Separation system of sodium chloride in phoxim synthetic wastewater

Abstract

The application provides a separation system of sodium chloride in phoxim synthesis wastewater, comprising: a rectifying tower, a treatment kettle, a filter and an evaporator connected in sequence; the inlet of the rectifying tower is communicated with an acidified raw water tank, the top outlet of the rectifying tower is communicated with a methanol tank through a condenser, the bottom outlet of the rectifying tower is communicated with the treatment kettle, the inlet of the treatment kettle is further communicated with a lye tank and an activated carbon tank, and the outlet of the treatment kettle is sequentially communicated with the filter, the evaporator and a sodium chloride collecting tank. The application realizes efficient and low-cost recovery of sodium chloride in phoxim synthesis wastewater.

Description

Technical Field

[0001] This application relates to the field of chemical wastewater treatment technology, and in particular to a sodium chloride separation system for phorate synthesis wastewater. Background Technology

[0002] Phoxim, chemical formula C 12 H 15 N2O3PS is an organophosphate insecticide that primarily acts through contact and stomach poisoning, and is highly effective against lepidopteran larvae. Phoxim has a broad insecticidal spectrum and strong knockdown effect, making it suitable for controlling underground pests. It has good effects on the larvae of various lepidopteran pests that damage crops such as peanuts, wheat, rice, cotton, corn, fruit trees, vegetables, mulberry, and tea, and also has some killing effect on insect eggs. It is also suitable for controlling pests in warehouses and sanitary facilities.

[0003] The main process steps in the production of phorate are as follows: phenylacetaldehyde reacts with hydroxylamine under weakly acidic or neutral conditions to produce phenylacetaldehyde oxime; phenylacetaldehyde oxime reacts with sodium cyanide (NaCN) under acidic conditions to produce the key intermediate α-cyanophenylpyrimidine; α-cyanophenylpyrimidine condenses with O,O-diethylthiophosphoryl chloride under alkaline conditions to produce phorate. Methanol is used as a solvent in the reaction of the intermediate α-cyanophenylpyrimidine. Simultaneously, sodium chloride, a byproduct, is generated during the production process and dissolves in the aqueous wastewater generated after the reaction. Therefore, the wastewater obtained after the reaction has a high COD, is acidic, and contains a large amount of sodium chloride; it is called acidified wastewater.

[0004] This type of acidic, high-salt, high-COD wastewater containing sodium chloride is a common type of high-salt wastewater in chemical production processes. Direct discharge can cause mass death of organisms and plants, harming the environment. Current technology involves first removing COD from the acidified wastewater through oxidation with large amounts of hydrogen peroxide, followed by distillation to separate sodium chloride. However, this method not only requires large quantities of hydrogen peroxide, resulting in high treatment costs, but also poses significant safety risks. Furthermore, the acid and salts during the treatment process can corrode equipment, reducing its lifespan and affecting the efficiency of sodium chloride recovery. Utility Model Content

[0005] This application provides a sodium chloride separation system for phorate synthesis wastewater to solve the problems mentioned in the background art.

[0006] This application provides a sodium chloride separation system for phoxim synthesis wastewater, comprising: a distillation column, a treatment vessel, a filter, and an evaporator connected in sequence; The inlet of the distillation column is connected to the acidified raw water tank. The top outlet of the distillation column is connected to the methanol tank through the condenser. The bottom outlet of the distillation column is connected to the treatment vessel. The inlet of the treatment vessel is also connected to the alkali tank and the activated carbon tank. The outlet of the treatment vessel is connected in sequence to the filter, the evaporator and the sodium chloride collection tank.

[0007] Optionally, the processing vessel is equipped with a stirring device, including: The system includes a motor, a connecting rod, a first gear, a second gear, a rotating shaft, and a stirring tube. The output end of the motor is connected to one end of the connecting rod. The first gear is fixedly sleeved on the outer circumference of the connecting rod. The rotating shaft extends vertically into the processing vessel. The second gear is sleeved on the rotating shaft outside the processing vessel. The first gear and the second gear are meshed together. The stirring tube is located on the outer circumference of the rotating shaft.

