Double-tower deacidification device
The chlorinated vinyl carbonate mixture was subjected to continuous deacidation and removal of dichlorinated vinyl carbonate through the double tower deacidization device, which solved the problem of increased cost and unstable purification process during the synthesis process, and achieved more efficient treatment and cost reduction.
Patent Information
- Application Number
- CN202421338710.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The reaction of the dichlorovinyl carbonate dichlorovinyl carbonate mixed solution with the fluorinating agent increases production cost, and the difluorovinyl carbonate is unstable, affecting the purification process.
The double-tower deacidization device is used to continuously deacidize the chlorinated vinyl carbonate mixture, and at the same time remove dichlorinated vinyl carbonate, and the treatment efficiency is improved through the continuous operation of the two distillation towers.
It effectively reduces production costs, reduces the adverse effects of the post-purification process, and improves the treatment efficiency, reducing the content of vinyl dichlorocarbonate from 8% to 3 to 4%.
Smart Images
Figure CN222585593U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of deacidification devices, in particular to a double-tower deacidification device. Background Art
[0002] The main synthesis route of vinyl chlorocarbonate is to use vinyl carbonate as raw material and chlorine, sulfuryl chloride, etc. as chlorinating agents, and a chlorination reaction occurs under ultraviolet light to generate vinyl chlorocarbonate and hydrogen chloride. In order to increase the concentration of vinyl chlorocarbonate and make the best use of vinyl carbonate, the chlorinating agent will be added in excess, which will cause part of the vinyl chlorocarbonate to be further chlorinated to generate dichloroethylene carbonate. At the same time, excess chlorinating agent will also remain in the vinyl chlorocarbonate mixed solution.
[0003] Therefore, the use of chloroethylene carbonate mixed solution as a raw material to synthesize fluoroethylene carbonate has the following problems: 1. Dichloroethylene carbonate will react with the fluorinating agent, further increasing the production cost; 2. Difluoroethylene carbonate is unstable, which has an adverse effect on the subsequent purification process. Utility Model Content
[0004] In view of the problems in the prior art, the utility model provides a double-tower deacidification device, which can deacidify a chloroethylene carbonate mixed liquid and remove dichloroethylene carbonate at the same time, thereby avoiding some adverse effects of the subsequent purification process and reducing production costs.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A double-tower deacidification device, comprising:
[0007] A first distillation tower, a first tower still, a second distillation tower, a second tower still, a first collecting tank and a second collecting tank;
[0008] Wherein, the first distillation tower is provided with a liquid inlet, the liquid outlet of the first distillation tower is connected with the liquid inlet of the first tower bottom, the liquid outlet of the first tower bottom is connected with the liquid inlet of the second distillation tower through the first pipeline and the second pipeline respectively, and the liquid inlet of the second distillation tower connected with the second pipeline is higher than the liquid inlet connected with the first pipeline, the liquid outlet of the second distillation tower is connected with the liquid inlet of the second tower bottom, the liquid outlet of the second tower bottom is connected with the first collecting tank, and the gas outlet of the first distillation tower and the gas outlet of the second distillation tower are connected with the second collecting tank.
[0009] The double-tower deacidification device as described above, further, a preheater is provided on the second pipeline, and flanges are provided on the first pipeline and the second pipeline.
[0010] As described above, the double-tower deacidification device, further, the liquid outlet of the first tower bottom is also connected to the liquid return port of the first distillation tower through a third pipeline, and a flange is provided on the third pipeline.
[0011] As described above, the double-tower deacidification device, further, the liquid outlet of the second tower bottom is also connected to the liquid return port of the second distillation tower through a fourth pipeline and a fifth pipeline, and the liquid return port of the second distillation tower connected to the fifth pipeline is higher than the liquid return port connected to the fourth pipeline.
[0012] The double-tower deacidification device as described above, further, a condenser is provided on the pipelines connecting the first distillation tower and the second distillation tower with the second collecting tank.
