Multi-mode intelligent reflux control system for distillation column reflux tank

Abstract

This utility model discloses a multi-mode intelligent reflux control system for a distillation column reflux tank, relating to the field of triethylamine production technology. It includes: a hydrochloride preparation vessel, a hydrochloride neutralization vessel, a crude ethylamine tank I, an ethylamine distillation zone, and a solution flash treatment zone. This utility model utilizes a liquid separator II in the crude ethylamine tank I to automatically separate the water deposited at the bottom of the tank into a sodium chloride dissolution storage tank. The crude triethylamine in the crude ethylamine tank I is then transported to the distillation column for distillation, significantly reducing the load on the distillation column and lowering energy consumption. A temperature indicator controller II is used to control the preheating of the output crude triethylamine by utilizing the residual heat from the material collected from the bottom of the distillation column I, further reducing energy consumption. The residual triethylamine is then distilled through the distillation column II, and the crude triethylamine in the reflux tank of the distillation column II is transported back to the crude ethylamine tank I, increasing the triethylamine yield.

Description

Technical Field

[0001] This utility model relates to the field of triethylamine production technology, specifically to a multi-mode intelligent reflux control system for a distillation column reflux tank. Background Technology

[0002] In the chemical production field, triethylamine, as an important organic chemical raw material and intermediate, is widely used in pharmaceuticals, pesticides, dyes, and other industries. Its production process involves multiple complex chemical reactions and separation and purification steps, among which distillation is a crucial step in ensuring the quality and purity of triethylamine products. The distillation column, as the core equipment in the distillation process, directly affects product quality and production costs due to its operational efficiency and stability. The reflux tank, as an important component of the distillation column system, plays a vital role in controlling the temperature within the column, improving separation efficiency, and maintaining stable system operation. Traditional distillation column reflux control systems typically employ a single control mode, such as manual control or simple PID control. While these control methods can meet basic production needs to a certain extent, they often suffer from insufficient operational flexibility, high energy consumption, and imprecise product quality control when facing complex and changing operating conditions. For example, in manual control mode, operators need to judge and adjust the reflux ratio based on experience, which not only increases labor intensity but also makes it difficult to guarantee the accuracy and timeliness of control.

[0003] Traditional distillation column reflux control systems result in high column load and high energy consumption during the distillation process, leading to low triethylamine yield.

[0004] In view of this, this application proposes a multi-mode intelligent reflux control system for distillation column reflux tanks. Utility Model Content

[0005] The purpose of this invention is to provide a multi-mode intelligent reflux control system for distillation column reflux tanks, which solves the problems of high concentration, high energy consumption, and low triethylamine yield in traditional distillation column reflux control systems during the distillation process. The technical solution adopted by this invention is as follows:

[0006] A multi-mode intelligent reflux control system for a distillation column reflux tank includes: a hydrochloride preparation vessel, a hydrochloride neutralization vessel, an ethylamine crude product tank I, an ethylamine distillation zone, and a solution flash evaporation pretreatment zone. The hydrochloride preparation vessel is used to produce a hydrochloride solution according to a preset ratio and transfer the hydrochloride solution to the hydrochloride neutralization vessel. The hydrochloride neutralization vessel is used to neutralize the hydrochloride solution to obtain crude triethylamine and an aqueous sodium chloride solution. The crude triethylamine tank I is used to receive the crude triethylamine. The ethylamine distillation zone is used to process the crude triethylamine to obtain the finished triethylamine product. The solution flash evaporation pretreatment zone is used to flash evaporate the aqueous sodium chloride solution to obtain sodium chloride crystals.

[0007] The ethylamine distillation zone includes: distillation column I, distillation column II, crude ethylamine tank II, and coalescence separator I; distillation column I and crude ethylamine tank I are connected; distillation column I is used to purify the crude triethylamine in crude ethylamine tank I to obtain refined triethylamine; coalescence separator I is used to purify the refined triethylamine to obtain finished triethylamine and triethylamine residue; crude ethylamine tank II is used to receive the triethylamine residue; distillation column II is used to purify the triethylamine residue.

