A multi-stage purification system for continuous production of phosphate esters

Abstract

This utility model discloses a multi-stage purification device for continuous production of phosphate esters, relating to the field of phosphate ester production technology. It includes a heat-insulated negative pressure evaporator, with multiple heating collection hoppers evenly distributed on the inner wall of the evaporator, the smaller ends of which face downwards. A servo drive motor is fixedly connected to the center of the bottom of the evaporator, and a central rotating shaft is rotatably mounted at the center of the evaporator, passing through the center of the multiple heating collection hoppers. By incorporating an alcohol-ester separation bowl and an annular filter cover, alcohols in the phosphate ester solution can be separated, preventing alcohol residue in the solution and improving the purity of the phosphate ester. Through continuous evaporation via the multi-stage heating collection hoppers, the purity of the phosphate ester is gradually increased, achieving continuous production and effectively solving the problems of high steam consumption and low efficiency in traditional single-stage evaporators.

Description

Technical Field

[0001] This utility model relates to the field of phosphate ester production technology, specifically to a multi-stage purification device for continuous production of phosphate esters. Background Technology

[0002] Phosphate esters are important chemical raw materials, widely used in industries such as plastics, rubber, textiles, printing and dyeing, papermaking, leather, food, and pharmaceuticals.

[0003] Purification is a crucial step in the production of phosphate esters, directly impacting product quality and purity. The purification process requires multiple evaporation and concentration stages for alcohol recovery. Traditional single-stage evaporators consume relatively large amounts of steam, increasing energy consumption and resulting in low efficiency due to repeated heating and evaporation, hindering continuous production. Therefore, we propose a multi-stage purification system for continuous phosphate ester production. Utility Model Content

[0004] The purpose of this invention is to address the problem that traditional single-stage evaporators consume relatively large amounts of steam during operation, which not only increases energy consumption but also results in low efficiency due to repeated heating and evaporation, making continuous production impossible. This invention provides a multi-stage purification device for the continuous production of phosphate esters.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A multi-stage purification device for continuous production of phosphate esters includes a heat-insulated negative pressure evaporator. Multiple heating collection hoppers are evenly spaced along the inner wall of the heat-insulated negative pressure evaporator, with the smaller ends of the hoppers facing downwards. A servo drive motor is fixedly connected to the center of the bottom of the heat-insulated negative pressure evaporator, and a central rotating shaft is rotatably mounted at the center of the heat-insulated negative pressure evaporator. The central rotating shaft passes through the center of the multiple heating collection hoppers, and its bottom passes through the heat-insulated negative pressure evaporator and is fixedly connected to the output shaft of the servo drive motor. An alcohol-ester separation bowl is fixedly connected to the upper side of each heating collection hopper on the outer wall of the central rotating shaft, and an annular filter cover is fixedly connected to the upper end of each alcohol-ester separation bowl. The alcohol-ester separation bowl has a bowl-shaped structure with the smaller end facing downwards, and the outer diameter of the top of the alcohol-ester separation bowl is smaller than the inner diameter of the heat-insulated negative pressure evaporator. The alcohol-ester separation bowl contains a boiling aid.

[0007] Furthermore, a steam spiral coil is embedded in the side wall of the heating collection hopper, and the two ends of the steam spiral coil are connected to the steam supply equipment through pipes after passing through the heat-insulating negative pressure evaporation tank.

[0008] Furthermore, the top of the heat-insulating negative pressure evaporation tank is provided with a raw material inlet, and the raw material inlet is connected to the output end of the outlet pump of the phosphate deacidification tower through a metering valve. The bottom of the heat-insulating negative pressure evaporation tank is provided with a liquid outlet pipe, and the liquid outlet pipe is connected to the liquid inlet of the phosphate neutralization reaction tower through a pipe.

[0009] Furthermore, a spiral baffle is fixedly connected to the inner wall of the heating liquid collection hopper, and the spiral baffle is a spiral protrusion that is inclined downward on the inward side.

