Crystallization device for producing sarcosinate sodium

Abstract

The application discloses a crystallization device for producing creatine sodium, and relates to the technical field of crystallization devices.The device is used for solving the problems that, when supersaturated liquid droplets contact the wall of a low-temperature gas-liquid separator, water evaporation is intensified, the temperature reduction further reduces the solubility of solutes, the double effects accelerate the precipitation of crystals, the crystals are easily attached to the tank wall during the crystallization process, the tank wall is scaled, the heat exchange efficiency is affected, the wall-attached crystals cannot be recovered, and the yield is reduced.The evaporator is installed on one side of the gas-liquid separator, the cyclone separator is installed on the other side of the gas-liquid separator, the ultrasonic disperser is installed on one side of the cyclone separator, the membrane filter is installed on one side of the ultrasonic disperser, the gas-liquid separator cleaning mechanism is installed in the gas-liquid separator, the gas-liquid separator scraping frame is installed at one end of the gas-liquid separator cleaning mechanism, and the membrane filter cleaning mechanism is installed in the membrane filter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crystallization device, and particularly relates to a crystallization device for production of creatine sodium. BACKGROUND

[0002] The crystallization unit for sodium sarcosinate production is the core hub and the key to value enhancement in the entire synthesis process. Its fundamental value lies in successfully transforming the primary sodium sarcosinate product, dissolved in solution and generated from upstream chemical reactions, into a stable, high-purity solid crystalline product that meets specific application requirements through a precisely controlled physical phase transition process. This achieves a crucial leap from a basic chemical substance to a high-value-added commodity. The creation and application of this unit bring significant benefits in multiple dimensions, primarily its decisive influence on the final product quality. The crystallization process is essentially a highly efficient purification and refining stage. This process, by controlling the slow and orderly growth of crystals, effectively rejects and eliminates residual impurity ions, unreacted raw materials, or byproducts in the solution, allowing them to remain more in the mother liquor. This results in sodium sarcosinate crystals achieving unprecedented levels of purity, whiteness, and physicochemical properties, meeting the stringent quality control requirements of high-end daily chemical, pharmaceutical, and food industries. Secondly, this device is a key contributor to improving the economic efficiency and operational efficiency of the entire production process. A well-designed crystallization system can significantly improve the single-batch yield and crystallization rate by optimizing crystallization kinetics and thermodynamic parameters. This means that more qualified products can be obtained from the same volume of reaction liquid, greatly reducing material consumption and unit production costs. Simultaneously, its stable and reliable continuous or batch operation capabilities pave the way for the automation and large-scale production of modern chemical engineering, reducing stagnation and waiting between production stages and ensuring smooth and efficient production processes. Furthermore, the crystallization unit plays an irreplaceable role in ensuring product performance consistency. Specific application areas require sodium sarcosinate products to have consistent crystal morphology, uniform particle size distribution, and good flowability. These characteristics directly affect the ease of handling, dissolution rate, and even the final product efficacy for downstream customers. The crystallization unit, by precisely controlling core variables such as temperature, concentration, and stirring rate, can program the crystal nucleation and growth process, thereby producing standardized products with repeatable physical properties in large quantities, giving sodium sarcosinate excellent market applicability and competitiveness. Finally, the unit also embodies the concepts of modern green chemistry and sustainable development. Its closed design minimizes material leakage and volatile solvent emissions, while its efficient production process itself means intensive energy use, indirectly reducing the environmental footprint of production activities. In conclusion, the crystallization unit for sodium sarcosinate production is far more than just a simple solid-liquid separation pretreatment device. It is a forger of quality, an enhancer of efficiency, and an amplifier of value. It is an indispensable bridge connecting chemical synthesis and commercial applications. Its technological advancements continuously drive sodium sarcosinate and its downstream industries toward a higher quality, higher efficiency, and more sustainable future.

[0003] The prior art in the above has the following defects: the gas-liquid separator maintains a vacuum environment consistent with the evaporator, and the liquid droplets enter due to low pressure and large surface area, and the moisture evaporates instantly and quickly, causing the solute concentration to far exceed the solubility at the current temperature in a very short time, forming super-saturated droplets. When the super-saturated droplets contact the low-temperature wall surface, not only does the water evaporation intensify, but the temperature drop further reduces the solubility of the solute, accelerating the crystallization under the double effects. The crystals are easily attached to the tank wall during the crystallization process, causing fouling of the tank wall and affecting the heat exchange efficiency. The wall-adhered crystals cannot be recovered, the yield is reduced, manual cleaning requires disassembly of the tank cover, and the cleaning process is time-consuming and prone to residual cleaning liquid. Therefore, the present application provides a crystallization device for sodium sarcosinate production to solve the above problems. SUMMARY

[0004] The present application aims to provide a crystallization device for sodium sarcosinate production to solve the problem of super-saturated droplets contacting the low-temperature wall surface of the gas-liquid separator, not only intensifying water evaporation, but also further reducing the solubility of the solute, accelerating the crystallization under the double effects, and easily adhering to the tank wall during the crystallization process, causing fouling of the tank wall and affecting the heat exchange efficiency. The wall-adhered crystals cannot be recovered, the yield is reduced, manual cleaning requires disassembly of the tank cover, and the cleaning process is time-consuming and prone to residual cleaning liquid.

