Vacuum solvent recovery system
By using a vacuum environment and multiple distillation devices in the solvent recovery system, the problem of organic residue degradation caused by solvent recovery at high temperatures in the existing technology is solved, and high-quality solvent recovery and equipment protection are achieved.
Patent Information
- Application Number
- CN202323384474.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2033-12-12
AI Technical Summary
When the existing solvent recovery device recovers the solvent at high temperature, it causes organic residues to degrade and produce gas, causing the solvent to fail and the equipment to corrosion.
Design a vacuum solvent recovery system that uses a primary distillation device and a secondary distillation device to use the vacuum environment to reduce the boiling point of the solvent, prevent the degradation of organic residues, and further improve the quality of the solvent through secondary distillation.
Recycling the solvent in a vacuum environment reduces the solvent distillation temperature, prevents the degradation of organic residues, ensures the quality of the recovered solvent, and reduces equipment corrosion.
Smart Images
Figure CN222368371U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solvent recovery, in particular to a vacuum solvent recovery system. Background Art
[0002] The existing solvent recovery device uses normal pressure and high temperature to recover the solvent, which requires a high-temperature heat carrier of more than 100°C to reach the boiling point of the solvent. The organic residue in the solvent will degrade at this high temperature to produce many gases, such as hydrogen sulfide, etc. These degradation gases easily enter the solvent to form new impurities, resulting in unqualified recovered solvents, and easily causing corrosion of equipment and devices, resulting in safety hazards and economic losses. Therefore, it is necessary to research and develop new solvent recovery methods. Utility Model Content
[0003] The utility model aims to design a vacuum solvent recovery system, so as to prevent organic residues in the solvent from being degraded, ensure the quality of the recovered solvent and reduce the corrosion to the equipment.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A vacuum solvent recovery system comprises a primary distillation device and a secondary distillation device, wherein the primary distillation device is connected to a vacuum pipe and an exhaust pipe 1, and the primary distillation device is connected to the secondary distillation device via a connecting pipe; the connecting pipe is connected to a vacuum balance pipe and an exhaust pipe 2; and corresponding valves are respectively arranged on each pipeline in the system.
[0006] Furthermore, in the above-mentioned vacuum solvent recovery system, the primary distillation device includes a distillation kettle, a distillation tower and a condensation tower connected in sequence, the distillation kettle is connected to a heat carrier pipe, a feed pipe and a sewage pipe, the condensation tower is connected to a refrigerant inlet pipe and a refrigerant outlet pipe, and the condensation tower is connected to the vacuum pipe and the emptying pipe.
[0007] Furthermore, in the above-mentioned vacuum solvent recovery system, the condensation tower 1 is connected to the vacuum pipe and the exhaust pipe 1 by connecting the exhaust gas recovery pipe, the exhaust gas recovery pipe is connected to the refrigerant inlet pipe 2 and the refrigerant outlet pipe 2, and the exhaust gas recovery pipe is connected to the distillation kettle 1 through the recovery pipe.
[0008] Furthermore, in the above-mentioned vacuum solvent recovery system, a U-shaped tube 1 is provided on the recovery tube, and a U-shaped tube 2 is provided on the connecting tube.
[0009] Furthermore, in the above-mentioned vacuum solvent recovery system, a reflux ratio controller 1 is provided between the distillation tower 1 and the condensation tower 1, and the primary distillation device is connected to the connecting pipe through the reflux ratio controller 1.
[0010] Furthermore, in the above-mentioned vacuum solvent recovery system, the secondary distillation device includes a second distillation kettle, a second distillation tower and a second condensation tower connected in sequence, the second distillation kettle is connected to a second heat carrier pipe and a second sewage pipe, the second condensation tower is connected to a tap water inlet pipe and a tap water outlet pipe, the secondary distillation device is connected to a finished product collection pipe, and the finished product collection pipe is connected to a collection tank.
[0011] Furthermore, in the above-mentioned vacuum solvent recovery system, a reflux ratio controller 2 is provided between the distillation tower 2 and the condensation tower 2, the finished product collecting pipe includes a finished product collecting pipe 1 and a finished product collecting pipe 2, the reflux ratio controller 2 is connected to the finished product collecting pipe 1, and the distillation kettle 2 is connected to the finished product collecting pipe 2.
