Low-energy-consumption ionic liquid dewatering device
By introducing a stratification tank, a vertical centrifuge, and an RO membrane water treatment device into the ionic liquid dehydration unit, the high energy consumption problem caused by untreated ionic liquid mixtures was solved, achieving low-energy and high-efficiency water separation.
Patent Information
- Application Number
- CN202422831206.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-20
AI Technical Summary
In existing technologies, ionic liquid mixtures are directly fed into short-path distillers without prior treatment, resulting in problems such as large processing volumes and high energy consumption.
The low-energy ionic liquid dehydration device, consisting of a layered tank, a vertical centrifuge, an RO membrane water treatment system, and a multi-stage condenser, reduces water content and lowers energy consumption by separating and purifying the ionic liquid-white oil mixture.
Through separation and purification, the energy consumption of the ionic liquid dehydration device has been significantly reduced, and the processing efficiency and energy utilization rate have been improved.
Smart Images
Figure CN223504887U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of ionic liquid dehydration devices, and in particular relates to a low-energy-consumption ionic liquid dehydration device. Background Technology
[0002] A conventional short-path still is a device used to separate liquid mixtures by utilizing the difference in boiling points of liquids at different temperatures. A short-path still consists of a heater, a distillation column, and a condenser. During distillation, the mixture is heated and enters the distillation column. As the temperature gradually increases within the column, the components in the mixture gradually boil and evaporate to the top. At the top, the vapor is sent to the condenser, where cooling water condenses the vapor into liquid, ultimately yielding components of varying purities. Short-path stills are typically suitable for separating high-boiling-point mixtures, providing relatively high-purity products in a shorter time.
[0003] During the separation and recovery process of ionic liquid extractants, a large amount of mixed liquid is generated. If this mixed liquid is fed directly into a short-path distiller without treatment, it not only results in a large throughput and reduced efficiency but also high energy consumption. Therefore, there is an urgent need for a low-energy-consumption ionic liquid dehydration device to address the shortcomings of existing technologies. Utility Model Content
[0004] The purpose of this invention is to provide a low-energy-consumption ionic liquid dehydration device to overcome the shortcomings of the existing technology.
[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:
[0006] A low-energy-consumption ionic liquid dehydration device includes: a layered tank, the upper outlet of which is connected to a short-distillation device; the short-distillation device includes: a distillation column, the inlet of which is connected to the upper outlet of the layered tank, the outlet of which is connected to an ionic liquid recovery tank; a heating tube is installed in the distillation column, the inlet of which is connected to the outlet of the distillation column heater, the outlet of which is connected to the return end of the distillation column heater; an outlet is provided at the top of the distillation column, the outlet of which is connected to the inlet of a primary condenser, the outlet of which is connected to the inlet of a secondary condenser; and the outlets of both the primary and secondary condensers are connected to a water recovery tank.
[0007] Furthermore, it also includes: a buffer tank, the inlet end of which is connected to the vertical centrifuge and the RO membrane water treatment equipment; the outlet end of the buffer tank is connected to the inlet end of the heater; the outlet end of the heater is connected to the inlet end of the stratification tank; and the lower outlet end of the stratification tank is connected to the return end of the RO membrane water treatment equipment.
[0008] Furthermore, a liquid pump is also installed on the pipeline between the liquid outlet end of the heating tube and the liquid return end of the distillation column heater.
[0009] Furthermore, the heat transfer medium of the distillation column heater is heat transfer oil.
[0010] The low-energy-consumption ionic liquid dehydration device provided by this utility model has the following advantages compared with the prior art:
[0011] 1. By adjusting the water ratio, the ionic liquid-white oil mixture is separated into layers, and the white oil is separated by a vertical centrifuge, which greatly reduces energy consumption.
[0012] 2. By using RO membrane water treatment equipment, a large amount of purified water is removed, which greatly reduces the amount of ionic liquid aqueous solution that needs to be treated later, thus reducing energy consumption;
[0013] 3. By adding a stratified tank to treat the mixture, the water content in the mixture is reduced, thus reducing the amount of water that needs to be removed by short-term evaporation and lowering energy consumption. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] In the diagram: 1-Vertical centrifuge, 2-RO membrane water treatment equipment, 3-Short evaporation equipment, 4-Buffer tank, 5-Heater, 6-Separation tank, 7-Distillation column heater, 8-Distillation column, 9-First-stage condenser, 10-Second-stage condenser, 11-Water recovery tank, 12-Ionic liquid recovery tank. Detailed Implementation
[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments:
[0018] refer to Figure 1As shown, this utility model provides a low-energy-consumption ionic liquid dehydration device, including: a layered tank 6, the upper outlet of which is connected to a short-distillation device 3; the short-distillation device 3 includes: a distillation column 8, the inlet of which is connected to the upper outlet of the layered tank 6, and the outlet of which is connected to an ionic liquid recovery tank 12; a heating tube is provided in the distillation column 8, the inlet of which is connected to the outlet of a distillation column heater 7, and the outlet of which is connected to the return end of the distillation column heater 7; an outlet is provided at the top of the distillation column 8, which is connected to the inlet of a primary condenser 9; the outlet of the primary condenser 9 is connected to the inlet of a secondary condenser 10; and the outlets of both the primary condenser 9 and the secondary condenser 10 are connected to a water recovery tank 11. By adding the layered tank 6, the mixture is treated, reducing the water content in the mixture, thus reducing the amount of water that needs to be removed by short-distillation and lowering energy consumption.
