Rectifying tower top azeotrope dehydration device

Abstract

The utility model relates to a rectifying tower top azeotrope dehydration device which comprises two dehydration units which are connected in series, each dehydration unit comprises a vertical tank and a steam permeable membrane tube bundle, and the technical key points are as follows: an upper partition plate and a lower partition plate are arranged in the upper part of the vertical tank, and a steam gathering space is formed between the top of the vertical tank and the upper partition plate; a secondary separation area is formed between the lower partition plate and the bottom of the vertical tank, a feeding port is formed in the position, corresponding to the water vapor gathering space, of the side wall of the vertical tank, a water vapor outlet is formed in the top face of the vertical tank, a vapor permeable membrane tube bundle is clamped between the upper partition plate and the lower partition plate, and the upper end of each vapor permeable membrane tube is communicated with the water vapor gathering space. A heating jacket is arranged at the bottom of the secondary separation area, an ethanol recovery opening is formed in the position, corresponding to the secondary separation area, of the side wall of the vertical tank, and a baffle assembly corresponding to the ethanol recovery opening is arranged in the secondary separation area. The device not only improves the permeation separation efficiency, but also facilitates product collection.

Description

Technical Field

[0001] The utility model relates to the technical field of sulbactam sodium production equipment, in particular to an azeotropic dehydration device at the top of a distillation tower. Background Art

[0002] Sulbactam sodium is an artificially synthesized irreversible competitive β-lactamase inhibitor, usually used in combination with penicillins and cephalosporins to prevent them from being destroyed by β-lactamase, enhance their antibacterial activity, and are suitable for respiratory system infections. At present, a large amount of ethanol mother liquor is produced in the common production process of sulbactam sodium, and recycling ethanol for recycling is a common practice in the industry.

[0003] When recovering ethanol, the pH of the sulbactam sodium mother liquor can be adjusted to 5-7 with alkali, and sodium acetate can be selectively added to the sulbactam sodium mother liquor to control the sodium acetate content to be not less than 4%; the obtained mixed solution is then sent to a distillation tower for distillation, and an azeotrope containing water and ethanol is obtained from the top of the distillation tower, and a part of the azeotrope containing water and ethanol is refluxed, and the other part enters a dehydration device for dehydration, and ethanol is obtained on the interception side of the dehydration device. Among them, the dehydration device generally uses a steam permeation membrane component.

[0004] CN 202860416 U discloses a shell-and-tube type steam permeation membrane assembly, which includes a shell, at least one membrane tube is arranged in the shell along the axial direction of the shell, the axial ends of the shell are respectively connected to an upper tube sheet and a lower tube sheet, the upper tube sheet and the lower tube sheet are respectively provided with holes corresponding to the number and position of the membrane tubes, and the two ends of the membrane tube are respectively sealed and connected to the holes on the upper tube sheet and the lower tube sheet; the shell is provided with a gas inlet to be separated and a retentate gas outlet, one axial end of the shell is connected with a head through a flange, the membrane tube passes through the tube sheet at this end and passes into the head, the head is provided with a permeate gas outlet, and the other axial end of the shell is sealed and connected with an end cap. The packing density of the membrane tube per unit volume of the patent is large, which is conducive to improving the permeation separation efficiency. However, there are the following problems when using it: the azeotropic substance discharged from the distillation tower usually needs to be further heated by a heater, and then enters the steam permeation membrane assembly for separation; at the same time, although the partition in the steam permeation membrane assembly extends the separation path, which is conducive to improving the permeation separation efficiency, the gas is easily condensed into droplets after encountering the partition, which is not conducive to the collection of subsequent products. Utility Model Content

[0005] The purpose of the utility model is to provide a distillation tower top azeotrope dehydration device which has a reasonable structure and reliable use to solve the above problems, thereby improving the permeation separation efficiency and facilitating product collection.

