Energy-saving single-tower operation device for separating and recovering refined solvent from C5

Abstract

The utility model discloses an energy-saving single-tower operating device for separating and recovering a refined solvent from C5, which comprises a skirt, a lower barrel is arranged at the top end of the skirt, and an upper barrel is arranged at the top end of the lower barrel. The method comprises the following steps: introducing crude acetonitrile in a solvent recovery tower into a solvent refining tower from a ninth connecting pipe, carrying out light component removal operation through preliminary heating, removing impurities such as acetone in the crude acetonitrile, keeping the liquid level of a reflux tank in the solvent refining tower to be stable and slightly expanded, extracting light components from an eighth connecting pipe, removing light impurities in the crude acetonitrile, and recovering the light components from the eighth connecting pipe. The method comprises the following steps: firstly, completely guiding light components in a reflux tank at the top of the tower, controlling the liquid level of the reflux tank to be constant, then carrying out heavy component removal operation, continuously extracting the light components from an eighth connecting pipe at the top of the tower, and extracting tower kettle components when the content of acetonitrile in the tower kettle is lower than 2%, thereby completing an acetonitrile refining process.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon five separation and recovery of refined solvents, in particular to an energy-saving single-tower operating device for carbon five separation and recovery of refined solvents. Background Art

[0002] The C5 raw material contains about 1% of polar organic impurities such as propylene alcohol, which are easily dissolved in the circulating acetonitrile. According to production practice research, the solvent used for C5 separation produces impurities with propylene alcohol, acetone and polymer as the main components after long-term recycling, which seriously affects the extraction effect. The existing technology is to replace part of the fresh acetonitrile to improve the extraction capacity when the extraction effect of the circulating acetonitrile is extremely low, or to build a double tower to continuously remove the heavy and light acetonitrile, but these two methods will greatly increase the production cost and construction cost.

[0003] In order to solve the above problems, an energy-saving single-tower operating device for separating and recovering refined solvents from C5 is proposed. Utility Model Content

[0004] The utility model aims to provide an energy-saving single-tower operating device for separating and recovering refined solvents from C5, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an energy-saving single-tower operating device for separating and recovering refined solvents from carbon five, comprising a skirt seat, a lower cylinder body is arranged at the top of the skirt seat, an upper cylinder body is arranged at the top of the lower cylinder body, an elliptical upper head is arranged at the top of the upper cylinder body, an eighth connecting pipe is connected to the middle of the top of the elliptical upper head, a seventh connecting pipe is connected to one side of the upper cylinder body, a tower top hanging column is arranged at the top of the upper cylinder body away from the seventh connecting pipe, a platform is arranged at the middle of the upper cylinder body away from the seventh connecting pipe, an external tower pre-weld is arranged at the bottom of the upper cylinder body away from the seventh connecting pipe, a fifth connecting pipe, a fourth connecting pipe and a second connecting pipe are connected to one side of the lower cylinder body from top to bottom in sequence, a ninth connecting pipe, a sixth connecting pipe and a third connecting pipe are connected to the side of the lower cylinder body away from the second connecting pipe in sequence from top to bottom, and an entry hole is opened in the middle of the lower cylinder body.

[0006] The crude acetonitrile in the solvent recovery tower is introduced into the solvent refining tower from the ninth connecting pipe, and the light component removal operation is first performed through preliminary heating to remove impurities such as acetone in the crude acetonitrile. In the process of light component removal, the tower bottom index is guaranteed to be qualified so that the tower bottom carries as little light components as possible. The liquid level of the reflux tank in the solvent refining tower is kept stable and slightly increased, and the light components are extracted from the eighth connecting pipe. After the light impurities in the crude acetonitrile are removed, the light components in the reflux tank at the top of the tower are first drained, and the liquid level of the reflux tank is controlled to be constant, and then the heavy component removal operation is performed. The light components are continuously extracted from the eighth connecting pipe at the top of the tower. When the acetonitrile content in the tower bottom is lower than 2%, the tower bottom components are extracted to complete the acetonitrile refining process.

