An ethylene oxide aqueous solution treatment device

Abstract

The application discloses an ethylene oxide aqueous solution treatment device, and belongs to the technical field of chemical production. The device comprises a light component removal tower a, a light component removal tower b, an ethylene oxide refining tower a and an ethylene oxide refining tower b. The light component removal tower b is connected with a circulating pump through a pipeline. The circulating pump is connected with an ethylene oxide aqueous solution conveying pipeline a through a pipeline. The connected pipeline is sequentially provided with a gate valve a and an electromagnetic valve b. The circulating pump is connected with an ethylene oxide aqueous solution conveying pipeline b through a pipeline. The connected pipeline is sequentially provided with a gate valve b and an electromagnetic valve d. The ethylene oxide aqueous solution conveying pipeline a and the ethylene oxide aqueous solution conveying pipeline b are connected through a pipeline. The device not only solves the process technology of flexible switching between ethylene oxide and ethylene glycol products of an epoxy device, but also solves the technical problem of long-distance conveying of ethylene oxide aqueous solution pipelines. The device is mainly applied to the treatment of ethylene oxide aqueous solution.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water treatment, and particularly relates to an ethylene oxide aqueous solution treatment device. BACKGROUND

[0002] Ethylene oxide plays an important role in chemical production and has a certain demand in various industries. With the rapid development of industry, the total market size of ethylene oxide is increasing, and the higher the ethylene oxide production is, the lower the energy consumption is. The total production of enterprise scale can basically meet the material supply demand of various industries in China. Ethylene oxide is a simple cyclic ether with active chemical properties, flammability, explosiveness, and easy solubility in various organic solvents, and is widely used in washing, pharmaceutical, sterilization, printing and dyeing industries; it is not easy to be transported over a long distance, and thus has strong regionalism. In order to adjust the production capacity structure of ethylene oxide products, the ethylene oxide aqueous solution can be transported over a long distance and transported to any set of devices for production, improving the flexibility of product structure, and achieving production and sales balance and maximizing the economic benefits of the device. The implementation of the project can adjust the production capacity structure of the device, thereby improving the overall economic benefits.

[0003] 201510890708.3 discloses a closed continuous ethylene oxide conveying system and method. The method is that the low-temperature ethylene oxide in the tank area storage tank is pressurized to a set pressure by an ethylene oxide conveying pump, then enters an ethylene oxide conveying cooler, and the ethylene oxide is cooled to a lower temperature by the cooler, then enters an ethylene oxide conveying main pipeline, and is directly conveyed to each user storage tank through a branch pipeline connected with the main pipeline. The excess ethylene oxide product is returned to the tank area storage tank after being cooled by an ethylene oxide recovery cooler. The innovation of the application is to propose a closed continuous ethylene oxide simultaneous multi-point conveying method, which improves the conveying capacity of ethylene oxide products and avoids the safety risks and temperature limitations of ethylene oxide transportation caused by frequent loading and unloading. Pressure monitoring and nitrogen purging facilities are provided on the pipeline to avoid ethylene oxide residue and local pressure abnormalities. The above method is for conveying pure ethylene oxide liquid, while the present application mainly solves the problem of long-distance conveying of ethylene oxide aqueous solution to another set of devices for producing ethylene oxide, thereby improving the ethylene oxide production. The device mainly reduces the risk of long-distance conveying of ethylene oxide aqueous solution, improves the ethylene oxide production, reduces the ethylene glycol production, thereby reduces the overall steam energy consumption of the device, can have certain economic benefits, can achieve production and sales balance and market conditions, and thus achieves the purpose of adjusting the production capacity structure. SUMMARY

[0004] In order to solve the technical problems proposed in the background art, the present design provides an ethylene oxide aqueous solution treatment device, which adopts the following technical scheme:

[0005] An ethylene oxide aqueous solution treatment device is characterized by comprising a light component removal column a, a light component removal column b, a circulating pump a, a circulating pump b, a circulating pump c, and an ethylene oxide refining column b, the circulating pump a is connected with the light component removal column a through a pipeline, and the light component removal column a is provided with a liquid level meter a, a thermometer a, and a reboiler a in the column bottom;

