Separation and recovery device for chemical production
By designing a separation and recovery unit that includes an azeotropic distillation column, an extractive distillation column, and a solvent recovery column, the problem of low reuse efficiency of extractant NMP in traditional units was solved, achieving efficient purification and reuse of extractant NMP and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional chemical production separation and recovery equipment does not have the function of purifying the extractant NMP, resulting in low reuse efficiency of extractant NMP and excessively high production costs.
A separation and recovery device comprising an azeotropic distillation column, an extractive distillation column, and a solvent recovery column was designed. By combining a water ring vacuum unit, a plate heat exchanger, and an evaporation-condensation system, the extraction agent NMP is purified and reused, thereby improving its reusability.
By combining a solvent recovery tower and an evaporation and condensation system, the efficient purification and reuse of the extractant NMP were achieved, reducing production costs.
Smart Images
Figure CN224009060U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the chemical technical field, concretely relates to a separation and recovery device for chemical production. BACKGROUND
[0002] Hexamethyldisiloxane is an organic compound with the chemical formula C6H18OSi2, which is a colorless transparent liquid, insoluble in water, soluble in most organic solvents, and mainly used as a sealant, cleaning agent, release agent, and organic synthesis intermediate. Photoinitiator TPO is a high-efficiency free radical (1) type photoinitiator with absorption in a long wavelength range.
[0003] To obtain qualified hexamethyldisiloxane product, the ternary azeotrope of hexamethyldisiloxane, toluene, and water needs to be extracted. An extractant NMP needs to be added to the inside of the extraction rectification tower during extraction. The traditional separation and recovery device for chemical production does not have the function of purifying the extractant NMP, resulting in low reuse efficiency of the extractant NMP and high production cost. SUMMARY
[0004] To solve the problems raised in the background art, the utility model provides a separation and recovery device for chemical production, which solves the problems of the traditional separation and recovery device for chemical production not having the function of purifying the extractant NMP, low reuse efficiency of the extractant NMP, and high production cost.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a separation and recovery device for chemical production, comprising a support table, an azeotropic rectification tower, an extraction rectification tower, and a solvent recovery tower. The positions of the azeotropic rectification tower, the extraction rectification tower, and the solvent recovery tower correspond to each other. A water ring vacuum unit is arranged on one side of the surface of the support table, and the other two ends of the water ring vacuum unit are respectively connected to the interiors of the extraction rectification tower and the solvent recovery tower. A reflux condenser pipe is connected to the interior of one side of the azeotropic rectification tower. A plate heat exchanger is arranged in the interior of the extraction rectification tower. A liquid discharge pipe is connected to the interior of one side of the extraction rectification tower. A liquid valve is arranged on one side of the surface of the liquid discharge pipe. A shell-and-tube heat exchanger is connected to one side of the interior of the azeotropic rectification tower. A connecting block is fixedly connected to one side of the inner surface of the azeotropic rectification tower. A condenser is connected to one side of the connecting block. An evaporation condensation system is arranged in the interior of the solvent recovery tower.
[0006] Preferably, a first connecting pipe is connected to the interior of one end of the azeotropic rectification tower, and the other end of the first connecting pipe is connected to the interior of one end of the extraction rectification tower. A first valve is arranged on the surface of the middle part of the first connecting pipe.
[0007] Preferably, the support leg is fixedly connected to the bottom of the support platform, and the bottom of the support leg is fixedly connected with a support base.
[0008] Preferably, the second connecting pipe is connected to one end of the extractive rectifying tower, and the other end of the second connecting pipe is connected to the inside of one side of the azeotropic rectifying tower.
[0009] Preferably, the first flow guide pipe is connected to the other end of the extractive rectifying tower, and the other end of the first flow guide pipe is connected to the inside of one side of the solvent recovery tower.
[0010] Preferably, the second flow guide pipe is connected to the inside of one side of the extractive rectifying tower, and the other end of the second flow guide pipe is connected to the other side of the extractive rectifying tower.
[0011] Preferably, the liquid injection pipe is connected to one side of the inside of the tube-shell heat exchanger, and the other end of the liquid injection pipe is connected with a pipeline filter penetrating one end of the inside of the azeotropic rectifying tower.
[0012] Preferably, the liquid injection port is arranged at the center of the top of the extractive rectifying tower, and the sealing cover is threadedly connected to the surface of the liquid injection port.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] Through the cooperation between the solvent recovery tower and the evaporation condensation system, the extractant NMP and the toluene mixture in the inside of the extractive rectifying tower enter the inside of the solvent recovery tower, and the solvent recovery tower separates them, the toluene product is at the top of the tower, and the extractant NMP is at the bottom of the tower. BRIEF DESCRIPTION OF DRAWINGS
[0015] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model.