[0006] The technical solution of the utility model is:

[0007] A device for dehydrating azeotropic mixture at the top of a distillation tower comprises two dehydration units connected in series, the dehydration unit comprises a vertical tank and a steam permeable membrane tube bundle arranged in the vertical tank, and the technical key points are: an upper baffle and a lower baffle are built in the upper part of the vertical tank, a water vapor gathering space is formed between the top of the vertical tank and the upper baffle, a secondary separation zone is formed between the lower baffle and the bottom of the vertical tank, a feed port is arranged at a position of the side wall of the vertical tank corresponding to the water vapor gathering space, a water vapor outlet is arranged at the top surface of the vertical tank, the steam permeable membrane tube bundle is clamped between the upper and lower baffles, the upper end of each steam permeable membrane tube of the steam permeable membrane tube bundle is communicated with the water vapor gathering space, and the lower end is covered with a permeable membrane after passing through the lower baffle, a plurality of through holes are arranged on the outer peripheral wall of the steam permeable membrane tube and the outer side of the through holes is covered with a permeable membrane, a plurality of air permeable holes are arranged on the lower baffle, a heating jacket is arranged at the bottom of the secondary separation zone, an ethanol recovery port is arranged at a position of the side wall of the vertical tank corresponding to the secondary separation zone, and a baffle assembly corresponding to the ethanol recovery port is arranged inside the secondary separation zone.

[0008] The above-mentioned azeotropic dehydration device at the top of the distillation tower, the baffle assembly includes a right-angle baffle and a vertical plate, the end of the horizontal section of the right-angle baffle is connected and fixed to the position above the ethanol recovery port of the vertical tank, the edge of the vertical section of the right-angle baffle is connected and fixed to the front and rear side walls of the vertical tank, an air hole is provided in the middle of the vertical section, the lower end of the vertical plate is connected and fixed to the bottom surface of the vertical tank, the upper end of the vertical plate extends toward the horizontal section of the right-angle baffle and retains a set spacing, an air hole is provided in the middle of the vertical plate, and the right-angle baffle and the vertical plate form a serpentine channel corresponding to the ethanol recovery port.

[0009] In the above-mentioned azeotropic dehydration device at the top of the distillation tower, the ethanol recovery port of the vertical tank of the first dehydration unit is connected to the feed port of the vertical tank of the second dehydration unit, the water vapor outlets of the vertical tanks of the two dehydration units are respectively connected to the converging pipeline, and the bottom center of the vertical tanks of the two dehydration units is provided with a drainage port, and the two drainage ports are connected by a converging pipeline.

[0010] In the above-mentioned azeotropic dehydration device at the top of the distillation tower, the steam permeable membrane tube bundle is composed of a plurality of evenly arranged steam permeable membrane tubes, and the center line of the steam permeable membrane tube is parallel to the center line of the vertical tank.

[0011] The beneficial effects of the utility model are:

[0012] 1. The steam permeable membrane tube bundle is clamped between the upper and lower baffles, and the first separation and dehydration zone is formed in the area formed by the upper and lower baffles. After the mixed material enters the bundle, most of the water vapor in it enters the bundle through the permeable membrane on the outside of the steam permeable membrane tube bundle, and then is transmitted to the water vapor gathering space by the bundle. Finally, under the action of negative pressure, it is discharged from the water vapor gathering space and the water vapor outlet of the vertical tank, while the other part of the ethanol mixed with a small amount of water vapor enters the secondary separation zone through the air holes on the lower baffle. Under the action of the heating jacket, the temperature of the mixed material is maintained. After entering the secondary separation zone, the residual water vapor in it enters the steam permeable membrane tube again through the permeable membrane at the lower end of the steam permeable membrane tube, and then enters the water vapor focusing space from the steam permeable membrane tube, thereby being discharged from the vertical tank, while the ethanol gas passes through the baffle assembly and is discharged from the ethanol outlet, thereby realizing the separation and dehydration process. During the whole process, the temperature of the material to be separated is maintained, and there is no need to set up another heater outside the device, so that the gaseous state of the material is maintained. After two separations, the permeation separation efficiency is improved, which is conducive to product collection.