[0005] To achieve the above object, the present application provides the following technical solution: a crystallization device for sodium sarcosinate production, comprising a gas-liquid separator, one side of the gas-liquid separator is provided with an evaporator, the other side of the gas-liquid separator is provided with a cyclone separator, one side of the cyclone separator is provided with an ultrasonic disperser, one side of the ultrasonic disperser is provided with a membrane filter, one side of the membrane filter is provided with a circulating pump, one side of the lower end of the gas-liquid separator is connected to the liquid inlet end of the cyclone separator through a circulating pipe, the liquid outlet end of the cyclone separator is connected to the liquid inlet end of the ultrasonic disperser through an ultrasonic disperser liquid inlet pipe, the liquid outlet end of the ultrasonic disperser is connected to the liquid inlet end of the membrane filter through a membrane filter feed pipe, and the liquid outlet end of the membrane filter is connected to the liquid inlet end of the circulating pump through a membrane filter discharge pipe. A gas-liquid separator cleaning mechanism is installed inside the gas-liquid separator, one end of the gas-liquid separator cleaning mechanism is provided with a gas-liquid separator scraping frame, and a rubber scraping strip is installed inside the gas-liquid separator scraping frame. A membrane filter cleaning mechanism is installed inside the membrane filter.

[0006] Preferably, the liquid outlet end of the circulating pump is connected to the liquid inlet end of the evaporator through an evaporator liquid inlet pipe, one side of the gas-liquid separator is provided with a steam compressor, the gas outlet end of the steam compressor is connected to the gas inlet end of the evaporator, and the output end of the evaporator is provided with a gas-liquid separator feed pipe, one end of the gas-liquid separator feed pipe extends into the gas-liquid separator and is fixedly provided with a feed hopper.

[0007] Preferably, the lower end of the gas-liquid separator is sealingly installed with a crystallization discharge pipe, one side of the membrane filter is installed with a centrifugal device, the other end of the crystallization discharge pipe is sealingly connected with the centrifugal device, one side of the lower end of the preheater is sealingly connected with the liquid outlet end of the centrifugal device through a circulating liquid feeding pipe, one side of the upper end of the preheater is sealingly installed with a preheating liquid feeding pipe, the lower end of the membrane filter discharge pipe is sealingly connected with the preheating liquid feeding pipe, a liquid supplementing valve is installed at the middle position of the circulating liquid feeding pipe, the other side of the liquid supplementing valve is sealingly connected with a liquid supplementing pipe, and the liquid outlet end of the evaporator is sealingly connected with the other side of the lower end of the circulating pump through a heat exchange pipe.

[0008] Preferably, the upper end of the membrane filter is installed with a membrane filter cleaning mechanism motor, the inside of the membrane filter is fixedly installed with a membrane filter filter cylinder, the other side of the upper end of the membrane filter is sealingly installed with a membrane filter pressure relief valve, and the upper end of the membrane filter cleaning mechanism is installed with a membrane filter cleaning mechanism connecting cylinder.

[0009] Preferably, the output end of the membrane filter cleaning mechanism motor extends to the inside of the membrane filter and is drivingly connected with the membrane filter cleaning mechanism connecting cylinder, the outer end of the membrane filter cleaning mechanism is provided with a membrane filter outer scraper, the inner end of the membrane filter cleaning mechanism is provided with a membrane filter inner scraper, the outer end of the membrane filter outer scraper is in abutment with the inner wall of the membrane filter, the inner end of the membrane filter inner scraper is in abutment with the membrane filter filter cylinder, and the membrane filter outer scraper and the membrane filter inner scraper are fixedly connected through a scraper connecting rod.

[0010] Preferably, the lower end of the circulating pipe is sealingly installed with a backwashing second valve, the other end of the backwashing second valve is sealingly connected with a backwashing liquid outlet pipe, a backwashing first valve is sealingly installed at the middle position of the ultrasonic wave disperser liquid inlet pipe, the upper end of the backwashing first valve is sealingly connected with a backwashing liquid inlet pipe, the upper end inside the hydrocyclone separator is obliquely provided with a hydrocyclone separator partition plate, a hydrocyclone reversing pipe is sealingly installed at the middle position below the hydrocyclone separator partition plate, a hydrocyclone groove is arranged between the outer portion of the hydrocyclone reversing pipe and the inner wall of the hydrocyclone separator, and a hydrocyclone separator threaded baffle is fixedly installed at the outer end of the hydrocyclone reversing pipe.

[0011] Preferably, the lower part of the cyclone separator is fixedly provided with a liquid distribution plate, the outer end of the cyclone reversing pipe is annularly provided with a plurality of ultrasonic transducers, the lower part of the liquid distribution plate is equidistantly provided with a plurality of ultrasonic transducers, the lower end of the cyclone reversing pipe is internally provided with a pressurized fan, the inner wall of the cyclone reversing pipe is symmetrically provided with an upwardly inclined first baffle, the middle position of the inner wall of the cyclone reversing pipe is fixedly provided with a second baffle, the two sides of the second baffle are downwardly inclined and the inclination angle is the same as that of the first baffle, and the first baffle and the second baffle are arranged at intervals.