[0006] The circulating pump b 18 is connected with the light component removal column b through a pipeline, and the light component removal column b is provided with a liquid level meter b, a thermometer b, and a reboiler b in the column bottom;

[0007] The ethylene oxide refining column b is connected with a circulating pump d, a flow meter g, a flow control valve g, and an electromagnetic valve g through a pipeline;

[0008] The ethylene oxide refining column b is provided with a reboiler c, a reboiler d, a liquid level meter c, and a thermometer c in the lower part;

[0009] The top of the ethylene oxide refining column b is connected with a reflux tank through a pipeline, and the pipeline is provided with a cooler a, a cooler b, and a thermometer d;

[0010] The lower part of the reflux tank is connected with a circulating pump e, the circulating pump e is connected with the top of the ethylene oxide refining column b through a pipeline, and the pipeline is provided with an electromagnetic valve h, a flow meter i, and a flow control valve i;

[0011] The ethylene oxide refining column b is connected with a cooler c through a pipeline, the cooler c is connected with a circulating pump f through a pipeline, and the circulating pump f is connected with a flow meter h and a flow control valve h through a pipeline;

[0012] The ethylene oxide refining column a is connected with a circulating pump c through a pipeline, and the pipeline is provided with an electromagnetic valve f 33, a flow meter f, and a flow control valve f in sequence;

[0013] The circulating pump b and the circulating pump c are connected through a pipeline, and the pipeline is provided with a thermometer f, a flow meter e, a flow control valve e, an electromagnetic valve e, and a thermometer g;

[0014] The reflux tank is further provided with a pressure gauge b, a pressure control valve a, and a pressure control valve b.

[0015] Preferably, the circulating pump a is connected with an electromagnetic valve a, a flow meter a, a flow control valve a, a flow meter b, a flow control valve b, a gate valve a, an electromagnetic valve d, a gate valve c, and a thermometer e through a pipeline.

[0016] Preferably, the circulating pump b is connected with an electromagnetic valve c, a flow meter c, a flow control valve c, a flow meter d, a flow control valve d, a gate valve b, and an electromagnetic valve d through a pipeline.

[0017] Preferably, a gate valve d is arranged between the electromagnetic valve d and the thermometer f.

[0018] Preferably: the heat source used by the light-ends column a and the light-ends column b is the waste heat of the lean absorbent, with a temperature of 60-65℃.

[0019] Preferably: the heat source used by the ethylene oxide rectification column b reboiler is 0.6 MPa g steam, with a temperature of 150-170℃.

[0020] Preferably: the reflux tank top pressure control valve adopts split-range control, with a pressure gauge controlling the pressure control valve a and the pressure control valve b, and the pressure is controlled at 0.2-0.3 MPa g.

[0021] Preferably: the outlet of the circulating pump a of the light-ends column a is provided with three pipelines, which are respectively sent to the ethylene oxide rectification column b, the EG hydration reactor and the circulating pump b inlet of the light-ends column a, the pipelines are ethylene oxide aqueous solution conveying pipelines, the length of the ethylene oxide aqueous solution conveying pipeline a is about 200 m, the length of the ethylene oxide aqueous solution conveying pipeline b is about 80 m, and the length of the ethylene oxide aqueous solution conveying pipeline c is about 1000 m, wherein the ethylene oxide aqueous solution flow rate is less than 2 m / s.

[0022] The ethylene oxide aqueous solution conveying pipeline a is provided with a gate valve c as a flushing purge valve for emptying and replacing the pipeline, and the ethylene oxide aqueous solution conveying pipeline b is provided with a gate valve d as a flushing purge valve for emptying and replacing the pipeline.

