Sodium dihydrogen phosphate reaction purification device

Abstract

The utility model discloses a sodium dihydrogen phosphate reaction purification device which comprises a stirring and dissolving reaction kettle, a guide cylinder crystallizer, a low-temperature vacuum filter and a drying and crushing unit which are sequentially communicated and connected, and stirring units are arranged in the stirring and dissolving reaction kettle and the guide cylinder crystallizer; a heating device and a filtering structure are further arranged in the stirring and dissolving reaction kettle, the filtering structure can effectively intercept insoluble impurities, a slag discharging opening facilitates impurity cleaning, the filtering performance is guaranteed, a purer solution is provided for subsequent procedures, the stirring unit can accurately control the heating concentration and cooling crystallization process, sodium dihydrogen phosphate crystals are evenly separated out, and the purity of the sodium dihydrogen phosphate crystals is improved. The crystallization effect and the product yield are improved. In addition, all the parts of the whole device are tightly connected, integrated continuous production is achieved, the material transferring and waiting time in the middle link is shortened, the production efficiency is greatly improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, and more specifically, to a sodium dihydrogen phosphate reaction purification device. Background Technology

[0002] In the chemical production field, sodium dihydrogen phosphate (SDP) is an important chemical raw material widely used in food, pharmaceuticals, and other industries. However, traditional sodium dihydrogen phosphate reaction purification processes and equipment have many drawbacks. In the filtration stage, traditional filtration equipment cannot effectively meet the requirements of hot filtration and cannot promptly remove insoluble impurities generated during the reaction. These impurities enter the subsequent crystallization process, affecting the crystallization effect and product purity. During crystallization, the lack of precise control over solution density and temperature results in uneven precipitation of sodium dihydrogen phosphate crystals, poor crystallization effect, and low product yield. Moreover, the connections between processes in traditional equipment are not tight enough. From reaction, filtration, crystallization to drying and pulverization, material transfer and waiting times are long, leading to low overall production efficiency and increased production costs. Therefore, there is an urgent practical need to develop a sodium dihydrogen phosphate reaction purification device that can precisely control reaction conditions, efficiently filter and crystallize, and tightly connect each process. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a sodium dihydrogen phosphate reaction purification device, which aims to improve the traditional sodium dihydrogen phosphate purification process. In the filtration stage, traditional filtration equipment cannot effectively meet the requirements of hot filtration and cannot remove insoluble impurities generated during the reaction in a timely manner, which will affect the crystallization effect and product purity. At the same time, the connection between the various processes in the traditional device is not tight enough, and the material transfer and waiting time is long, resulting in low overall production efficiency and increased production costs.

[0004] This invention is achieved as follows: a sodium dihydrogen phosphate reaction purification device, comprising...

[0005] A stirred dissolving reactor is provided with a solid-liquid inlet connected to the top outer wall of the stirred dissolving reactor, a stirring unit is provided inside the stirred dissolving reactor, a heating device is provided inside the stirred dissolving reactor, and a discharge port is provided at the bottom of the stirred dissolving reactor, with a filter structure provided in the discharge port;

[0006] A flow guide tube crystallizer is provided, wherein the inlet of the flow guide tube crystallizer is connected to the outlet at the bottom of the stirring and dissolving reactor, and an exhaust port and a water inlet are respectively connected to the outer wall of the flow guide tube crystallizer. A density sensor is installed inside the flow guide tube crystallizer, and a stirring unit is also installed inside the flow guide tube crystallizer.

[0007] A low-temperature vacuum filter, wherein a solid discharge valve and a liquid discharge valve are respectively installed on the low-temperature vacuum filter;

[0008] The drying and pulverizing unit has its inlet connected to the solid discharge valve of the low-temperature vacuum filter.

[0009] In a preferred embodiment of this utility model, the filtration structure is a filter screen, which is fixedly connected to the inner wall of the discharge port of the stirring and dissolving reactor.

[0010] In a preferred embodiment of this utility model, a slag discharge port is provided on the outer wall of the discharge port side of the stirring and dissolving reactor, and the slag discharge port is located above the filter screen.

[0011] In a preferred embodiment of this invention, a pH sensor is also provided inside the stirred dissolution reactor.