[0008] Optionally, the stirring device may also include an airflow stirring unit: The airflow mixing unit includes a high-pressure air pump, an air supply pipe, and a rotary joint connected in sequence. The end of the rotary joint away from the air supply pipe is connected to the top of the rotating shaft. Multiple aeration heads are connected to the stirring tube; Both the rotating shaft and the stirring tube are hollow structures.

[0009] Optionally, the airflow stirring unit also includes a lifting structure, which includes: a telescopic pipe, a gas supply branch pipe, an annular gas supply pipe, a hydraulic telescopic rod, and a connecting rod. The two ends of the telescopic pipe are respectively connected to the gas supply pipe and the gas supply branch pipe. The gas supply branch pipe extends vertically into the treatment vessel, and the end of the gas supply branch pipe located in the treatment vessel is connected to the annular gas supply pipe. Multiple aeration heads are connected to the annular gas supply pipe. The hydraulic telescopic rod is fixedly installed on the top of the processing vessel by a bracket. The fixed end of the hydraulic telescopic rod is fixedly connected to the bracket, and the telescopic end of the hydraulic telescopic rod is fixedly connected to the gas transmission pipe by a connecting rod.

[0010] Optionally, the aeration heads on the stirring tube and the annular air supply tube include: an aeration head for upward air jetting, an aeration head for downward air jetting, and an aeration head for side air jetting.

[0011] Optionally, the angle between the stirring tube and the rotating shaft is 45-120°.

[0012] Optionally, a pressure regulating valve is provided on the top of the processing vessel.

[0013] The sodium chloride separation system for phoxim synthesis wastewater provided in this application achieves the separation and recovery of sodium chloride from phoxim synthesis wastewater, and has the following advantages compared with the prior art: (1) This application first uses a distillation column to distill the acidified wastewater, separating and storing the methanol in the wastewater. Then, the methanol-free wastewater is transported to a treatment vessel for conditioning. Activated carbon is supplied to the treatment vessel through an activated carbon tank, and alkali solution is supplied to the treatment vessel through an alkali solution tank. The activated carbon adsorbs the COD in the wastewater and decolorizes the wastewater, improving the quality of the recovered sodium chloride. The alkali solution neutralizes the acid in the wastewater, further generating sodium chloride, thus improving the recovery efficiency and amount of sodium chloride. Finally, the wastewater is filtered through a filter and evaporated in an evaporator to obtain solid sodium chloride. This avoids the high cost and safety risks caused by the large-scale use of hydrogen peroxide in the prior art, while improving the recovery efficiency of sodium chloride.

[0014] (2) By setting up an airflow stirring unit, including a high-pressure air pump, an air delivery pipe and a rotary joint connected in sequence, mechanical stirring can be assisted, thereby reducing the output power of the motor and reducing energy consumption during use. At the same time, during the stirring process, the rising, breaking and stirring of bubbles will form turbulence in the wastewater, thereby promoting mixing. Compared with mechanical stirring, it has the advantages of gentle and uniform mixing, and reduces the breakage of activated carbon during the stirring process.

[0015] (3) By setting a lifting structure for the airflow stirring unit, including: telescopic pipe, gas delivery branch pipe, annular gas delivery pipe, hydraulic telescopic rod and connecting rod, the annular gas delivery pipe can be lifted vertically and work together with the stirring device. During the airflow stirring process, the upper, middle and lower parts of the wastewater in the treatment vessel can be uniformly stirred, further improving the adsorption of impurities in the wastewater by activated carbon, improving the reaction of acid and alkali in the wastewater, and thus improving the wastewater treatment efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a sodium chloride separation system in phoxim synthesis wastewater provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a stirring device provided in one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a stirring device provided in another embodiment of this application; Explanation of reference numerals in the attached figures: 1: Distillation column; 2: Processing vessel; 3: Filter; 4: Evaporator; 5: Sodium chloride collection tank; 110: Acidified raw water tank; 120: Condenser; 130: Methanol tank; 201: Alkali tank; 202: Activated carbon tank; 210: Motor; 220: Connecting rod; 230: First gear; 240: Second gear; 250: Rotary shaft; 260: Stirring tube; 270: Pressure regulating valve; 610: High-pressure air pump; 620: Gas supply pipe; 630: Rotary joint; 640: Aeration head; 710: Telescopic pipe; 720: Gas supply branch pipe; 730: Annular gas supply pipe; 740: Hydraulic telescopic rod; 750: Connecting rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0019] like Figure 1 As shown, this application provides a sodium chloride separation system for phorate synthesis wastewater, comprising: a distillation column 1, a treatment vessel 2, a filter 3, and an evaporator 4 connected in sequence; The inlet of distillation column 1 is connected to acidified raw water tank 110. The top outlet of distillation column 1 is connected to methanol tank 130 through condenser 120. The bottom outlet of distillation column 1 is connected to treatment vessel 2. The inlet of treatment vessel 2 is also connected to alkali tank 201 and activated carbon tank 202. The outlet of treatment vessel 2 is connected in sequence to filter 3, evaporator 4 and sodium chloride collection tank 5.