[0007] Preferably, an elliptical lower head is provided at the connection between the lower cylinder and the skirt, the middle of the elliptical lower head is connected with a first connecting pipe, and the end of the first connecting pipe away from the elliptical lower head is set as a material outlet, so that the material can be easily discharged through the first connecting pipe.

[0008] Preferably, an anti-vortex baffle is provided on the inner side of the elliptical lower head, and the anti-vortex baffle is arranged corresponding to the first connecting pipe. The setting of the anti-vortex baffle can cause vortex during the discharge process.

[0009] Preferably, a base ring plate is provided at the bottom of the skirt surface, and a tail lifting ear is provided on one side of the base ring plate. The provision of the base ring plate can play a reinforcing role.

[0010] Preferably, tower internals are provided inside the lower cylinder and inside the upper cylinder.

[0011] Preferably, a top lifting ear is provided on one side of the top end of the elliptical upper head, and the provision of the top lifting ear facilitates opening the elliptical upper head.

[0012] Preferably, the fourth connecting pipe is provided with a reboiler inlet, the ninth connecting pipe is provided with a tower material inlet, the seventh connecting pipe is provided with a reflux port, the eighth connecting pipe is provided with a tower top material outlet, the fifth connecting pipe is provided with a local pressure gauge port, a remote pressure gauge port and a remote liquid level gauge port, the second connecting pipe is provided with a local thermometer port, a remote thermometer port, a purge port and a remote liquid level gauge port, and the arrangement of the local thermometer port and the remote thermometer port facilitates real-time monitoring of the temperature during the refining process.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The refining tower completes the refining task by switching between light removal and heavy removal in a single tower, and the tower is used for two purposes, which reduces the cost of building a complex refining device. By controlling technical conditions, the light removal and heavy removal operations are changed to achieve effective removal of impurities in the circulating acetonitrile. The crude acetonitrile in the solvent recovery tower is introduced into the solvent refining tower from the ninth connection pipe, and firstly the light removal operation is performed by preliminary heating to remove impurities such as acetone in the crude acetonitrile. In addition, the tower bottom index is guaranteed to be qualified during the light removal process, so that the tower bottom carries as little light components as possible. The liquid level of the reflux tank in the solvent refining tower is kept stable and slightly increased, and the light components are extracted from the eighth connection pipe. After the light impurities in the crude acetonitrile are removed, the light components in the reflux tank at the top of the tower are first drained, and the liquid level of the reflux tank is controlled to be constant, and then the heavy removal operation is performed. The light components are continuously extracted from the eighth connection pipe at the top of the tower. When the acetonitrile content in the tower bottom is lower than 2%, the tower bottom components are extracted to complete the acetonitrile refining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the bottom of the refining tower of the utility model;

[0017] Figure 3 It is a cross-sectional view of the middle part of the refining tower of the utility model;

[0018] Figure 4 It is a cross-sectional view of the top of the refining tower of the utility model.