[0012] Furthermore, in the above-mentioned vacuum solvent recovery system, a U-shaped tube three is provided on the finished product collecting tube one.
[0013] Furthermore, in the above-mentioned vacuum solvent recovery system, the secondary distillation device is connected to the connecting pipe through the second condensation tower.
[0014] Furthermore, in the above-mentioned vacuum solvent recovery system, each device in the primary distillation device and the secondary distillation device is respectively provided with a thermometer electrically connected to the PLC.
[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a vacuum solvent recovery system, in which a single distillation is performed in a vacuum environment, so that the boiling point of the solvent is reduced, and thus the temperature required for solvent distillation is reduced, so that a lower temperature heat carrier can be used for heating, thereby preventing organic residues in the solvent from being degraded by high temperature, ensuring the quality of the recovered solvent, and reducing corrosion to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a system schematic diagram of the utility model;
[0018] The names of the components marked in the figure are as follows:
[0019] 11. Distillation kettle one; 12. Distillation kettle two; 21. Distillation tower one; 22. Distillation tower two; 31. Condensation tower one; 32. Condensation tower two; 4. Tail gas recovery pipe; 5. U-shaped tube one; 6. U-shaped tube two; 7. U-shaped tube three. DETAILED DESCRIPTION
[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.
[0021] Example: Please refer to Figure 1 A vacuum solvent recovery system includes a primary distillation device and a secondary distillation device. The primary distillation device includes a distillation kettle 11, a distillation tower 21 and a condensation tower 31 connected in sequence, and the secondary distillation device includes a distillation kettle 12, a distillation tower 22 and a condensation tower 32 connected in sequence.
[0022] The distillation kettle 11 is connected to a heat carrier pipe 1, a feed pipe and a sewage pipe 1. Hot water is passed through the heat carrier pipe 1, and the temperature in the distillation kettle 11 can be adjusted by adjusting the temperature of the hot water. The feed pipe is passed with a solvent to be recovered. The sewage pipe 1 is used to discharge the separated waste. The distillation kettle 11 is connected to a rectifying tower 21 above, and the rectifying tower 21 is connected to a condensing tower 31 above. A reflux ratio controller 1 is provided between the rectifying tower 21 and the condensing tower 31, and the reflux ratio controller 1 is connected to the condensing tower 31 above and the rectifying tower 21 below. The condensing tower 31 is connected to a refrigerant inlet pipe 1 and a refrigerant outlet pipe 1, so as to facilitate the liquefaction of the solvent gas in the condensing tower 31. The tail gas recovery pipe 4 is connected to the tail gas recovery pipe 4 above, and the solvent gas escaping from the condensing tower enters the tail gas recovery pipe 4. The tail gas recovery pipe 4 is connected to a refrigerant inlet pipe 2 and a refrigerant outlet pipe 2, so as to facilitate the liquefaction of the solvent gas in the tail gas recovery pipe 4. The condensation tower 31 is connected to the vacuum pipe and the exhaust pipe 1 by connecting the tail gas recovery pipe 4. Specifically, the vacuum pipe and the exhaust pipe 1 are connected to the tail gas recovery pipe 4 respectively. Since the tail gas recovery pipe 4 is connected to the condensation tower 31, the condensation tower 31 is connected to the vacuum pipe and the exhaust pipe 1. The tail gas recovery pipe 4 is connected to the distillation kettle 11 through the recovery pipe. Specifically, the recovery pipe is connected to the distillation kettle 11. Since the tail gas recovery pipe 4 is connected to the recovery pipe, the tail gas recovery pipe 4 is connected to the distillation kettle 11. A U-shaped pipe 5 is provided on the recovery pipe.
[0023] The second distillation kettle 12 is connected to the second heat carrier pipe, the second sewage pipe and the second finished product collection pipe. Water vapor is passed through the second heat carrier pipe. The second sewage pipe is used to discharge the separated waste. The second finished product collection pipe is connected to the collection tank. The second distillation kettle 12 is connected to the second distillation tower 22 above, and the second distillation tower 22 is connected to the second condensation tower 32 above. A reflux ratio controller 2 is provided between the second distillation tower 22 and the second condensation tower 32. The reflux ratio controller 2 is connected to the second condensation tower 32 above and the second distillation tower 22 below. The reflux ratio controller 2 is connected to the first finished product collection pipe, and the first finished product collection pipe is connected to the collection tank. A U-shaped pipe 3 7 is provided on the first finished product collection pipe. The second condensation tower 32 is connected to the tap water inlet pipe and the tap water outlet pipe, so as to facilitate the liquefaction of the solvent gas in the second condensation tower 32.