[0008] The solution flash evaporation treatment area includes: a sodium chloride dissolving storage tank and a flash evaporation tower; the sodium chloride dissolving storage tank is used to receive the sodium chloride solution; the flash evaporation tower is used to flash evaporate the sodium chloride solution to obtain a concentrated sodium chloride solution.

[0009] The distillation column I and the distillation column II are respectively connected to reboilers; the base of the distillation column I is connected in series with a liquid level indicator controller I and a flow meter I; the liquid level indicator controller I is used to monitor the liquid level at the bottom of the distillation column I in real time; the flow meter I is used to monitor the flow rate of the material collected from the bottom of the distillation column I, and adjust the collected flow rate according to the signal of the flow meter I.

[0010] The crude ethylamine tank I is connected to a temperature indicator controller II; the temperature indicator controller II is used to control the waste heat of the material collected from the bottom of the distillation column I to preheat the feed; the crude ethylamine tank II is connected to a temperature indicator controller V; the temperature indicator controller V is used to control the waste heat of the material collected from the bottom of the distillation column II to preheat the feed.

[0011] The crude ethylamine tank I is equipped with a liquid separator II; the liquid separator is used to monitor the density in real time and automatically separate the water deposited at the bottom of the crude ethylamine tank I into the sodium chloride dissolution storage tank according to a preset threshold.

[0012] The distillation column I is connected to a temperature indicator controller III; the temperature indicator controller III is used to control the temperature of the material drawn from the bottom of the distillation column I.

[0013] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0014] 1. This utility model provides a multi-mode intelligent reflux control system for a distillation column reflux tank. A liquid separator II is installed in the crude ethylamine tank I to automatically separate the water deposited at the bottom of the tank into a sodium chloride dissolution storage tank. Then, the crude triethylamine in the crude ethylamine tank I is transported to the distillation column for distillation, greatly reducing the load on the triethylamine distillation column and lowering energy consumption. A temperature indicator controller II is used to control the waste heat from the material collected from the bottom of the distillation column I to preheat the output crude triethylamine, further reducing energy consumption.

[0015] 2. This utility model provides a multi-mode intelligent reflux control system for distillation column reflux tanks. It adopts a high degree of automation such as single loop, cascade, and split-range, which reduces the consumption of manpower. The triethylamine residue is distilled through distillation column II, and the crude triethylamine in the reflux tank of distillation column II is transported to crude triethylamine tank I, which increases the yield of triethylamine. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 for Figure 1 This is a partial structural schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of another part of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of another part of the structure of this utility model;

[0020] Figure 4 This is a schematic diagram of another part of the structure of this utility model;

[0021] Figure 5 This is a schematic diagram of another part of the structure of this utility model;

[0022] Figure 6 This is a schematic diagram of another part of the structure of this utility model;

[0023] Figure 7 This is a schematic diagram of another part of the structure of this utility model;

[0024] Figure 8 This is a schematic diagram of another part of the structure of this utility model;

[0025] Figure 9 This is a schematic diagram of another part of the structure of this utility model;

[0026] Figure 10 This is a schematic diagram of another part of the structure of this utility model;

[0027] Figure 11 This is a schematic diagram of another part of the structure of this utility model;

[0028] Figure 12 This is a schematic diagram of another part of the structure of this utility model;

[0029] Figure 13 This is a schematic diagram of another part of the structure of this utility model;

[0030] Figure 14 This is a schematic diagram of another part of the structure of this utility model;

