Device for separating hydrogenation liquid from byproducts in production of 2, 5-dimethyl-2, 5-hexanediol

Abstract

The utility model discloses a hydrogenation liquid and by-product separation device in production of 2, 5-dimethyl-2, 5-hexanediol, and belongs to the field of chemical production devices. Comprising a catalyst separator (1), a concentrated head tank A (6), a concentrated head tank B (7), a conductivity meter A (10), a hexanediol pump (11), a by-product pump (12), a hexanediol evaporator (14), a by-product evaporator (19), a heat exchanger A (20), a heat exchanger B (21), a vacuum buffer tank (22), a hexanediol water return tank (24), a conductivity meter B (26) and a water return pump (27) which are connected through a pipeline, and a stop valve and / or a regulating valve are / is arranged on the pipeline. The utility model can solve the problems of increased impurities and low main content of finished products caused by manual continuous observation in the prior art, effectively reduce the manpower load and improve the product quality.

Description

Technical Field

[0001] The utility model relates to the field of chemical production equipment, in particular to a device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol. Background Art

[0002] Catalytic hydrogenation is a critical step in the production of 2,5-dimethyl-2,5-hexanediol. During this process, the hydrogenation liquid must be separated from byproducts (2,5-dimethyl-2-hexanol, 3,3,5-trimethylcyclohexanone, and 3,3,5-trimethylcyclohexanol). Currently, the method for separating the hydrogenation liquid from the byproducts is typically to install a quartz glass sight glass on the feed line of the hydrogenation liquid into the evaporator. The sight glass is then manually observed, and feeding is stopped when byproducts are detected. This continuous manual observation is prone to fatigue, leading to missed detections, ultimately resulting in increased impurities in the finished product and low levels of the main products. Utility Model Content

[0003] The purpose of this utility model is to provide a device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol to solve the above problems.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a device for separating hydrogenated liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol, comprising a catalyst separator, a high-level hexane concentrate tank A, a high-level hexane concentrate tank B, a conductivity meter A, a hexanediol pump, a by-product pump, a hexanediol evaporator, a by-product evaporator, a heat exchanger A, a heat exchanger B, a vacuum buffer tank, a hexanediol return tank, a conductivity meter B and a return pump, wherein:

[0005] The catalyst separator is connected to the hexane concentrate high-level tank A through a shut-off valve A and a shut-off valve B, respectively, and is connected to the hexane concentrate high-level tank B through a shut-off valve C and a shut-off valve D with a pipeline; the hexane concentrate high-level tank A is connected to the conductivity meter A through a shut-off valve E, and the hexane concentrate high-level tank B is connected to the conductivity meter A through a shut-off valve F; the conductivity meter A is connected to the hexane glycol evaporator through a pipeline through a hexane glycol pump and a regulating valve A; the hexane concentrate high-level tank A is connected to the by-product pump through a shut-off valve G, the hexane concentrate high-level tank B is connected to the by-product pump through a shut-off valve H, and the by-product pump is connected to the by-product evaporator through a pipeline through a shut-off valve I; the hexane glycol evaporator is connected to the hexane glycol return water tank through a heat exchanger A and a vacuum buffer tank; the by-product evaporator is connected to the hexane glycol return water tank through a heat exchanger B and a vacuum buffer tank with a pipeline; the hexane glycol return water tank is connected to the by-product evaporator through a shut-off valve K, a conductivity meter B, a return water pump, a flow meter, and a regulating valve B.

[0006] The inventors utilized the principle of different electrical conductivities of 2,5-dimethyl-2,5-hexanediol aqueous solution and by-products, set up a conductivity meter during production and cleverly combined it with other equipment. After online monitoring automatically identified the by-products, the signal was transmitted to the control room via an electrical signal to realize automatic cutting operation, thereby achieving effective separation of hydrogenation liquid and by-products, increasing the main content of the product and stabilizing the quality.

