Gas-liquid separation system of rectifying tower

Abstract

According to the gas-liquid separation system of the rectifying tower, through the combined design of the conical top plate, the supporting strips, the fixing strips and the liquid outlet pipe, liquid-phase products in the rectifying section can be effectively collected. Specifically, due to the design of the conical top plate, the liquid phase can be naturally collected to the inner ring of the base along the inclined surface, and the liquid phase is prevented from being dispersed or detained in the tower, so that the collection efficiency of the liquid phase is improved. The fence structure composed of the supporting strips and the fixing strips provides a smooth ascending channel for a gas phase, meanwhile, mutual interference of the gas phase and a liquid phase is avoided, and it is ensured that the gas-liquid separation process is efficiently carried out. The liquid outlet formed in the inner ring of the base is communicated with the liquid outlet pipe, so that the collected liquid phase can be quickly guided out, the retention time of the liquid phase in the tower is shortened, and the purity fluctuation caused by long-time retention is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of distillation and purification technology, specifically relating to a distillation column gas-liquid separation system. Background Technology

[0002] In the field of chemical separation, distillation is a commonly used separation technique, especially suitable for the separation and purification of liquid mixtures. However, when the boiling points of the components in a mixture are similar, traditional distillation separation processes often face significant challenges. Because components with similar boiling points exhibit relatively small differences in distribution between the gas and liquid phases, separation efficiency is low, easily leading to fluctuations in the purity of the final product and affecting product quality. Therefore, how to effectively separate mixtures with similar boiling points has always been a pressing technical problem to be solved in the field of distillation.

[0003] Taking hexamethyldisiloxane (MM) as an example, it is an important primary organosilicon raw material, widely used in the preparation of chemical products such as silicone oil end-capping agents, silazane raw materials, silicone rubber additives, pharmaceutical defoamers, gas chromatography stationary phases, precision instrument cleaning agents, lubricants, hydrophobic agents, and desiccants. The Si-O-Si bonds in the hexamethyldisiloxane molecular chain structure have high chemical bond energy, thus polysiloxanes prepared using it as an end-capping agent exhibit excellent thermal and chemical stability. Hexamethyldisiloxane is typically produced by hydrolyzing trimethylchlorosilane with concentrated hydrochloric acid to generate a mixture of hexamethyldisiloxane, hydrogen chloride, and water, followed by distillation to obtain high-purity hexamethyldisiloxane. During the distillation of hexamethyldisiloxane, the boiling points of the components in the resulting mixture are relatively close, limiting the separation efficiency of traditional distillation equipment and easily leading to fluctuations in the purity of the final product. Especially in the liquid dispensing stage, traditional equipment typically uses direct discharge, lacking further optimized collection of the liquid phase product, further exacerbating the problem of purity instability.

[0004] Therefore, in existing distillation columns, after the gas and liquid phases are separated by heating with the auxiliary equipment reboiler, the raw materials slowly accumulate to the liquid outlet after repeated long-distance exchanges, which can easily cause fluctuations in the purity of the separated products. Utility Model Content

[0005] This invention provides a gas-liquid separation system for a distillation column, which solves the problem in the prior art where raw materials in a distillation column slowly accumulate to the liquid outlet after repeated long-distance exchanges, easily causing fluctuations in the purity of the separated product.

[0006] This utility model provides a gas-liquid separation system for a distillation column, including a distillation column. A gas-liquid separation device is installed in the rectification section above the feed inlet of the distillation column. The gas-liquid separation device includes a conical top plate, two or more support bars, two or more fixing bars, and a liquid outlet pipe. The base is a circular ring structure. The outer ring of the base is fixedly connected to the column wall of the distillation column. The inner ring of the base has two or more vertically upward fixing bars spaced apart. The end of each fixing bar away from the base is fixedly connected to one end of a support bar. The fixing bars and support bars form a grid structure for the passage of gas phase. The end of each support bar away from the fixing bars is fixedly connected to the outer edge of the conical top plate. A liquid outlet is opened on the outer side of the inner ring of the base, and the liquid outlet communicates with the liquid outlet pipe, which is used to output and collect the liquid phase.