[0031] In the diagram: 1. Feed rate quantitative cumulative interlock I; 2. Hydrochloric acid feed rate quantitative cumulative interlock; 3. Feed rate quantitative cumulative interlock II; 4. Feed rate quantitative cumulative interlock III; 5. Level transmitter; 6. Differential pressure instrument; 7. Flow control valve I; 8. Flow control valve II; 9. Temperature indicator controller I; 10. Temperature indicator alarm interlock; 11. Liquid separator I; 12. Liquid separator II; 13. Level indicator alarm interlock I; 14. Flow indicator controller I; 15. Temperature indicator controller II; 16. Temperature... 17. Temperature Indicator Control Alarm I; 18. Liquid Level Indicator Control Alarm I; 19. Flow Indicator Controller II; 20. Flow Meter I; 21. Flow Indicator Controller III; 22. Liquid Level Indicator Controller II; 23. Density Indicator Controller; 24. Temperature Indicator Controller IV; 25. Liquid Level Indicator Controller III; 26. Liquid Level Indicator Controller IV; 27. Flow Indicator Controller IV; 28. Temperature Indicator Controller V; 29. ​​Temperature Indicator Controller VI; 30. Liquid Level Indicator Controller V; 31. Flow Indicator Controller V; 32. Flow Indicator Controller VI; 33. Temperature Indicator Alarm II; 34. Flow Indicator Accumulator; 35. Liquid Level Indicator Control Alarm II; 36. Flow Indicator Controller VII; 37. Manual Switch; 38. Liquid Level Indicator Controller VI; 39. Liquid Level Indicator Controller VII; 40. Liquid Level Indicator Alarm Interlock II; 41. Flow Indicator Controller VIII; 42. Temperature Indicator Alarm III; 43. Flow Indicator Controller IX; 44. Liquid Level Indicator Control Alarm 45. Alarm device III; 46. Flow meter II; 47. Temperature indicator controller VII; 48. Flow indicator controller X; 49. Flow indicator controller XI; 50. Temperature indicator controller VIII; 51. Hydrochloride preparation vessel; 52. Hydrochloride neutralization vessel; 53. Ethylamine crude product tank I; 54. Distillation column I; 55. Distillation column II; 56. Ethylamine crude product tank II; 57. Coalescing and water separation tank I; 58. Sodium chloride dissolving storage tank; 59. Flash distillation column; 60. Reflux tank; 61. Finished product tank. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to embodiments:

[0033] Example 1

[0034] like Figures 1-7 As shown, this utility model provides a multi-mode intelligent reflux control system for a distillation column reflux tank, including a hydrochloride preparation vessel 51, a hydrochloride neutralization vessel 52, an ethylamine crude product tank 53, an ethylamine distillation zone, and a solution flash treatment zone. The hydrochloride preparation vessel 51 is used to produce a hydrochloride solution according to a preset ratio and transfer the solution to the hydrochloride neutralization vessel 52. The hydrochloride neutralization vessel 52 is used to neutralize the hydrochloride solution to obtain triethylamine crude product and a sodium chloride aqueous solution. The ethylamine crude product tank 53 is used to receive the triethylamine crude product. The triethylamine distillation zone is used to process the triethylamine crude product to obtain the finished triethylamine product. The solution flash pretreatment zone is used to flash treat the sodium chloride aqueous solution to obtain sodium chloride crystals.