[0020] Specifically, in this application, the acidified wastewater obtained during the synthesis of phorate is temporarily stored in the acidified raw water tank 110. The wastewater is then pumped to the distillation column 1 for distillation, where methanol is separated. Gaseous methanol is obtained at the top of the distillation column 1, condensed into liquid methanol by the condenser 120, and stored in the methanol tank 130. This liquid methanol is then returned to the synthesis process for reuse, avoiding methanol waste. The methanol-free wastewater is then discharged from the bottom outlet of the distillation column 1 and transported to the treatment vessel 2 for further treatment. The inlet of the treatment vessel 2 is connected to an alkali tank 201 and an activated carbon tank 202. Activated carbon is supplied to the treatment vessel 2 through the activated carbon tank 202, and alkali solution is supplied to the treatment vessel 2 through the alkali tank 201. Activated carbon has a strong adsorption capacity, capable of adsorbing COD from the wastewater and decolorizing it. This ensures that the solid sodium chloride obtained after subsequent wastewater evaporation is clean and colorless, improving the quality of the recovered sodium chloride. Wastewater contains a lot of acid. Adding alkali can neutralize the acid in the wastewater, reducing the corrosion of equipment. At the same time, the alkali reacts with the acid in the wastewater to produce sodium chloride, which not only adjusts the pH value of the wastewater, but also converts a large amount of acid in the wastewater into sodium chloride, improving the recovery efficiency of usable components in the wastewater and increasing the amount of sodium chloride recovered.

[0021] A pH detector is installed in the treatment vessel 2 to detect the pH value of the wastewater in the treatment vessel 2 in real time. When the pH value of the wastewater is neutral (such as pH value 7-7.5) and the wastewater is colorless, the wastewater conditioning is completed. The wastewater in the treatment vessel 2 is then sent to the filter 3 to filter out the activated carbon and other solid impurities in the wastewater. The resulting colorless liquid is sent to the evaporator 4 for evaporation, and finally sodium chloride solid is obtained and stored in the sodium chloride collection tank 5. It can be used or sold externally, which improves the economic efficiency of the factory and avoids resource waste.

[0022] Among them, filter 3 is selected from plate and frame filter, and evaporator 4 is selected from MVR evaporator.

[0023] This application achieves wastewater treatment and the recovery of sodium chloride and methanol through the above-described scheme. First, the acidified wastewater is distilled in a distillation column to separate and store the methanol. Then, the methanol-free wastewater is transferred to a treatment vessel for conditioning. Activated carbon is supplied to the treatment vessel through an activated carbon tank, and alkali solution is supplied through an alkali solution tank. The activated carbon adsorbs COD from the wastewater and decolorizes it, improving the quality of the recovered sodium chloride. The alkali solution neutralizes the acid in the wastewater, further generating sodium chloride, thus improving the recovery efficiency and quantity. Finally, the wastewater is filtered and evaporated in an evaporator to obtain solid sodium chloride. This method avoids the high cost and safety risks associated with the large-scale use of hydrogen peroxide in existing technologies, while simultaneously improving the sodium chloride recovery efficiency.

