Rectifying tower for ethanol recovery in cyanogen diester production

Abstract

The utility model relates to a rectifying tower for recovering ethanol in cyanodiester production, which comprises a tower body, a liquid inlet pipe assembly and a filler, according to the technical key points, the liquid inlet pipe assembly comprises an annular outer pipe arranged on the outer side of the tower body, a feeding pipe connected with the annular outer pipe, an annular inner ring arranged on the inner side wall of the tower body, a plurality of inclined flow dividing pipes uniformly connected to the lower part of the annular outer pipe, and a plurality of longitudinal guide pipes uniformly connected to the lower surface of the annular inner ring; the lower end of each inclined flow dividing pipe is inserted into the annular inner ring, the longitudinal guide pipe is welded and fixed with the inner wall of the tower body, an upper pore plate is supported above the annular inner ring, a lower pore plate is arranged at the lower part of the tower body, the filler comprises a lower filler part arranged between the lower pore plate and the annular inner ring, an upper filler part arranged above the upper pore plate, and a positioning pore plate is arranged above the upper filler part. The utility model solves the problem of concentrated liquid inlet of the existing rectifying tower, and improves the rectifying separation efficiency so as to achieve the purpose of quickly recovering ethanol.

Description

Technical Field

[0001] The utility model relates to the technical field of cyanodiester production, in particular to a rectification tower for recovering ethanol in cyanodiester production. Background Art

[0002] Cyanodiester is an important intermediate in the synthesis route of pregabalin. Waste liquid is produced during the preparation of cyanodiester. The waste liquid contains ethanol. In order to save the use of ethanol, it is usually recycled.

[0003] CN 209254165 U discloses an ethanol recovery device in a cyanodiester process, which includes a still, which is connected to a distillation tower through a pipeline, a wastewater pipe is connected to one side of the still, the top of the distillation tower is connected to a condenser through a gas pipeline, the right side of the condenser is connected to a balance tank through a pipeline, the bottom of the balance tank is connected to a cooler through a pipeline, and the bottom of the cooler is connected to an ethanol receiving tank through a pipeline. The device recovers ethanol by arranging a still and a distillation tower, thereby solving the problem of recycling ethanol in waste liquid and avoiding waste of resources. A distillation tower is used to separate ethanol from waste liquid, but the existing distillation tower has concentrated liquid inlet, which is not conducive to rapid distillation and separation. Utility Model Content

[0004] The utility model aims to provide a distillation tower for ethanol recovery in cyanodiester production with reasonable structure and reliable use, solves the problem of concentrated liquid inlet in the existing distillation tower, improves the distillation separation efficiency, and achieves the purpose of rapid ethanol recovery.

[0005] The technical solution of the utility model is:

[0006] A distillation tower for ethanol recovery in cyanodiester production comprises a tower body, a liquid inlet pipe assembly and a filler. The technical key points are as follows: the liquid inlet pipe assembly comprises an annular outer tube arranged outside the tower body, a feed pipe connected to the annular outer tube, an annular inner ring arranged on the inner side wall of the tower body, a plurality of inclined shunt pipes uniformly connected to the lower part of the annular outer tube, and a plurality of longitudinal guide pipes uniformly connected to the lower surface of the annular inner ring, the lower end of each inclined shunt pipe is inserted into the annular inner ring, the longitudinal guide pipe is welded and fixed to the inner wall of the tower body, an upper orifice plate is supported above the annular inner ring, a lower orifice plate is arranged at the lower part of the tower body, the filler comprises a lower filler part arranged between the lower orifice plate and the annular inner ring, an upper filler part arranged above the upper orifice plate, a positioning orifice plate is arranged above the upper filler part, an ethanol vapor outlet is arranged at the top of the tower body, the ethanol vapor outlet is connected to a liquid trap by a pipeline, the outlet of the liquid trap is connected to an ethanol recovery pipeline, a reflux pipeline is arranged at the bottom of the liquid trap, and the end of the reflux pipeline is inserted into the inner ring cavity of the annular inner ring.