[0012] In a preferred embodiment of this utility model, each stirring unit includes a drive motor. The drive motor is fixedly installed on the outer wall of the stirring and dissolving reactor or the guide tube crystallizer, and its output shaft is coaxially arranged with the stirring and dissolving reactor or the guide tube crystallizer. One end of the output shaft of the drive motor extends into the interior of the corresponding stirring and dissolving reactor or the guide tube crystallizer and is fixedly connected to one end of the stirring rod.

[0013] In a preferred embodiment of this utility model, the heating device is an electric heating device, which is installed in a heating jacket inside the stirring and dissolving reactor.

[0014] In a preferred embodiment of this utility model, the drying and pulverizing unit includes a dryer and a crusher. The feed inlet of the dryer is connected to a solid discharge valve installed on a low-temperature vacuum filter, and the discharge outlet of the dryer is connected to the feed inlet of the crusher.

[0015] The beneficial effects of this invention are as follows: The sodium dihydrogen phosphate reaction purification device obtained through the above design effectively intercepts insoluble impurities through the filter structure at the discharge port of the stirring and dissolving reactor, while the slag discharge port facilitates impurity cleaning, ensuring filtration performance and providing a purer solution for subsequent processes. The low-temperature vacuum filter achieves solid-liquid separation under low temperature and vacuum conditions, further improving product purity. Furthermore, the close integration of all parts of the device enables integrated continuous production, reducing material transfer and waiting time in intermediate stages, significantly improving production efficiency, and lowering production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic perspective view of the overall structure provided by the embodiment of this utility model;

[0018] Figure 2 A three-dimensional schematic cross-sectional view of the stirring and dissolving reactor provided for an embodiment of this utility model;

[0019] Figure 3 A schematic perspective view of the overall structure of the guide tube crystallizer provided for an embodiment of this utility model;

[0020] Figure 4 A flowchart illustrating the overall workflow of this utility model.

[0021] In the diagram: 1. Stirred dissolving reactor; 2. Guide tube crystallizer; 3. Low temperature vacuum filter; 101. Solid-liquid feed inlet; 102. Drive motor; 103. Stirring rod; 104. Filter screen; 105. Slag discharge port; 201. Exhaust port; 202. Water inlet. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Please see Figures 1 to 4 This utility model provides a technical solution: a sodium dihydrogen phosphate reaction purification device, comprising...

[0024] The stirred dissolving reactor 1 has a solid-liquid inlet 101 connected to the top outer wall, a stirring unit inside the stirred dissolving reactor 1, a heating device inside the stirred dissolving reactor 1, and a discharge port connected to the bottom of the stirred dissolving reactor 1, with a filter structure installed in the discharge port.

[0025] The guide tube crystallizer 2 has its inlet connected to the outlet at the bottom of the stirring and dissolving reactor 1. The outer wall of the guide tube crystallizer 2 is connected to an exhaust port 201 and a water inlet 202. The guide tube crystallizer 2 is equipped with a density sensor and a stirring unit.

[0026] The low-temperature vacuum filter 3 is equipped with a solid discharge valve and a liquid discharge valve.

[0027] The drying and pulverizing unit has its feed inlet connected to the solid discharge valve of the low-temperature vacuum filter 3.

[0028] Please see Figure 2 The filtration structure is a filter screen 104, which is fixedly connected to the inner wall of the discharge port of the stirred dissolving reactor 1.

[0029] Filter screen 104 is fixedly installed on the inner wall of the discharge port of the stirred dissolving reactor 1. When the reacted solution flows out of the discharge port, insoluble impurities are intercepted by filter screen 104, and only the clear solution can pass through the filter screen and enter the next processing stage. The filter screen has a simple structure and low cost, but it can effectively remove insoluble impurities from the solution, prevent these impurities from entering the subsequent crystallization and purification processes, reduce interference with subsequent processes, and improve the purity and quality of the product.

[0030] Furthermore, a slag discharge port 105 is connected to the outer wall of the discharge port side of the stirring and dissolving reactor 1, and the slag discharge port 105 is located above the filter screen 104.

