Continuous extractive distillation device
By introducing water extraction process and drying pipe treatment into the extraction and distillation device, the problems of waste of azeotropic agent and the use of cold volume are solved, and the drying treatment of efficient recovery of methanol and ethane gas is achieved, which improves recycling efficiency and safety.
Patent Information
- Application Number
- CN202422325262.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-24
AI Technical Summary
In the existing extraction and distillation equipment, there are a lot of azeotropic agents in the methanol recovery process, which wastes azeotropic agent and uses large cooling capacity, making the recycling efficiency low.
Using a continuous extraction and distillation device, the water extraction process and the principle of non-polar insoluble water are used to separate the mixture of n-hexane and methanol water in the layering tank, absorb the moisture in the ethane gas through the drying tube, and improve the recovery efficiency.
Improves the efficiency of by-product recycling, reduces material losses, and enhances process safety and dryness of ethane gas.
Smart Images
Figure CN223055122U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fine chemical distillation devices, and particularly relates to a continuous extractive distillation device. Background Technique
[0002] Distillation is usually carried out in a distillation column. The gas-liquid two-phase contacts countercurrently for interphase heat and mass transfer. The volatile components in the liquid phase enter the gas phase, and the non-volatile components in the gas phase transfer into the liquid phase. Thus, almost pure volatile components can be obtained at the top of the column, and almost pure non-volatile components can be obtained at the bottom of the column.
[0003] In the prior art, the azeotropic composition of the extractive distillation device is methanol and methyl methacrylate. After being vaporized and cooled by the distillation column, it is extracted and stratified with n-hexane. The upper layer is n-hexane for system reuse, and the lower layer is an azeotropic mixture of n-hexane and methanol, which then enters the azeotropic agent recovery column for distillation and recovery. This process results in too much azeotropic agent in the recovered methanol, wasting the azeotropic agent, consuming a large amount of cooling capacity, and having low recovery efficiency. Content of the Utility Model
[0004] Aiming at the deficiencies of the prior art, the utility model provides a continuous extractive distillation device, which solves the problems of too much azeotropic agent in the recovered methanol, wasting the azeotropic agent, consuming a large amount of cooling capacity, and having low recovery efficiency.
[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A continuous extractive distillation device includes a base and a distillation column. The distillation column is fixedly installed at the upper end of the base. A separation tank is fixedly installed at the upper end of the base and is arranged on the right side wall of the distillation column. An air outlet pipe is fixedly installed between the top surface of the separation tank and the top surface of the distillation column. A water injection pipe is fixedly installed inside the separation tank. A liquid extraction pump is fixedly installed at the upper end of the base. Two ports of the liquid extraction pump are respectively fixedly connected with connecting pipes, and the connecting pipes are respectively fixedly connected to the inner side walls of the separation tank and the distillation column.
[0006] Preferably, an air extraction pipe is fixedly installed inside the right side wall of the separation tank. An air pump is fixedly installed at the upper end of the base. The lower end of the air extraction pipe is fixedly connected to the air extraction end of the air pump, and the upper end pipe orifice of the air extraction pipe is fixedly connected above the separation tank, so as to facilitate the extraction of the distilled ethane gas.
[0007] Preferably, the exhaust end of the air pump is fixedly connected with an exhaust pipe. A drying pipe is fixedly installed on the pipe wall of the exhaust pipe, and the inside of the drying pipe is communicated with the inside of the exhaust pipe, so as to facilitate the drying treatment of the discharged ethane gas.
[0008] Preferably, an opening is provided inside the top surface of the layered tank. A filter screen is slidably connected inside the opening, and the side wall of the filter screen is in close contact with the inner side wall of the layered tank. A sealing plate is fixedly installed at the top of the filter screen. The size of the sealing plate is larger than that of the opening. Fixing bolts are threadedly connected inside both ends of the sealing plate, and the fixing bolts are threadedly connected to the inside of the top surface of the layered tank through the inside of the sealing plate, so that the position of the filter screen can be stably installed.
[0009] Preferably, a pull ring is fixedly installed at the upper end of the sealing plate, which is convenient for lifting the sealing plate, so that it can be conveniently taken out and placed.