[0010] Furthermore, a vacuum port is provided on one side of the upper end of the heat-insulating negative pressure evaporation tank, and the vacuum port is connected to a vacuum pump through a check valve.

[0011] Furthermore, the center of the heating liquid collecting hopper is provided with a boss around the central rotating shaft, and the center of the heating liquid collecting hopper is rotatably connected to the central rotating shaft through a sealed bearing.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention features an alcohol-ester separation bowl and an annular filter cover. The separation bowl contains a boiling aid, which is made of a metal-organic framework material, specifically a zinc imidazole ester framework with a pore size of 3.4 mm. The precise matching of methanol / ethanol kinetic diameters and the generation of capillary forces through nanoscale channels reduce the energy required for alcohol vaporization. Organic ligand functional groups disrupt alcohol clusters, such as ethanol hexamers, reducing the molecular size of evaporating molecules and improving evaporation efficiency. The alcohol-ester separation bowl and annular filter cover can separate alcohols in the phosphate ester solution, preventing alcohol residues and improving the purity of the phosphate ester. Furthermore, a servo-driven motor drives the central shaft to rotate, which in turn drives the alcohol-ester separation bowl and annular filter cover to rotate. The servo-driven motor intermittently switches speeds; at low speeds, it stirs the phosphate ester solution, improving the evaporation effect; at high speeds, it uses centrifugal force to throw the evaporated raw material solution into the next stage heating collection hopper. Through continuous evaporation in multi-stage heating collection hoppers, the purity of the phosphate ester is gradually improved, achieving continuous production and effectively solving the problems of high steam consumption and low efficiency in traditional single-stage evaporators.

[0014] This invention, by setting a spiral baffle, can guide the phosphate ester solution, allowing the phosphate ester solution to flow down along the spiral baffle, thereby extending the residence time of the phosphate ester solution in the heating collection hopper and improving the evaporation effect.

[0015] This invention, by connecting a vacuum pump to a vacuum port and a check valve, can continuously evacuate the insulated negative pressure evaporation tank, reducing the gas pressure inside and thus lowering the boiling point of the phosphate ester solution, improving the evaporation effect. Simultaneously, it continuously extracts the evaporated alcohol gas, preventing its accumulation inside the tank and ensuring optimal evaporation. Furthermore, the check valve prevents backflow of gas within the tank, guaranteeing stable operation of the device. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a front sectional view of the present invention;

[0018] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a top sectional view of the present invention.

[0020] Attached reference numerals: 1. Insulated negative pressure evaporation tank; 2. Heating collection hopper; 3. Servo drive motor; 4. Central rotating shaft; 5. Alcohol-ester separation bowl; 6. Annular filter screen cover; 7. Connecting hole; 8. Sealed bearing; 9. Spiral baffle plate; 10. Steam spiral coil; 11. Raw material inlet; 12. Metering valve; 13. Vacuum port; 14. Check valve; 15. Liquid outlet pipe. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1 - Figure 4This utility model provides a multi-stage purification device for continuous production of phosphate esters, including a heat-insulated negative pressure evaporator 1. Multiple heating collection hoppers 2 are evenly distributed on the inner wall of the heat-insulated negative pressure evaporator 1, with the smaller ends of the heating collection hoppers 2 facing downwards. A servo drive motor 3 is fixedly connected to the center of the bottom of the heat-insulated negative pressure evaporator 1, and a central rotating shaft 4 is rotatably mounted at the center of the heat-insulated negative pressure evaporator 1. The central rotating shaft 4 passes through the center of the multiple heating collection hoppers 2, and its bottom passes through the heat-insulated negative pressure evaporator 1 and is fixedly connected to the output shaft of the servo drive motor 3. An alcohol-ester separation bowl 5 is fixedly connected to the upper side of each heating collection hopper 2 on the outer wall of the central rotating shaft 4, and an annular filter cover 6 is fixedly connected to the upper end of the alcohol-ester separation bowl 5. The alcohol-ester separation bowl 5 has a bowl-shaped structure with the smaller end facing downwards, and the outer diameter of the top of the alcohol-ester separation bowl 5 is smaller than the inner diameter of the heat-insulated negative pressure evaporator 1. The alcohol-ester separation bowl 5 is filled with a boiling aid.