[0007] Compared with existing technologies, the advantages of this invention are as follows: Through the combined design of a conical top plate, support bars, fixing bars, and a liquid outlet pipe, the liquid phase product in the rectification section can be effectively collected. Specifically, the conical top plate design allows the liquid phase to naturally converge along its inclined surface to the inner ring of the base, preventing the liquid phase from dispersing or stagnating within the column, thereby improving the collection efficiency. The grid structure composed of support bars and fixing bars provides a smooth upward channel for the gas phase, while avoiding mutual interference between the gas and liquid phases, ensuring the efficient operation of the gas-liquid separation process. The liquid outlet in the inner ring of the base connects to the liquid outlet pipe, enabling the rapid export of the collected liquid phase, reducing the residence time of the liquid phase within the column, and avoiding purity fluctuations caused by prolonged residence. The distillation column gas-liquid separation system provided by this invention not only optimizes the collection and export process of the liquid phase but also significantly improves the gas-liquid separation efficiency, making it particularly suitable for separating mixtures with similar boiling points, ensuring the high purity and stability of the final liquid phase product.

[0008] Furthermore, the gas-liquid separation device also includes an outer ring baffle, which is vertically arranged on the inner side of the outer ring of the base. The base has a liquid outlet in the gap between the outer ring baffle and the tower wall, which is used to allow the liquid phase on the tower wall to pass through.

[0009] Furthermore, the upper end of the outer ring baffle is also connected to a horizontally arranged liquid-separating baffle facing inward, which is used to collect the liquid phase in the gas phase passing through the grid structure.

[0010] Furthermore, a gas-liquid separation device is also installed in the stripping section below the feed inlet of the distillation column.

[0011] Furthermore, the rectifying section is packed with Pall ring packing, and the stripping section is packed with corrugated plate packing.

[0012] Furthermore, the column height of the rectification section is 8-13m, and the column height of the stripping section is 12-17m.

[0013] Furthermore, a demister is also installed at the top of the distillation column to collect the liquid phase in the gas phase.

[0014] Furthermore, the upper part of the distillation column is also equipped with a condensation reflux port, which is used to recover the liquid phase in the gas phase.

[0015] Furthermore, the bottom of the distillation column is also equipped with a reboiler reflux port, which is used to remove the gas phase from the liquid phase.

[0016] Furthermore, the inner wall of the distillation column is lined with polytetrafluoroethylene. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a distillation column gas-liquid separation system provided in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a gas-liquid separation device provided in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of a gas-liquid separation device provided in another embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Distillation gas-liquid separation device; 2. Stripping gas-liquid separation device; 3. Demister; 4. Rectifying section; 5. Feed inlet; 6. Condensate reflux inlet; 8. Reboiler reflux inlet; 9. Stripping section; 11. Conical top plate; 12. Outer ring baffle; 13. Support bar; 14. Fixing bar; 15. Liquid outlet pipe; 16. Base; 17. Liquid slugging baffle; 18. Liquid outlet. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Please see Figure 1 and Figure 2This utility model provides a gas-liquid separation system for a distillation column, including a distillation column. A gas-liquid separation device is provided in the rectification section 4 above the feed inlet 5 of the distillation column. The gas-liquid separation device includes a conical top plate 11, an outer ring baffle 12, two or more support bars 13, two or more fixing bars 14, and a liquid outlet pipe 15. The base 16 is a ring structure. The outer ring of the base 16 is fixedly connected to the column wall of the distillation column. The inner ring of the base 16 is provided with two or more vertically upward fixing bars 14 at intervals. The end of the fixing bar 14 away from the base 16 is fixedly connected to the end of the support bar 13. The fixing bar 14 and the support bar 13 form a fence structure for the passage of gas phase. The end of the support bar 13 away from the fixing bar 14 is fixedly connected to the outer edge of the conical top plate 11. A liquid outlet is opened on the outer side of the inner ring of the base 16. The liquid outlet is connected to the liquid outlet pipe 15, which is used to output the collected liquid phase.

[0024] The distillation column gas-liquid separation system provided by this utility model, through the combined design of a conical top plate 11, support bars 13, fixing bars 14, and a liquid outlet pipe 15, can effectively collect the liquid phase product in the rectification section 4. Specifically, the design of the conical top plate 11 allows the liquid phase to naturally collect along its inclined surface to the inner ring of the base 16, avoiding dispersion or retention of the liquid phase in the column, thereby improving the collection efficiency of the liquid phase. The grid structure composed of support bars 13 and fixing bars 14 provides a smooth upward channel for the gas phase, while avoiding mutual interference between the gas and liquid phases, ensuring the efficient operation of the gas-liquid separation process. The liquid outlet in the inner ring of the base 16 is connected to the liquid outlet pipe 15, which can quickly export the collected liquid phase, reduce the residence time of the liquid phase in the column, and avoid purity fluctuations caused by prolonged retention. The distillation column gas-liquid separation system provided by this utility model not only optimizes the collection and export process of the liquid phase, but also significantly improves the gas-liquid separation efficiency, and is particularly suitable for the separation of mixtures with similar boiling points, ensuring the high purity and stability of the final liquid phase product.