[0024] like Figure 2As shown, optionally, the processing vessel 2 is equipped with a stirring device, including: The motor 210, connecting rod 220, first gear 230, second gear 240, rotating shaft 250, and stirring tube 260 are provided. The output end of the motor 210 is connected to one end of the connecting rod 220. The first gear 230 is fixedly sleeved on the outer circumference of the connecting rod 220. The rotating shaft 250 extends vertically into the processing vessel 2. The second gear 240 is sleeved on the rotating shaft 250 outside the processing vessel 2. The first gear 230 and the second gear 240 are meshed and connected. The stirring tube 260 is located on the outer circumference of the rotating shaft 250.

[0025] Specifically, by setting up a stirring device, the wastewater is stirred when mixed with activated carbon and alkaline solution in the treatment vessel 2, which improves the mixing uniformity of activated carbon, alkaline solution and wastewater, thereby improving the adsorption of COD in the wastewater. At the same time, it helps to improve the reaction efficiency of acid and alkaline solution in wastewater, and improve the yield and quality of sodium chloride.

[0026] During implementation, the starter motor 210 provides power, the motor 210 drives the connecting rod 220 to rotate, the connecting rod 220 drives the first gear 230 to rotate, the first gear 230 drives the second gear 240 that meshes with it to rotate, thereby causing the rotating shaft 250 and the stirring tube 260 to rotate, achieving the stirring effect on the wastewater.

[0027] like Figure 2 As shown, optionally, the stirring device also includes an airflow stirring unit: The airflow mixing unit includes a high-pressure air pump 610, an air supply pipe 620, and a rotary joint 630 connected in sequence. The end of the rotary joint 630 away from the air supply pipe 620 is connected to the top of the rotating shaft 250. Multiple aeration heads 640 are connected to the stirring tube 260; Both the rotating shaft 250 and the stirring tube 260 are hollow structures.

[0028] Specifically, the airflow mixing unit can further improve the mixing efficiency of wastewater with activated carbon and alkaline solution. A high-pressure air pump 610 provides high-pressure air or high-pressure inert gas, which sequentially passes through an air supply pipe 620, a rotary joint 630, and a mixing tube 260, finally entering the wastewater through multiple aeration heads 640. Since the gas output from the aeration heads 640 has a certain pressure and power, it can agitate the wastewater. Simultaneously, the rotating mixing tube 260 further improves the mixing efficiency of wastewater with activated carbon and alkaline solution.

[0029] Meanwhile, the airflow stirring unit can assist mechanical stirring, thereby reducing the output power of the motor 210 and reducing energy consumption during use. At the same time, during the stirring process, the rising, breaking and agitation of bubbles in the airflow stirring unit will create turbulence in the wastewater, thereby promoting mixing. Compared with mechanical stirring, it has the advantages of gentle and uniform mixing, and reduces the breakage of activated carbon during the stirring process.

[0030] like Figure 3 As shown, optionally, the airflow stirring unit also includes a lifting structure, which includes: a telescopic pipe 710, a gas supply branch pipe 720, an annular gas supply pipe 730, a hydraulic telescopic rod 740, and a connecting rod 750. The two ends of the telescopic pipe 710 are respectively connected to the gas supply pipe 620 and the gas supply branch pipe 720. The gas supply branch pipe 720 extends vertically into the treatment vessel 2, and the end of the gas supply branch pipe 720 located in the treatment vessel 2 is connected to the annular gas supply pipe 730. Multiple aeration heads 640 are connected to the annular gas supply pipe 730. The hydraulic telescopic rod 740 is fixedly installed on the top of the processing vessel 2 by a bracket. The fixed end of the hydraulic telescopic rod 740 is fixedly connected to the bracket, and the telescopic end of the hydraulic telescopic rod 740 is fixedly connected to the gas transmission pipe 720 through a connecting rod 750.

