Continuous crystallization production device for tetramethylpiperidinol

Abstract

The utility model relates to a continuous crystallization production device for tetramethylpiperidinol. The continuous crystallization production device comprises a raw material buffer tank, two sets of 22.5 m < 3 > crystallization kettles and two sets of constant temperature systems, the crystallization kettle is provided with a jacket; a feed port of the crystallization kettle is connected with a raw material buffer tank through a feed pipeline, a feed pump, a pneumatic V-shaped regulating valve and an electromagnetic flowmeter are arranged on the feed pipeline, a discharge port of the 1 # crystallization kettle is connected with the 2 # crystallization kettle through a discharge pipeline, and a discharge port of the 2 # crystallization kettle is connected with a centrifugal machine through a discharge pipeline; the constant-temperature system comprises a constant-temperature water tank, three heat exchangers and a constant-temperature water pump, a constant-temperature water inlet is connected with a jacket water inlet of the crystallizer, a jacket water outlet is connected with an upper connector of the constant-temperature water tank, water temperature control is achieved through a pneumatic v-shaped adjusting valve in front of the heat exchangers, scaling in the crystallization process can be avoided, and production efficiency is improved. And stable operation of continuous crystallization production of tetramethylpiperidinol is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of light stabilizer production, and specifically relates to a tetramethyl piperidine alcohol continuous crystallization production device. Background Art

[0002] When contacting the light stabilizer manufacturers, we found that the crystallization process of material purification and separation by cooling is basically intermittent and completed in batches. The two auxiliary links of feeding and discharging take up a considerable time in the entire operation cycle, resulting in low equipment utilization rate, high investment cost, low production capacity, a large number of crystallization equipment and a large area occupied. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a tetramethyl piperidine alcohol continuous crystallization production device. The crystallization device has two 22.5 cubic crystallizers connected in series, stage cooling, and an annual output of ≥5000 tons. The utility model solves the problems of long single-pot crystallization time, low production capacity, large number of crystallization equipment and large floor space in the production process of tetramethyl piperidine alcohol in the prior art.

[0004] In order to solve the above problems, the technical solution of the utility model is: a tetramethyl piperidine alcohol continuous crystallization production device, comprising:

[0005] Raw material buffer tank, the raw material buffer tank is jacketed, the raw material buffer tank is provided with a water inlet and a water outlet connected to a heat transfer device, a regulating valve is installed on the water inlet, the water inlet is connected to the hot water tank in the plant area to ensure that the inlet water temperature is greater than or equal to 65°C, a first liquid level gauge is arranged on the raw material buffer tank, the liquid level gauge is provided with high and low liquid level alarms, a first pressure transmitter and a first temperature transmitter, which are used to monitor the liquid level and pressure of the material in the raw material buffer tank, the liquid temperature in the raw material buffer tank is: 68°C-75°C; the raw material buffer tank is equipped with a stirrer, and an electric switch valve is installed at the bottom.

[0006] The feed pipeline includes: a magnetic pump, manual ball valves installed before and after the pump (mainly used for maintenance of the pump), a pressure gauge installed after the pump, and a pneumatic first V-type regulating valve and an electromagnetic flowmeter installed after the manual ball valve after the pump. The pneumatic V-type regulating valve and the electromagnetic flowmeter are interlocked through PLC, and the material flow rate is controlled by adjusting the valve opening.

[0007] 1# crystallizer, 1# crystallizer is equipped with a jacket, the jacket is connected to the constant temperature system, the second liquid level gauge and the second pressure transmitter are installed on the upper head of 1# crystallizer, the first thermocouple is installed on the side, and the first electric switch valve is installed on the bottom;

[0008] The 1# constant temperature system includes: a first constant temperature water tank, a first circulating water heat exchanger, a first cooling water heat exchanger, a first steam heat exchanger and a first constant temperature water pump, and a first electric shut-off valve is installed behind the constant temperature water pump; a second temperature transmitter is installed on the first constant temperature water tank, the first steam heat exchanger is connected to the steam source through a steam delivery pipeline, a second pneumatic V-type regulating valve is arranged on the steam delivery pipeline, and a first steam trap is arranged on the outlet pipe of the steam heat exchanger; the lower water outlet of the first constant temperature water tank is connected to the first constant temperature water pump through the water tank outlet pipe, and the upper water return port of the constant temperature water tank is connected to the outlet of the 1# crystallizer through the inlet and outlet water pipes of the first steam heat exchanger.