[0012] Preferably, the upper end of the gas-liquid separator is internally provided with a filter screen, the upper part of the middle position of the filter screen is provided with a gas-liquid separator cleaning mechanism motor, the middle position of the gas-liquid separator cleaning mechanism is provided with a gas-liquid separator cleaning mechanism drive shaft, the gas-liquid separator cleaning mechanism drive shaft is in transmission connection with the output end of the gas-liquid separator cleaning mechanism motor, the outer part of the gas-liquid separator cleaning mechanism drive shaft is fixedly provided with a fixed rod, and one side of the fixed rod is fixedly connected with a gas-liquid separator scraping frame.

[0013] Preferably, the other end of the gas-liquid separator cleaning mechanism is provided with a cleaning spray frame, the other side of the fixed rod is fixedly connected with the cleaning spray frame, the front end of the cleaning spray frame is provided with a cleaning sliding guide rail track, and the outer part of the cleaning sliding guide rail track is slidably provided with three cleaning sliding guide rail sliding blocks.

[0014] Preferably, the cleaning sliding guide rail sliding blocks are provided with downwardly inclined cleaning nozzles at the middle positions of the sides close to the inner wall of the gas-liquid separator, the adjacent cleaning sliding guide rail sliding blocks are rotationally connected through connecting shafts, water distribution pipes are arranged between the sides of the adjacent cleaning sliding guide rail sliding blocks, the water distribution pipes are in sealed connection with the cleaning nozzles, one side of the upper end of the gas-liquid separator is provided with a telescopic total water inlet pipe, and the lower end of the total water inlet pipe is in sealed connection with the upper cleaning nozzles.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The present application combines multi-stage fine crystal interception through a cyclone separator, an ultrasonic disperser and a membrane filter, the cyclone separator can intercept fine crystals greater than or equal to 15 microns and return them to the crystallization tank, the ultrasonic disperser can periodically start to disperse fine crystals less than 15 microns, and the membrane filter can further intercept fine crystals of 8-15 microns, thereby allowing only trace fine crystals less than 8 microns to re-enter the evaporator for circulation, thereby fundamentally solving the problem of purity reduction caused by fine crystal accumulation in the mother liquor circulation; at the same time, the concentration of fine crystals is significantly reduced after multiple circulations of the mother liquor, thereby reducing the interference of fine crystals on the crystallization process, improving the purity of sodium sarcosinate crystals, and accelerating the crystallization rate to ensure production efficiency.

[0017] 2. The application avoids filter core blockage and prolongs the service life of core components: the ultrasonic disperser is started at a fixed period to prevent fine crystalline adhesion from blocking the filter core of the membrane filter by high-frequency vibration; the membrane filter cleaning mechanism can remove the crystalline adhesion on the inner wall of the filter and the outer surface of the filter cylinder by synchronous rotation of the inner and outer scrapers, which can double-protect the filter core from blockage failure, reduce the frequency of filter core replacement, prolong the service life of the membrane filter and other core components, and reduce equipment maintenance costs. The system can run continuously and stably, and the downtime for maintenance is reduced: the gas-liquid separator is equipped with a double cleaning mechanism of "scraping and cleaning + nozzle washing", the rubber scraper is attached to the inner wall to remove crystalline adhesion, and the slidable cleaning nozzle realizes omnidirectional washing to avoid crystalline adhesion affecting the separation effect; the cyclone separator is cleaned by combining backwashing with ultrasonic cavitation effect, and the energy generated by the collapse of cavitation bubbles is used to remove impurities on the inner wall, so that cleaning can be completed without disassembly; the targeted cleaning design of each component effectively prevents internal blockage and adhesion of the equipment, ensures continuous and stable operation of the system, and reduces downtime for maintenance caused by faults. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the application;

[0019] Figure 2 is a structural schematic diagram of the membrane filter in the application;

[0020] Figure 3 is a structural schematic diagram of the cyclone separator in the application;

[0021] Figure 4 is a structural schematic diagram of the gas-liquid separator in the application;

[0022] Figure 5 is a local enlarged view of the A area in the application. Figure 4