[0007] As a preferred technical solution, the by-product evaporator is provided with a liquid level sensor, a temperature sensor, a pressure sensor, a steam regulating valve and a sampling port.

[0008] As a preferred technical solution, the conductivity meter A and the conductivity meter B are both online conductivity meters.

[0009] As a preferred technical solution, the shut-off valve A, shut-off valve B, shut-off valve C, shut-off valve D, shut-off valve E, shut-off valve F, shut-off valve G, shut-off valve H, shut-off valve I, shut-off valve J, and shut-off valve K are all remote online shut-off valves.

[0010] As a preferred technical solution, the regulating valve A and regulating valve B are remote online regulating valves; and the steam regulating valve is a remote online steam regulating valve.

[0011] The use of remote control can effectively reduce manual participation, improve efficiency and reduce worker risks.

[0012] As a preferred technical solution, the material outlet of the by-product evaporator is also connected to a vaporization device

[0013] As a preferred technical solution, the hexanediol by-product evaporation device is provided with a remote liquid level gauge, a pressure sensor, a temperature sensor, a steam regulating valve and a sampling port.

[0014] Compared with the existing technology, the advantages of the present invention are: the present invention can solve the problem of increased impurities and low main content in the finished product caused by manual continuous observation in the existing technology, effectively reduce the manpower burden, and improve product quality. After adopting the separation device of the present invention, the main content can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] In the figure: 1. Catalyst separator; 2. Shut-off valve A; 3. Shut-off valve B; 4. Shut-off valve C; 5. Shut-off valve D; 6. Hexane concentrate high-level tank A; 7. Hexane concentrate high-level tank B; 8. Shut-off valve E; 9. Shut-off valve F; 10. Conductivity meter A; 11. Hexanediol pump; 12. By-product pump; 13. Regulating valve A; 14. Hexanediol evaporator; 15. Shut-off valve G; 16. Shut-off valve H; 17. Shut-off valve I; 18 , shut-off valve J; 19. By-product evaporator; 20. Heat exchanger A; 21. Heat exchanger B; 22. Vacuum buffer tank; 23. Vacuum unit; 24. Hexanediol return tank; 25. shut-off valve K; 26. Conductivity meter B; 27. Return pump; 28. Flow meter; 29. Control valve B; 30. Liquid level sensor; 31. Temperature sensor; 32. Pressure sensor; 33. Steam control valve; 34. Sampling port. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings. Example

[0018] See also Figure 1 A device for separating hydrogenated liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol comprises a catalyst separator 1, a hexanediol concentrate header tank A6, a hexanediol concentrate header tank B7, a conductivity meter A10, a hexanediol pump 11, a by-product pump 12, a hexanediol evaporator 14, a by-product evaporator 19, a heat exchanger A20, a heat exchanger B21, a vacuum buffer tank 22, a hexanediol return tank 24, a conductivity meter B26, and a return pump 27.

[0019] The catalyst separator 1 is connected to the hexane high-level tank A6 through a shut-off valve A2 and a shut-off valve B3, and is also connected to the hexane high-level tank B7 through a shut-off valve C4 and a shut-off valve B5. The hexane high-level tank A6 is connected to the conductivity meter A10 through a shut-off valve E8, and the hexane high-level tank B7 is connected to the conductivity meter A10 through a shut-off valve F9. The conductivity meter A10 is connected to the hexane glycol evaporator 14 through a pipe through a hexane glycol pump 11 and a regulating valve A13. The hexane high-level tank A6 is connected to the by-product pump 12 through a shut-off valve G15, and the hexane high-level tank B7 is connected to the by-product pump 12 through a shut-off valve G15. H16 is connected to the by-product pump 12 by a pipeline, and the by-product pump 12 is connected to the by-product evaporator 19 by a pipeline through a shut-off valve I17; the hexanediol evaporator 14 is connected to the hexanediol return tank 24 by a pipeline through a heat exchanger A20 and a vacuum buffer tank 22; the by-product evaporator 19 is connected to the hexanediol return tank 24 by a pipeline through a heat exchanger B21 and a vacuum buffer tank 22; the hexanediol return tank 24 is connected to the by-product evaporator 19 by a pipeline through a shut-off valve K25, a conductivity meter B26, a return pump 27, a flow meter 28, and a regulating valve B29, and the vacuum buffer tank 22 is connected to a vacuum unit 23;