[0009] The 1# crystallizer is connected to the 2# crystallizer through the second discharge pipeline, on which the first interstage pump, the third pneumatic V-type regulating valve and the first electromagnetic flowmeter are installed, and the second discharge pipeline is connected to the second reflux pipeline. A part of the material is transported to the 2# crystallizer according to the set flow rate through the first interstage pump, and the rest of the material returns to the 1# crystallizer through the reflux pipeline.

[0010] 2# crystallizer, 2# crystallizer with a jacket, the jacket is connected to the constant temperature system, the third liquid level gauge and the third pressure transmitter are installed on the upper head of 2# crystallizer, the second thermocouple is installed on the side, and the second electric switch valve is installed on the bottom. The pipeline after the second electric switch valve is installed on the bottom is connected to the second interstage pump through a flange, and the pipeline after the pump is divided into two parts through a tee, one part is connected to the discharge pipeline to the centrifuge, and the other part is connected to the first reflux pipeline and connected to 2# crystallizer. The discharge pipeline is installed with a fourth pneumatic V-type regulating valve and a second electromagnetic flowmeter, and the reflux pipeline is installed with a manual regulating valve. Part of the material is transported to the centrifuge according to the set flow rate through the second interstage pump, and the remaining material returns to 2# crystallizer through the reflux pipeline.

[0011] The 2# constant temperature system includes: a second constant temperature water tank, a second circulating water heat exchanger, a second cooling water heat exchanger, a second steam heat exchanger and a second constant temperature water pump, a second electric shut-off valve is installed behind the second constant temperature water pump; a third temperature transmitter and a fourth liquid level gauge are installed on the second constant temperature water tank, the second steam heat exchanger is connected to the steam source through a steam delivery pipeline, a fifth pneumatic V-type regulating valve is arranged on the steam delivery pipeline, and a second steam trap is arranged on the water outlet pipeline of the second steam heat exchanger; the lower water outlet of the second constant temperature water tank is connected to the second constant temperature water pump through the water tank outlet pipeline, and the upper water return port of the constant temperature water tank is connected to the water outlet of the 2# crystallizer through the inlet and outlet water pipelines of the second steam heat exchanger.

[0012] Optionally, a PLC control system is also included: the raw material buffer tank to the 1# crystallizer and the 1# crystallizer to the 2# crystallizer are connected through the PLC control system, and the magnetic pump, pneumatic V-type regulating valve, electromagnetic flowmeter, interstage pump, pneumatic V-type regulating valve, electromagnetic flowmeter are electrically connected to the PLC control system.

[0013] Optionally, it also includes:

[0014] Hot water is passed through the jacket of the raw material buffer tank, and the inlet water temperature is ≥65°C; during the continuous crystallization of tetramethylpiperidinol, the material temperature of the 1# crystallizer is maintained at 38°C-45°C, and the material temperature of the 2# crystallizer is maintained at 20°C-25°C.

[0015] The temperature difference between the water temperature in the first constant temperature water tank in the 1# constant temperature system and the material temperature in the 1# crystallizer is controlled at 5-8°C; the temperature difference between the water temperature in the second constant temperature water tank in the 2# constant temperature system and the material temperature in the 2# crystallizer is controlled at 5-10°C.

[0016] Furthermore, the raw material buffer tank, No. 1 crystallizer, and No. 2 crystallizer are filled with nitrogen for protection to prevent gas volatilization due to excessively high feed temperature during the crystallization process.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the tetramethylpiperidinol product production device of the utility model has two 22.5 cubic crystallizers with an annual output of 5,000 tons, occupies a small area, has a low investment cost, can produce continuously for 24 hours, and has an annual production capacity of >7,200 hours. Through PLC control, one-button start can be achieved, reducing on-site labor and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a connection diagram of the production device in the embodiment.