[0023] ​Figure: 1, gas-liquid separator; 2, evaporator; 3, vapor compressor; 4, cyclone separator; 5, ultrasonic disperser; 6, membrane filter; 7, centrifugal device; 8, circulating pump; 9, steam outlet pipe; 10, evaporator inlet pipe; 11, gas-liquid separator feed pipe; 12, circulating pipe; 13, crystallization outlet pipe; 14, backwash outlet pipe; 15, backwash second valve; 16, backwash inlet pipe; 17, backwash first valve; 18, membrane filter feed pipe; 19, membrane filter outlet pipe; 20, circulating liquid addition pipe; 21, liquid supplement valve; 22, liquid supplement pipe; 23, total liquid supplement pipe; 24, preheating liquid addition pipe; 25, evaporator liquid inlet pipe; 26, heat exchange pipe; 27, membrane filter cleaning mechanism motor; 28, membrane filter pressure relief valve; 29, membrane filter filter cartridge; 30, membrane filter cleaning mechanism; 31, membrane filter outer scraper; 32, membrane filter inner scraper; 33, membrane filter cleaning mechanism connecting cartridge; 34, scraper connecting rod; 35, cyclone separator partition plate; 36, cyclone reversing pipe; 37, cyclone tank; 38, cyclone separator threaded baffle; 39, ultrasonic transducer; 40, liquid separation plate; 41, pressurized air blower; 42, first baffle; 43, second baffle; 44, gas-liquid separator cleaning mechanism; 45, feed hopper; 46, filter screen; 47, gas-liquid separator cleaning mechanism motor; 48, gas-liquid separator cleaning mechanism drive shaft; 49, fixed rod; 50, gas-liquid separator scraper frame; 51, rubber scraper strip; 52, cleaning spray frame; 53, cleaning sliding guide sliding block; 54, cleaning sliding guide rail; 55, total water inlet pipe; 56, cleaning nozzle; 57, water distribution pipe; 58, connecting rotating shaft; 59, preheater. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0025] Please refer to Figures 1-5The application provides a crystallization device for producing sarcosine sodium, which comprises a gas-liquid separator 1, an evaporator 2 is arranged on one side of the gas-liquid separator 1, a cyclone separator 4 is arranged on the other side of the gas-liquid separator 1, an ultrasonic disperser 5 is arranged on one side of the cyclone separator 4, a membrane filter 6 is arranged on one side of the ultrasonic disperser 5, a circulating pump 8 is arranged on one side of the membrane filter 6, one side of the lower end of the gas-liquid separator 1 is connected to the liquid inlet end of the cyclone separator 4 through a circulating pipe 12, the liquid outlet end of the cyclone separator 4 is connected to the liquid inlet end of the ultrasonic disperser 5 through an ultrasonic disperser liquid inlet pipe, the liquid outlet end of the ultrasonic disperser 5 is connected to the liquid inlet end of the membrane filter 6 through a membrane filter feed pipe 18, the liquid outlet end of the membrane filter 6 is connected to the liquid inlet end of the circulating pump 8 through a membrane filter discharge pipe 19, a gas-liquid separator cleaning mechanism 44 is arranged in the gas-liquid separator 1, one end of the gas-liquid separator cleaning mechanism 44 is provided with a gas-liquid separator scraping frame 50, and a rubber scraping strip 51 is arranged in the gas-liquid separator scraping frame 50; and a membrane filter cleaning mechanism 30 is arranged in the membrane filter 6.

[0026] The gas-liquid separator cleaning mechanism 44, the gas-liquid separator scraping frame 50, the rubber scraping strip 51 in the gas-liquid separator 1 and the membrane filter cleaning mechanism 30 in the membrane filter 6 have the advantages that a continuous closed-loop treatment process of sarcosine sodium crystallization is constructed, stable transmission of materials between the core components is realized, the gas-liquid separator cleaning mechanism 44 removes the crystals by adhering to the inner wall through the rubber scraping strip 51, the membrane filter cleaning mechanism 30 prevents the crystallization from being blocked in advance, the influence of the crystal adhesion on the inner wall of each component on the material transmission and separation effect is effectively reduced, and the stability and smoothness of the basic operation of the device are ensured.

[0027] Please refer to Figure 1 the liquid outlet end of the circulating pump 8 is connected to the liquid inlet end of the evaporator 2 through an evaporator liquid inlet pipe 25, a steam compressor 3 is arranged on one side of the gas-liquid separator 1, the gas outlet end of the steam compressor 3 is connected to the gas inlet end of the evaporator 2, the output end of the evaporator 2 is provided with a gas-liquid separator feed pipe 11, one end of the gas-liquid separator feed pipe 11 extends into the gas-liquid separator 1 and is fixedly provided with a feed hopper 45, the lower end of the gas-liquid separator 1 is provided with a crystallization discharge pipe 13, a centrifugal device 7 is arranged on one side of the membrane filter 6, the other end of the crystallization discharge pipe 13 is connected to the centrifugal device 7, a preheater 59 is arranged on one side of the circulating pump 8, the liquid outlet end of the centrifugal device 7 is connected to one side of the lower end of the preheater 59 through a circulating liquid feeding pipe 20, one side of the upper end of the preheater 59 is provided with a preheating liquid feeding pipe 24, the preheating liquid feeding pipe 24 is connected to the lower end of the membrane filter discharge pipe 19, a liquid supplementing valve 21 is arranged at the middle position of the circulating liquid feeding pipe 20, the other side of the liquid supplementing valve 21 is connected to a liquid supplementing pipe 22, and the liquid outlet end of the evaporator 2 is connected to the other side of the lower end of the circulating pump 8 through a heat exchange pipe 26.

