with the forced heat exchanger and used for maintaining a low-temperature environment for the ultralow-temperature crystallizer; no matched cooling crystallization equipment is needed, crystallization is directly completed through an ultralow-temperature evaporation and crystallization integrated process, the technological process is shortened, and the equipment investment and the occupied area are reduced.

The present application relates to a kind of device and method for extracting high-purity chemicals from coal tar wash oil fraction, comprising: naphthalene separation column, methylnaphthalene separation unit, acenaphthene-fluorene-dibenzofuran separation unit;Methylnaphthalene separation unit includes methylnaphthalene separation tower, β-methylnaphthalene subunit and α-methylnaphthalene subunit connected in sequence;Acenaphthene-fluorene-dibenzofuran separation unit includes light removal tower, acenaphthene subunit, dibenzofuran subunit and fluorene subunit connected in sequence;The material outlet of the bottom of naphthalene separation column is connected with methylnaphthalene separation tower;The material outlet of the bottom of methylnaphthalene separation tower is connected with the material inlet of light removal tower.The device provided by the present application can effectively extract target chemicals in coal tar wash oil fraction by reasonable configuration of the device and coupling cooperation between devices, and obtain high-purity products.Compared with existing wash oil extraction chemical technology, it has higher efficiency, wider applicability and better product quality.

The application discloses a preparation method of high-purity trans-4-propionylcyclohexylbenzene, and belongs to the technical field of liquid crystal material preparation. The method is based on dynamic synergy of three-stage gradient temperature control, seed addition in batches and intermittent stirring, and in a single petroleum ether solvent system, crystal growth is induced through ultralow-temperature cyclic crystallization and precise temperature control; in combination with a matching filter-drying integrated machine, continuous operation of low-temperature solid-liquid separation and vacuum drying is realized. The application significantly improves the purity and yield stability of the product, and one-time high-purity crystals are obtained, overcoming the problems of incomplete impurity separation, high energy consumption and large batch fluctuation in the traditional process, and simultaneously adapting to the industrial production demand, and providing a green and efficient high-purity preparation path for liquid crystal intermediates.

The invention relates to the technical field of salt preparation systems, in particular to a sodium chloride and sodium sulfate large-particle salt preparation system, which comprises a crystallization separation module, a sodium chloride and sodium sulfate large-particle salt preparation module and a sodium chloride and sodium sulfate large-particle salt preparation module, the fine crystal elimination and crystallization module comprises a crystal grading and growing kettle, a thickener and a centrifugal machine, a solution is evaporated and crystallized through the crystal separation module and conveyed to the fine crystal elimination and crystallization module, and the fine crystal elimination and crystallization module carries out grading and growing on the solution and forms crystals with different particle sizes; and the floating fine crystal is conveyed to the fine crystal eliminating and dissolving module again to carry out fine crystal dissolving on the unsaturated solution, the dissolved solution is conveyed to the fine crystal eliminating and crystallizing module again, and after the sinking particle crystal is thickened, centrifugal dewatering is carried out to form a crystal with a large crystal form particle size and a large crystal form particle size. And the crystal is round and regular in morphology, so that the crystal is good in flowability, anti-caking, high in strength and not easy to break, and industrial subsequent treatment is greatly reduced.

The invention provides a novel production method of pentaerythritol, which relates to the technical field of chemical products, and comprises the following steps: proportioning formaldehyde, acetaldehyde and lithium hydroxide, mixing, carrying out condensation reaction, and adding formic acid to neutralize the solution after the reaction; collecting the neutralized solution, carrying out rectification treatment, and separating out crystals; carrying out centrifugal treatment on the separated crystals, and then putting the crystals into a washing tank for washing; drying to obtain a pentaerythritol finished product; precipitating the mother liquor, washing and refluxing the filtered solution, and mixing the filtered solution with the dealdehyding solution for cyclic utilization; and concentrating, crystallizing, centrifuging, washing and drying the filtrate to obtain a lithium formate product. According to the production method of the pentaerythritol by the lithium method, the reaction conversion rate is high, and the product quality is excellent; the added value is high, and the overall economy of the production process is good; the mother liquor is completely circulated in a closed manner, and is pollution-free and environment-friendly. The automation degree is high, and the washing, overturning and discharging processes can be completed only through single power equipment.

This invention discloses an ultrasonic-cold finger coupled plate melt crystallizer and a continuous purification process. The crystallizer body includes multiple heat exchange plates, each with a built-in serpentine refrigerant channel; multiple ultrasonic vibrating plates are sequentially arranged around the shell of the plate melt crystallizer to provide an ultrasonic field covering the entire crystallizer body; at least one cold finger assembly is located on top of the plate melt crystallizer and connected to the upper cover plate of the crystallizer body via a detachable flange. The cold finger assembly includes an inlet manifold, an outlet manifold, a cold finger body, and an ultrasonic probe. The inlet and outlet manifolds are arranged parallel to each other above the crystallizer body along a second direction. The bottom of each cold finger body is located within the crystallizer body, and its top two ends are connected to the inlet and outlet manifolds, respectively. The ultrasonic probe extends along a third direction and is inserted into the interior of the cold finger body. Using the melt crystallizer and process of this invention enables higher crystallization efficiency and greater product yield.