[0019] Figure numerals: 1, raw material buffer tank; 2, 1# crystallizer; 3, 2# crystallizer; 4, regulating valve; 5, first liquid level gauge; 6, first pressure transmitter; 7, first temperature transmitter; 8, electric switch valve; 9, first manual ball valve; 10, magnetic pump; 11, first pressure gauge; 12, second manual ball valve; 13, first pneumatic V-type regulating valve; 14, electromagnetic flowmeter; 15, second temperature transmitter; 16, first constant temperature water tank; 17, first constant temperature water pump; 18, first electric shut-off valve; 19, first circulating water exchange heat exchanger; 20, first cooling water heat exchanger; 21, temperature sensor; 22, first steam heat exchanger; 23, second pneumatic V-type regulating valve; 24, first steam trap; 25, first electric switch valve; 26, first thermocouple; 27, second liquid level gauge; 28, second pressure transmitter; 29, feed pipeline; 30, first interstage pump; 31, third pneumatic V-type regulating valve; 32, first manual regulating valve; 33, first electromagnetic flowmeter; 34, third pressure transmitter; 35, third liquid level gauge; 36, second electric switch Close valve; 37, second interstage pump; 38, fourth pneumatic V-type regulating valve; 39, second electromagnetic flowmeter; 40, second manual regulating valve; 41, first reflux pipeline; 42, second thermocouple; 43, first discharge pipeline; 44, centrifuge; 45, temperature transmitter; 46, second cooling water heat exchanger; 47, second circulating water heat exchanger; 48, electric switch valve; 49, constant temperature water pump; 50, second constant temperature water tank; 51, fourth liquid level gauge; 52, third temperature transmitter; 53, fifth pneumatic V-type regulating valve; 5 4. Second steam heat exchanger; 55. Second steam trap; 56. Second discharge pipeline; 57. Second return pipeline; 58. Steam delivery pipeline; 59-1. First water outlet pipeline; 59-2. Second water outlet pipeline; 60-1. First circulating water inlet; 60-2. Second circulating water inlet; 61-1. First circulating water return; 61-1. Second circulating water return; 62-1. First cooling water inlet; 62-2. Second cooling water inlet; 63-1. First cooling water return; 63-2. Second cooling water return. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] A raw material buffer tank (1) is provided with a jacket. The raw material buffer tank (1) is provided with a water inlet and a water outlet connected to a heat transfer device. A regulating valve (4) is installed on the water inlet. The water inlet is connected to a hot water tank in a factory area to ensure that the water inlet temperature is greater than or equal to 65°C. A liquid level gauge (5) is provided on the raw material buffer tank (1). The liquid level gauge is provided with high and low liquid level alarms, a pressure transmitter (6) and a first temperature transmitter (7) for monitoring the liquid level and pressure of the material in the raw material buffer tank (1). The liquid temperature in the raw material buffer tank is 68°C-75°C. The raw material buffer tank (1) is stirred, and an electric switch valve (8) is installed at the bottom.

[0022] The feed pipeline (29) comprises a magnetic pump (10), first and second manual ball valves (9, 12) respectively installed before and after the pump, a first pressure gauge (11) installed after the pump, and a first pneumatic V-type regulating valve (13) and a pressure gauge (14) installed after the manual ball valve after the pump; the pneumatic V-type regulating valve and the electromagnetic flow meter are interlockedly controlled by PLC, and the material flow rate is controlled by adjusting the valve opening.

[0023] The 1# crystallizer (2) is provided with a jacket, the jacket is connected to a constant temperature system, a second liquid level gauge (27) and a pressure transmitter (28) are installed on the upper head of the 1# crystallizer (2), a first thermocouple (26) is installed on the side, and a first electric switch valve (25) is installed on the bottom.

[0024] The 1# constant temperature system comprises: a first constant temperature water tank (16), a first circulating water heat exchanger (19), a first cooling water heat exchanger (20), a first steam heat exchanger (22) and a first constant temperature water pump (17), wherein a first electric shut-off valve (18) is installed behind the first constant temperature water pump (17); a second temperature transmitter (15) is installed on the first constant temperature water tank (16), the first steam heat exchanger (22) is connected to a steam source via a steam delivery pipeline (58), a second pneumatic V-type regulating valve (23) is arranged on the steam delivery pipeline, and a first steam trap (24) is arranged on the first water outlet pipeline (59-1); the lower water outlet of the first constant temperature water tank (16) is connected to the first constant temperature water pump (17) via the water tank outlet pipeline, and the upper water return port of the first constant temperature water tank (16) is connected to the water outlet of the 1# crystallizer (2) via the water inlet and outlet pipelines of the first steam heat exchanger (22).