[0025] Please see Figure 3 Furthermore, the gas-liquid separation device also includes an outer ring baffle 12, which is vertically arranged on the inner side of the outer ring of the base 16. The base 16 has a liquid outlet 18 in the gap between the outer ring baffle 12 and the tower wall, which is used to allow the liquid phase on the tower wall to pass through.

[0026] By setting a vertical outer ring baffle 12 on the inner side of the outer ring of the base 16 and opening a liquid outlet 18 between the base 16 and the outer ring baffle 12, the liquid phase on the column wall of the distillation column can flow down the column wall and be further separated in the stripping section 9, thereby further improving the collection efficiency of the liquid phase, reducing product loss, and improving product purity.

[0027] Furthermore, the upper end of the outer ring baffle 12 is also connected to a horizontally arranged liquid-separating baffle 17 facing inward, which is used to collect the liquid phase in the gas phase passing through the grid structure.

[0028] The horizontal liquid-separating baffle 17 connected to the upper end of the outer ring baffle 12 can further collect the liquid phase entrained in the gas phase passing through the fence structure, prevent the liquid phase from being carried away by the gas phase, thereby reducing liquid phase loss and improving the product recovery rate and purity.

[0029] Optionally, a gas-liquid separation device is also provided in the stripping section 9 below the feed inlet 5 of the distillation column.

[0030] A gas-liquid separation device is also installed in the stripping section 9, which can effectively collect the heavy component liquid phase in the stripping section 9, avoid excessive accumulation of heavy component liquid phase at the bottom of the column, which would affect the separation effect, and at the same time improve the purity and recovery rate of heavy component products.

[0031] The liquid outlet pipe 15 of the gas-liquid separation device in the stripping section 9 can be selected to either lead to the outside of the tower or remain inside the tower for further stripping, depending on the product purity, so as to further improve the product purity.

[0032] Furthermore, the rectifying section 4 is packed with Pall ring packing, and the stripping section 9 is packed with corrugated plate packing.

[0033] By using the aforementioned packing combinations, the gas-liquid mass transfer requirements of different sections can be further met, gas-liquid contact efficiency can be improved, separation effect can be enhanced, and energy consumption can be reduced.

[0034] Specifically, the column height of rectification section 4 is 8~13m, and the column height of stripping section 9 is 12~17m.

[0035] By rationally setting the column height range of rectification section 4 and stripping section 9, the gas-liquid mass transfer process can be optimized to ensure efficient separation of light and heavy components, while avoiding increased energy consumption due to excessive column height or decreased separation efficiency due to excessive column height.

[0036] In one specific embodiment, the top of the distillation column is also provided with a demister 3, which is used to collect the liquid phase in the gas phase; the upper part of the distillation column is also provided with a condensation reflux port 6, which is used to recover the liquid phase in the gas phase; the bottom of the distillation column is also provided with a reboiler reflux port 8, which is used to remove the gas phase in the liquid phase; the inner wall of the distillation column is provided with a polytetrafluoroethylene lining.

[0037] A specific embodiment of this utility model

[0038] A mixture comprising hexamethyldisiloxane, hydrogen chloride, and water is passed through (e.g.) Figure 1 The feed inlet 5 (as shown) is fed into the gas-liquid separation system of the distillation column for separation.

[0039] The distillation column gas-liquid separation system includes a distillation column, and a distillation gas-liquid separation device 1 (e.g., ...) is installed in the rectification section 4 above the distillation column. Figure 2As shown, the distillation gas-liquid separation device 1 includes a conical top plate 11, an outer ring baffle 12, four support bars 13, four fixing bars 14, and a liquid outlet pipe 15.