[0028] The secondary steam generated by the evaporator 2 is recycled by the steam compressor 3, and the heat energy is transferred between the evaporator 2 and the circulating pump 8 through the heat exchange pipe 26. The preheater 59 preheats the mother liquor discharged from the centrifugal device 7 and returns it to the system, which greatly improves the heat energy utilization rate and reduces energy waste. The feed hopper 45 ensures that the material enters the gas-liquid separator 1 smoothly, the liquid supplement valve 21 and the liquid supplement pipe 22 can flexibly supplement the material, and the mother liquor separated by the centrifugal device 7 is recycled and reused, which not only reduces material loss but also ensures continuous and stable production of the device.

[0029] Please refer to Figures 1-4 The upper end of the membrane filter 6 is provided with a membrane filter cleaning mechanism motor 27, the inside of the membrane filter 6 is fixedly provided with a membrane filter filter cylinder 29, the other side of the upper end of the membrane filter 6 is sealingly provided with a membrane filter pressure relief valve 28, and the upper end of the membrane filter cleaning mechanism 30 is provided with a membrane filter cleaning mechanism connecting cylinder 33. The output end of the membrane filter cleaning mechanism motor 27 extends into the inside of the membrane filter 6 and is in transmission connection with the membrane filter cleaning mechanism connecting cylinder 33. The outer end of the membrane filter cleaning mechanism 30 is provided with a membrane filter outer scraper 31, and the inner end of the membrane filter cleaning mechanism 30 is provided with a membrane filter inner scraper 32. The outer end of the membrane filter outer scraper 31 is in abutment with the inner wall of the membrane filter 6, the inner end of the membrane filter inner scraper 32 is in abutment with the membrane filter filter cylinder 29, and the membrane filter outer scraper 31 and the membrane filter inner scraper 32 are fixedly connected through a scraper connecting rod 34.

[0030] The membrane filter cleaning mechanism motor 27 drives the membrane filter outer scraper 31 and the membrane filter inner scraper 32 to rotate synchronously, which can simultaneously clean the inner wall of the membrane filter 6 and the outer surface of the membrane filter filter cylinder 29, double-scrape the crystal attachment, efficiently solve the problem of filter assembly blockage, and prolong the service life of the membrane filter filter cylinder 29. The membrane filter pressure relief valve 28 can balance the internal pressure of the membrane filter 6, avoid damage to the components due to excessive pressure, and ensure the safety and filtering efficiency of the membrane filtering process.

[0031] Please refer to Figures 1-4, the lower end of the circulation pipe 12 is sealingly installed with a backwashing second valve 15, the other end of the backwashing second valve 15 is sealingly connected with a backwashing outlet pipe 14, the middle position of the ultrasonic disperser inlet pipe is sealingly installed with a backwashing first valve 17, the upper end of the backwashing first valve 17 is sealingly connected with a backwashing inlet pipe 16, the upper end inside the cyclone separator 4 is obliquely provided with a cyclone separator partition plate 35, the middle position below the cyclone separator partition plate 35 is sealingly installed with a cyclone reversing pipe 36, the outer part of the cyclone reversing pipe 36 and the inner wall of the cyclone separator 4 are provided with a cyclone groove 37, and the outer end of the cyclone reversing pipe 36 is fixedly installed with a cyclone separator threaded baffle 38. The lower part inside the cyclone separator 4 is fixedly installed with a distribution plate 40, the outer end of the cyclone reversing pipe 36 is annularly provided with a plurality of ultrasonic transducers 39, the lower part of the distribution plate 40 is equidistantly installed with a plurality of ultrasonic transducers 39, the lower end inside the cyclone reversing pipe 36 is installed with a pressure fan 41, the inner wall of the cyclone reversing pipe 36 is symmetrically installed with an upwardly inclined first baffle 42, the middle position of the inner wall of the cyclone reversing pipe 36 is fixedly installed with a second baffle 43, the two sides of the second baffle 43 are downwardly inclined and the inclination angle is the same as that of the first baffle 42, and the first baffle 42 and the second baffle 43 are arranged at intervals.

[0032] The cyclone separator partition plate 35, the cyclone reversing pipe 36, the cyclone groove 37, the cyclone separator threaded baffle 38, the pressure fan 41 and the inclined first baffle 42 and second baffle 43 cooperate to strengthen the cyclone effect of the material, improve the interception and separation efficiency of the ≥15μm fine crystals, the ultrasonic transducers 39 can disperse the material agglomeration fine crystals to provide uniform material for subsequent filtration, the backwashing first valve 17, the backwashing inlet pipe 16 and the backwashing second valve 15 and the backwashing outlet pipe 14 cooperate to conveniently backwash the cyclone separator 4, clean the inner wall by combining the cavitation effect of the ultrasonic transducers 39, complete the cleaning without disassembly, reduce the maintenance difficulty, and solve the problem of fine crystal accumulation in the mother liquid circulation.