[0025] The 1# crystallizer (2) and the 2# crystallizer (3) are connected via a second discharge pipeline (56), on which an interstage pump (30), a third pneumatic V-type regulating valve (31) and a first electromagnetic flowmeter (33) are installed. The second discharge pipeline (56) is connected to a second return pipeline (57). A portion of the material is transported to the 2# crystallizer (3) at a set flow rate through the interstage pump, and the remaining material is returned to the 1# crystallizer (1) through the return pipeline.

[0026] A 2# crystallizer (3), the 2# crystallizer (3) is provided with a jacket, the jacket is connected to a constant temperature system, a liquid level gauge (35) and a pressure transmitter (34) are installed on the upper end cover of the 2# crystallizer (3), a second thermocouple (42) is installed on the side, and a second electric switch valve (36) is installed on the bottom. The pipeline after the second electric switch valve (36) is installed on the bottom is connected to the interstage pump (37) through a flange, and the pipeline after the pump is divided into two parts through a tee, one part is connected to the first discharge pipeline (43) to the centrifuge, and the other part is connected to the first reflux pipeline (41) and connected to the 2# crystallizer (3), the first discharge pipeline (43) is installed with a fourth pneumatic V-shaped regulating valve (38) and a second electromagnetic flowmeter (39), and the reflux pipeline is installed with a manual regulating valve (40); a part of the material is transported to the centrifuge according to a set flow rate through the interstage pump (37), and the rest of the material returns to the 2# crystallizer (3) through the reflux pipeline.

[0027] The 2# constant temperature system comprises: a second constant temperature water tank (50), a second circulating water heat exchanger (47), a second cooling water heat exchanger (46), a second steam heat exchanger (54) and a second constant temperature water pump (49). A second electric shut-off valve (48) is installed behind the second constant temperature water pump (49). A third temperature transmitter (52) and a liquid level meter (51) are installed on the second constant temperature water tank (50). The second steam heat exchanger (54) is connected to the second constant temperature water tank (50) through a steam delivery pipeline ( 58) is connected to the steam source, a fifth pneumatic V-type regulating valve (53) is arranged on the steam delivery pipeline, and a second steam trap (55) is arranged on the second water outlet pipeline (59-2); the lower water outlet of the second constant temperature water tank (50) is connected to the second constant temperature water pump (49) through the water tank outlet pipeline, and the upper water return port of the second constant temperature water tank (50) is connected to the water outlet of the 2# crystallizer (32) through the water inlet and outlet pipelines of the second steam heat exchanger (54).

[0028] Optionally, a PLC control system is also included: from the raw material buffer tank (1) to the No. 1 crystallizer (2) and from the No. 1 crystallizer (2) to the No. 2 crystallizer (3) through the PLC control system, the magnetic pump (10), the first pneumatic V-type regulating valve (13), 14, the electromagnetic flowmeter (14), the interstage pump (30, 37), the pneumatic V-type regulating valve (31, 38), and the electromagnetic flowmeter (33, 39) are electrically connected to the PLC control system.

[0029] Optionally, it also includes:

[0030] Hot water is passed through the jacket of the raw material buffer tank (1), and the water inlet temperature is ≥65°C; during the continuous crystallization of tetramethylpiperidinol, the material temperature of the 1# crystallizer (2) is maintained at 38°C-45°C, and the material temperature of the 2# crystallizer (3) is maintained at 20°C-25°C.

[0031] The temperature difference between the water temperature in the constant temperature water tank (16) in the 1# constant temperature system and the material temperature in the 1# crystallizer (2) is controlled at 5-8°C; the temperature difference between the water temperature in the constant temperature water tank (50) in the 2# constant temperature system and the material temperature in the 2# crystallizer (3) is controlled at 5-10°C.

[0032] Furthermore, the raw material buffer tank (1), the No. 1 crystallizer (2), and the No. 2 crystallizer (3) are filled with nitrogen for protection to prevent the feed temperature from being too high and gas volatilization during the crystallization process.

[0033] The operating process of the tetramethyl piperidine alcohol product production device of the present embodiment is as follows:

[0034] 1. Open the hot water inlet valve of the jacket of the raw material buffer tank (1) and preheat the buffer tank. When the temperature transmitter on the side of the buffer tank shows a temperature >50°C, quickly fill the buffer tank with raw materials and set the liquid level high and low alarms. The high level is 4000mm-4100mm and the low level is 2000mm-2200mm. When the liquid is at a low level, the material liquid temperature is >68°C. The hot water inlet valve of the jacket of the raw material buffer tank (1) is interlocked with the temperature transmitter on the side of the buffer tank (1). When the liquid temperature in the tank is >75°C, close the inlet valve. When the liquid temperature in the tank is 67°C, open the hot water inlet valve of the jacket of the raw material buffer tank (1).