[0019] In the figure: 1. foundation ring plate; 2. skirt; 3. first connecting pipe; 4. elliptical lower head; 5. second connecting pipe; 6. third connecting pipe; 7. fourth connecting pipe; 8. fifth connecting pipe; 9. sixth connecting pipe; 10. lower cylinder; 11. entry hole; 12. upper cylinder; 13. seventh connecting pipe; 14. top lifting ear; 15. elliptical upper head; 16. eighth connecting pipe; 17. tower top hanging column; 18. platform; 19. pre-welded parts outside the tower; 20. internal components of the tower; 21. ninth connecting pipe; 22. anti-eddy current baffle; 23. tail lifting ear. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] See also Figure 1-4The utility model provides an energy-saving single-tower operating device for separating and recovering refined solvents from carbon five, comprising a skirt seat 2, a lower cylinder 10 is arranged at the top of the skirt seat 2, an upper cylinder 12 is arranged at the top of the lower cylinder 10, an elliptical upper head 15 is arranged at the top of the upper cylinder 12, an eighth connecting pipe 16 is connected to the middle of the top of the elliptical upper head 15, a seventh connecting pipe 13 is connected to one side of the upper cylinder 12, a tower top hanging column 17 is arranged at the top of the upper cylinder 12 away from the seventh connecting pipe 13, a platform 18 is arranged in the middle of the side of the upper cylinder 12 away from the seventh connecting pipe 13, an outer tower pre-weld 19 is arranged at the bottom of the upper cylinder 12 away from the seventh connecting pipe 13, a fifth connecting pipe 8, a fourth connecting pipe 7 and a second connecting pipe 5 are connected to one side of the lower cylinder 10 from top to bottom, and the lower cylinder 10 away from the second connecting pipe 13 is connected to the eighth connecting pipe 16 in sequence. One side of the tube 5 is connected with the ninth connecting pipe 21, the sixth connecting pipe 9 and the third connecting pipe 6 in sequence from top to bottom. The middle part of the lower cylinder 10 is provided with an inlet hole 11. The crude acetonitrile in the solvent recovery tower is introduced into the solvent refining tower from the ninth connecting pipe 21. First, a light component removal operation is performed by preliminary heating to remove impurities such as acetone in the crude acetonitrile. In the process of light component removal, the tower bottom index is guaranteed to be qualified so that the tower bottom carries as little light components as possible. The liquid level of the reflux tank in the solvent refining tower is kept stable and slightly increased. The light components are extracted from the eighth connecting pipe 16. After the light impurities in the crude acetonitrile are removed, the light components in the reflux tank at the top of the tower are first drained, and the liquid level of the reflux tank is controlled to be constant, and then a heavy component removal operation is performed. The light components are continuously extracted from the eighth connecting pipe 16 at the top of the tower. When the acetonitrile content in the tower bottom is lower than 2%, the tower bottom components are extracted to complete the acetonitrile refining process.

[0022] An elliptical lower head 4 is provided at the connection between the lower cylinder 10 and the skirt 2, the middle of the elliptical lower head 4 is connected with a first connecting pipe 3, one end of the first connecting pipe 3 away from the elliptical lower head 4 is provided as a material outlet, an anti-vortex baffle 22 is provided on the inner side of the elliptical lower head 4, and the anti-vortex baffle 22 is provided corresponding to the first connecting pipe 3, a base ring plate 1 is provided at the bottom of the surface of the skirt 2, and a tail lifting ear 23 is provided on one side of the base ring plate 1;

[0023] When in use, the material can be easily discharged through the first pipe 3, the anti-eddy current baffle 22 can generate eddy current during the discharge process, and the basic ring plate 1 can play a reinforcing role;

[0024] The lower cylinder 10 and the upper cylinder 12 are both provided with a tower internal component 20, a top lifting lug 14 is provided on one side of the top of the elliptical upper head 15, a reboiler inlet is provided on the fourth connecting pipe 7, a tower material inlet is provided on the ninth connecting pipe 21, a reflux port is provided on the seventh connecting pipe 13, a tower top material outlet is provided on the eighth connecting pipe 16, a local pressure gauge port, a remote pressure gauge port and a remote liquid level gauge port are provided on the fifth connecting pipe 8, and a local thermometer port, a remote thermometer port, a purge port and a remote liquid level gauge port are provided on the second connecting pipe 5;

[0025] When in use, the top lifting ear 14 is provided to facilitate opening the elliptical upper sealing head 15, and the provision of the local thermometer port and the remote thermometer port facilitates real-time monitoring of the temperature during the refining process.