[0023] The working principle and usage process of this utility model are as follows: In use, an alcohol-ester separation bowl 5 and an annular filter cover 6 are installed. The alcohol-ester separation bowl 5 contains a boiling aid, which is made of a metal-organic framework material, specifically a zinc imidazole ester framework with a pore size of 3.4 mm. The precise matching of methanol / ethanol kinetic diameters and the generation of capillary forces through nanoscale pores reduce the energy required for alcohol vaporization. Organic ligand functional groups disrupt alcohol clusters, such as ethanol hexamers, reducing the molecular size of evaporating molecules and improving evaporation efficiency. The alcohol-ester separation bowl 5 and the annular filter cover 6 can separate alcohols in the phosphate ester solution, preventing alcohol residues from remaining in the phosphate ester solution and improving the purity of the phosphate ester. Furthermore, by setting a servo drive motor 3 to drive the central rotating shaft 4 to rotate, the alcohol-ester separation bowl 5 and the annular filter cover 6 can be rotated. The servo drive motor 3 intermittently switches speeds. At low speeds, it stirs the phosphate ester solution to improve the evaporation efficiency. At high speeds, it uses centrifugal force to throw the evaporated and separated raw material solution into the next stage heating collection hopper 2. Through continuous evaporation in the multi-stage heating collection hopper 2, the purity of the phosphate ester is gradually improved, achieving the goal of continuous production. This effectively solves the problems of high steam consumption and low efficiency in traditional single-stage evaporators.

[0024] In this embodiment, preferably, a steam spiral coil 10 is embedded in the side wall of the heating collection tank 2, and the two ends of the steam spiral coil 10 pass through the heat-insulating negative pressure evaporation tank 1 and are connected to the steam supply equipment through pipes; by setting the steam spiral coil 10 to heat the heating collection tank 2, the steam spiral coil 10 is evenly distributed on the side wall of the heating collection tank 2, making the heating more uniform and improving the evaporation efficiency.

[0025] In this embodiment, preferably, the top of the heat-insulated negative pressure evaporation tank 1 is provided with a raw material inlet 11, and the raw material inlet 11 is connected to the output end of the outlet pump of the phosphate ester deacidification tower through a metering valve 12. The bottom of the heat-insulated negative pressure evaporation tank 1 is provided with a liquid outlet pipe 15, and the liquid outlet pipe 15 is connected to the inlet of the phosphate ester neutralization reaction tower through a pipe. By providing the raw material inlet 11 and the metering valve 12, the phosphate ester solution can be easily added into the heat-insulated negative pressure evaporation tank 1. By providing the metering valve 12, the amount of phosphate ester solution added can be controlled to achieve continuous purification processing. By providing the liquid outlet pipe 15, the evaporated phosphate ester solution can be easily discharged.

[0026] In this embodiment, preferably, a spiral baffle plate 9 is fixedly connected to the inner wall of the heating collection tank 2, and the spiral baffle plate 9 is a spiral protrusion that is inclined downward on the inward side; by setting the spiral baffle plate 9, the phosphate ester solution can be guided, so that the phosphate ester solution flows down along the spiral baffle plate 9, prolonging the residence time of the phosphate ester solution in the heating collection tank 2 and improving the evaporation effect.