[0023] The ethylene oxide aqueous solution conveying pipeline a is provided with a thermometer e, and if the temperature rises by more than 5-10℃ higher than the light-ends column a column bottom thermometer a, the pipeline conveying can be immediately stopped to prevent heat release during the ethylene oxide aqueous solution conveying process.

[0024] The ethylene oxide aqueous solution conveying pipeline b is provided with a thermometer f, and if the temperature rises by more than 5-10℃ higher than the light-ends column b column bottom thermometer b, the pipeline conveying can be immediately stopped to prevent heat release during the ethylene oxide aqueous solution conveying process.

[0025] The reboiler of the ethylene oxide rectification column b uses 0.6 MPa g steam as a heat source, with a temperature of about 160℃.

[0026] The reflux tank top pressure control valve adopts split-range control, with a pressure gauge controlling the pressure control valve a and the pressure control valve b, and the pressure is controlled at 0.2-0.3 MPa g.

[0027] The ethylene oxide concentration in the ethylene oxide aqueous solution of the present application is about 76.8%, and the water content is about 23%.

[0028] The beneficial effects of the present application are: by adopting the design of the present application, the aqueous ethylene oxide solution can be safely delivered to another set of devices, thereby achieving the purpose of increasing the yield of ethylene oxide, reducing the energy consumption of the device in actual production process, improving the economic benefit of the device, achieving the balance between production and sales, and increasing the yield of ethylene oxide from 872,000 tons / year to 1,000,000 tons / year under the condition of ensuring that the existing equipment is not expanded, which can produce about 128,000 tons of ethylene oxide per year, the marginal profit of adding ethylene oxide is 100 yuan / ton, and the annual economic benefit can reach 12.8 million yuan, if the marginal profit of ethylene oxide is higher, the overall economic benefit is very considerable, the design of the present application is the first in the industry, and very high economic benefit is achieved in actual application, and the whole device is very convenient to use and suitable for comprehensive promotion and application. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The working principle diagram of the aqueous ethylene oxide solution treatment device of the present application.

[0030] In the figure: 1 gate valve d, 2, light component column a, 3 level meter a, 4 thermometer a, 5 circulating pump a, 6 electromagnetic valve a, 7 flow meter a, 8 flow control valve a, 9 flow meter b, 10 flow control valve b, 11 gate valve a, 12 electromagnetic valve b, 13 reboiler a, 14 gate valve c, 15, light component column b, 16 level meter b, 17 thermometer b, 18 circulating pump b, 19 electromagnetic valve c, 20 flow meter c, 21 flow control valve c, 22 flow meter d, 23 flow control valve d, 24 gate valve b, 25 electromagnetic valve d, 26 aqueous ethylene oxide solution delivery pipeline a, 27 aqueous ethylene oxide solution delivery pipeline b, 28 flow meter e, 29 flow control valve e, 30 electromagnetic valve e, 31 circulating pump c, 32 ethylene oxide refining column a, 33 electromagnetic valve f, 34 flow meter f, 35 flow control valve f, 36 ethylene oxide refining column b, 37 reboiler c, 38 reboiler d, 39 level meter c, 40 thermometer c, 41 circulating pump d, 42 flow meter g, 43 flow control valve g, 44 electromagnetic valve g, 45 pressure gauge a, 46 cooler c, 47 circulating pump f, 48 flow meter h, 49 flow control valve h, 50 cooler a, 51 cooler b, 52 reflux tank, 53 pressure gauge b, 54 pressure control valve a, 55 pressure control valve b, 56 circulating pump e, 57 reboiler b, 58 thermometer d, 59 level meter d, 60 electromagnetic valve h, 61 flow meter i, 62 flow control valve i, 63 aqueous ethylene oxide solution delivery pipeline c, 64 thermometer e, 65 thermometer f, 66 thermometer g. DETAILED DESCRIPTION

[0031] Example 1

[0032] As Figure 1 shown:

[0033] An ethylene oxide aqueous solution treatment device, comprising a light component removal column a2, a light component removal column b15, a circulating pump a5, an ethylene oxide aqueous solution conveying pipeline a26, a circulating pump b18, an ethylene oxide aqueous solution conveying pipeline b27, an ethylene oxide aqueous solution conveying pipeline c63, a circulating pump c31 and an ethylene oxide refining column b36, the circulating pump a5 is connected with the ethylene oxide aqueous solution conveying pipeline a26 through a pipeline, the connected pipeline is sequentially provided with a gate valve a11, a solenoid valve b12, a gate valve c14 and a thermometer e64, the circulating pump b18 is connected with the ethylene oxide aqueous solution conveying pipeline b27 through a pipeline, the connected pipeline is sequentially provided with a gate valve b24, a solenoid valve d25, a gate valve d1 and a thermometer f65, the ethylene oxide aqueous solution conveying pipeline a26 and the ethylene oxide aqueous solution conveying pipeline b27 are connected through a pipeline, the ethylene oxide aqueous solution conveying pipeline a26 and the ethylene oxide aqueous solution conveying pipeline b27 are combined through a pipeline and then connected with the ethylene oxide aqueous solution conveying pipeline c63, the ethylene oxide aqueous solution conveying pipeline c63 is connected with the circulating pump c31 through a pipeline, the connected pipeline is sequentially provided with a flow meter e28, a flow control valve e29, a solenoid valve e30 and a thermometer g66, the circulating pump c31 is connected with the ethylene oxide refining column b36 through a pipeline, the gate valve d1 and the gate valve c14 are used for purging and replacing the pipeline after the pipeline stops, the connected pipeline is sequentially provided with a solenoid valve f33, a flow meter f34 and a flow control valve f35;

[0034] The tower kettle of the light component removal column a2 is provided with a liquid level meter a3, a thermometer a4 and a reboiler a13, the reboiler a13 uses waste heat of lean absorption liquid as a heat source;

[0035] The outlet of the circulating pump a5 is provided with three pipelines, which are respectively sent to the ethylene oxide refining column b36, an EG hydration reactor and an inlet of the circulating pump c, the pipeline is the ethylene oxide aqueous solution conveying pipeline a26;

[0036] The light component removal column b15 is provided with a liquid level meter b16, a thermometer b17 and a reboiler b57, the reboiler b57 uses waste heat of lean liquid as a heat source;

[0037] The outlet of the light component removal column b15 is provided with three pipelines, which are respectively sent to the ethylene oxide refining column b, an EG hydration reactor and an inlet of the circulating pump c31, the pipeline is the ethylene oxide aqueous solution conveying pipeline b27, which is combined with the ethylene oxide aqueous solution conveying pipeline a26 and then sent to the inlet of the circulating pump c31 of the ethylene oxide refining column a32 and then to the ethylene oxide refining column b36;

[0038] The ethylene oxide aqueous solution conveying pipeline a26 is sequentially provided with the gate valve a11, the solenoid valve b12, the gate valve c14 and the thermometer e64;

[0039] The ethylene oxide aqueous solution conveying pipeline b27 is provided with a gate valve b24, an electromagnetic valve d25, a gate valve d1 and a thermometer g66 in sequence;

[0040] The ethylene oxide aqueous solution conveying pipeline c63 is provided with a flowmeter e28, a flow control valve e29, an electromagnetic valve e30 and a thermometer g66 in sequence;

[0041] When the marginal benefit of ethylene oxide decreases, the device reduces the ethylene oxide production, and then the ethylene oxide aqueous solution conveying pipeline a, the ethylene oxide aqueous solution conveying pipeline b27 and the ethylene oxide aqueous solution conveying pipeline c63 need to be stopped. After the pipelines are stopped, they need to be purged and replaced. By closing the gate valve a11, closing the electromagnetic valve b12, connecting the gate valve c14 to the DMW desalted water to flush the pipeline, and after a long time of flushing, low-pressure nitrogen is introduced to purge the entire pipeline to make it clean.