[0040] The base 16 is a circular ring structure. The outer ring of the base 16 is fixedly connected to the wall of the distillation column. The inner ring of the base 16 is provided with four vertically upward fixing strips 14. The end of the fixing strip 14 away from the base 16 is fixedly connected to the end of the support strip 13. The fixing strip 14 and the support strip 13 form a grid structure for the passage of gas phase. The end of the support strip 13 away from the fixing strip 14 is fixedly connected to the outer edge of the conical top plate 11. The outer ring baffle 12 is vertically arranged inside the outer ring of the base 16. The base 16 has a liquid outlet 18 in the gap between the outer ring baffle 12 and the column wall. The liquid outlet 18 is used to allow the liquid phase on the column wall to pass through. The upper end of the outer ring baffle 12 is also connected to a horizontally arranged liquid-blocking baffle 17 facing inward. The liquid-blocking baffle 17 is used to collect the liquid phase in the gas phase passing through the grid structure.

[0041] A liquid outlet is provided on the outer side of the inner ring of the base 16. The liquid outlet is connected to the liquid outlet pipe 15, which leads to the outside of the tower to output hexamethyldisiloxane product.

[0042] The stripping section 9 below the feed inlet 5 of the distillation column is equipped with a stripping gas-liquid separator 2 (e.g., Figure 3 As shown, it includes a conical top plate 11, four support bars 13, four fixing bars 14, and a liquid outlet pipe 15.

[0043] The base 16 is a ring structure. The outer ring of the base 16 is fixedly connected to the wall of the distillation column. The inner ring of the base 16 is provided with four vertically upward fixing strips 14. The end of the fixing strip 14 away from the base 16 is fixedly connected to one end of the support strip 13. The fixing strip 14 and the support strip 13 form a fence structure for the passage of gas phase. The end of the support strip 13 away from the fixing strip 14 is fixedly connected to the outer edge of the conical top plate 11.

[0044] A liquid outlet is provided on the outer side of the inner ring of the base 16. The liquid outlet is connected to the liquid outlet pipe 15. The outlet of the liquid outlet pipe 15 is placed inside the column to collect the liquid phase for further distillation.

[0045] After separating the mixture of hexamethyldisiloxane, hydrogen chloride, and water using the distillation column gas-liquid separation system in the above embodiment, the hexamethyldisiloxane product output from the outlet pipe 15 of the distillation gas-liquid separation device 1 has a purity of 99.95%.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, they should be considered to be within the protection scope of this utility model.

Claims

1. A vapor-liquid separation system for a distillation column, comprising: The gas-liquid separation device comprises a conical top plate, two or more supporting strips, two or more fixing strips, and a liquid outlet pipe. The outer ring of the base is fixedly connected with the tower wall of the rectifying tower, and the inner ring of the base is provided with two or more vertically upward fixing strips at intervals. The inner side of the outer ring of the base is provided with a liquid outlet, and the liquid outlet is communicated with the liquid outlet pipe.

2. The rectifier vapor-liquid separation system of claim 1, wherein, The gas-liquid separation device further comprises an outer ring baffle which is vertically arranged on the inner side of the outer ring of the base.

3. The rectifier vapor-liquid separation system of claim 2, wherein, The base is provided with a liquid flow port at the gap between the outer ring baffle and the tower wall.

4. The vapor-liquid separation system of any one of claims 1-3, wherein, The upper end of the outer ring baffle is further connected with a liquid separation baffle which is horizontally arranged towards the inner side.

5. The rectifier vapor-liquid separation system of claim 4, wherein, The liquid separation baffle is used to collect the liquid phase in the gas phase passing through the grid structure.

6. The rectifier vapor-liquid separation system of claim 5, wherein, The rectifying section of the rectifying tower is filled with Pall ring packing, and the stripping section is filled with wave plate packing.

7. The vapor-liquid separation system of any one of claims 1-3, wherein, The tower height of the rectifying section is 8-13 m, and the tower height of the stripping section is 12-17 m.

8. The vapor-liquid separation system of any one of claims 1-3, wherein, The top of the rectifying tower is further provided with a demister which is used to collect the liquid phase in the gas phase.

9. The vapor-liquid separation system of any one of claims 1-3, wherein, The upper part of the rectifying tower is further provided with a condensation reflux port which is used to recover the liquid phase in the gas phase.

10. The vapor-liquid separation system of any one of claims 1-3, wherein, The bottom of the rectifying tower is further provided with a reboiling reflux port which is used to remove the gas phase in the liquid phase. The inner wall of the rectifying tower is provided with a polytetrafluoroethylene lining.

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