[0013] 2. The two dehydration units are connected in series to further improve the osmotic separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] In the figure: 1. feed inlet, 2. vertical tank, 3. water vapor outlet, 4. steam permeable membrane tube bundle, 5. upper partition, 6. ethanol recovery port, 7. lower partition, 8. air vent, 9. right-angle baffle, 10. heating jacket, 11. vertical plate, 12. drain port, 13. air hole, 14. air hole. DETAILED DESCRIPTION

[0016] The utility model is described in detail according to the accompanying drawings of the specification.

[0017] like Figure 1 As shown, the azeotropic dehydration device at the top of the distillation tower includes two dehydration units connected in series. The dehydration unit includes a vertical tank 2 and a steam permeable membrane tube bundle 4 arranged in the vertical tank 2.

[0018] Among them, an upper partition 5 and a lower partition 7 are built into the upper part of the vertical tank 2, a water vapor gathering space is formed between the top of the vertical tank 2 and the upper partition 5, a primary separation zone is formed between the upper and lower partitions 5 and 7, and a secondary separation zone is formed between the lower partition 7 and the bottom of the vertical tank 2. A feed port 1 is provided at the position of the water vapor gathering space corresponding to the side wall of the vertical tank 2, and a water vapor outlet 3 is provided on the top surface of the vertical tank 2. The steam permeable membrane tube bundle 4 is clamped between the upper and lower partitions 5 and 7. The upper end of each steam permeable membrane tube of the steam permeable membrane tube bundle 2 is connected to the water vapor gathering space, and the lower end is covered with a permeable membrane after passing through the lower partition 7. A plurality of through holes are provided on the outer peripheral wall of the steam permeable membrane tube and the outer side of the through hole is covered with a permeable membrane. A plurality of air holes 8 are provided on the lower partition 7. The steam permeable membrane tube bundle 4 is composed of a plurality of uniformly arranged steam permeable membrane tubes, and the center line of the steam permeable membrane tube is parallel to the center line of the vertical tank 2.

[0019] A heating jacket 10 is provided at the bottom of the secondary separation zone, an ethanol recovery port 6 is provided at a position on the side wall of the vertical tank 2 corresponding to the secondary separation zone, and a baffle assembly corresponding to the ethanol recovery port 6 is provided inside the secondary separation zone. In this embodiment, the baffle assembly includes a right-angle baffle 9 and a vertical plate 11. The end of the horizontal section of the right-angle baffle 9 is connected and fixed to the position above the ethanol recovery port 6 of the vertical tank 2, the edge of the vertical section of the right-angle baffle 9 is connected and fixed to the front and rear side walls of the vertical tank 2, and an air hole 13 is provided in the middle of the vertical section. The lower end of the vertical plate 11 is connected and fixed to the bottom surface of the vertical tank 2, and the upper end of the vertical plate 11 extends to the horizontal section of the right-angle baffle 9 and retains a set spacing. An air hole 14 is provided in the middle of the vertical plate 11. The right-angle baffle 9 and the vertical plate 11 form a serpentine channel corresponding to the ethanol recovery port 6 to extend the separation path.

[0020] When in use, the ethanol recovery port 6 of the vertical tank 2 of the first dehydration unit is connected to the feed port 1 of the vertical tank 2 of the second dehydration unit, and the water vapor outlets 3 of the vertical tanks 2 of the two dehydration units are respectively connected to the converging pipeline, and the end of the converging pipeline is connected to a cooler, and the cooler is connected to a vacuum pumping device. The drainage port 12 is set at the bottom center of the vertical tanks 2 of the two dehydration units, and the two drainage ports 12 are connected by the converging pipeline. The ethanol recovery port 6 of the second dehydration unit is connected to another cooler by a pipeline to collect the ethanol product.

[0021] Working principle:

[0022] During operation, the temperature in the vertical tank 2 is maintained at 110° C. by using the heating jacket 10, and the vacuum equipment is started to form a negative pressure in the vertical tank 2, so that the mixed material can continuously enter the device.