[0019] In a preferred embodiment, the system further includes a buffer tank 4, the inlet of which is connected to the vertical centrifuge 1 and the RO membrane water treatment device 2; the outlet of the buffer tank 4 is connected to the inlet of the heater 5; the outlet of the heater 5 is connected to the inlet of the stratification tank 6; and the lower outlet of the stratification tank 6 is connected to the return end of the RO membrane water treatment device 2. By removing a large amount of purified water through the RO membrane water treatment device 2, the amount of ionic liquid aqueous solution that needs to be treated later is greatly reduced, thus lowering energy consumption.
[0020] In a preferred embodiment, a liquid pump is also provided on the pipeline between the liquid outlet end of the heating tube and the liquid return end of the distillation column heater 7.
[0021] In a preferred embodiment, the heat transfer medium of the distillation column heater 7 is heat transfer oil.
[0022] The working process and principle of this utility model are as follows:
[0023] After the ionic liquid extractant undergoes the extraction process, it produces an ionic liquid-white oil mixture and an ionic liquid-water mixture. Then, through the ionic liquid extractant separation and recovery process, the extractant, white oil, and water in the mixture are separated and re-entered into the extraction process.
[0024] The ionic liquid-white oil mixture enters vertical centrifuge 1, and water is added in a certain proportion. Through multi-stage centrifugation, a light phase-white oil and a heavy phase-ionic liquid aqueous solution can be obtained. The light phase is collected and reused, and the heavy phase enters buffer tank 4 for the next step.
[0025] The ionic liquid-water mixture is purified by a multi-stage RO membrane water treatment device 2. The mixture is then concentrated in multiple stages through a reverse osmosis membrane to obtain purified water with COD < 500 mg / L and a high-concentration ionic liquid aqueous solution. The purified water can be reused in the extraction and washing process, while the concentrated water enters the buffer tank 4 to await the next step.
[0026] After the heavy phase and concentrated water in buffer tank 4 are mixed, they are preheated by heater 5 and then enter the stratification tank 6. When the ratio of ionic liquid to water exceeds a certain proportion, rapid and obvious stratification will occur as the temperature rises. In stratification tank 6, after a short period of settling, two layers are formed: the upper liquid (ionic liquid) contains a small amount of water dissolved in it, and the lower liquid (water) contains a small amount of ionic liquid dissolved in it. The lower heavy phase liquid re-enters the RO membrane water treatment equipment 2 for further purification, while the upper light phase liquid enters the short distillation equipment 3 and is heated by the distillation column heater 7. Low-boiling-point substances evaporate in the distillation column 8 and are cooled in the primary and secondary condensers to form liquid, which then enters the water recovery tank 11. High-boiling-point substances enter the ionic liquid recovery tank 12.
[0027] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0028] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0029] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A low-energy-consumption ionic liquid dehydration device, characterized in that, include: A stratified tank (6) is provided, the upper liquid outlet of which is connected to a short-distillation device (3). The short-distillation device (3) includes a distillation column (8), the liquid inlet of which is connected to the upper liquid outlet of the stratified tank (6), the liquid outlet of which is connected to an ionic liquid recovery tank (12), a heating tube in which is provided, the liquid inlet of which is connected to the liquid outlet of a distillation column heater (7), the liquid outlet of which is connected to the liquid return of a distillation column heater (7), a gas outlet at the top of the distillation column (8), the gas outlet connected to the gas inlet of a primary condenser (9), the gas outlet of the primary condenser (9) connected to the gas inlet of a secondary condenser (10), and the liquid outlets of both the primary condenser (9) and the secondary condenser (10) connected to a water recovery tank (11).
2. The low-energy-consumption ionic liquid dehydration device according to claim 1, characterized in that, Also includes: The buffer tank (4) is connected to the vertical centrifuge (1) and the RO membrane water treatment equipment (2) at its inlet end, and to the heater (5) at its outlet end. The heater (5) at its outlet end is connected to the stratification tank (6) at its inlet end, and the stratification tank (6) at its lower outlet end is connected to the RO membrane water treatment equipment (2) at its return end.
3. The low-energy-consumption ionic liquid dehydration device according to claim 1, characterized in that, A liquid pump is also installed on the pipeline between the liquid outlet end of the heating tube and the liquid return end of the distillation column heater (7).
4. The low-energy-consumption ionic liquid dehydration device according to claim 1, characterized in that, The heat transfer medium of the distillation tower heater (7) is heat transfer oil.