[0031] Specifically, one end of the telescopic pipe 710 is connected to the gas supply pipe 620, and the other end is connected to the gas supply branch pipe 720. The gas supply branch pipe 720 extends vertically into the treatment vessel 2 and is connected to the annular gas supply pipe 730. Through the extension and retraction of the hydraulic telescopic rod 740, the gas supply branch pipe 720 is driven to move up and down. At the same time, the annular gas supply pipe 730 also moves up and down. Together with the stirring device, during the gas flow stirring process, the upper, middle and lower parts of the wastewater in the treatment vessel 2 can be uniformly stirred, further improving the adsorption of impurities in the wastewater by activated carbon, improving the reaction of acid and alkali in the wastewater, and thus improving the wastewater treatment efficiency.

[0032] Furthermore, a bidirectional anti-fall self-locking pulley is connected to one end of the annular gas supply pipe 730 and the gas supply branch pipe 720 that are symmetrical about the center. The bidirectional anti-fall self-locking pulley is located at the top of the processing vessel 2 to prevent the annular gas supply pipe 730 from tilting during the lifting and lowering process.

[0033] Furthermore, a positioning rod is fixedly installed on the top or ground of the processing vessel 2. The telescopic end of the hydraulic telescopic rod 740 is slidably connected to the positioning rod to prevent the hydraulic telescopic rod 740 from deviating in direction during telescopic movement, ensuring that the annular gas delivery pipe 730 moves vertically up and down. Optionally, the aeration heads 640 on the stirring tube 260 and the annular air supply tube 730 each include: an aeration head 640 for upward air jetting, an aeration head 640 for downward air jetting, and an aeration head 640 for side air jetting.

[0034] Specifically, the air outlets of the aeration head 640 are tilted in different directions, which can spray airflow in different directions inside the treatment vessel 2, which is beneficial to improving the mixing effect of wastewater.

[0035] Optionally, the angle between the stirring tube 260 and the rotating shaft 250 is 45-120°, which is beneficial to improving the stirring effect.

[0036] Optionally, a pressure regulating valve 270 is provided on the top of the processing vessel 2.

[0037] Specifically, by adjusting the opening of the pressure regulating valve 270, the pressure inside the processing vessel 2 is adjusted to be the same as the atmospheric pressure, thus preventing high pressure from being generated in the processing vessel 2.

[0038] The technical solution of this application will be illustrated in detail below with specific embodiments.

[0039] The operation flow of the sodium chloride separation system in the phoxim synthesis wastewater in this embodiment is as follows: Distillation process: Acidified wastewater is pumped to distillation column 1 by a wastewater pump for distillation. Methanol is separated from the wastewater first. Gas methanol is obtained at the top of distillation column 1, which is condensed into liquid methanol by condenser 120 and stored in methanol tank 130.

[0040] Wastewater conditioning process: The methanol-removed wastewater is discharged from the bottom outlet of distillation column 1 and transported to treatment vessel 2 for treatment. The inlet of treatment vessel 2 is connected to alkali tank 201 and activated carbon tank 202. Activated carbon is transported to treatment vessel 2 through activated carbon tank 202, and alkali solution is transported to treatment vessel 2 through alkali tank 201. Activated carbon can adsorb COD in wastewater and decolorize wastewater. Alkali solution can neutralize acid in wastewater to generate sodium chloride, which not only adjusts the pH value of wastewater, but also converts a large amount of acid in wastewater into sodium chloride.

[0041] Simultaneously, the motor 210 and the high-pressure air pump 610 are started. The motor 210 drives the connecting rod 220 to rotate, which in turn drives the first gear 230 to rotate. The first gear 230 drives the second gear 240, which meshes with it, to rotate, thereby causing the rotating shaft 250 and the stirring tube 260 to rotate, achieving the effect of stirring the wastewater. The high-pressure air pump 610 provides high-pressure air or high-pressure inert gas. Part of the airflow passes through the air supply pipe 620, the rotary joint 630, and the stirring tube 260 in sequence, and finally enters the wastewater through multiple aeration heads 640. The other part passes through the telescopic pipe 710, the air supply branch pipe 720, the annular air supply pipe 730, and the aeration heads 640 in sequence to enter the wastewater. At the same time, the hydraulic telescopic rod 740 is activated to realize the vertical raising and lowering of the annular air supply pipe 730.