[0024] The primary distillation device and the secondary distillation device are connected via a connecting pipe, specifically: the reflux ratio controller 1 in the primary distillation device is connected to the connecting pipe, and the condensation tower 2 32 in the secondary distillation device is connected to the connecting pipe.
[0025] The connecting pipe connects the vacuum balance pipe and the exhaust pipe 2.
[0026] A U-shaped tube 2 6 is provided on the connecting pipe between the reflux ratio controller 1 and the condensation tower 2 32 .
[0027] Thermometer 1 is provided in the distillation kettle 11, thermometer 2 is provided in the distillation tower 1 21, thermometer 3 is provided in the condensation tower 1 31, thermometer 4 is provided in the distillation kettle 2 12, thermometer 5 is provided in the distillation tower 2 22, and thermometer 6 is provided in the condensation tower 2 32. Thermometer 1, thermometer 2, thermometer 3, thermometer 4, thermometer 5 and thermometer 6 are electrically connected to the PLC respectively, and the opening and closing of each device are controlled by monitoring the temperature in each device.
[0028] Each pipeline is provided with a corresponding valve, specifically: a heat carrier valve 1 is provided on the heat carrier pipe 1, a feed valve is provided on the feed pipe, a drain valve 1 is provided on the drain pipe 1, a coolant inlet valve 1 is provided on the coolant inlet pipe 1, a coolant circuit valve 1 is provided on the coolant outlet pipe 1, a coolant inlet valve 2 is provided on the coolant inlet pipe 2, a coolant circuit valve 2 is provided on the coolant outlet pipe 2, a vacuum valve is provided on the vacuum pipe, a drain valve 1 is provided on the drain pipe 1, a recovery valve is provided on the recovery pipe, a connection valve is provided on the connecting pipe, a tap water inlet valve is provided on the tap water inlet pipe, a tap water circuit valve is provided on the tap water outlet pipe, a finished product collecting valve 1 is provided on the finished product collecting pipe 1, a finished product collecting valve 2 is provided on the finished product collecting pipe 2, a heat carrier valve 2 is provided on the heat carrier pipe 2, a drain valve 2 is provided on the drain pipe 2, a vacuum balance valve is provided on the vacuum balance pipe, and a drain valve 2 is provided on the drain pipe 2. Drain valve 1 and drain valve 2 are normally open, and other valves are normally closed. When the primary distillation device is working, the drain valve 1 is closed; when the secondary distillation device is working, the drain valve 2 is opened.
[0029] The working process of a vacuum solvent recovery system provided in this embodiment is as follows: check and ensure that all electrical equipment and valves to be used are in a safe state of use, turn on the power supply; open the refrigerant inlet valve 1, the refrigerant loop valve 1, the refrigerant inlet valve 2, the refrigerant loop valve 2, the tap water inlet valve, and the tap water loop valve; close the drain valve 1 and the drain valve 2; open the vacuum valve and the recovery valve; open the vacuum balance valve; close the finished product collection valve 1 and the finished product collection valve 2; set the upper temperature limit of the thermometer 3 (no lower temperature limit is set); open the feed valve; open the heat carrier valve 1; set the reflux ratio of the reflux ratio controller 1; when After detecting that the finished product of a single distillation (the solvent collected by distillation kettle 2 12) is qualified, close the connecting valve, open the drain valve 2, open the finished product collecting valve 2, and the finished product enters the collecting tank from the finished product collecting pipe 2 through the distillation kettle 2 12 to complete the recovery of the solvent; when detecting that the finished product of a single distillation (the solvent collected by distillation kettle 2 12) is unqualified, close the connecting valve, open the drain valve 2, set the upper temperature limit of thermometer 6 (without setting the lower temperature limit), open the heat carrier valve 2, set the reflux ratio of the reflux ratio controller 2, open the finished product collecting valve 1, and the finished product enters the collecting tank from the finished product collecting pipe 1 through the reflux ratio controller 2 to complete the recovery of the solvent.