[0035] In this embodiment of the invention, the hydrochloric acid preparation vessel 51 is equipped with a quantitative cumulative interlock for water feed rate I1 and a quantitative cumulative interlock for hydrochloric acid feed rate I2. These interlocks allow for setting a preset water-to-hydrochloric acid ratio to prepare the hydrochloric acid solution, which can be 1:1.05-1.15. The hydrochloric acid preparation vessel 51 transmits the hydrochloric acid solution to the hydrochloric acid neutralization vessel 52 via a pipeline. Both the preparation vessel 51 and the neutralization vessel 52 are equipped with a quantitative cumulative interlock II3, which controls the flow rate of the hydrochloric acid solution. The neutralization vessel 52 is equipped with a quantitative cumulative interlock III4, which controls the flow rate of the alkali solution entering the neutralization vessel 52. A condenser is connected to the hydrochloric acid neutralization vessel 52. A flow valve connects the hydrochloric acid neutralization vessel 52 and the condenser, controlling the cooling effect of the condenser and thus the temperature of the hydrochloric acid neutralization vessel 52. The hydrochloric acid neutralization vessel is also equipped with a level transmitter 5 and a differential pressure gauge. The level transmitter 5 measures the liquid level in the hydrochloric acid neutralization vessel 52, and the differential pressure gauge monitors the pressure difference within the hydrochloric acid neutralization vessel 52. A liquid separator I11 is installed between the crude ethylamine tank I53 and the hydrochloric acid neutralization vessel 52, separating and transferring water from the solution. A flow control valve I7 is also installed between the hydrochloric acid neutralization vessel and the feed quantity cumulative interlock III4, controlling the output and shut-off of the alkali solution. The hydrochloric acid neutralization vessel 52 can be connected to a water circulation protector. The water circulation protector is equipped with a temperature indicator controller I9. When the temperature in the hydrochloric acid neutralization vessel 52 is too high, the temperature indicator controller I9 can activate the water circulation protector to cool the hydrochloric acid neutralization vessel 52. The hydrochloric acid neutralization vessel 52 is also equipped with a temperature indicator alarm interlock 10, which monitors the temperature in the hydrochloric acid neutralization vessel 52 in real time. When the temperature in the hydrochloric acid neutralization vessel 52 reaches a preset threshold, the feed into the hydrochloric acid neutralization vessel 52 can be shut off, allowing the internal neutralization reaction to continue heating.

[0036] The ethylamine distillation area includes: distillation column I54, distillation column II55, crude ethylamine tank II56, and coalescing and separating tank I57. Distillation column I54 is connected to crude ethylamine tank I53. Distillation column I54 is used to purify the crude triethylamine in crude ethylamine tank I53 to obtain refined triethylamine. Coalescing and separating tank I57 is used to purify the refined triethylamine to obtain finished triethylamine and triethylamine residue. Crude ethylamine tank II56 is used to receive the triethylamine residue. Distillation column II55 is used to purify the triethylamine residue.

[0037] In this embodiment of the invention, a flow indicator controller III21, a level indicator controller II22, and a density indicator controller 23 are provided between the distillation column I54 and the coalescing water separator I57. The flow indicator controller III21 controls the flow rate of the material transferred between the distillation column I54 and the coalescing water separator I57. The level indicator controller II22 monitors the liquid level in the coalescing water separator I57 in real time, and the density indicator controller 23 detects the density in the coalescing water separator I57. A temperature indicator controller IV24 is also provided between the distillation column I54 and the coalescing water separator I57, which controls the temperature transferred between them. The coalescing water separator I57 is equipped with a level indicator controller III25, which monitors the liquid level in the coalescing water separator I57 in real time. When the liquid level is too high, the liquid in the water separator I can be released urgently. A flow indicator controller IV is provided between the crude ethylamine tank II56 and the distillation column II55. Distillation column II55 is connected to an ethylamine product tank, which receives the product distilled from distillation column II55. A temperature indicator controller VI29 is installed between distillation column II55 and the ethylamine product tank, controlling the temperature at which triethylamine enters the tank. The ethylamine product tank is equipped with a level indicator controller IV30 and a flow indicator controller V31. Level indicator controller IV30 monitors the triethylamine level in the tank in real time, while flow indicator controller V31 controls the flow rate of triethylamine out of the tank. At the bottom of distillation column II55, a flow indicator controller VI32 and a temperature indicator alarm II33 are connected in series. Flow indicator controller VI32 controls the flow rate of the substance supplied to distillation column II55 by the reboiler, while temperature indicator alarm II33 controls the temperature transmitted from the reboiler to distillation column II55, automatically triggering an alarm when the temperature exceeds a threshold.