[0042] Similarly, when the ethylene oxide aqueous solution conveying pipeline b27 is purged and replaced, by closing the gate valve b24, closing the electromagnetic valve d25, connecting the gate valve d1 to the DMW desalted water to flush the pipeline, and after a long time of flushing, low-pressure nitrogen is introduced to purge the entire pipeline to make it clean. At this time, the ethylene oxide aqueous solution conveying pipeline c63 is also purged and replaced to be clean, and is ready for use next time.

[0043] Example 2

[0044] As shown in Figure 1 :

[0045] An ethylene oxide aqueous solution treatment device, comprising a light component removal column a2, a light component removal column b15, a circulating pump a5, an ethylene oxide aqueous solution conveying pipeline a26, a circulating pump b18, an ethylene oxide aqueous solution conveying pipeline b27, an ethylene oxide aqueous solution conveying pipeline c63, a circulating pump c31 and an ethylene oxide refining column b36. The circulating pump a5 is connected to the ethylene oxide aqueous solution conveying pipeline a26 through a pipeline, and the connected pipeline is provided with a gate valve a11, an electromagnetic valve b12 and a gate valve c14 in sequence. The circulating pump b18 is connected to the ethylene oxide aqueous solution conveying pipeline b27 through a pipeline, and the connected pipeline is provided with a gate valve b24, an electromagnetic valve d25 and a gate valve d1 in sequence. The ethylene oxide aqueous solution conveying pipeline a26 and the ethylene oxide aqueous solution conveying pipeline b27 are connected through a pipeline, and the ethylene oxide aqueous solution conveying pipeline a26 and the ethylene oxide aqueous solution conveying pipeline b27 are connected to the ethylene oxide aqueous solution conveying pipeline c63 through a pipeline after being combined. The ethylene oxide aqueous solution conveying pipeline c63 is connected to the circulating pump c31 through a pipeline, and the connected pipeline is provided with a flowmeter e28, a flow control valve e29, an electromagnetic valve e30 and a thermometer g66 in sequence. The circulating pump c31 is connected to the ethylene oxide refining column b36 through a pipeline, and the connected pipeline is provided with an electromagnetic valve f33, a flowmeter f34 and a flow control valve f35 in sequence.

[0046] The light component removal column a2 column is provided with a liquid level meter a3, a thermometer a4 and a reboiler a13, and the reboiler a13 uses the waste heat of the lean absorption liquid as a heat source;

[0047] The outlet of the circulating pump a5 is provided with three pipelines, which are respectively sent to the ethylene oxide refining column b36, the EG hydration reactor and the circulating pump c inlet of the ethylene oxide refining column a32, and the pipeline is an ethylene oxide aqueous solution conveying pipeline a26.

[0048] The light component removal column b15 is provided with a liquid level meter b16, a thermometer b17 and a reboiler b57, and the reboiler b57 uses the waste heat of the lean liquid as a heat source.

[0049] The outlet of the light component removal column b15 is provided with three pipelines, which are respectively sent to the ethylene oxide refining column b, the EG hydration reactor and the circulating pump c31 inlet of the ethylene oxide refining column a32, and the pipeline is an ethylene oxide aqueous solution conveying pipeline b27, which is combined with the ethylene oxide aqueous solution conveying pipeline a26 to be sent to the circulating pump c31 inlet of the ethylene oxide refining column a32, and then to the ethylene oxide refining column b36.

[0050] The ethylene oxide aqueous solution conveying pipeline a26 is sequentially provided with a gate valve a11, a solenoid valve b12, a gate valve c14 and a thermometer e64.

[0051] The ethylene oxide aqueous solution conveying pipeline b27 is sequentially provided with a gate valve b24, a solenoid valve d25, a gate valve d1 and a thermometer f65.

[0052] The ethylene oxide aqueous solution conveying pipeline c63 is sequentially provided with a flow meter e28, a flow control valve e29, a solenoid valve e30 and a thermometer g66.

[0053] The top of the ethylene oxide refining column b36 is provided with a side line to extract ethylene oxide products, and the extraction side line is sequentially provided with a cooler c46 and a circulating pump f47, and the outlet of the circulating pump f47 is provided with a flow meter h48 and a flow control valve h49.