[0026] When the embodiment of the present application is in use: the refining tower completes the refining task by switching between light removal and heavy removal in a single tower, and a tower is used for two purposes, which reduces the cost of building a complex refining device. By controlling technical conditions, the operations of light removal and heavy removal are changed to achieve effective removal of impurities in the circulating acetonitrile, wherein the crude acetonitrile in the solvent recovery tower is introduced into the solvent refining tower from the ninth connecting pipe 21, and a light removal operation is first performed by preliminary heating to remove impurities such as acetone in the crude acetonitrile, and the tower bottom index is guaranteed to be qualified during the light removal process so that the tower bottom carries as little light components as possible, the reflux tank in the solvent refining tower maintains a stable and slightly rising liquid level, and the light components are extracted from the eighth connecting pipe 16. After the light impurities in the crude acetonitrile are removed, the light components in the reflux tank at the top of the tower are first drained, and the liquid level of the reflux tank is controlled to be constant, and then the heavy removal operation is performed, and the light components are continuously extracted from the eighth connecting pipe 16 at the top of the tower. When the acetonitrile content in the tower bottom is lower than 2%, the tower bottom components are extracted to complete the acetonitrile refining process.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy-saving single-tower operating device for separating and recovering refined solvents from C5, comprising a skirt (2), characterized in that: The top of the skirt (2) is provided with a lower cylinder (10), the top of the lower cylinder (10) is provided with an upper cylinder (12), the top of the upper cylinder (12) is provided with an elliptical upper head (15), the middle of the top of the elliptical upper head (15) is connected to an eighth connecting pipe (16), one side of the upper cylinder (12) is connected to a seventh connecting pipe (13), a tower top suspending column (17) is provided at the top of the side of the upper cylinder (12) away from the seventh connecting pipe (13), and the upper cylinder (12) away from the seventh connecting pipe (13) is provided with a tower top suspending column (17). ) is provided with a platform (18) in the middle of one side; an outer tower pre-weld (19) is provided at the bottom of the upper cylinder (12) on the side away from the seventh pipe (13); one side of the lower cylinder (10) is connected to the fifth pipe (8), the fourth pipe (7) and the second pipe (5) in sequence from top to bottom; the side of the lower cylinder (10) away from the second pipe (5) is connected to the ninth pipe (21), the sixth pipe (9) and the third pipe (6) in sequence from top to bottom; and an entry hole (11) is provided in the middle of the lower cylinder (10).

2. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 1, characterized in that: An elliptical lower head (4) is provided at the connection between the lower cylinder (10) and the skirt (2); the middle of the elliptical lower head (4) is connected to a first connecting pipe (3); and one end of the first connecting pipe (3) away from the elliptical lower head (4) is provided as a material outlet.

3. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 2, characterized in that: An anti-vortex baffle (22) is provided on the inner side of the elliptical lower end cover (4), and the anti-vortex baffle (22) is provided corresponding to the first connecting pipe (3).

4. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 1, characterized in that: A base ring plate (1) is provided at the bottom of the surface of the skirt seat (2), and a tail lifting lug (23) is provided on one side of the base ring plate (1).

5. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 1 is characterized in that: Tower internals (20) are both provided inside the lower cylinder (10) and inside the upper cylinder (12).

6. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 1, characterized in that: A top lifting lug (14) is provided on one side of the top end of the elliptical upper head (15).

7. The energy-saving single-tower operating device for separating and recovering refined solvents from C5 according to claim 1, characterized in that: The fourth connecting pipe (7) is provided with a reboiler inlet, the ninth connecting pipe (21) is provided with a tower material inlet, the seventh connecting pipe (13) is provided with a reflux port, the eighth connecting pipe (16) is provided with a tower top material outlet, the fifth connecting pipe (8) is provided with a local pressure gauge port, a remote pressure gauge port and a remote liquid level gauge port, and the second connecting pipe (5) is provided with a local thermometer port, a remote thermometer port, a purge port and a remote liquid level gauge port.

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