[0016] Figure 1 It is the three-dimensional structure diagram of the utility model;
[0017] Figure 2 It is the schematic diagram of the water ring vacuum unit of the utility model;
[0018] Figure 3 It is the sectional view of the utility model;
[0019] Figure 4 It is a schematic view of the evaporation condensing system of the utility model.
[0020] Figure 5 It is a schematic view of the tube shell heat exchanger of the utility model.
[0021] In the figure: 1, support table; 2, azeotropic distillation column; 3, extractive distillation column; 4, solvent recovery tower; 5, reflux condenser; 6, connecting ring; 7, support base; 8, water ring vacuum unit; 9, support leg; 10, liquid valve; 11, liquid discharge pipe; 12, plate heat exchanger; 13, first valve; 14, first connecting pipe; 15, pipeline filter; 16, second valve; 17, second connecting pipe; 18, liquid injection port; 19, sealing cover; 20, first check valve; 21, first flow guide pipe; 22, evaporation condensing system; 23, second flow guide pipe; 24, second check valve; 25, tube shell heat exchanger; 26, condenser; 27, connecting block; 28, liquid injection pipe. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0023] Please refer to Figures 1-5 The utility model provides the following technical scheme: a kind of separation and recovery device for chemical production, including support table 1, azeotropic distillation column 2, extractive distillation column 3 and solvent recovery tower 4, the position of azeotropic distillation column 2, extractive distillation column 3 and solvent recovery tower 4 between each other correspond, and water ring vacuum unit 8 is arranged on the side of the surface of support table 1, and the other two ends of water ring vacuum unit 8 are connected with the inside of extractive distillation column 3 and solvent recovery tower 4 respectively, reflux condenser 5 is connected in the inside of the side of azeotropic distillation column 2, plate heat exchanger 12 is provided in the inside of extractive distillation column 3, extractive distillation column 3 side inside is connected with liquid discharge pipe 11, liquid valve 10 is arranged on the side of the surface of liquid discharge pipe 11, azeotropic distillation column 2 inside one side is connected with tube shell heat exchanger 25, azeotropic distillation column 2 inner surface one side is fixedly connected with connecting block 27, connecting block 27 one side is connected with condenser 26, and solvent recovery tower 4 is provided with evaporation condensing system 22 in the inside.
[0024] In the embodiment, the azeotropic distillation column 2, the extractive distillation column 3 and the solvent recovery column 4 are arranged in sequence according to the process flow on the surface of the support table 1, the positions of which correspond to each other, the pipeline connection path is short, the material transmission resistance is reduced, the energy consumption is reduced, and the transmission efficiency is improved.
[0025] In the embodiment, the support base 7 can expand the contact area of the support legs 9 with the ground, and the positions of the support legs 9 correspond to each other, so as to ensure the stability of the high tower equipment under negative pressure and high temperature conditions and prevent vibration deviation.
[0026] In the embodiment, independent valves are arranged between the first connecting pipe 14, the second connecting pipe 17, the first flow guide pipe 21 and the second flow guide pipe 23, respectively, the first connecting pipe 14, the second connecting pipe 17, the first flow guide pipe 21 and the second flow guide pipe 23 are independently controlled and adjusted through the independent valves, so as to not interfere with each other, facilitate the operation of the staff and improve the accuracy of the control.
[0027] In the embodiment, the evaporative condensation system 22 can purify and reuse the extractant NMP, improve the utilization efficiency of the extractant NMP and reduce the production cost.