[0020] Figure 1 The direction of the arrow in the middle is the direction of material flow, among which arrow a is the entry of hydrogenation liquid from the hydrogenation kettle, arrows b and c are the degassing device, arrow d is the cooling water return, arrow e is the cooling water supply, arrow f is the steam entry, arrow g is the steam condensate, and arrow h is the hydrogenation oil by-product removal tank

[0021] Unless otherwise specified, the components of the above devices can be obtained commercially.

[0022] In this embodiment, the by-product evaporator 19 is provided with a remote liquid level sensor 30, a pressure sensor 32, a temperature sensor 31, a steam regulating valve 33 and a sampling port 34;

[0023] The conductivity meters A10 and B26 are online conductivity meters. The shut-off valves A2, B3, C4, D5, E8, F9, G15, H16, I17, J18, and K25 are all remote online shut-off valves. The regulating valves A13 and B29 are remote online regulating valves. The steam regulating valve 33 is a remote online steam regulating valve.

[0024] The material outlet degassing device of the hexanediol evaporator 14;

[0025] During the initial operation, the upstream hydrogenation liquid passes through the catalyst separator 1 to separate 95% of the catalyst, and then the glycol aqueous solution, by-products, and a small amount of catalyst enter the glycol high-level tank A6 through the insertion pipe with a depth of 200 mm from the bottom through the cut-off valve B3. When the liquid level exceeds 1 / 2 of the height of the glycol high-level tank A6, the cut-off valve B3 is closed, and the cut-off valve A2 is opened to enter the glycol high-level tank A6 through the insertion pipe with a depth of 1 / 2 of the height of the glycol high-level tank A6; when the liquid level reaches 80% of the height of the glycol high-level tank A6, the operation is switched to the glycol high-level tank B7; after the glycol high-level tank A6 has been settled for 3 hours, the cut-off valve E8 and the regulating valve A13 are opened, and the glycol pump 11 is turned on to feed the glycol evaporator 14, and the regulating valve is adjusted. The regulating valve A13 is opened to maintain the continuous evaporation of the liquid level of the hexylene glycol evaporator 14; when the value measured by the conductivity meter A10 is less than 1 μs / cm, the shut-off valve E8 and the regulating valve A13 are closed and the hexylene glycol pump 11 is stopped, and the operation is switched to the hexylene glycol high-level tank B7, the shut-off valve F9 and the regulating valve A13 are opened, and the hexylene glycol pump 11 is started to feed the hexylene glycol evaporator 14, and the opening of the regulating valve A13 is adjusted to maintain the continuous evaporation of the liquid level of the hexylene glycol evaporator 14; when the value measured by the conductivity meter A10 is less than 1 μs / cm, the shut-off valve F9 and the regulating valve A13 are closed and the hexylene glycol pump 11 is stopped, and the operation is repeatedly switched to the hexylene glycol high-level tank A6 and the hexylene glycol high-level tank B7 to complete the separation of the hexylene glycol aqueous solution and the by-products;