[0027] In this embodiment, preferably, a vacuum port 13 is provided on one side of the upper end of the insulated negative pressure evaporation tank 1, and the vacuum port 13 is connected to a vacuum pump through a check valve 14. By providing the vacuum port 13 and the check valve 14 connected to the vacuum pump, continuous evacuation can be performed inside the insulated negative pressure evaporation tank 1 to reduce the gas pressure inside the tank, thereby lowering the boiling point of the phosphate ester solution and improving the evaporation effect. At the same time, the evaporated alcohol gas is continuously extracted to prevent the alcohol gas from accumulating inside the tank and affecting the evaporation effect. In addition, by providing the check valve 14, backflow of gas inside the insulated negative pressure evaporation tank 1 can be prevented, ensuring the stable operation of the device.

[0028] In this embodiment, preferably, the heating collection hopper 2 has a ring of bosses surrounding the central rotating shaft 4, and the center of the heating collection hopper 2 is rotatably connected to the central rotating shaft 4 via a sealed bearing 8. The ring of bosses and the sealed bearing 8 ensure the stability of the heating collection hopper 2 when the central rotating shaft 4 rotates, while preventing leakage of the phosphate ester solution, thus guaranteeing the continuous and stable operation of the equipment. Furthermore, the boss design increases the structural strength of the heating collection hopper 2 and extends its service life.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage purification apparatus for continuous production of phosphonates, characterized by: The device includes a heat-insulating negative pressure evaporator (1), on which multiple heating collection hoppers (2) are evenly distributed on the inner wall, with the smaller ends of the heating collection hoppers (2) facing downwards. A servo drive motor (3) is fixedly connected to the center of the bottom of the heat-insulating negative pressure evaporator (1), and a central rotating shaft (4) is rotatably mounted at the center of the heat-insulating negative pressure evaporator (1). The central rotating shaft (4) passes through the center of the multiple heating collection hoppers (2), and the bottom of the central rotating shaft (4) passes through the heat-insulating negative pressure evaporator. The output shaft of the servo drive motor (3) is fixedly connected to the outer wall of the central rotating shaft (4). An alcohol-ester separation bowl (5) is fixedly connected to the upper side of each heating collection tank (2). An annular filter screen cover (6) is fixedly connected to the upper end of the alcohol-ester separation bowl (5). The alcohol-ester separation bowl (5) is a bowl-shaped structure with the small end facing down. The outer diameter of the top of the alcohol-ester separation bowl (5) is smaller than the inner diameter of the heat-insulating negative pressure evaporation tank (1). The alcohol-ester separation bowl (5) is filled with a boiling aid.

2. A multi-stage purification apparatus for continuous production of phosphonates according to claim 1, characterized in that: The side wall of the heating liquid collection tank (2) is embedded with a steam spiral coil (10), and the two ends of the steam spiral coil (10) are connected to the steam supply equipment through pipes after passing through the heat-insulating negative pressure evaporation tank (1).

3. A multi-stage purification apparatus for continuous production of phosphonates according to claim 1, characterized in that: The top of the heat-insulating negative pressure evaporator (1) is provided with a raw material inlet (11), and the raw material inlet (11) is connected to the outlet pump output end of the phosphate deacidification tower through a metering valve (12). The bottom of the heat-insulating negative pressure evaporator (1) is provided with a liquid outlet pipe (15), and the liquid outlet pipe (15) is connected to the liquid inlet of the phosphate neutralization reaction tower through a pipe.

4. A multi-stage purification apparatus for continuous production of phosphonates according to claim 1, characterized in that: The inner wall of the heating liquid collection hopper (2) is fixedly connected to a spiral baffle plate (9), and the spiral baffle plate (9) is a spiral protrusion that is inclined downward on the inward side.

5. A multi-stage purification apparatus for continuous production of phosphonates according to claim 1, characterized in that: The upper side of the heat-insulating negative pressure evaporation tank (1) is provided with a vacuum port (13), and the vacuum port (13) is connected to a vacuum pump through a check valve (14).

6. A multi-stage purification apparatus for continuous production of phosphonates according to claim 1, characterized by: The heating liquid collecting hopper (2) has a boss around the central rotating shaft (4) at its center, and the center of the heating liquid collecting hopper (2) is rotatably connected to the central rotating shaft (4) through a sealed bearing (8).

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