[0013] In the double-tower deacidification device as described above, further, the condenser is also connected to a vacuum pump.
[0014] In the double-tower deacidification device as described above, further, the condenser is provided with a return water inlet and a water inlet.
[0015] The double-tower deacidification device as described above, further, the first tower bottom and the second tower bottom are both provided with a liquid level switch and a liquid level sensor.
[0016] The double-tower deacidification device as described above, further, the preheater is provided with a liquid level switch and a liquid level sensor.
[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model can continuously deacidify the ethylene chlorocarbonate mixed liquid through the double distillation tower, and at the same time, can also remove diethylene chlorocarbonate. Moreover, the continuous deacidification of the double distillation tower is higher than the intermittent deacidification of the single distillation tower, and the processing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 This is a schematic diagram of the overall structure of the device of an embodiment of the utility model;
[0020] In the figure: 1. first distillation tower; 2. second distillation tower; 3. first tower kettle; 4. second tower kettle; 5. first collecting tank; 6. second collecting tank; 7. preheater; 8. first pipeline; 9. second pipeline; 10. third pipeline; 11. fourth pipeline; 12. fifth pipeline; 13. condenser; 14. vacuum pump; 15. flange; 16. liquid level switch; 17. liquid level sensor; 18. water return port; 19. water inlet. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0022] Example:
[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" in the embodiments of the utility model and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0024] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0025] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0027] The utility model provides a technical solution: a double-tower deacidification device, which comprises a first distillation tower 1, a first tower bottom 3, a second distillation tower 2, a second tower bottom 4, a first collecting tank 5 and a second collecting tank 6; wherein, the first distillation tower 1 is provided with a liquid inlet, the liquid outlet of the first distillation tower 1 is communicated with the liquid inlet of the first tower bottom 3, the liquid outlet of the first tower bottom 3 is communicated with the liquid inlet of the second distillation tower 2 through a first pipeline 8 and a second pipeline 9 respectively, and the liquid inlet of the second distillation tower 2 connected to the second pipeline 9 is higher than the liquid inlet connected to the first pipeline 8, the liquid outlet of the second distillation tower 2 is communicated with the liquid inlet of the second tower bottom 4, the liquid outlet of the second tower bottom 4 is connected with the first collecting tank 5, and the gas outlet of the first distillation tower 1 and the gas outlet of the second distillation tower 2 are connected with the second collecting tank 6.
[0028] For details, see Figure 1When the device is in operation, the raw material ethylene chlorocarbonate mixed liquid enters the tower from the liquid inlet of the first distillation tower 1. The operating temperature range of the first distillation tower 1 is 90-110°C, and the operating pressure range is -90-50kPa. Under this environment, the ethylene chlorocarbonate mixed liquid is preliminarily deacidified, and then the gas flows from the upper gas outlet of the first distillation tower 1 to the first collecting tank 5, and the liquid flows from the lower liquid outlet of the first distillation tower 1 to the first tower bottom 3. The operating temperature in the first tower bottom 3 is 110°C. The other components in the ethylene chlorocarbonate mixed liquid after the preliminary deacidification are separated to form a ethylene chlorocarbonate semi-finished product. Then, according to the specific situation, the mixed liquid of the ethylene chlorocarbonate semi-finished product can be transported to the second distillation tower 2 through the first pipeline 8 or the second pipeline 9. The operating temperature range of the second distillation tower 2 is 80-100°C, and the operating pressure range is -100-98kPa. When conveyed by the first pipeline 8, it is to carry out the secondary deacidification mode, because the position of this connection port is relatively low, organic vapor in the tower has more condensation time, so at this moment, what flows into the gas phase pipeline from the upper gas outlet of the second distillation tower 2 is mainly mineral acid (mainly hydrogen chloride), the amount of organic light constituent is less, at this moment, the material in the second collection tank 6 is less, and the acidity of the product in the first collection tank 5 is lower, but ethylene dichloride is basically unchanged. This mode is applicable to the situation that rectification produces ethylene dichloride less. When conveyed by the second pipeline 9, it is to carry out the light mode of taking off, because the position of this connection port is relatively high, the light constituent in the liquid phase of the mixed solution of ethylene dichloride semi-finished product in the tower is because of decompression rapid evaporation, so at this moment, what flows into the gas phase pipeline from the upper gas outlet of the second distillation tower 2 is mainly mineral acid (mainly hydrogen chloride) and organic light constituent (mainly ethylene dichloride), at this moment, the material in the second collection tank 6 is more, and the acidity of the product in the first collection tank 5 is lower, and the content of ethylene dichloride is lower simultaneously. This mode is suitable for the case where distillation produces more ethylene dichloride carbonate. In addition, compared with the existing single distillation tower intermittent deacidification, the double distillation tower deacidification of this device can increase the processing efficiency from 1-1.5t / h to 2-2.5t / h, with higher processing efficiency. At the same time, this device can also remove ethylene dichloride carbonate, reducing the content of ethylene dichloride carbonate from 8% to 3-4%.