[0035] 2. After the first and second thermostatic water tanks (16, 50) are filled with water, the valves and electric valves before and after the first and second thermostatic water pumps (17, 49) are opened, and the first and second thermostatic water pumps (17, 49) are turned on at the same time to ensure that the jackets of the No. 1 crystallizer (2) and the No. 2 crystallizer (3) are filled with water, and the water at the jacket outlet flows back into the thermostatic water tank.

[0036] 3. Preheat the jacket water temperature of the 1# crystallizer (2) and the 2# crystallizer (3), slowly open the second and fifth pneumatic V-type regulating valves (23, 53) at the inlet of the first and second steam heat exchangers (22, 54), open 1% every 1s until the maximum opening is 100%, observe the temperature sensor and temperature transmitter (21, 45), and when the jacket water temperature rises to 60°C, close the second and fifth pneumatic V-type regulating valves (23, 53).

[0037] 4. Preheat the feed pipeline (29). The feed pipeline is made into a jacketed pipe, and hot water is passed through the pipe. The water temperature is ≥68°C.

[0038] 5. Open the electric switch valve (8) at the bottom of the raw material buffer tank (1), open all valves on the feed pipeline (29) and start the magnetic pump (10), and quickly fill the 1# crystallizer and the 2# crystallizer. After filling, the first and second thermocouples (26, 42) show that the material temperature is 68°C.

[0039] 6. Close the electric switch valve (8) at the bottom of the raw material buffer tank (1), and at the same time, close the magnetic pump (10).

[0040] 7. Turn on the constant temperature system to cool the material in the 1# crystallizer to 40°C. When the cooling stops, the temperature of the temperature sensor (21) is 32°C. The material in the 2# crystallizer is cooled to 20°C. When the cooling stops, the temperature of the temperature transmitter (45) is 10°C.

[0041] 8. High and low liquid level alarms are set for 1# crystallizer (2) and 2# crystallizer (3), with the high liquid level at 4200mm and the low liquid level at 4100mm.

[0042] 9. Open the electric switch valve (8) at the bottom of the raw material buffer tank (1), start the magnetic pump (10), adjust the valve opening of the first pneumatic V-type regulating valve (13), and interlock control with the electromagnetic flow meter (14). The feed volume is 2.2m 3 / h-3m 3 / h.

[0043] 10. Open the first and second electric switch valves (25, 36) at the bottom of the 1# crystallizer (2) and the 2# crystallizer (3) in sequence, open the third and fourth pneumatic V-type regulating valves (31, 38) and the first and second manual regulating valves (32, 40), start the first and second interstage pumps (30, 37), the third and fourth pneumatic V-type regulating valves (31, 38) and the first and second electromagnetic flowmeters (33, 39) under PLC control, and control the discharge flow rate to 2.2 m3 by adjusting the first and second pneumatic V-type regulating valves (31, 38). 3 / h-3m 3 / h.

[0044] 11. The 2# crystallizer continuously discharges material to the centrifuge through the first discharge pipeline (43).

