Continuous washing device for methyl p-tert-butylbenzoate

Abstract

The utility model relates to a continuous washing device for methyl p-tert-butylbenzoate, which belongs to the technical field of petrifaction and comprises a temporary storage tank, a first-stage washing device, a second-stage alkaline washing device, a third-stage alkaline washing device and a fourth-stage washing device which are sequentially connected through pipelines, and the bottom of the fourth-stage washing device is connected with an MBB crude product tank through a pipeline; an MBB esterification oil phase and washing water are conveyed to a washing kettle through a material transfer pump, oil and water overflow to a liquid separation tank after being mixed in the washing kettle and then are subjected to standing layering to overflow to a crude product tank, and continuous washing is achieved by adjusting the feeding and discharging flow of the washing kettle to a reasonable numerical value and circulating in sequence; compared with intermittent washing, continuous washing can eliminate the problems of incomplete mixed washing effect and waste of raw material sodium carbonate; meanwhile, the workload of staff is reduced, and operation errors are reduced.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a continuous washing device for methyl p-tert-butylbenzoate. Background Technology

[0002] Washing the oil phase of methyl p-tert-butylbenzoate during esterification is a core step in the post-synthesis treatment. Its purpose is to separate impurities in the oil phase (organic phase) through physicochemical methods, improve product purity, and realize industrial feasibility.

[0003] The existing washing process for producing methyl tert-butylbenzoate (MBB) is intermittent, resulting in incomplete washing and waste of raw material soda ash. The washing and water separation process requires visual operation by employees, which is labor-intensive and prone to operational errors, posing safety hazards. Utility Model Content

[0004] The purpose of this invention is to provide a continuous washing device for methyl tert-butylbenzoate to solve the problems mentioned in the background art.

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

[0006] A continuous washing device for methyl tert-butylbenzoate includes a temporary storage tank, a primary water washing device, a secondary alkaline washing device, a tertiary alkaline washing device, and a quaternary water washing device connected in sequence by pipes. The primary water washing device includes a primary washing kettle, a primary separating tank, a primary crude product tank, a primary conveying pipe, a tap water pipe, and a buffer tank. The bottom of the temporary storage tank is connected to one end of the primary conveying pipe via a transfer pump, and the other end of the primary conveying pipe is connected to the top of the primary washing kettle. The primary washing kettle, the primary separating tank, and the primary crude product tank are arranged in descending order and connected in sequence by an overflow pipe. The tap water pipe is connected to the primary conveying pipe. The buffer tank is connected to the bottom of the primary separating tank via a pipe, and the bottom of the buffer tank is connected to a sewage pipe via a transfer pump.

[0007] The secondary alkaline washing device includes a secondary feed pipe, a gas-liquid separator, an alkaline water pipe I, a secondary alkaline washing kettle, a secondary separation tank, a secondary crude product tank, a buffer tank II, and an alkaline water transfer tank. The bottom of the primary crude product tank is connected to one end of the secondary feed pipe via a transfer pump. The other end of the secondary feed pipe and the alkaline water pipe I are both connected to the top of the gas-liquid separator. The gas-liquid separator, the secondary alkaline washing kettle, the secondary separation tank, and the secondary crude product tank are arranged in descending order and connected in sequence via an overflow pipe. The buffer tank II is connected to the bottom of the secondary separation tank via a pipe, and the bottom of the buffer tank II is connected to the top of the alkaline water transfer tank via a pipe.

[0008] The three-stage alkaline washing device includes a three-stage conveying pipe, an alkaline water pipe II, a three-stage alkaline washing kettle, a three-stage separating tank, a three-stage crude product tank, and a three-stage alkaline water return pipe. The bottom of the two-stage crude product tank is connected to one end of the three-stage conveying pipe via a transfer pump, and the other end of the three-stage conveying pipe is connected to the top of the three-stage alkaline washing kettle. The alkaline water pipe II is connected to the three-stage conveying pipe. The three-stage alkaline washing kettle, the three-stage separating tank, and the three-stage crude product tank are arranged in descending order and connected in sequence via an overflow pipe. One end of the three-stage alkaline water return pipe is connected to the bottom of the three-stage separating tank via a transfer pump, and the other end is connected to the two-stage conveying pipe.