[0038] The crude ethylamine tank II56 is equipped with a level indicator controller IV30, which monitors the liquid level in the crude ethylamine tank II56 in real time. When the temperature of the crude ethylamine tank II56 is too high, the flow indicator controller IV can control the increase of the flow rate. The solution flash evaporation treatment area includes: a sodium chloride dissolving storage tank 58 and a flash evaporation tower 59. The sodium chloride dissolving storage tank 58 is used to receive sodium chloride solution. The flash evaporation tower 59 is used to flash evaporate the sodium chloride solution to obtain a concentrated sodium chloride solution.

[0039] In this embodiment of the invention, a flow indicator controller VIII41 is provided between the sodium chloride dissolving tank 58 and the flash distillation tower 59. The flow indicator controller VIII41 can regulate the flow rate of the sodium chloride dissolving tank 58 and the flash distillation tower 59 for material transfer. The sodium chloride dissolving tank 58 is equipped with a liquid level indicator alarm interlock II40, which can monitor the liquid level in the sodium chloride dissolving tank 58 in real time. When the liquid level is higher than a preset threshold, the flow rate controlled by the flow indicator controller VIII41 can be increased. The flash distillation tower 59 is equipped with a temperature indicator alarm III42 and a liquid level indicator control alarm III44. The temperature indicator alarm III42 is used to monitor the temperature of the flash distillation tower 59 in real time. When the temperature is higher than the threshold, an automatic alarm is triggered. The liquid level indicator control alarm III44 can monitor and control the liquid level in the flash distillation tower 59 in real time. When the liquid level is too high, it can automatically trigger an alarm. Flash tower 59 is connected to a reboiler. A flow indicator controller VIII41 and a flow meter II45 are installed between flash tower 59 and the reboiler. Flow indicator controller VIII41 regulates the flow rate of heat transferred from the reboiler to flash tower 59, and flow meter II45 monitors and records the total flow rate transferred from the reboiler to flash tower 59. Flash tower 59 is connected to a reflux tank 60, which collects the condensed liquid from flash tower 59. Flash tower 59 is equipped with a temperature indicator controller VII46, which controls the bottom temperature. A flow indicator controller XI48 and a condenser are installed between flash tower 59 and reflux tank 60. The condenser condenses the vapor from flash tower 59 and transfers it to reflux tank 60. Flow indicator controller XI48 controls the flow rate of material transfer between flash tower 59 and the condenser. A temperature indicator controller IX50 is installed between the condenser and reflux tank 60, which monitors the temperature of the material transferred from the condenser to reflux tank 60 in real time.

[0040] Distillation columns I54 and II55 are each connected to a reboiler. A level indicator / controller alarm I and a flow meter I20 are connected in series at the base of distillation column I54. The level indicator / controller alarm I is used to monitor the liquid level at the bottom of distillation column I54 in real time. The flow meter I20 is used to monitor the flow rate of the material collected from the bottom of distillation column I54, and the collected flow rate is adjusted according to the signal from the flow meter I20.

[0041] In this embodiment of the invention, a temperature indication control alarm and a flow indication controller II19 are provided between the distillation column I54 and the reboiler. The temperature indication control alarm controls the temperature transmitted from the reboiler to the distillation column I54, and automatically alarms when the temperature exceeds a threshold. The flow indication controller II19 controls the heat flow rate transmitted from the reboiler to the distillation column I54. The two reboilers provide heat to the distillation column I54 and distillation column II55 respectively. A flow indication accumulator 34 and a level indication control alarm II35 are connected in series in distillation column II55. The flow indication accumulator 34 monitors the flow rate of the material collected from the bottom of distillation column II55 and adjusts the collected flow rate according to the signal from the flow meter I20. The level indication control alarm II35 monitors the liquid level at the bottom of distillation column I54 in real time. Distillation column II55 is connected to coalescing separator II. A flow indicator controller VII36 connects distillation column II55 and coalescing separator II, and the flow indicator controller VII36 can monitor the flow rate of mass transfer between column II and coalescing separator II in real time. Coalescing separator II is equipped with a manual switch 37 and a level indicator controller VI38. Manual switch 37 can manually close coalescing separator II, and level indicator controller VI38 can monitor the liquid level in coalescing separator II in real time. A level indicator controller VII39 is also located at the bottom of coalescing separator II. While monitoring the internal condition of coalescing separator II, level indicator controller VII39 can also be used to discharge liquid from coalescing separator II.