[0054] The top of the ethylene oxide refining column b is provided with a reflux tank 52, and the pipeline into the reflux tank 52 is sequentially provided with a cooler a50 and a cooler b51, and the outlet of the cooler b51 is provided with a thermometer d58.

[0055] The reflux tank 52 is provided with a liquid level meter d59 and a pressure gauge b53, and the top of the reflux tank 52 is provided with a pressure control valve a54 and a pressure control valve b55.

[0056] The heat source used by the light component removal column a2 is the waste heat of the lean absorption liquid, and the temperature is 60-65℃.

[0057] The heat source used by the light component removal column b15 is the waste heat of the lean absorption liquid, and the temperature is 60-65℃.

[0058] The length of the ethylene oxide aqueous solution conveying pipeline a26 is about 200 m; the length of the ethylene oxide aqueous solution conveying pipeline b27 is about 80 m; and the length of the ethylene oxide aqueous solution conveying pipeline c63 is about 1000 m.

[0059] The ethylene oxide aqueous solution conveying pipeline a26 is provided with a gate valve c14 as a flushing purge valve for emptying and replacing the pipeline; and the ethylene oxide aqueous solution conveying pipeline b27 is provided with a gate valve d1 as a flushing purge valve for emptying and replacing the pipeline.

[0060] The ethylene oxide aqueous solution conveying pipeline a26 is provided with a thermometer e64; if the temperature rises by 5-10℃ higher than the value of the thermometer a4, the pipeline conveying can be immediately stopped to prevent the heat release during the ethylene oxide aqueous solution conveying.

[0061] The ethylene oxide aqueous solution conveying pipeline b27 is provided with a thermometer f65; if the temperature rises by 5-10℃ higher than the value of the thermometer b17, the pipeline conveying can be immediately stopped to prevent the heat release during the ethylene oxide aqueous solution conveying.

[0062] The reboiler b57 and the reboiler c37 of the ethylene oxide refining tower b36 use a heat source of 0.6 Mpag steam with a temperature of about 160℃.

[0063] The top pressure control valve of the reflux tank 52 adopts a split control, and the pressure table controls the pressure control valve a54 and the pressure control valve b55, and the pressure is controlled at 0.2-0.3 Mpag.

[0064] When the actual value of the pressure table b53 is higher than the set value, the pressure control valve b55 is gradually closed until it is closed, and the actual value of the pressure is still higher than the set value, then the pressure control valve a54 is slowly opened to release pressure; when the actual value of the pressure table b53 is lower than the set value, the pressure control valve a54 is slowly closed until it is closed, and the actual value of the pressure is still lower than the set value, then the pressure control valve b55 is slowly opened.

[0065] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements can be made, and these improvements should also be considered as the protection scope of the present application.