[0042] When the pH value of the wastewater is neutral (e.g., pH value 7-7.5) and the wastewater is colorless, the wastewater conditioning is complete. Then, turn off the motor 210, the high-pressure air pump 610 and the hydraulic telescopic rod 740, and transfer the wastewater in the treatment vessel 2 to the filter 3 to filter out the activated carbon and other solid impurities in the wastewater. The resulting colorless liquid is then transferred to the evaporator 4 for evaporation, finally yielding solid sodium chloride, which is stored in the sodium chloride collection tank 5 for use or sale.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A system for separating sodium chloride from phoxim synthesis wastewater, characterized in that, include: The distillation column (1), the processing vessel (2), the filter (3) and the evaporator (4) are connected in sequence. The inlet of the distillation column (1) is connected to the acidified raw water tank (110). The top outlet of the distillation column (1) is connected to the methanol tank (130) through the condenser (120). The bottom outlet of the distillation column (1) is connected to the treatment vessel (2). The inlet of the treatment vessel (2) is also connected to the alkali tank (201) and the activated carbon tank (202). The outlet of the treatment vessel (2) is connected in sequence to the filter (3), the evaporator (4) and the sodium chloride collection tank (5).

2. The sodium chloride separation system for phoxim synthesis wastewater according to claim 1, characterized in that, The processing vessel (2) is equipped with a stirring device, including: The components include a motor (210), a connecting rod (220), a first gear (230), a second gear (240), a rotating shaft (250), and a stirring tube (260). The output end of the motor (210) is connected to one end of the connecting rod (220). The first gear (230) is fixedly sleeved on the outer circumference of the connecting rod (220). The rotating shaft (250) extends vertically into the processing vessel (2). The second gear (240) is sleeved on the rotating shaft (250) at a position outside the processing vessel (2). The first gear (230) and the second gear (240) are meshed and connected. The stirring tube (260) is located on the outer circumference of the rotating shaft (250).

3. The sodium chloride separation system for phoxim synthesis wastewater according to claim 2, characterized in that, The stirring device also includes an airflow stirring unit: The airflow stirring unit includes a high-pressure air pump (610), an air supply pipe (620), and a rotary joint (630) connected in sequence. The end of the rotary joint (630) away from the air supply pipe (620) is connected to the top of the rotating shaft (250). Multiple aeration heads (640) are connected to the stirring tube (260). Both the rotating shaft (250) and the stirring tube (260) are hollow structures.

4. The sodium chloride separation system for phoxim synthesis wastewater according to claim 3, characterized in that, The airflow stirring unit also includes a lifting structure, which includes: a telescopic pipe (710), a gas distribution pipe (720), an annular gas distribution pipe (730), a hydraulic telescopic rod (740), and a connecting rod (750). The two ends of the telescopic pipe (710) are respectively connected to the gas distribution pipe (620) and the gas distribution pipe (720). The gas distribution pipe (720) extends vertically into the treatment vessel (2), and the end of the gas distribution pipe (720) located in the treatment vessel (2) is connected to the annular gas distribution pipe (730). Multiple aeration heads (640) are connected to the annular gas distribution pipe (730). The hydraulic telescopic rod (740) is fixedly mounted on the top of the processing vessel (2) by a bracket. The fixed end of the hydraulic telescopic rod (740) is fixedly connected to the bracket, and the telescopic end of the hydraulic telescopic rod (740) is fixedly connected to the gas transmission pipe (720) through the connecting rod (750).

5. The sodium chloride separation system for phoxim synthesis wastewater according to claim 4, characterized in that, The aeration heads (640) on the stirring tube (260) and the annular air supply tube (730) each include: an aeration head (640) for upward air jetting, an aeration head (640) for downward air jetting, and an aeration head (640) for side air jetting.

6. The sodium chloride separation system for phoxim synthesis wastewater according to claim 3, characterized in that, The angle between the stirring tube (260) and the rotating shaft (250) is 45-120°.

7. The sodium chloride separation system for phorate synthesis wastewater according to any one of claims 1-6, characterized in that, A pressure regulating valve (270) is provided on the top of the processing vessel (2).

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