[0009] The four-stage washing device includes a four-stage feed pipe, a four-stage washing tank, a four-stage separating tank, a four-stage crude product tank, a second tap water pipe, and a four-stage washing water return pipe. The bottom of the third-stage crude product tank is connected to one end of the four-stage feed pipe via a transfer pump. The other end of the four-stage feed pipe and the second tap water pipe are both connected to the top of the four-stage washing tank. The four-stage washing tank, the four-stage separating tank, and the four-stage crude product tank are arranged in descending order and connected in sequence via an overflow pipe. One end of the four-stage washing water return pipe is connected to the bottom of the fourth-stage separating tank via a transfer pump, and the other end is connected to the first-stage feed pipe. The bottom of the fourth-stage crude product tank is connected to the MBB crude product tank via a pipe.

[0010] Preferably, the primary conveying pipe, the secondary conveying pipe, and the tertiary conveying pipe are all parallel double pipes connected at both ends. The first and fourth stage washing water return pipes are connected to one of the pipes of the primary conveying pipe, the tertiary alkaline water return pipe is connected to one of the pipes of the secondary conveying pipe, and the second alkaline water pipe is connected to one of the pipes of the tertiary conveying pipe.

[0011] Preferably, a solenoid valve and a flow meter are installed at one end of the primary conveying pipe connected to the temporary storage tank near the transfer pump, a raw material return pipe is connected to the primary conveying pipe between the transfer pump and the solenoid valve, and the other end of the raw material return pipe is connected to the top of the temporary storage tank.

[0012] Preferably, a solenoid valve and a flow meter are installed near the transfer pump at one end of the secondary conveying pipe connected to the primary crude product tank. A raw material return pipe is connected to the secondary conveying pipe between the transfer pump and the solenoid valve, and the other end of the raw material return pipe is connected to the top of the primary crude product tank.

[0013] Preferably, a solenoid valve and a flow meter are installed at one end of the tertiary conveying pipe connected to the secondary crude product tank near the transfer pump. A raw material return pipe is connected to the tertiary conveying pipe between the transfer pump and the solenoid valve. The other end of the raw material return pipe is connected to the top of the secondary crude product tank.

[0014] Preferably, a solenoid valve and a flow meter are installed near the transfer pump at one end of the fourth-stage conveying pipe connected to the third-stage crude product tank. A raw material return pipe is connected to the fourth-stage conveying pipe between the transfer pump and the solenoid valve. The other end of the raw material return pipe is connected to the top of the third-stage crude product tank.

[0015] Preferably, the overflow pipes of the primary water washing device, the secondary alkaline washing device, the tertiary alkaline washing device, and the quaternary water washing device are all equipped with solenoid valves; the primary washing tank, the secondary alkaline washing tank, the tertiary alkaline washing tank, and the quaternary washing tank are all equipped with level gauges, and each has a solenoid valve at its bottom.

[0016] Preferably, each of the following is equipped with a solenoid valve and a flow meter: tap water pipe one, tap water pipe two, alkaline water pipe one, alkaline water pipe two, tertiary alkaline water return pipe, and quaternary washing water return pipe. The solenoid valve, flow meter, and transfer pump are all electrically connected.

[0017] Preferably, the tops of the temporary storage tank, the primary washing tank, the secondary alkaline washing tank, the tertiary alkaline washing tank, and the quaternary washing tank are all connected to the nitrogen main pipe and the low-pressure steam main pipe.

[0018] Preferably, the tops of the temporary storage tank, primary washing tank, primary separating tank, primary crude product tank, gas-liquid separator, secondary alkaline washing tank, secondary separating tank, secondary crude product tank, tertiary alkaline washing tank, tertiary separating tank, tertiary crude product tank, quaternary washing tank, quaternary separating tank, and quaternary crude product tank are all connected to the exhaust gas main pipe.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention delivers the MBB esterification oil phase and washing water to the washing tank via a transfer pump. After the oil and water mix in the washing tank, the mixture overflows to a separatory tank, then settles and separates before overflowing to a crude product tank. By adjusting the inlet and outlet flow rates of the washing tank to appropriate values, this cycle is repeated to achieve continuous washing. Compared to intermittent washing, continuous washing can eliminate the problems of incomplete mixing and washing effects and waste of raw material soda ash. At the same time, it reduces the workload of employees and reduces operational errors. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the structure of this utility model.