[0030] Working principle of this embodiment: This embodiment provides a vacuum solvent recovery system. After the solvent undergoes distillation, rectification and condensation under vacuum in the primary distillation device, it enters the secondary distillation device. The secondary distillation device uses normal pressure. If the finished product of the primary distillation is qualified, secondary distillation is not required. The finished product (via distillation kettle 12) directly enters the collection tank from the finished product collection pipe; if the finished product of the primary distillation is unqualified, secondary distillation is required. After the finished product undergoes distillation, rectification and condensation under normal pressure in the secondary distillation device, it enters the collection tank from the finished product collection pipe. In the vacuum solvent recovery system, the primary distillation is carried out in a vacuum environment, so that the boiling point of the solvent is reduced, and then the temperature required for solvent distillation is reduced, so that a lower temperature heat carrier can be used for heating, preventing the organic residue in the solvent from being degraded by high temperature, ensuring the quality of the recovered solvent, and reducing corrosion to the equipment. Further, the tail gas recovery pipe 44 recovers the solvent in the tail gas, thereby improving the solvent recovery rate. Further, each thermometer is connected through a PLC to realize the control automation of each device.
[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only.
[0032] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A vacuum solvent recovery system, characterized in that: It includes a primary distillation device and a secondary distillation device, the primary distillation device is connected to a vacuum pipe and an exhaust pipe 1, the primary distillation device and the secondary distillation device are connected through a connecting pipe; the connecting pipe is connected to a vacuum balance pipe and an exhaust pipe 2; and corresponding valves are respectively provided on each pipeline in the system.
2. The vacuum solvent recovery system according to claim 1, characterized in that: The single distillation device comprises a distillation kettle (11), a distillation tower (21) and a condensation tower (31) which are connected in sequence, wherein the distillation kettle (11) is connected to a heat carrier pipe (1), a feed pipe and a sewage pipe (1), the condensation tower (31) is connected to a refrigerant inlet pipe (1) and a refrigerant outlet pipe (1), and the condensation tower (31) is connected to the vacuum pipe and the exhaust pipe (1).
3. The vacuum solvent recovery system according to claim 2, characterized in that: The condensation tower 1 (31) is connected to the vacuum pipe and the exhaust pipe 1 by connecting the tail gas recovery pipe (4), the tail gas recovery pipe (4) is connected to the refrigerant inlet pipe 2 and the refrigerant outlet pipe 2, and the tail gas recovery pipe (4) is connected to the distillation kettle 1 (11) through the recovery pipe.
4. The vacuum solvent recovery system according to claim 3, characterized in that: The recovery pipe is provided with a U-shaped pipe 1 (5), and the connecting pipe is provided with a U-shaped pipe 2 (6).
5. The vacuum solvent recovery system according to claim 2, characterized in that: A reflux ratio controller 1 is provided between the distillation tower 1 (21) and the condensation tower 1 (31), and the primary distillation device is connected to the connecting pipe through the reflux ratio controller 1.
6. The vacuum solvent recovery system according to claim 1, characterized in that: The secondary distillation device comprises a second distillation kettle (12), a second distillation tower (22) and a second condensation tower (32) which are connected in sequence, the second distillation kettle (12) is connected to a second heat carrier pipe and a second sewage pipe, the second condensation tower (32) is connected to a tap water inlet pipe and a tap water outlet pipe, the secondary distillation device is connected to a finished product collection pipe, and the finished product collection pipe is connected to a collection tank.
7. The vacuum solvent recovery system according to claim 6, characterized in that: A reflux ratio controller 2 is provided between the distillation tower 2 (22) and the condensation tower 2 (32), the finished product collecting pipe comprises a finished product collecting pipe 1 and a finished product collecting pipe 2, the reflux ratio controller 2 is connected to the finished product collecting pipe 1, and the distillation kettle 2 (12) is connected to the finished product collecting pipe 2.
8. The vacuum solvent recovery system according to claim 7, characterized in that: The finished product collecting pipe one is provided with a U-shaped pipe three (7).
9. The vacuum solvent recovery system according to claim 6, characterized in that: The secondary distillation device is connected to the connecting pipe through the second condensation tower (32).
10. The vacuum solvent recovery system according to claim 1, characterized in that: Each device in the primary distillation device and the secondary distillation device is respectively provided with a thermometer electrically connected to the PLC.