[0029] As an optional implementation, in some embodiments, a preheater 7 is provided on the second pipeline 9, and flanges 15 are provided on the first pipeline 8 and the second pipeline 9. The installation of the preheater 7 can preheat the mixed liquid of the ethylene chlorocarbonate semi-finished product to the required temperature, thereby improving the efficiency of the distillation. The installation of the flange 15 facilitates the installation and removal of the first pipeline 8 and the second pipeline 9, and at the same time, can improve the sealing performance of the connection and can withstand greater pressure and temperature.
[0030] As an optional embodiment, in some embodiments, the liquid outlet of the first tower bottom 3 is also connected to the liquid return port of the first distillation tower 1 through the third pipeline 10, and the third pipeline 10 is provided with a flange 15. Among them, the chloroethylene carbonate mixed liquid will flow back into the first distillation tower 1 from the third pipeline 10 after being pretreated in the first distillation tower 1 and the first tower bottom 3, and then continue to participate in distillation and separation, thereby further improving the purity of the product. The effect of installing the flange 15 is the same as that of the above embodiment, and will not be repeated here.
[0031] As an optional implementation, in some embodiments, the liquid outlet of the second tower bottom 4 is also connected to the liquid return port of the second distillation tower 2 through the fourth pipeline 11 and the fifth pipeline 12, and the liquid return port of the second distillation tower 2 connected to the fourth pipeline 11 is higher than the liquid return port connected to the fifth pipeline 12. Among them, after passing through the second distillation tower 2 and the second tower bottom 4, the mixed liquid of the ethylene chlorocarbonate semi-finished product can be refluxed into the second distillation tower 2 from the fourth pipeline 11 and the fifth pipeline 12, and then continue to participate in secondary deacidification or light removal, thereby further improving the purity of the product. At the same time, this can ensure the uniformity of the materials in the whole process.
[0032] As an optional implementation, in some embodiments, a condenser 13 is provided on the pipeline connecting the first distillation tower 1 and the second distillation tower 2 with the second collection tank 5. The installation of the condenser 13 can condense and liquefy the gas flowing out of the upper gas outlets of the first distillation tower 1 and the second distillation tower 2, which can reduce energy waste and save energy consumption on the one hand, and prevent the first collection tank 5 from being damaged due to collecting gas with too high a temperature on the other hand, thereby improving the service life of the first collection tank 5.
[0033] In the above embodiment, the condenser 13 is further connected to a vacuum pump 14. The vacuum pump 14 can evacuate the pipeline to prevent some impurities from affecting the product. At the same time, the condenser 13 can also remove steam from the gas, making the vacuum pump 13 more efficient in conveying the gas.