[0023] The steam permeable membrane tube bundle 4 in the two vertical tanks 2 performs a dehydration operation under negative pressure. Specifically, after the mixed material enters the vertical tank 2, most of the water vapor enters the tube through the permeable membrane outside the steam permeable membrane tube bundle 4, and then is transmitted to the water vapor gathering space by the tube bundle, and finally, under the action of negative pressure, it is discharged from the vertical tank 2 through the water vapor gathering space and the water vapor outlet 3, while the other part of the ethanol mixed with a small amount of water vapor enters the secondary separation area through the air holes 8 on the lower partition 7. Under the action of the heating jacket 10, the temperature of the mixed material is maintained. After entering the secondary separation area, the residual water vapor therein enters the steam permeable membrane tube again through the permeable membrane at the lower end of the steam permeable membrane tube, and then enters the water vapor focusing space from the steam permeable membrane tube, thereby being discharged from the vertical tank 2, and the ethanol gas is discharged from the ethanol outlet 6 after passing through the baffle assembly, thereby realizing the separation and dehydration process; the dehydration principles of the two vertical tanks 2 are the same.

[0024] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A device for dehydrating azeotropic mixture from the top of a distillation tower, comprising two dehydration units connected in series, wherein the dehydration units comprise a vertical tank and a steam permeable membrane tube bundle arranged in the vertical tank, characterized in that: An upper partition and a lower partition are built into the upper part of the vertical tank, a water vapor gathering space is formed between the top of the vertical tank and the upper partition, a secondary separation zone is formed between the lower partition and the bottom of the vertical tank, a feed port is provided at a position of the side wall of the vertical tank corresponding to the water vapor gathering space, a water vapor outlet is provided on the top surface of the vertical tank, the steam permeable membrane tube bundle is clamped between the upper and lower partitions, the upper ends of each steam permeable membrane tube of the steam permeable membrane tube bundle are communicated with the water vapor gathering space, and the lower ends are covered with a permeable membrane after passing through the lower partition, a plurality of through holes are provided on the outer peripheral wall of the steam permeable membrane tube and the outer sides of the through holes are covered with a permeable membrane, a plurality of air holes are provided on the lower partition, a heating jacket is provided at the bottom of the secondary separation zone, an ethanol recovery port is provided at a position of the side wall of the vertical tank corresponding to the secondary separation zone, and a baffle assembly corresponding to the ethanol recovery port is provided inside the secondary separation zone.

2. The azeotropic dehydration device for the distillation tower top according to claim 1, characterized in that: The baffle assembly includes a right-angle baffle and a vertical plate. The end of the horizontal section of the right-angle baffle is connected and fixed to the position above the ethanol recovery port of the vertical tank. The edge of the vertical section of the right-angle baffle is connected and fixed to the front and rear side walls of the vertical tank. An air hole is provided in the middle of the vertical section. The lower end of the vertical plate is connected and fixed to the bottom surface of the vertical tank. The upper end of the vertical plate extends toward the horizontal section of the right-angle baffle and retains a set spacing. An air hole is provided in the middle of the vertical plate. The right-angle baffle and the vertical plate form a serpentine channel corresponding to the ethanol recovery port.

3. The azeotropic dehydration device at the top of the distillation tower according to claim 1, characterized in that: The ethanol recovery port of the vertical tank of the first dehydration unit is connected to the feed port of the vertical tank of the second dehydration unit, the water vapor outlets of the vertical tanks of the two dehydration units are respectively connected to the confluence pipeline, and the bottom center of the vertical tanks of the two dehydration units is provided with a drainage port, and the two drainage ports are connected by a confluence pipeline.

4. The azeotropic dehydration device at the top of a distillation tower according to claim 1, characterized in that: The steam permeable membrane tube bundle is composed of a plurality of evenly arranged steam permeable membrane tubes, and the center line of the steam permeable membrane tube is parallel to the center line of the vertical tank.

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