[0033] Please refer to Figures 4-5The upper end of the gas-liquid separator 1 is provided with a filter screen 46, the upper end of the middle position of the filter screen 46 is provided with a gas-liquid separator cleaning mechanism motor 47, the middle position of the gas-liquid separator cleaning mechanism 44 is provided with a gas-liquid separator cleaning mechanism driving shaft 48, the gas-liquid separator cleaning mechanism driving shaft 48 is in transmission connection with the output end of the gas-liquid separator cleaning mechanism motor 47, the outer part of the gas-liquid separator cleaning mechanism driving shaft 48 is fixedly sleeved with a fixed rod 49, and one side of the fixed rod 49 is fixedly connected with a gas-liquid separator scraping frame 50. The other end of the gas-liquid separator cleaning mechanism 44 is provided with a cleaning spray frame 52, the other side of the fixed rod 49 is fixedly connected with the cleaning spray frame 52, the front end of the cleaning spray frame 52 is provided with a cleaning sliding guide rail track 54, and the outer part of the cleaning sliding guide rail track 54 is slidably provided with three cleaning sliding guide rail sliding blocks 53. The middle position of the cleaning sliding guide rail sliding block 53 close to the inner wall of the gas-liquid separator 1 is provided with a downwardly inclined cleaning nozzle 56, the adjacent cleaning sliding guide rail sliding blocks 53 are rotationally connected through a connecting rotating shaft 58, and a water distribution pipe 57 is arranged between the sides of the adjacent cleaning sliding guide rail sliding blocks 53, the water distribution pipe 57 is in sealing connection with the cleaning nozzle 56, and one side of the upper end of the gas-liquid separator 1 is provided with a telescopic total water inlet pipe 55, and the lower end of the total water inlet pipe 55 is in sealing connection with the cleaning nozzle 56.

[0034] The filter screen 46 can preliminarily remove impurities in the material entering the gas-liquid separator 1, so as to reduce the influence of the impurities on subsequent crystallization; the gas-liquid separator cleaning mechanism motor 47 drives the gas-liquid separator scraping frame 50 to scrape the crystallization on the inner wall through the rubber scraping strip 51, and the cleaning nozzle 56 on the cleaning spray frame 52 delivers cleaning water through the telescopic total water inlet pipe 55 and the water distribution pipe 57, cooperates with the cleaning sliding guide rail sliding block 53 to slide along the track and adjusts the angle through the connecting rotating shaft 58, realizes omnibearing and multi-angle spray cleaning of the inner wall of the gas-liquid separator 1, and realizes complete removal of the crystallization residues on the inner wall through scraping and spraying, so as to avoid the influence of crystallization adhesion on the gas-liquid separation effect, and the cleaning process is automatic, so that the manual cleaning intensity is reduced.

[0035] Working principle: when the system starts, the vacuum pump first separates the gas-liquid separator 1 and the evaporator 2 to the set vacuum degree. According to the principle that the lower the gas pressure, the lower the boiling point of the liquid, the solution can be boiled at a lower temperature in a vacuum environment, greatly reducing the energy required for heating. The supersaturated sodium sarcosinate solution is added through the liquid supplement pipe 22, and the solution passes through the liquid supplement valve 21 and the total liquid supplement pipe 23 into the preheater 59 for preheating, then enters the inside of the membrane filter outlet pipe 19 through the preheating liquid adding pipe 24, and is pumped into the evaporator 2 by the circulating pump 8, while a small amount of fresh steam is introduced into the evaporator heating chamber to preliminarily heat the solution to the boiling point. Solution evaporation and secondary steam generation After the solution reaches the boiling point, continuous boiling in the evaporation chamber, water vaporizes into secondary steam, and secondary steam enters the gas-liquid separator 1, which separates the secondary steam from the entrained liquid droplets and purifies the secondary steam. The steam enters the steam compressor 3 through the steam outlet pipe 9, is pressurized by the steam compressor 3, and is pumped into the evaporator 2 again, while the high-concentration liquid droplets enter the cyclone separator 4 through the circulating pipe 12, which intercepts ≥15μm fine crystals and returns them to the crystallization tank, then enters the ultrasonic disperser 5 again to disperse <15μm agglomerated fine crystals, and finally enters the membrane filter 6 to intercept 8-15μm fine crystals, allowing only <8μm fine crystals to pass through the membrane filter outlet pipe 19 and the evaporator inlet pipe 25 to re-enter the evaporator 2. The ultrasonic disperser is started once every 10 minutes for 1 minute each time to avoid fine crystal agglomeration and block the membrane filter element, prolonging the service life of the filter element. After 5 cycles of mother liquor circulation, the fine crystal concentration decreases from 5% to <1.2%; the multi-stage fine crystal interception combination of cyclone separation + ultrasonic dispersion + membrane filtration solves the interlocking problems of fine crystal accumulation, purity decrease, and filter element blockage in mother liquor circulation, and solves the problem of simple filtration interception. The crystals in the gas-liquid separator 1 enter the centrifugal device 7 after centrifugal separation through the crystallization outlet pipe 13, and then enter the preheater 59 for preheating before re-entering the circulation.When the gas-liquid separator 1 is cleaned, the gas-liquid separator cleaning mechanism motor 47 is started, the gas-liquid separator cleaning mechanism motor 47 drives the gas-liquid separator cleaning mechanism drive shaft 48 to rotate, the gas-liquid separator cleaning mechanism drive shaft 48 drives the gas-liquid separator scraping frame 50 and the cleaning spray frame 52 to rotate synchronously through the fixed rod 49, the rubber scraping strip 51 inside the gas-liquid separator scraping frame 50 is attached to the inner wall of the gas-liquid separator 1, thereby scraping off the adhered crystals on the inner wall, at the same time, the cleaning water is transmitted to the cleaning nozzle 56 through the total water inlet pipe 55, the cleaning water sprayed by the cleaning nozzle 56 promotes the crystals adhered to the inner wall to fall off, at the same time, the cleaning sliding guide sliding block 53 slides downward outside the cleaning sliding guide rail 54, thereby allowing the cleaning nozzle 56 to rotate circumferentially downward to clean the inner wall of the gas-liquid separator 1, when the cyclone separator 4 is cleaned, the backwashing liquid inlet pipe 16 is connected, the cleaning water enters the cyclone separator 4 through the liquid outlet and fills the cyclone separator 4, at this time, the ultrasonic transducer 39 is started to generate ultrasonic waves, when the ultrasonic waves propagate, a negative pressure is formed in the area, the micro bubbles in the liquid will rapidly expand to form cavitation bubbles with a diameter of several microns to tens of microns. With the change of ultrasonic wave period, the negative pressure area becomes a high pressure area, the expanded cavitation bubbles are rapidly compressed under the action of high pressure and are instantaneously collapsed. When the cavitation bubbles collapse, the internal pressure can suddenly rise to several thousand atmospheres, the temperature can reach several thousand degrees Celsius, and two key forces are generated, thereby vibrating and cleaning the inner wall of the cyclone separator 4, after cleaning, the cleaning water can be discharged through the backwashing liquid outlet pipe 14 and the cyclone separator 4 lower liquid outlet pipe, when the membrane filter 6 is cleaned, the membrane filter cleaning mechanism motor 27 is started, the membrane filter cleaning mechanism motor 27 drives the membrane filter cleaning mechanism connecting cylinder 33 to rotate, thereby driving the membrane filter outer scraping plate 31 and the membrane filter inner scraping plate 32 to rotate synchronously, thereby scraping off the inner wall of the membrane filter 6 and the outer surface of the membrane filter filter cylinder 29, reducing the situation that the crystals block the filter screen.