[0042] The crude ethylamine tank I53 is connected to a temperature indicator controller II15. Temperature indicator controller II15 uses the residual heat from the material collected from the bottom of distillation column I54 to preheat the feed. The crude ethylamine tank II56 is equipped with a temperature indicator controller V28. Temperature indicator controller V28 is used to control the residual heat from the material collected from the bottom of distillation column II55 to preheat the feed.

[0043] In this embodiment of the invention, the crude ethylamine tank I53 is equipped with a level indication alarm interlock I13, and a flow indicator controller I14 and a temperature indicator controller II15 are installed between the crude ethylamine tank I53 and the distillation column I54. The level indication alarm interlock I13 can monitor the liquid level in the crude ethylamine tank I53 in real time, triggering an alarm when the liquid level exceeds a threshold, and can increase the flow rate controlled by the flow indicator controller I14. The flow indicator controller I14 can control the flow rate of material transfer between the crude ethylamine tank I53 and the distillation column I54. The temperature indicator controller II15 is used to control the heating of the transferred material. Through the temperature indicator controller II15 and temperature indicator controller V28, waste heat recovery and utilization of the feed and bottom product are achieved, reducing energy consumption.

[0044] The crude ethylamine tank I53 is equipped with a liquid separator II12. The liquid separator is used to monitor the density in real time and automatically separate the water deposited at the bottom of the crude ethylamine tank I53 into the sodium chloride dissolution storage tank 58 according to a preset threshold.

[0045] In this embodiment of the invention, water is separated at the bottom of the crude ethylamine tank in advance to reduce the load on the triethylamine distillation tower and reduce energy consumption.

[0046] Distillation column I54 is connected to a temperature indicator controller III16. The temperature indicator controller III16 is used to control the temperature of the material drawn from the base of distillation column I54.

[0047] This invention provides a multi-mode intelligent reflux control system for a distillation column reflux tank. Its working principle is as follows: First, a hydrochloric acid solution is prepared according to a preset ratio in a hydrochloric acid preparation vessel 51. Then, the hydrochloric acid solution is output to a hydrochloric acid neutralization vessel 52 via a quantitative cumulative interlock II3. Neutralization is achieved by adding alkali, yielding crude triethylamine and a sodium chloride solution. These are then transferred to a crude ethylamine tank 153 and a sodium chloride dissolving storage tank 58, respectively. A liquid separator II12 in the crude ethylamine tank 153 automatically separates the water deposited at the bottom of the tank into the sodium chloride dissolving storage tank 58. The crude triethylamine in the crude ethylamine tank 153 is then transported to a distillation column 154 for distillation, significantly reducing the load on the distillation column and lowering energy consumption. Simultaneously, a temperature indicator controller II controls the residual heat from the material collected from the bottom of the distillation column 154 to preheat the output crude triethylamine, further reducing energy consumption. The triethylamine, after being purified by distillation column I54, is then further purified by a coalescing separator to obtain triethylamine product and triethylamine residue. The triethylamine residue is then purified by distillation column II55, and the crude triethylamine in the reflux tank 60 of distillation column II55 is transferred to the crude triethylamine tank I53, increasing the triethylamine yield. The sodium chloride solution in the sodium chloride dissolution storage tank 58 is then flash-distilled by flash distillation column 59 to obtain a concentrated sodium chloride solution.