[0007] The distillation tower for ethanol recovery in the production of cyanodiester is provided with a heating interlayer on the outside of the tower body, a steam inlet is provided at the bottom of the heating interlayer, and a steam outlet is provided on the upper side of the heating interlayer.

[0008] In the above-mentioned distillation tower for ethanol recovery in cyanodiester production, a gas phase rising space is formed between the positioning orifice plate and the top surface of the tower body, and a plurality of fins are arranged on the top surface of the tower body.

[0009] In the above-mentioned distillation tower for ethanol recovery in cyanodiester production, the upper packing part and the lower packing part are respectively formed by stacking multiple layers of corrugated plates, a plurality of distance rods are arranged between two adjacent corrugated plates, and the corrugated plates are provided with air permeable hole groups.

[0010] In the above-mentioned distillation tower for ethanol recovery in cyanodiester production, the lower end of the longitudinal guide tube extends to below the lower perforated plate.

[0011] In the above-mentioned distillation tower for ethanol recovery in the production of cyanodiester, the feed pipe is provided with a spare pipe opening.

[0012] The distillation tower for ethanol recovery in the above-mentioned cyanodiester production has a waste liquid discharge outlet at the bottom of the tower body.

[0013] The beneficial effects of the utility model are:

[0014] The material is dispersedly introduced into the distillation tower by using a liquid inlet pipe assembly to avoid concentrated feeding on one side of the distillation tower. The contact area between the dispersedly entering material and the tower body of the distillation tower through each longitudinal guide pipe is increased, and the tower body has a better heating and distillation effect on the material. The utility model solves the problem of concentrated liquid inlet in the existing distillation tower, improves the distillation separation efficiency, and achieves the purpose of quickly recovering ethanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is an axial cross-sectional view of the utility model.

[0017] In the figure: 1. liquid inlet pipe, 2. spare pipe mouth, 3. annular outer pipe, 4. tower body, 5. ethanol vapor outlet, 6. liquid collector, 7. ethanol recovery pipeline, 8. reflux pipeline, 9. inclined diverter pipe, 10. longitudinal guide pipe, 11. waste liquid outlet, 12. fin, 13. positioning orifice plate, 14. upper packing part, 15. lower packing part, 16. upper orifice plate, 17. lower orifice plate, 18. heating interlayer, 19. annular inner ring, 20. steam inlet, 21. steam outlet. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 , Figure 2 As shown, the distillation tower for ethanol recovery in the production of cyanodiester includes a tower body 4, a liquid inlet pipe assembly and fillers.

[0020] The liquid inlet pipe assembly includes an annular outer pipe 3 disposed outside the tower body 4, a feed pipe 1 connected to the annular outer pipe 3, an annular inner ring 19 disposed on the inner side wall of the tower body 4, a plurality of inclined shunt pipes 9 uniformly connected to the lower part of the annular outer pipe 3, and a plurality of longitudinal guide pipes 10 uniformly connected to the lower surface of the annular inner ring 19. The lower end of each inclined shunt pipe 9 is inserted into the annular inner ring 19, and the longitudinal guide pipe 10 is welded and fixed to the inner wall of the tower body 4.

[0021] An upper perforated plate 16 is supported above the annular inner ring 19, a lower perforated plate 17 is provided at the lower part of the tower body 4, the packing includes a lower packing part 15 arranged between the lower perforated plate 17 and the annular inner ring 19, and an upper packing part 14 arranged above the upper perforated plate 16, and a positioning perforated plate 13 is provided above the upper packing part 14. A gas phase rising space is formed between the positioning perforated plate 13 and the inner top surface of the tower body 4, and a plurality of fins 12 are provided on the inner top surface of the tower body 4. The upper packing part 14 and the lower packing part 15 are respectively formed by stacking multiple layers of corrugated plates, and a plurality of distance rods are provided between two adjacent corrugated plates, and a ventilation hole group is provided on the corrugated plates. The lower end of the longitudinal guide pipe 10 extends to below the lower perforated plate 17.