[0010] Preferably, anhydrous calcium chloride is placed inside the drying pipe, so as to dehumidify the incoming ethane gas and make the discharged ethane gas dry.
[0011] The utility model provides a continuous extractive distillation device, which has the following beneficial effects:
[0012] 1. When using the continuous extractive distillation device, by using the water extraction process, water is introduced into the layered tank. According to the principle that non-polar substances are insoluble in water, the upper layer is pure n-hexane, and the lower layer is a mixture of methanol and water. The mixture enters the original azeotropic agent recovery tower for distillation. Methanol is taken out from the top of the tower, and water is at the bottom of the tower, which is recycled and introduced into the layered tank. After the process improvement, the recovery efficiency of by-products is greatly improved, the material loss is reduced, and due to the addition of water, the process is safer;
[0013] 2. When using the continuous extractive distillation device, by means of the provided drying pipe, the moisture in the ethane gas can be absorbed by the anhydrous calcium chloride inside, enhancing the dryness of the collected ethane gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 is a schematic diagram of the internal structure of the utility model;
[0016] Figure 3 is the utility model Figure 2 Schematic diagram of part A structure in.
[0017] In the figure, 1 - base, 2 - distillation column, 3 - layered tank, 4 - air pump, 5 - liquid extraction pump, 6 - water injection pipe, 7 - gas outlet pipe, 8 - sealing plate, 9 - air extraction pipe, 10 - drying pipe, 11 - exhaust pipe, 12 - fixing bolt, 13 - filter screen, 14 - pull ring, 15 - opening. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0019] Embodiment 1
[0020] Please refer to Figures 1 - 3 , the embodiment of the present utility model provides a continuous extractive distillation device, including a base 1 and a distillation column 2. The distillation column 2 is fixedly installed at the upper end of the base 1. A separation tank 3 is fixedly installed at the upper end of the base 1, and the separation tank 3 is arranged on the right side wall of the distillation column 2. An air outlet pipe 7 is fixedly installed between the top surface of the separation tank 3 and the top surface of the distillation column 2. A water injection pipe 6 is fixedly installed inside the separation tank 3. A liquid extraction pump 5 is fixedly installed at the upper end of the base 1. Two ports of the liquid extraction pump 5 are respectively fixedly connected with connecting pipes, and the connecting pipes are respectively fixedly connected to the inside of the side wall of the separation tank 3 and the inside of the side wall of the distillation column 2. When the distillation column 2 is performing distillation work, the generated ethane gas enters the inside of the separation tank 3 through the air outlet pipe 7. At the same time, water is injected into the inside of the separation tank 3 by using the water injection pipe 6, so that the lower end in the separation tank 3 is a compound of methanol and water, which can prevent ethane from entering the water and adhering to methanol. Subsequently, the liquid extraction pump 5 is turned on, so that the compound of methanol and water enters the inside of the distillation column 2, which can enhance the distillation efficiency of methanol and make the distilled ethane richer.
[0021] Embodiment 2
[0022] In order to facilitate the discharged ethane gas to be drier, in this embodiment, as Figures 2 - 3 shown, an air extraction pipe 9 is fixedly installed inside the right side wall of the separation tank 3. An air pump 4 is fixedly installed at the upper end of the base 1. The lower end of the air extraction pipe 9 is fixedly connected to the air extraction end of the air pump 4, and the upper end pipe orifice of the air extraction pipe 9 is fixedly connected to the exhaust end of the air pump 4 above the separation tank 3. An exhaust pipe 11 is fixedly installed on the pipe wall of the exhaust pipe 11. A drying pipe 10 is fixedly installed inside the exhaust pipe 11. The inside of the drying pipe 10 is communicated with the inside of the exhaust pipe 11. Anhydrous calcium chloride is placed inside the drying pipe 10. After the distilled ethane gas enters the inside of the separation tank 3, the air pump 4 is turned on, so that the air pump 4 extracts the ethane gas in the separation tank 3, which is convenient for its collection.