[0022] Figure Labels

[0023] 1. Temporary storage tank; 2. Primary washing kettle; 3. Primary separating tank; 4. Primary crude product tank; 5. Buffer tank I; 6. Gas-liquid separator; 7. Secondary alkaline washing kettle; 8. Secondary separating tank; 9. Secondary crude product tank; 10. Buffer tank II; 11. Alkaline water transfer tank; 12. Tertiary alkaline washing kettle; 13. Tertiary separating tank; 14. Tertiary crude product tank; 15. Quaternary washing kettle; 16. Quaternary separating tank; 17. Quaternary crude product tank; 18. Transfer pump; 19. Raw material return pipe; 20. Primary conveying pipe; 21. Sewage pipe; 22. Tap water pipe I; 23. Secondary conveying pipe; 24. Alkaline water pipe I; 25. Alkaline water pipe II; 26. Tertiary alkaline water return pipe; 27. Tap water pipe II; 28. Quaternary washing water return pipe; 29. ​​Tertiary conveying pipe; 30. Quaternary conveying pipe. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] like Figure 1 As shown, a continuous washing device for methyl tert-butylbenzoate includes a temporary storage tank 1, a primary water washing device, a secondary alkaline washing device, a tertiary alkaline washing device, and a quaternary water washing device connected in sequence by pipelines.

[0026] The primary washing device includes a primary washing tank 2, a primary separating tank 3, a primary crude product tank 4, a primary conveying pipe 20, a tap water pipe 22, and a buffer tank 5. The bottom of the temporary storage tank 1 is connected to one end of the primary conveying pipe 20 via a transfer pump 18, and the other end of the primary conveying pipe 20 is connected to the top of the primary washing tank 2. The primary washing tank 2, the primary separating tank 3, and the primary crude product tank 4 are arranged in descending order and connected in sequence via an overflow pipe. The overflow pipe is equipped with a solenoid valve to ensure that the oil and water can overflow from high to low between the tanks after uniform mixing and stratification. The tap water pipe 22 is connected to the primary conveying pipe 20. The buffer tank 5 is connected to the bottom of the primary separating tank 3 via a pipe. The bottom of the buffer tank 5 is connected to the sewage pipe 21 via the transfer pump 18. The sewage pipe 21 is connected to the sewage treatment system pipeline for centralized discharge of the wastewater after washing.

[0027] The secondary alkaline washing unit includes a secondary feed pipe 23, a gas-liquid separator 6, an alkaline water pipe 24, a secondary alkaline washing kettle 7, a secondary separation tank 8, a secondary crude product tank 9, a second buffer tank 10, and an alkaline water transfer tank 11. The bottom of the primary crude product tank 4 is connected to one end of the secondary feed pipe 23 via a transfer pump 18. The other end of the secondary feed pipe 23 and the alkaline water pipe 24 are both connected to the top of the gas-liquid separator 6. The alkaline water and oil phase are mixed in the gas-liquid separator 6 and waste gas is removed. The gas-liquid separator 6, the secondary alkaline washing kettle 7, the secondary separation tank 8, and the secondary crude product tank 9 are arranged in descending order and connected in sequence via overflow pipes. The overflow pipes are equipped with solenoid valves to ensure that the oil and water can overflow from high to low between the tanks after uniform mixing and stratification. The second buffer tank 10 is connected to the bottom of the secondary separation tank 8 via a pipe. The bottom of the second buffer tank 10 is connected to the top of the alkaline water transfer tank 11 via a pipe, so that the washed alkaline water is temporarily stored in the transfer tank for recycling.

[0028] The three-stage alkaline washing device includes a three-stage feed pipe 29, an alkaline water pipe 25, a three-stage alkaline washing kettle 12, a three-stage separating tank 13, a three-stage crude product tank 14, and a three-stage alkaline water return pipe 26. The bottom of the two-stage crude product tank 9 is connected to one end of the three-stage feed pipe 29 via a transfer pump 18, and the other end of the three-stage feed pipe 29 is connected to the top of the three-stage alkaline washing kettle 12. The alkaline water pipe 25 is connected to the three-stage feed pipe 29. The three-stage alkaline washing kettle 12, the three-stage separating tank 13, and the three-stage crude product tank 14 are arranged in descending order and connected in descending order via an overflow pipe. The overflow pipe is equipped with a solenoid valve to ensure that the oil and water can overflow from high to low between the tanks after uniform mixing and stratification. One end of the three-stage alkaline water return pipe 26 is connected to the bottom of the three-stage separating tank 13 via a transfer pump 18, and the other end is connected to the two-stage feed pipe 23 to realize the recycling of alkaline water.