[0036] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims.

Claims

1. A crystallization apparatus for producing sarcosine sodium, comprising a gas-liquid separator (1), characterized by: The gas-liquid separator (1) is provided with an evaporator (2) on one side of the gas-liquid inlet, a cyclone separator (4) on one side of the liquid outlet of the gas-liquid separator (1), an ultrasonic disperser (5) on one side of the liquid outlet of the cyclone separator (4), a membrane filter (6) on one side of the liquid outlet of the ultrasonic disperser (5), and a circulating pump (8) on one side of the liquid outlet of the membrane filter (6); one side of the lower end of the gas-liquid separator (1) is connected to the liquid inlet end of the cyclone separator (4) through a circulating pipe (12); the liquid outlet end of the cyclone separator (4) is connected to the liquid inlet end of the ultrasonic disperser (5) through an ultrasonic disperser liquid inlet pipe; the liquid outlet end of the ultrasonic disperser (5) is connected to the liquid inlet end of the membrane filter (6) through a membrane filter feed pipe (18); the liquid outlet end of the membrane filter (6) is connected to the liquid inlet end of the circulating pump (8) through a membrane filter discharge pipe (19); the gas-liquid separator (1) is provided with a gas-liquid separator cleaning mechanism (44) inside; one end of the gas-liquid separator cleaning mechanism (44) is provided with a gas-liquid separator scraping frame (50); the inside of the gas-liquid separator scraping frame (50) is provided with a rubber scraping strip (51); the inside of the membrane filter (6) is provided with a membrane filter cleaning mechanism (30); The upper end of the membrane filter (6) is provided with a membrane filter cleaning mechanism motor (27); the inside of the membrane filter (6) is fixedly provided with a membrane filter filter cylinder (29); the other side of the upper end of the membrane filter (6) is sealingly provided with a membrane filter pressure relief valve (28); the upper end of the membrane filter cleaning mechanism (30) is provided with a membrane filter cleaning mechanism connecting cylinder (33); The output end of the membrane filter cleaning mechanism motor (27) extends into the inside of the membrane filter (6) and is drivingly connected to the membrane filter cleaning mechanism connecting cylinder (33); the outer end of the membrane filter cleaning mechanism (30) is provided with a membrane filter outer scraping plate (31); the inner end of the membrane filter cleaning mechanism (30) is provided with a membrane filter inner scraping plate (32); the outer end of the membrane filter outer scraping plate (31) is in contact with the inner wall of the membrane filter (6); the inner end of the membrane filter inner scraping plate (32) is in contact with the membrane filter filter cylinder (29); the membrane filter outer scraping plate (31) and the membrane filter inner scraping plate (32) are fixedly connected through a scraping plate connecting rod (34). The lower end of the circulating pipe (12) is sealingly installed with a backwashing second valve (15), the other end of the backwashing second valve (15) is sealingly connected with a backwashing liquid outlet pipe (14), the middle position of the ultrasonic disperser liquid inlet pipe is sealingly installed with a backwashing first valve (17), the upper end of the backwashing first valve (17) is sealingly connected with a backwashing liquid inlet pipe (16), the upper end inside the cyclone separator (4) is obliquely provided with a cyclone separator partition (35), the middle position below the cyclone separator partition (35) is sealingly installed with a cyclone reversing pipe (36), the outside of the cyclone reversing pipe (36) and the inner wall of the cyclone separator (4) are provided with a cyclone groove (37), and the outer end of the cyclone reversing pipe (36) is fixedly installed with a cyclone separator threaded baffle (38). The lower end inside the cyclone separator (4) is fixedly installed with a liquid distribution plate (40), the outer end of the cyclone reversing pipe (36) is annularly provided with a plurality of ultrasonic transducers (39), the lower end of the liquid distribution plate (40) is equidistantly installed with a plurality of ultrasonic transducers (39), the lower end inside the cyclone reversing pipe (36) is installed with a pressure fan (41), the inner wall of the cyclone reversing pipe (36) is symmetrically installed with an upwardly inclined first baffle (42), the middle position of the inner wall of the cyclone reversing pipe (36) is fixedly installed with a second baffle (43), the two sides of the second baffle (43) are downwardly inclined and the inclination angle is the same as that of the first baffle (42), and the first baffle (42) and the second baffle (43) are spaced apart.