[0034] As an optional implementation, in some embodiments, the condenser 13 is provided with a return water port 18 and an upper water port 19. The upper water port 19 allows cooling water to be added from the outside to enter the condenser 13, while the return water port 18 allows the cooling water to flow back to the condenser 13 for recycling.
[0035] As an optional embodiment, in some embodiments, the first tower reactor 3 and the second tower reactor 4 are both provided with a liquid level switch 16 and a liquid level sensor 17. Among them, the liquid level switch is a device that triggers a switch action when the liquid level reaches a predetermined position. It usually only provides two states: open (ON) or closed (OFF), corresponding to the liquid level being higher or lower than a preset point. The liquid level switch is commonly used for alarm or start / stop control, and illustratively, an alarm is triggered when the liquid level reaches a high level or a low level. The liquid level sensor can continuously monitor the liquid level and provide continuous liquid level readings. These sensors usually output analog signals (such as 4-20mA current signals) or digital signals (such as through HART, Modbus or other communication protocols) to indicate the real-time value of the liquid level. In this way, after the first tower reactor 3 and the second tower reactor 4 are installed with a liquid level switch 16 and a liquid level sensor 17, more accurate control can be achieved and the convenience of the device can be improved. Preferably, the liquid level switch 16 may be an EE-SX613 1M liquid level switch produced by Omron; and the liquid level sensor 17 may be a capacitive liquid level sensor of model RKL-04.
[0036] As an optional implementation, in some embodiments, the preheater 7 is provided with a liquid level switch 16 and a liquid level sensor 17. Among them, the installation of the liquid level switch 16 and the liquid level sensor 17 on the preheater 7 can achieve more accurate control and improve the convenience of the device. Preferably, the liquid level switch 16 and the liquid level sensor 17 in the above implementation can be adopted.
[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0038] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.
Claims
1. A double-tower deacidification device, characterized in that: include: A first distillation tower, a first tower still, a second distillation tower, a second tower still, a first collecting tank and a second collecting tank; Wherein, the first distillation tower is provided with a liquid inlet, the liquid outlet of the first distillation tower is connected with the liquid inlet of the first tower bottom, the liquid outlet of the first tower bottom is connected with the liquid inlet of the second distillation tower through the first pipeline and the second pipeline respectively, and the liquid inlet of the second distillation tower connected with the second pipeline is higher than the liquid inlet connected with the first pipeline, the liquid outlet of the second distillation tower is connected with the liquid inlet of the second tower bottom, the liquid outlet of the second tower bottom is connected with the first collecting tank, and the gas outlet of the first distillation tower and the gas outlet of the second distillation tower are connected with the second collecting tank.
2. The double-tower deacidification device according to claim 1, characterized in that: A preheater is arranged on the second pipeline, and flanges are arranged on the first pipeline and the second pipeline.
3. The double-tower deacidification device according to claim 1, characterized in that: The liquid outlet of the first tower kettle is also connected to the liquid return port of the first distillation tower through a third pipeline, and a flange is provided on the third pipeline.
4. The double-tower deacidification device according to claim 1, characterized in that: The liquid outlet of the second tower kettle is also connected to the liquid return port of the second distillation tower through the fourth pipeline and the fifth pipeline, and the liquid return port of the second distillation tower connected to the fifth pipeline is higher than the liquid return port connected to the fourth pipeline.
5. The double-tower deacidification device according to claim 1, characterized in that: Condensers are provided on the pipelines connecting the first distillation tower and the second distillation tower with the second collecting tank.
6. The double-tower deacidification device according to claim 5, characterized in that: The condenser is also connected to a vacuum pump.
7. The double-tower deacidification device according to claim 5, characterized in that: The condenser is provided with a water return port and a water supply port.
8. The double-tower deacidification device according to claim 1, characterized in that: The first tower bottom and the second tower bottom are both provided with a liquid level switch and a liquid level sensor.
9. The double-tower deacidification device according to claim 2, characterized in that: The preheater is provided with a liquid level switch and a liquid level sensor.