Claims

1. A tetramethyl piperidine alcohol continuous crystallization production device, characterized in that it comprises: A raw material buffer tank (1) is provided with a jacket. The raw material buffer tank (1) is provided with a water inlet and a water outlet connected to a heat transfer device. A regulating valve (4) is installed on the water inlet. The raw material buffer tank (1) is provided with a first liquid level gauge (5), a first pressure transmitter (6) and a first temperature transmitter (7) for monitoring the liquid level and pressure of the material in the raw material buffer tank (1). The raw material buffer tank (1) is provided with a stirrer and an electric switch valve (8) is installed at the bottom. The feed pipeline (29) comprises a magnetic pump (10), first and second manual ball valves (9, 12) respectively installed before and after the pump, a first pressure gauge (11) installed after the pump, and a first pneumatic V-type regulating valve (13) and an electromagnetic flowmeter (14) installed after the manual ball valve after the pump. A 1# crystallizer (2), the 1# crystallizer (2) is provided with a jacket, the jacket is connected to a constant temperature system, a second liquid level gauge (27) and a second pressure transmitter (28) are installed on the upper head of the 1# crystallizer (2), a first thermocouple (26) is installed on the side, and a first electric switch valve (25) is installed on the bottom. 1# Constant temperature system includes: A first thermostatic water tank (16), a first circulating water heat exchanger (19), a first cooling water heat exchanger (20), a first steam heat exchanger (22) and a first thermostatic water pump (17), wherein a first electric shut-off valve (18) is installed behind the first thermostatic water pump (17); a second temperature transmitter (15) is installed on the first thermostatic water tank (16); the first steam heat exchanger (22) is connected to a steam source via a steam delivery pipeline (58); a second pneumatic V-type regulating valve (23) is arranged on the steam delivery pipeline; and a first steam trap (24) is arranged on the first water outlet pipeline (59-1); the lower water outlet of the first thermostatic water tank (16) is connected to the first thermostatic water pump (17) via the water tank outlet pipeline, and the upper water return port of the first thermostatic water tank (16) is connected to the water outlet of the No. 1 crystallizer (2) via the water inlet and outlet pipelines of the first steam heat exchanger (22). The 1# crystallizer (2) and the 2# crystallizer (3) are connected via a second discharge pipeline (56), on which a first interstage pump (30), a third pneumatic V-type regulating valve (31) and a first electromagnetic flowmeter (33) are installed. The second discharge pipeline (56) is connected to a second reflux pipeline (57). A 2# crystallizer (3), the 2# crystallizer (3) is provided with a jacket, the jacket is connected to a constant temperature system, a third liquid level gauge (35) and a third pressure transmitter (34) are installed on the upper end cover of the 2# crystallizer (3), a second thermocouple (42) is installed on the side, a second electric switch valve (36) is installed on the bottom, a pipeline after the second electric switch valve (36) is installed on the bottom is connected to a second interstage pump (37) through a flange, a pipeline after the pump is divided into two parts through a tee, one part is connected to a first discharge pipeline (43) to a centrifuge, and the other part is connected to a first reflux pipeline (41) and connected to the 2# crystallizer (3), a fourth pneumatic V-type regulating valve (38) and a second electromagnetic flowmeter (39) are installed on the first discharge pipeline (43), and a manual regulating valve (40) is installed on the reflux pipeline. 2# Constant temperature system includes: A second thermostatic water tank (50), a second circulating water heat exchanger (47), a second cooling water heat exchanger (46), a second steam heat exchanger (54) and a second thermostatic water pump (49); a second electric shut-off valve (48) is installed behind the second thermostatic water pump (49); a third temperature transmitter (52) and a fourth liquid level gauge (51) are installed on the second thermostatic water tank (50); the second steam heat exchanger (54) is connected to a steam source via a steam delivery pipeline (58); a fifth pneumatic V-type regulating valve (53) is arranged on the steam delivery pipeline; a second steam trap (55) is arranged on the second water outlet pipeline (59-2); a lower water outlet of the second thermostatic water tank (50) is connected to the second thermostatic water pump (49) via the water tank outlet pipeline; an upper water return port of the second thermostatic water tank (50) is connected to the water outlet of the second# crystallizer (32) via the water inlet and outlet pipelines of the second steam heat exchanger (54).

2. A tetramethyl piperidine alcohol continuous crystallization production device according to claim 1, characterized in that, from the raw material buffer tank (1) to the 1# crystallizer (2) and between the 1# crystallizer (2) and the 2# crystallizer (3), a magnetic pump (10), a first pneumatic V-type regulating valve (13), an electromagnetic flowmeter (14), the first and second interstage pumps (30, 37), the third and fourth pneumatic V-type regulating valves (31, 38), the first and second electromagnetic flowmeters (33, 39) are electrically connected to the PLC control system.

3. A tetramethyl piperidine alcohol continuous crystallization production device according to claim 1, characterized in that, Also includes: The jacket of the raw material buffer tank (1) is supplied with hot water, and the inlet water temperature is ≥65°C; During the continuous crystallization of tetramethylpiperidinol, the material temperature of the 1# crystallizer (2) is 38°C-45°C, and the material temperature of the 2# crystallizer (3) is 20°C-25°C.

4. A tetramethyl piperidine alcohol continuous crystallization production device according to claim 1, characterized in that, Also includes: The raw material buffer tank (1), the No. 1 crystallizer (2) and the No. 2 crystallizer (3) are filled with nitrogen for protection.

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