[0031] When the insoluble impurities intercepted on the filter screen 104 accumulate to a certain extent, the slag discharge port 105 is opened, and the impurities are discharged from the slag discharge port 105 using pressure difference or other auxiliary means (such as flushing), ensuring the filtration performance of the filter screen. The presence of the slag discharge port 105 makes cleaning the filter screen more convenient, allowing impurities to be cleaned without disassembling the filter screen, reducing equipment maintenance time and workload, and improving the continuous operation capability and production efficiency of the equipment.

[0032] Furthermore, a pH sensor is also installed inside the stirred dissolution reactor 1.

[0033] A pH sensor is installed inside the stirred dissolution reactor 1 to continuously monitor the pH value of the solution. When the pH value deviates from the set optimal reaction range, the operator can add an appropriate amount of phosphoric acid or sodium hydroxide solution through the solid-liquid inlet 101 to adjust the pH of the solution and direct the reaction towards the formation of more sodium dihydrogen phosphate. Precise pH monitoring and adjustment ensures efficient reaction, improves the formation rate of sodium dihydrogen phosphate and product quality, and avoids problems such as increased side reactions and reduced product purity caused by unsuitable reaction conditions.

[0034] Furthermore, each stirring unit includes a drive motor 102, which is fixedly installed on the outer wall of the stirring and dissolving reactor 1 or the guide tube crystallizer 2, and its output shaft is coaxially arranged with the stirring and dissolving reactor 1 or the guide tube crystallizer 2. One end of the output shaft of the drive motor 102 extends into the corresponding stirring and dissolving reactor 1 or the guide tube crystallizer 2 and is fixedly connected to one end of the stirring rod 103.

[0035] The drive motor 102 is fixedly installed on the outer wall of the stirred dissolution reactor 1 or the guide tube crystallizer 2, with its output shaft coaxial with the equipment. After the drive motor 102 is started, the output shaft drives the stirring rod 103 to rotate inside the equipment, stirring the solution. In the stirred dissolution reactor, stirring helps the sodium hydroxide solution and phosphoric acid to mix and react fully; in the guide tube crystallizer, stirring causes sodium dihydrogen phosphate in the solution to crystallize and precipitate more uniformly. A reasonable stirring unit design can improve the efficiency and uniformity of the reaction and crystallization. Sufficient stirring ensures more complete contact between reactants, accelerating the reaction rate; during the crystallization process, uniform stirring helps to form crystals of uniform size and high purity, improving product quality and yield.

[0036] Furthermore, the heating device is an electric heating device, which is installed in the heating jacket inside the stirred dissolving reactor 1.

[0037] The electric heating device (not shown in the attached diagram) generates heat when powered on. This heat is transferred to the solution in the stirring and dissolving reactor through a heating jacket (not shown in the attached diagram), raising the solution temperature to the appropriate reaction temperature. Operators can adjust the heating rate and temperature by controlling the power of the electric heating device, ensuring the reaction proceeds under optimal temperature conditions. The electric heating device offers advantages such as rapid heating and precise temperature control, allowing for timely temperature adjustments as needed for the reaction. The heating jacket design ensures even heat transfer to the solution, preventing localized overheating or undercooling, guaranteeing reaction stability and consistency, and improving product quality.

[0038] Furthermore, the drying and pulverizing unit includes a dryer and a crusher. The feed inlet of the dryer is connected to the solid discharge valve installed on the low-temperature vacuum filter 3, and the discharge outlet of the dryer is connected to the feed inlet of the crusher.

[0039] Solid material discharged from the solid discharge valve of the low-temperature vacuum filter first enters the dryer. The dryer removes moisture from the material through heating, bringing it to the specified degree of dryness. The dried material then enters the crusher through the dryer's outlet. The crusher uses mechanical force to break the material into the required particle size, ultimately yielding the qualified sodium dihydrogen phosphate product. Separate dryer and crusher configurations allow for more precise control of the drying and crushing processes. The drying process ensures the material's moisture content meets standards, which is beneficial for product storage and use; the crushing process ensures uniform particle size, improving product applicability.