[0029] The four-stage washing device includes a four-stage feed pipe 30, a four-stage washing tank 15, a four-stage separating tank 16, a four-stage crude product tank 17, a second water supply pipe 27, and a four-stage washing water return pipe 28. The bottom of the third-stage crude product tank 14 is connected to one end of the four-stage feed pipe 30 via a transfer pump 18. The other end of the four-stage feed pipe 30 and the second water supply pipe 27 are both connected to the top of the four-stage washing tank 15. The four-stage washing tank 15, the fourth-stage separating tank 16, and the fourth-stage crude product tank 17 are arranged in descending order and connected in sequence via an overflow pipe. The overflow pipe is equipped with a solenoid valve to ensure that the oil and water can overflow from high to low between the tanks after uniform mixing and stratification. One end of the four-stage washing water return pipe 28 is connected to the bottom of the fourth-stage separating tank 16 via the transfer pump 18, and the other end is connected to the first-stage feed pipe 20 to realize the recycling of washing water. The bottom of the fourth-stage crude product tank 17 is connected to the MBB crude product tank via a pipe to complete continuous washing.

[0030] The primary conveying pipe 20, the secondary conveying pipe 23, and the tertiary conveying pipe 29 are all parallel double pipes connected at both ends. The tap water pipe 22 and the tertiary washing water return pipe 28 are connected to one of the pipes of the primary conveying pipe 20. The tertiary alkaline water return pipe 26 is connected to one of the pipes of the secondary conveying pipe 23. The alkaline water pipe 25 is connected to one of the pipes of the tertiary conveying pipe 29.

[0031] A solenoid valve and a flow meter are installed at one end of the primary feed pipe 20 connected to the temporary storage tank 1 near the transfer pump 18. A raw material return pipe 19 is connected to the primary feed pipe 20 between the transfer pump 18 and the solenoid valve. The other end of the raw material return pipe 19 is connected to the top of the temporary storage tank 1. The solenoid valve, the flow meter and the transfer pump 18 are electrically connected. When the liquid conveyed in the primary feed pipe 20 reaches the set value of the flow meter, the solenoid valve closes, allowing the excess liquid to be recovered into the temporary storage tank 1 through the transfer pump and the raw material return pipe 19.

[0032] A solenoid valve and a flow meter are installed at one end of the secondary conveying pipe 23, which is connected to the primary crude product tank 4, near the transfer pump 18. A raw material return pipe 19 is connected to the secondary conveying pipe 23 between the transfer pump 18 and the solenoid valve. The other end of the raw material return pipe 19 is connected to the top of the primary crude product tank 4. The solenoid valve, the flow meter, and the transfer pump 18 are electrically connected. When the liquid conveyed in the secondary conveying pipe 23 reaches the flow meter set value, the solenoid valve closes, allowing the excess liquid to be recovered into the primary crude product tank 4 through the raw material return pipe 19.

[0033] A solenoid valve and a flow meter are installed at one end of the tertiary feed pipe 29, which is connected to the secondary crude product tank 9, near the transfer pump 18. A raw material return pipe 19 is connected to the tertiary feed pipe 29 between the transfer pump 18 and the solenoid valve. The other end of the raw material return pipe 19 is connected to the top of the secondary crude product tank 9. The solenoid valve, the flow meter, and the transfer pump 18 are electrically connected. When the liquid conveyed in the tertiary feed pipe 29 reaches the flow meter set value, the solenoid valve closes, allowing the excess liquid to be recovered into the secondary crude product tank 9 through the raw material return pipe 19.

[0034] A solenoid valve and a flow meter are installed at one end of the fourth-stage conveying pipe 30, which is connected to the third-stage crude product tank 14, near the transfer pump 18. A raw material return pipe 19 is connected to the fourth-stage conveying pipe 30 between the transfer pump 18 and the solenoid valve. The other end of the raw material return pipe 19 is connected to the top of the third-stage crude product tank 14. The solenoid valve, the flow meter, and the transfer pump 18 are electrically connected. When the liquid conveyed in the fourth-stage conveying pipe 30 reaches the flow meter's set value, the solenoid valve closes, allowing excess liquid to be recovered into the third-stage crude product tank 14 through the raw material return pipe 19.