2. The crystallization apparatus for producing sarcosinate sodium according to claim 1, characterized by: The liquid outlet end of the circulating pump (8) and the liquid inlet end of the evaporator (2) are sealingly connected through an evaporator liquid inlet pipe (25), one side of the gas-liquid separator (1) is installed with a vapor compressor (3), the gas outlet end of the vapor compressor (3) and the gas inlet end of the evaporator (2) are sealingly connected, the output end of the evaporator (2) is sealingly installed with a gas-liquid separator feed pipe (11), one end of the gas-liquid separator feed pipe (11) extends to the inside of the gas-liquid separator (1) and is fixedly installed with a feed hopper (45).

3. The crystallization apparatus for producing sarcosinate sodium according to claim 2, characterized by: The lower end of the gas-liquid separator (1) is sealingly installed with a crystallization discharge pipe (13), one side of the membrane filter (6) is installed with a centrifugal device (7), the other end of the crystallization discharge pipe (13) and the centrifugal device (7) are sealingly connected, one side of the circulating pump (8) is installed with a preheater (59), the liquid outlet end of the centrifugal device (7) and one side of the lower end of the preheater (59) are sealingly connected through a circulating liquid feeding pipe (20), one side of the upper end of the preheater (59) is sealingly installed with a preheating liquid feeding pipe (24), the preheating liquid feeding pipe (24) and the lower end of the membrane filter discharge pipe (19) are sealingly connected, the middle position of the circulating liquid feeding pipe (20) is installed with a liquid supplementing valve (21), the other side of the liquid supplementing valve (21) is sealingly connected with a liquid supplementing pipe (22), and the liquid outlet end of the evaporator (2) and the other side of the lower end of the circulating pump (8) are sealingly connected through a heat exchange pipe (26).

4. The crystallization apparatus for producing sarcosinate sodium according to claim 1, characterized by: The upper end of the gas-liquid separator (1) is provided with a filter screen (46), the upper end of the middle position of the filter screen (46) is provided with a gas-liquid separator cleaning mechanism motor (47), the middle position of the gas-liquid separator cleaning mechanism (44) is provided with a gas-liquid separator cleaning mechanism drive shaft (48), the gas-liquid separator cleaning mechanism drive shaft (48) is in transmission connection with the output end of the gas-liquid separator cleaning mechanism motor (47), the outer part of the gas-liquid separator cleaning mechanism drive shaft (48) is fixedly sleeved with a fixed rod (49), and one side of the fixed rod (49) is fixedly connected with a gas-liquid separator scraping frame (50).

5. The crystallization apparatus for producing sarcosinate sodium according to claim 4, characterized by: The other end of the gas-liquid separator cleaning mechanism (44) is provided with a cleaning spray frame (52), the other side of the fixed rod (49) is fixedly connected with the cleaning spray frame (52), the front end of the cleaning spray frame (52) is provided with a cleaning sliding guide rail track (54), and the outer part of the cleaning sliding guide rail track (54) is slidably provided with three cleaning sliding guide rail sliding blocks (53).

6. The crystallization apparatus for producing sarcosinate sodium according to claim 5, characterized by: The cleaning sliding guide rail sliding blocks (53) are provided with downwardly inclined cleaning nozzles (56) at the middle positions close to the inner wall of the gas-liquid separator (1), the adjacent cleaning sliding guide rail sliding blocks (53) are rotatably connected through connecting shafts (58), water distribution pipes (57) are arranged between the adjacent cleaning sliding guide rail sliding blocks (53), the water distribution pipes (57) are in sealing connection with the cleaning nozzles (56), and one side of the upper end of the gas-liquid separator (1) is provided with a telescopic total water inlet pipe (55), the lower end of the total water inlet pipe (55) is in sealing connection with the upper cleaning nozzles (56).

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