Claims

1. An ethylene oxide aqueous solution treatment device, characterized in that: It includes a light component removal tower a (2), a light component removal tower b (15), a circulating pump a (5), a circulating pump b (18), a circulating pump c (31) and an ethylene oxide refining tower b (36), wherein the circulating pump a (5) is connected to the light component removal tower a (2) through a pipeline, and the tower bottom of the light component removal tower a (2) is provided with a liquid level gauge a (3), a thermometer a (4) and a reboiler a (13); The circulation pump a (5) is connected to the light component removal tower a (2) through a pipeline; The outlet of the circulation pump a (5) is provided with three pipelines, which are respectively sent to the ethylene oxide refining tower b (36), the EG hydration reactor, and the inlet of the circulation pump c (31); The outlet of the light component removal tower b (15) is provided with three pipelines, which are respectively sent to the ethylene oxide refining tower b (36), the EG hydration reactor, and the inlet of the circulation pump c (31); The circulation pump a (5) is connected to the ethylene oxide aqueous solution delivery pipeline a (26) through a pipeline, and the connected pipeline is provided with a gate valve a (11), a solenoid valve b (12), a gate valve c (14) and a thermometer e (64) in sequence. The circulation pump b (18) is connected to the ethylene oxide aqueous solution delivery pipeline b (27) through a pipeline, and the connected pipeline is provided with a gate valve b (24), a solenoid valve d (25), a gate valve d (1) and a thermometer f (65) in sequence. The ethylene oxide aqueous solution delivery pipeline a (26) and the ethylene oxide aqueous solution delivery pipeline b (27) are connected to the ethylene oxide aqueous solution delivery pipeline c (63) through a pipeline, and the ethylene oxide aqueous solution delivery pipeline c (63) is connected to the circulation pump c (31) through a pipeline; The circulation pump c (31) is connected to the ethylene oxide refining tower b (36) through a pipeline. The gate valve d and the gate valve c are used to purge and replace the pipeline after the pipeline stops; The circulating pump b (18) is connected to the light component removal tower b (15) through a pipeline. The tower bottom of the light component removal tower b (15) is provided with a liquid level gauge b (16), a thermometer b (17) and a reboiler b (57); The ethylene oxide refining tower b (36) is connected to a circulation pump d (41), a flow meter g (42), a flow control valve g (43) and a solenoid valve g (44) through pipelines; The lower part of the ethylene oxide refining tower b (36) is provided with a reboiler c (37), a reboiler d (38), a liquid level gauge c (39) and a thermometer c (40); The top of the ethylene oxide refining tower b (36) is connected to the reflux tank (52) through a pipeline, and the connected pipeline is provided with a cooler a (50), a cooler b (51) and a thermometer d (58); The lower part of the reflux tank (52) is connected via a circulation pump e (56), which is connected to the top of the ethylene oxide refining tower b (36) via a pipeline. The connected pipeline is provided with a solenoid valve h (60), a flow meter i (61) and a flow control valve i (62); The ethylene oxide refining tower b (36) is connected to the cooler c (46) through a pipeline, the cooler c (46) is connected to the circulation pump f (47) through a pipeline, and the circulation pump f (47) is connected to the flow meter h (48) and the flow control valve h (49) through a pipeline; The ethylene oxide refining tower a (32) is connected to the circulation pump c (31) through a pipeline, and the connected pipeline is provided with a solenoid valve f (33), a flow meter f (34) and a flow control valve f (35) in sequence; Circulating pump b (18) and circulating pump c (31) are connected by a pipeline, and a thermometer f (65), a flow meter e (28), a flow control valve e (29), a solenoid valve e (30) and a thermometer g (66) are provided on the connected pipeline; The reflux tank (52) is also provided with a pressure gauge b (53), a pressure control valve a (54) and a pressure control valve b (55).

2. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: The circulating pump a (5) is connected to the electromagnetic valve a (6), the flow meter a (7), the flow control valve a (8), the flow meter b (9), the flow control valve b (10), the gate valve a (11), the electromagnetic valve d (25), the gate valve c (14) and the thermometer e (64) through pipelines.

3. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: The circulation pump b (18) is connected to the solenoid valve c (19), the flow meter c (20), the flow control valve c (21), the flow meter d (22), the flow control valve d (23), the gate valve b (24) and the solenoid valve d (25) through pipelines.

4. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: A gate valve d (1) is provided between the solenoid valve d (25) and the thermometer f (65).

5. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: The heat source used by the light component removal tower a (2) and the light component removal tower b (15) is the waste heat of the lean absorption liquid, with a temperature of 60°C-65°C.

6. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: The reboiler of the ethylene oxide refining tower b (36) uses 0.6Mpag steam as the heat source, with a temperature of 150℃-170℃.

7. The ethylene oxide aqueous solution treatment device according to claim 1, characterized in that: The pressure control valve at the top of the reflux tank (52) adopts split-range control. The pressure gauge controls the pressure control valve a (54) and the pressure control valve b (55). The pressure is controlled at 0.2~0.3Mpag.

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