[0023] Embodiment 3
[0024] In order to filter the discharged ethane gas, in this embodiment, as Figures 2 - 3As shown in the figure, an opening 15 is provided inside the top surface of the layered tank 3. A filter screen 13 is slidably connected inside the opening 15, and the side wall of the filter screen 13 is in close contact with the inner side wall of the layered tank 3. A sealing plate 8 is fixedly installed at the top of the filter screen 13. The size of the sealing plate 8 is larger than that of the opening 15. Fixing bolts 12 are threadedly connected inside both ends of the sealing plate 8, and the fixing bolts 12 are threadedly connected to the inner part of the top surface of the layered tank 3 through the inside of the sealing plate 8. A pull ring 14 is fixedly installed at the upper end of the sealing plate 8. In order to prevent impurities from existing in the rectified ethane gas, the rectified ethane gas is filtered through the inside of the filter screen 13 and then discharged.
[0025] It should be noted that in this embodiment, when using the continuous extractive distillation device, as Figures 1 - 3 shown in the figure, when the distillation column 2 is performing distillation work, the generated ethane gas enters the inside of the layered tank 3 through the gas outlet pipe 7. At the same time, water is injected into the inside of the layered tank 3 by using the water injection pipe 6, so that the lower end inside the layered tank 3 is a compound of methanol and water, which can prevent ethane from entering the water and adhering to methanol. Subsequently, the liquid extraction pump 5 is turned on, so that the compound of methanol and water enters the inside of the distillation column 2, which can enhance the distillation efficiency of methanol, make the rectified ethane richer and more efficient. When the ethane gas enters the inside of the layered tank 3, the air pump 4 is turned on, so that the air pump 4 pumps out the ethane gas inside the layered tank 3, and the gas is discharged through the inside of the drying pipe 10. The moisture existing in the ethane gas can be absorbed by using anhydrous calcium chloride placed in the drying pipe 11, which is convenient for collecting it.
[0026] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0027] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. The narrative way of this specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A continuous extractive distillation device, characterized in that: It includes a base (1) and a rectifying column (2). The rectifying column (2) is fixedly installed at the upper end of the base (1). A separation tank (3) is fixedly installed at the upper end of the base (1), and the separation tank (3) is arranged on the right side wall of the rectifying column (2). An air outlet pipe (7) is fixedly installed between the top surface of the separation tank (3) and the top surface of the rectifying column (2). A water injection pipe (6) is fixedly installed inside the separation tank (3). A liquid extraction pump (5) is fixedly installed at the upper end of the base (1). Two ports of the liquid extraction pump (5) are respectively fixedly connected with connecting pipes, and the connecting pipes are respectively fixedly connected to the inside of the side wall of the separation tank (3) and the inside of the side wall of the rectifying column (2).
2. The continuous extractive distillation apparatus according to claim 1, characterized in that: An air extraction pipe (9) is fixedly installed inside the right side wall of the separation tank (3). An air pump (4) is fixedly installed at the upper end of the base (1). The lower end of the air extraction pipe (9) is fixedly connected to the air extraction end of the air pump (4), and the upper end pipe orifice of the air extraction pipe (9) is fixedly connected above the separation tank (3).
3. The continuous extractive distillation apparatus according to claim 2, wherein: The exhaust end of the air pump (4) is fixedly connected with an exhaust pipe (11). A drying pipe (10) is fixedly installed on the pipe wall of the exhaust pipe (11), and the inside of the drying pipe (10) is communicated with the inside of the exhaust pipe (11).
4. The continuous extractive distillation apparatus according to claim 2, wherein: An opening (15) is formed inside the top surface of the separation tank (3). A filter screen (13) is slidably connected inside the opening (15), and the side wall of the filter screen (13) is mutually attached to the inner side wall of the separation tank (3). A sealing plate (8) is fixedly installed at the top of the filter screen (13). The size of the sealing plate (8) is larger than the size of the opening (15). Fixing bolts (12) are threadedly connected inside both ends of the sealing plate (8), and the fixing bolts (12) are threadedly connected to the inside of the top surface of the separation tank (3) through the inside of the sealing plate (8).
5. The continuous extractive distillation apparatus according to claim 4, wherein: A pull ring (14) is fixedly installed at the upper end of the sealing plate (8).
6. The continuous extractive distillation apparatus according to claim 3, characterized in that: Anhydrous calcium chloride is placed inside the drying pipe (10).