[0026] When the by-product in the hexane high-level tank A6 needs to be transferred to the by-product evaporator 19, the shut-off valve G15 and the shut-off valve I17 are opened, the by-product pump 12 is started, and all the by-products in the hexane high-level tank A6 are transferred to the by-product evaporator 19, and then the shut-off valve G15 and the shut-off valve I17 are closed, and the by-product pump 12 is stopped; when the by-product in the hexane high-level tank B7 needs to be transferred to the by-product evaporator 19, the shut-off valve H16 and the shut-off valve I17 are opened, the by-product pump 12 is started, and all the by-products in the hexane high-level tank B7 are transferred to the by-product evaporator 19, and then the shut-off valve H16 and the shut-off valve I17 are closed, and the by-product pump 12 is stopped. ; Open the shut-off valve K25, fully open the regulating valve B29 to start the return water pump 27, adjust the opening of the steam regulating valve 33 to 70%, and then keep the liquid level of the by-product evaporator 19 unchanged by adjusting the opening of the regulating valve B29. After continuous distillation for 3 hours, sample and analyze the component content of the material in the by-product evaporator 19 through the sampling port 34. The concentration end point is that the total content of the three characteristic peaks (2,5-dimethyl-2-hexanol, 3,3,5-trimethylcyclohexanol, and 2,5-dimethylhexane) does not exceed 1.0%. The end point material enters the vaporization device. If it is unqualified, continue distilling for 1 hour and then take samples until it is qualified.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol, characterized in that: The invention comprises a catalyst separator (1), a hexanediol high-level tank A (6), a hexanediol high-level tank B (7), a conductivity meter A (10), a hexanediol pump (11), a by-product pump (12), a hexanediol evaporator (14), a by-product evaporator (19), a heat exchanger A (20), a heat exchanger B (21), a vacuum buffer tank (22), a hexanediol return tank (24), a conductivity meter B (26) and a return pump (27), wherein: The catalyst separator (1) is connected to the hexane high-level tank A (6) through the shut-off valve A (2) and the shut-off valve B (3), and is connected to the hexane high-level tank B (7) through the shut-off valve C (4) and the shut-off valve D (5). The hexane high-level tank A (6) is connected to the conductivity meter A (10) through the shut-off valve E (8), and the hexane high-level tank B (7) is connected to the conductivity meter A (10) through the shut-off valve F (9). The conductivity meter A (10) is connected to the hexanediol evaporator (14) through the hexanediol pump (11) and the regulating valve A (13). The hexane high-level tank A (6) is connected to the by-product pump (12) through the shut-off valve G (15). Tank B (7) is connected to the by-product pump (12) by a pipeline through a shut-off valve H (16), and the by-product pump (12) is connected to the by-product evaporator (19) by a pipeline through a shut-off valve I (17); the hexanediol evaporator (14) is connected to the hexanediol return water tank (24) by a pipeline through a heat exchanger A (20) and a vacuum buffer tank (22); the by-product evaporator (19) is connected to the hexanediol return water tank (24) by a pipeline through a heat exchanger B (21) and a vacuum buffer tank (22); the hexanediol return water tank (24) is connected to the by-product evaporator (19) by a pipeline through a shut-off valve K (25), a conductivity meter B (26), a return water pump (27), a flow meter (28), and a regulating valve B (29).

2. The device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol according to claim 1, characterized in that: The by-product evaporator (19) is provided with a liquid level sensor (30), a temperature sensor (31), a pressure sensor (32), a steam regulating valve (33) and a sampling port (34).

3. The device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol according to claim 1, characterized in that: The conductivity meter A (10) and the conductivity meter B (26) are both online conductivity meters.

4. The device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol according to claim 1, characterized in that: The shut-off valve A (2), shut-off valve B (3), shut-off valve C (4), shut-off valve D (5), shut-off valve E (8), shut-off valve F (9), shut-off valve G (15), shut-off valve H (16), shut-off valve I (17), shut-off valve J (18), and shut-off valve K (25) are all remote online shut-off valves.

5. The device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol according to claim 2, characterized in that: The regulating valve A (13) and regulating valve B (29) are remote online regulating valves; the steam regulating valve (33) is a remote online steam regulating valve.

6. The device for separating hydrogenation liquid and by-products in the production of 2,5-dimethyl-2,5-hexanediol according to claim 1, characterized in that: The material outlet of the by-product evaporator (19) is also connected to a vaporization device.

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