[0028] The working principle and usage process of this utility model are as follows: After the utility model is installed, the water ring vacuum unit 8 is turned on to establish negative pressure for the extractive distillation column 3 and the solvent recovery column 4. Crude toluene is injected into the azeotropic distillation column 2 through the injection pipe 28. The shell-and-tube heat exchanger 25 is started. Before entering the injection pipe 28, the crude toluene is filtered by the pipeline filter 15. The filtered crude toluene enters the shell-and-tube heat exchanger 25 and exchanges heat with the material inside the azeotropic distillation column 2. After the heat exchange is completed, the azeotropic distillation column 2... At the top of distillation column 2, a ternary azeotrope of hexamethyldisiloxane, toluene, and water is obtained. First valve 13 is opened, and then condenser 26 is started to condense the ternary azeotrope of hexamethyldisiloxane, toluene, and water into a liquid phase. The organic phase of the liquid ternary azeotrope of hexamethyldisiloxane, toluene, and water is refluxed back to the bottom of azeotropic distillation column 2 through reflux condenser 5, while the other portion enters the bottom of extractive distillation column 3 through first connecting pipe 14. The sealing cap 19 is manually unscrewed, and the extractant NMP is injected through the liquid injection line. The feed is injected into the extractive distillation column 3 through port 18. A high concentration of toluene is obtained at the bottom of the extractive distillation column 3. Then, the plate heat exchanger 12 is started to exchange heat between the toluene and the feed. After heat exchange, the liquid valve 10 is turned to collect the toluene through the drain pipe 11. The second valve 16 is opened, and the material at the top of the azeotropic distillation column 2 enters the extractive distillation column 3 through the second connecting pipe 17. A mixture of hexamethyldisiloxane and water is obtained at the top of the extractive distillation column 3. After cooling and phase separation, qualified hexamethyldisiloxane is obtained. The silicon ether product is obtained at the bottom of the extractive distillation column 3, which contains a mixture of toluene and extractant NMP. After opening the first check valve 20, the solvent recovery column 4 yields qualified toluene at the top and extractant NMP at the bottom. After opening the second check valve 24, the extractant NMP returns to the interior of the extractive distillation column 3 through the second guide pipe 23. After multiple cycles, the evaporation and condensation system is started to purify the extractant NMP. After purification, it is recycled again. All electrical equipment in this unit is powered by an external power source.
[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A separation and recovery device for chemical production, comprising a support platform (1), an azeotropic distillation column (2), an extractive distillation column (3), and a solvent recovery column (4), characterized in that: The positions of the azeotropic distillation column (2), the extractive distillation column (3), and the solvent recovery column (4) correspond to each other. A water ring vacuum unit (8) is provided on one side of the surface of the support platform (1), and the other two ends of the water ring vacuum unit (8) are respectively connected to the interior of the extractive distillation column (3) and the solvent recovery column (4). A reflux condenser (5) is connected to the interior of one side of the azeotropic distillation column (2). A plate heat exchanger (12) is provided inside the extractive distillation column (3). A drain pipe (11) is connected to the interior of one side of the extractive distillation column (3). A liquid valve (10) is provided on one side of the surface of the drain pipe (11). A shell-and-tube heat exchanger (25) is connected to one side of the interior of the azeotropic distillation column (2). A connecting block (27) is fixedly connected to one side of the inner surface of the azeotropic distillation column (2). A condenser (26) is connected to one side of the connecting block (27). An evaporation and condensation system (22) is provided inside the solvent recovery column (4).
2. The separation and recovery device for chemical production according to claim 1, characterized in that: The azeotropic distillation column (2) is internally connected to a first connecting pipe (14) at one end, and the other end of the first connecting pipe (14) is connected to the interior of one end of the extractive distillation column (3). A first valve (13) is provided in the middle of the surface of the first connecting pipe (14).
3. The separation and recovery device for chemical production according to claim 1, characterized in that: Support legs (9) are fixedly connected to the bottom of the support platform (1) around its perimeter, and a support base (7) is fixedly connected to the bottom of the support legs (9).
4. The separation and recovery device for chemical production according to claim 1, characterized in that: One end of the extractive distillation column (3) is connected to a second connecting pipe (17), and the other end of the second connecting pipe (17) is connected to the interior of one side of the azeotropic distillation column (2). A second valve (16) is provided in the middle of the surface of the second connecting pipe (17).
5. A separation and recovery device for chemical production according to claim 1, characterized in that: The other end of the extractive distillation column (3) is connected to a first guide pipe (21), and the other end of the first guide pipe (21) is connected to the interior of one side of the solvent recovery column (4). A first check valve (20) is provided in the middle of the surface of the first guide pipe (21).
6. A separation and recovery device for chemical production according to claim 1, characterized in that: The extraction distillation column (3) is internally connected to a second guide pipe (23) on one side, and the other end of the second guide pipe (23) is connected to the other side of the extraction distillation column (3). A second check valve (24) is provided in the middle of the surface of the second guide pipe (23).
7. A separation and recovery device for chemical production according to claim 1, characterized in that: One side of the shell-and-tube heat exchanger (25) is connected to a liquid injection pipe (28). One end of the liquid injection pipe (28) passes through the interior of the azeotropic distillation column (2) and is connected to a pipeline filter (15). One side of the surface of the pipeline filter (15) is connected to a connecting ring (6).
8. A separation and recovery device for chemical production according to claim 1, characterized in that: The extraction distillation column (3) has a liquid injection port (18) at the center of the top, and a sealing cap (19) is threaded onto the surface of the liquid injection port (18).