[0040] Working principle: as shown in the appendix Figure 4 As shown, sodium hydroxide solution and phosphoric acid are first added through the solid-liquid inlet 101 at the top of the stirring and dissolving reactor 1. The drive motor 102 is started to drive the stirring rod 103 to stir and mix them thoroughly. The electric heating device heats the solution through the heating jacket. The pH sensor monitors the acidity and alkalinity of the solution in real time and adjusts it through the inlet. After the reaction is completed, the solution is discharged through the bottom outlet. The filter screen 104 of the outlet intercepts insoluble impurities. When there are too many impurities, the slag outlet 105 is opened to discharge them. The solution after preliminary filtration flows into the guide tube crystallizer 2. During heating and concentration, the density sensor monitors the density. Heating is stopped when the set range is reached. Then, cooling water is introduced through the water inlet 202. The stirring unit makes sodium dihydrogen phosphate crystallize uniformly. The exhaust port 201 discharges the gas generated by heating. After crystallization is completed, the material is discharged. Then, the material enters the low temperature vacuum filter 3. The refrigeration system maintains the low temperature. The vacuum pump forms a vacuum to achieve solid-liquid separation. The liquid is discharged through the liquid discharge valve, and the solid filter cake is discharged through the solid discharge valve. Finally, the filter cake first enters the dryer to remove moisture, and then enters the crusher to be crushed into the specified particle size to obtain the finished sodium dihydrogen phosphate product that meets the requirements.

[0041] It should be noted that the specific models and specifications of the stirred dissolving reactor 1, the guide tube crystallizer 2, the low temperature vacuum filter 3, the electric heating device, the density sensor, the dryer, the crusher, the pH sensor, and the drive motor 102 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0042] The power supply and principles of the stirred dissolving reactor 1, the guide tube crystallizer 2, the low-temperature vacuum filter 3, the electric heating device, the density sensor, the dryer, the crusher, the pH sensor, and the drive motor 102 are clear to those skilled in the art and will not be described in detail here.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sodium dihydrogen phosphate reaction purification apparatus, characterized in that, include A stirred dissolving reactor is provided with a solid-liquid inlet connected to the top outer wall of the stirred dissolving reactor, a stirring unit is provided inside the stirred dissolving reactor, a heating device is provided inside the stirred dissolving reactor, and a discharge port is provided at the bottom of the stirred dissolving reactor, with a filter structure provided in the discharge port; A flow guide tube crystallizer is provided, wherein the inlet of the flow guide tube crystallizer is connected to the outlet at the bottom of the stirring and dissolving reactor, and an exhaust port and a water inlet are respectively connected to the outer wall of the flow guide tube crystallizer. A density sensor is installed inside the flow guide tube crystallizer, and a stirring unit is also installed inside the flow guide tube crystallizer. A low-temperature vacuum filter, wherein a solid discharge valve and a liquid discharge valve are respectively installed on the low-temperature vacuum filter; The drying and pulverizing unit has its inlet connected to the solid discharge valve of the low-temperature vacuum filter.

2. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 1, characterized in that: The filtration structure is a filter screen, which is fixedly connected to the inner wall of the discharge port of the stirred dissolving reactor.

3. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 2, characterized in that: A slag discharge port is connected to the outer wall of the discharge port side of the stirring and dissolving reactor, and the slag discharge port is located above the filter screen.

4. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 1, characterized in that: The stirred dissolution reactor is also equipped with a pH sensor.

5. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 1, characterized in that: Each of the stirring units includes a drive motor, which is fixedly installed on the outer wall of the stirring and dissolving reactor or the guide tube crystallizer and its output shaft is coaxially arranged with the stirring and dissolving reactor or the guide tube crystallizer. One end of the output shaft of the drive motor extends into the interior of the corresponding stirring and dissolving reactor or the guide tube crystallizer and is fixedly connected to one end of the stirring rod.

6. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 1, characterized in that: The heating device is an electric heating device, which is installed in a heating jacket inside the stirred dissolving reactor.

7. The sodium dihydrogen phosphate reaction purification apparatus as described in claim 1, characterized in that: The drying and pulverizing unit includes a dryer and a crusher. The feed inlet of the dryer is connected to the solid discharge valve installed on the low-temperature vacuum filter, and the discharge outlet of the dryer is connected to the feed inlet of the crusher.

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