[0048] This invention provides a multi-mode intelligent reflux control system for a distillation column reflux tank. A liquid separator II12 is installed in the crude ethylamine tank I53 to automatically separate the water deposited at the bottom of the tank into a sodium chloride dissolution storage tank 58. Then, the crude triethylamine in the crude ethylamine tank I53 is transported to the distillation column for rectification, significantly reducing the load on the triethylamine distillation column and lowering energy consumption. A temperature indicator controller II is used to control the waste heat from the bottom of the distillation column I54 to preheat the output crude triethylamine, further reducing energy consumption. This system employs a high degree of automation, including single-loop, cascade, and multi-stage configurations. The residual triethylamine is rectified in distillation column II55, and the crude triethylamine in the reflux tank 60 of distillation column II55 is transported to the crude ethylamine tank I53, increasing the triethylamine yield.

[0049] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A multi-mode intelligent reflux control system for a distillation column reflux tank, characterized in that, include: The system includes a hydrochloride preparation vessel (51), a hydrochloride neutralization vessel (52), an ethylamine crude product tank I (53), an ethylamine distillation zone, and a solution flash treatment zone. The hydrochloride preparation vessel (51) is used to produce a hydrochloride solution according to a preset ratio and transfer the hydrochloride solution to the hydrochloride neutralization vessel (52). The hydrochloride neutralization vessel (52) is used to neutralize the hydrochloride solution to obtain triethylamine crude product and sodium chloride aqueous solution. The ethylamine crude product tank I (53) is used to receive triethylamine crude product. The ethylamine distillation zone is used to process the triethylamine crude product to obtain triethylamine finished product. The solution flash pretreatment zone is used to flash treat the sodium chloride aqueous solution to obtain sodium chloride crystals.

2. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 1, characterized in that... The ethylamine distillation area includes: distillation column I (54), distillation column II (55), crude ethylamine tank II (56), and coalescence separator I (57); distillation column I (54) and crude ethylamine tank I (53) are connected; distillation column I (54) is used to purify the crude triethylamine in crude ethylamine tank I (53) to obtain refined triethylamine; coalescence separator I (57) is used to purify the refined triethylamine to obtain finished triethylamine and triethylamine residue; crude ethylamine tank II (56) is used to receive the triethylamine residue; distillation column II (55) is used to purify the triethylamine residue.

3. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 2, characterized in that, The solution flash evaporation treatment area includes: a sodium chloride dissolving storage tank (58) and a flash evaporation tower (59); the sodium chloride dissolving storage tank (58) is used to receive sodium chloride solution; the flash evaporation tower (59) is used to flash evaporate the sodium chloride solution to obtain a concentrated sodium chloride solution.

4. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 2, characterized in that, The distillation column I (54) and the distillation column II (55) are respectively connected to reboilers; the base of the distillation column I (54) is connected in series with a liquid level indicator controller I (18) and a flow meter I (20); the liquid level indicator controller I (18) is used to monitor the liquid level at the bottom of the distillation column I (54) in real time; the flow meter I (20) is used to monitor the flow rate of the material collected from the bottom of the distillation column I (54) and adjust the collected flow rate according to the signal of the flow meter I (20).

5. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 2, characterized in that, The crude ethylamine tank I (53) is connected to a temperature indicator controller II (15); the temperature indicator controller II (15) is used to control the waste heat of the material taken from the bottom of the distillation column I (54) to preheat the feed; the crude ethylamine tank II (56) is connected to a temperature indicator controller V (28); the temperature indicator controller V (28) is used to control the waste heat of the material taken from the bottom of the distillation column II (55) to preheat the feed.

6. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 3, characterized in that, The crude ethylamine tank I (53) is equipped with a liquid separator II (12); the liquid separator II (12) is used to monitor the density in real time and automatically separate the water deposited at the bottom of the crude ethylamine tank I (53) into the sodium chloride dissolving storage tank (58) according to a preset threshold.

7. The multi-mode intelligent reflux control system for the distillation column reflux tank according to claim 5, characterized in that, The distillation column I (54) is connected to a temperature indicator controller III (16); the temperature indicator controller III (16) is used to control the temperature of the material drawn from the bottom of the distillation column I (54).

Images