[0035] Level gauges are installed on the primary washing tank 2, the secondary alkaline washing tank 7, the tertiary alkaline washing tank 12, and the quaternary washing tank 15. Solenoid valves are installed at the bottom of each tank to facilitate the viewing of the liquid level and the discharge of liquid from the bottom of the tank.

[0036] Solenoid valves and flow meters are installed on water pipe 1 (22), water pipe 2 (27), alkaline water pipe 1 (24), alkaline water pipe 2 (25), tertiary alkaline water return pipe 26, and tertiary washing water return pipe 28. The solenoid valves, flow meters, and transfer pump 18 are all electrically connected to facilitate the control of the flow rate of each liquid.

[0037] The tops of the temporary storage tank 1, the primary washing vessel 2, the secondary alkaline washing vessel 7, the tertiary alkaline washing vessel 12, and the quaternary washing vessel 15 are all connected to the nitrogen main pipe and the low-pressure steam main pipe to provide the gas required for the washing reaction and ensure stability.

[0038] The tops of the temporary storage tank 1, primary washing tank 2, primary separation tank 3, primary crude product tank 4, gas-liquid separator 6, secondary alkaline washing tank 7, secondary separation tank 8, secondary crude product tank 9, tertiary alkaline washing tank 12, tertiary separation tank 13, tertiary crude product tank 14, quaternary washing tank 15, quaternary separation tank 16, and quaternary crude product tank 17 are all connected to the exhaust gas main pipe, through which the exhaust gas generated during washing is centrally treated in an environmentally friendly manner.

[0039] This invention delivers the MBB esterification oil phase and washing water to the washing tank via a transfer pump. After the oil and water mix in the washing tank, the mixture overflows to a separatory tank, then settles and separates before overflowing to a crude product tank. By adjusting the inlet and outlet flow rates of the washing tank to appropriate values, this cycle is repeated to achieve continuous washing. Compared to intermittent washing, continuous washing can eliminate the problems of incomplete mixing and washing effects and waste of raw material soda ash. At the same time, it reduces the workload of employees and reduces operational errors.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A continuous washing apparatus for methyl p-tert-butylbenzoate, characterized by: The device comprises a temporary storage tank, a first water washing device, a second alkali washing device, a third alkali washing device and a fourth water washing device connected in sequence through pipelines, the first water washing device comprises a first washing kettle, a first liquid separation tank, a first crude product tank, a first material conveying pipeline, a tap water pipeline and a buffer tank, the bottom of the temporary storage tank is connected with one end of the first material conveying pipeline through a material transfer pump, the other end of the first material conveying pipeline is connected with the top of the first washing kettle, the first washing kettle, the first liquid separation tank and the first crude product tank are arranged in sequence from high to low and are connected in sequence through overflow pipelines, the tap water pipeline is connected with the first material conveying pipeline, the buffer tank is connected with the bottom of the first liquid separation tank through a pipeline, and the bottom of the buffer tank is connected with a sewage pipeline through a material transfer pump; The second alkali washing device comprises a second material conveying pipeline, a gas-liquid separator, an alkali water pipeline, a second alkali washing kettle, a second liquid separation tank, a second crude product tank, a buffer tank and an alkali water transfer tank, the bottom of the first crude product tank is connected with one end of the second material conveying pipeline through a material transfer pump, the other end of the second material conveying pipeline and the alkali water pipeline are both connected with the top of the gas-liquid separator, the gas-liquid separator, the second alkali washing kettle, the second liquid separation tank and the second crude product tank are arranged in sequence from high to low and are connected in sequence through overflow pipelines, the buffer tank is connected with the bottom of the second liquid separation tank through a pipeline, and the bottom of the buffer tank is connected with the top of the alkali water transfer tank through a pipeline; The third alkali washing device comprises a third material conveying pipeline, an alkali water pipeline, a third alkali washing kettle, a third liquid separation tank, a third crude product tank and a third alkali water return pipeline, the bottom of the second crude product tank is connected with one end of the third material conveying pipeline through a material transfer pump, the other end of the third material conveying pipeline is connected with the top of the third alkali washing kettle, the alkali water pipeline is connected with the third material conveying pipeline, the third alkali washing kettle, the third liquid separation tank and the third crude product tank are arranged in sequence from high to low and are connected in sequence through overflow pipelines, one end of the third alkali water return pipeline is connected with the bottom of the third liquid separation tank through a material transfer pump, and the other end is connected with the second material conveying pipeline; The fourth water washing device comprises a fourth material conveying pipeline, a fourth washing kettle, a fourth liquid separation tank, a fourth crude product tank, a second tap water pipeline and a fourth washing water return pipeline, the bottom of the third crude product tank is connected with one end of the fourth material conveying pipeline through a material transfer pump, the other end of the fourth material conveying pipeline and the second tap water pipeline are both connected with the top of the fourth washing kettle, the fourth washing kettle, the fourth liquid separation tank and the fourth crude product tank are arranged in sequence from high to low and are connected in sequence through overflow pipelines, one end of the fourth washing water return pipeline is connected with the bottom of the fourth liquid separation tank through a material transfer pump, the other end is connected with the first material conveying pipeline, and the bottom of the fourth crude product tank is connected with an MBB crude product tank through a pipeline.

2. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 1, characterized in that: The first material conveying pipeline, the second material conveying pipeline and the third material conveying pipeline are parallel double pipelines connected at both ends, the first tap water pipeline and the fourth washing water return pipeline are connected with one of the pipelines of the first material conveying pipeline, the third alkali water return pipeline is connected with one of the pipelines of the second material conveying pipeline, and the second alkali water pipeline is connected with one of the pipelines of the third material conveying pipeline.

3. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 2, characterized in that: The end of the primary material conveying pipe connected with the temporary storage tank and close to the material transfer pump is provided with an electromagnetic valve and a flow meter, a raw material backflow pipe is connected to the primary material conveying pipe between the material transfer pump and the electromagnetic valve, and the other end of the raw material backflow pipe is connected with the top of the temporary storage tank.

4. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 3, characterized in that: The end of the secondary material conveying pipe connected with the primary crude product tank and close to the material transfer pump is provided with an electromagnetic valve and a flow meter, a raw material backflow pipe is connected to the secondary material conveying pipe between the material transfer pump and the electromagnetic valve, and the other end of the raw material backflow pipe is connected with the top of the primary crude product tank.

5. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 4, characterized in that: The end of the tertiary material conveying pipe connected with the secondary crude product tank and close to the material transfer pump is provided with an electromagnetic valve and a flow meter, a raw material backflow pipe is connected to the tertiary material conveying pipe between the material transfer pump and the electromagnetic valve, and the other end of the raw material backflow pipe is connected with the top of the secondary crude product tank.

6. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 5, characterized in that: The end of the quaternary material conveying pipe connected with the tertiary crude product tank and close to the material transfer pump is provided with an electromagnetic valve and a flow meter, a raw material backflow pipe is connected to the quaternary material conveying pipe between the material transfer pump and the electromagnetic valve, and the other end of the raw material backflow pipe is connected with the top of the tertiary crude product tank.

7. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 6, characterized in that: The overflow pipes of the first water washing device, the second alkali washing device, the third alkali washing device and the fourth water washing device are all provided with electromagnetic valves; the first washing kettle, the second alkali washing kettle, the third alkali washing kettle and the fourth washing kettle are all provided with liquid level meters and electromagnetic valves at the bottom.

8. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 7, characterized in that: The tap water pipe one, the tap water pipe two, the alkali water pipe one, the alkali water pipe two, the tertiary alkali water backflow pipe and the quaternary washing water backflow pipe are all provided with electromagnetic valves and flow meters, and the electromagnetic valves, the flow meters and the material transfer pump are all electrically connected.

9. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 1, characterized in that: The top of the temporary storage tank, the first washing kettle, the second alkali washing kettle, the third alkali washing kettle and the fourth washing kettle is connected with the nitrogen main pipe and the low-pressure steam main pipe.

10. A device for continuous washing of methyl p-tert-butylbenzoate according to claim 1, characterized in that: The top of the temporary storage tank, the first washing kettle, the first liquid separation tank, the primary crude product tank, the gas-liquid separator, the second alkali washing kettle, the second liquid separation tank, the secondary crude product tank, the third alkali washing kettle, the third liquid separation tank, the tertiary crude product tank, the fourth washing kettle, the fourth liquid separation tank and the quaternary crude product tank is connected with the waste gas main pipe.

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