[0022] The top of the tower body 4 is provided with an ethanol vapor outlet 5, which is connected to a liquid trap 6 by a pipeline, the outlet of the liquid trap 6 is connected to an ethanol recovery pipeline 7, and the bottom of the liquid trap 6 is provided with a reflux pipeline 8, the end of which is inserted into the inner ring cavity of the annular inner ring 19. A heating interlayer 18 is provided on the outside of the tower body 4, a steam inlet 20 is provided at the bottom of the heating interlayer 18, and a steam outlet 21 is provided on the upper side of the heating interlayer 18. A spare pipe port 2 is provided on the feed pipe 1. A waste liquid discharge outlet 11 is provided at the bottom of the tower body 4.

[0023] Working principle:

[0024] The ethanol-containing waste liquid generated during the preparation of cyanodiester enters the annular outer tube 3 through the liquid inlet pipe 1, then enters the annular inner ring 19 through each inclined diverter pipe 9, and finally passes through each longitudinal guide pipe 10 to be guided to the bottom of the distillation tower against the wall. On the one hand, the purpose of diverting the liquid is achieved, and on the other hand, the material is prevented from affecting the rising steam of the boiling liquid surface. After the liquid is heated, the steam part reaches the gas phase rising space through the upper and lower packing parts 14 and 15, and after passing through the interception area of ​​the fin 12, it is discharged from the ethanol vapor outlet 5 to the liquid collector 6, and then discharged from the liquid collector 6 to the ethanol recovery pipeline 7, and the liquid captured in the liquid collector 6 is discharged to the inner ring cavity of the annular inner ring 19 through the reflux pipeline 8, and falls on the upper surface of the lower packing part 15 to continue to participate in distillation.

[0025] 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 distillation tower for ethanol recovery in cyanodiester production, comprising a tower body, a liquid inlet pipe assembly and a filler, characterized in that: The liquid inlet pipe assembly includes an annular outer tube arranged on the outside of the tower body, a feed pipe connected to the annular outer tube, an annular inner ring arranged on the inner side wall of the tower body, a plurality of inclined shunt pipes uniformly connected to the lower part of the annular outer tube, and a plurality of longitudinal guide pipes uniformly connected to the lower surface of the annular inner ring. The lower end of each inclined shunt pipe is inserted into the annular inner ring, and the longitudinal guide pipe is welded and fixed to the inner wall of the tower body. An upper orifice plate is supported above the annular inner ring, and a lower orifice plate is provided at the lower part of the tower body. The filler includes a lower filler part arranged between the lower orifice plate and the annular inner ring, and an upper filler part arranged above the upper orifice plate. A positioning orifice plate is provided above the upper filler part. An ethanol vapor outlet is provided at the top of the tower body, and the ethanol vapor outlet is connected to a liquid trap by a pipeline. The outlet of the liquid trap is connected to an ethanol recovery pipeline. A reflux pipeline is provided at the bottom of the liquid trap, and the end of the reflux pipeline is inserted into the inner ring cavity of the annular inner ring.

2. The ethanol recovery distillation tower in the cyanodiester production according to claim 1, characterized in that: A heating interlayer is arranged outside the tower body, a steam inlet is arranged at the bottom of the heating interlayer, and a steam outlet is arranged on the side surface of the upper end of the heating interlayer.

3. The ethanol recovery distillation tower in the cyanodiester production according to claim 1, characterized in that: A gas phase rising space is formed between the positioning hole plate and the inner top surface of the tower body, and a plurality of fins are arranged on the inner top surface of the tower body.

4. The ethanol recovery distillation tower in the production of cyanodiester according to claim 1, characterized in that: The upper filler part and the lower filler part are respectively formed by stacking multiple layers of corrugated plates, a plurality of distance rods are arranged between two adjacent corrugated plates, and a ventilation hole group is arranged on the corrugated plates.

5. The ethanol recovery distillation tower in the cyanodiester production according to claim 1, characterized in that: The lower end of the longitudinal guide tube extends to below the lower orifice plate.

6. The distillation tower for ethanol recovery in the production of cyanodiester according to claim 1, characterized in that: The feed pipe is provided with a spare pipe opening.

7. The ethanol recovery distillation tower in the production of cyanodiester according to claim 1, characterized in that: A waste liquid discharge outlet is provided at the bottom of the tower body.

Images