Rectification and purification device for neopentyl glycol

Abstract

The utility model belongs to the technical field of separating devices, and particularly relates to a neopentyl glycol rectifying and purifying device which comprises a rectifying tower and a purifying tower, the bottom of the rectifying tower is connected with the middle of the purifying tower, the bottom of the rectifying tower is connected with a first reboiling heat exchanger, the middle of the rectifying tower is connected with a material pipeline and a steam ejector, and an electric heater is arranged on the upper portion of the rectifying tower. The top of the rectifying tower is connected with a heat exchanger I, and the lower part of the heat exchanger I is connected with a storage tank I; the bottom of the purifying tower is connected with a reboiling heat exchanger II, the top of the purifying tower is connected with a heat exchanger II, the lower part of the heat exchanger II is connected with a storage tank II, and the bottom of the storage tank II is respectively connected with the upper part of the purifying tower and the product pipeline. According to the utility model, a double-tower rectification purification mode is adopted for operation, so that the purification efficiency and the yield of neopentyl glycol can be improved; most of light-phase components can be distilled out through the rectifying tower, so that the content of the light-phase components is reduced, and the yield of neopentyl glycol is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of separation devices, and specifically relates to a rectification and purification device for neopentyl glycol. Background Art

[0002] Neopentyl glycol is an important raw material for chemical production. Usually, distillation technology is used to separate the neopentyl glycol mixed solution with high purity. Because neopentyl glycol is easily soluble in water, lower alcohols, lower ketones, ethers and aromatic compounds, it is impossible to fully extract neopentyl glycol by ordinary single distillation during production, which will result in low yield and poor quality of neopentyl glycol.

[0003] At present, in the operation process of separating the neopentyl glycol product, the waste gas discharged from the distillation tower is not distilled again, and the small amount of neopentyl glycol product in the waste gas will be discharged into the air and cause waste; and the raw material mixed solution is directly added to the bottom of the distillation tower, which easily leads to a reduction in the contact area between the raw material mixed solution and water vapor, thereby affecting the distillation effect. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: to provide a distillation and purification device for neopentyl glycol, to achieve distillation and purification of neopentyl glycol, to improve the purity of the neopentyl glycol product, and to improve the distillation and purification efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The distillation and purification device of neopentyl glycol described in the utility model comprises a distillation tower and a purification tower, the bottom of the distillation tower is connected with the middle of the purification tower, the bottom of the distillation tower is connected with a reboiling heat exchanger 1, the middle of the distillation tower is connected with a material pipeline and a steam ejector, the upper part of the distillation tower is provided with an electric heater, the top of the distillation tower is connected with a heat exchanger 1, the lower part of the heat exchanger is connected with a storage tank 1, and the bottom of the storage tank 1 is connected with the upper part of the distillation tower; the bottom of the purification tower is connected with a reboiling heat exchanger 2, the top of the purification tower is connected with a heat exchanger 2, the lower part of the heat exchanger 2 is connected with a storage tank 2, and the bottom of the storage tank 2 is respectively connected with the upper part of the purification tower and the product pipeline.

[0007] in:

[0008] The top of the reboiler heat exchanger is connected to the bottom of the distillation tower.

[0009] The reboiler heat exchanger 1 is a siphon heat exchanger.

[0010] A material pump is arranged on the pipeline connecting the distillation tower and the purification tower.

[0011] A material pump is arranged on the pipeline connected to the outlet of the storage tank.

[0012] The bottom of the reboiler heat exchanger 2 is connected with a recovery pipe, the lower part of the heat exchanger is connected with the recovery pipe, and the bottom of the storage tank 1 is connected with the recovery pipe.

[0013] A material pump is arranged on the pipeline connecting the bottom of the purification tower and the second reboiler heat exchanger, and a material pump is arranged on the pipeline connecting the second reboiler heat exchanger and the recovery pipeline.

[0014] The second reboiler heat exchanger is a falling film evaporator.

[0015] The upper part of the second heat exchanger and the top of the second storage tank are both connected with steam pipelines.

[0016] A material pump is arranged on the pipeline connected to the outlet at the bottom of the second storage tank.

[0017] The beneficial effects of the utility model are:

[0018] The utility model adopts a double-tower distillation purification mode to operate, which can improve the purification efficiency and yield of neopentyl glycol; most of the light phase components can be evaporated through the distillation tower, the content of the light phase components can be reduced, and the yield of neopentyl glycol can be improved.

[0019] The distillation tower adopts three-stage heating, which can separate the light phase material from the neopentyl glycol as much as possible, and the light phase component is discharged from the top of the tower. The electric heater, steam ejector and reboiler heat exchanger are used together to increase the distillation rate of neopentyl glycol. During purification, it can ensure the separation of neopentyl glycol and heavy phase components, thereby improving the yield and purity of neopentyl glycol. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] In the figure: 1. Distillation tower; 2. Purification tower; 3. Storage tank 2; 4. Storage tank 1; 5. Reboiling heat exchanger 1; 6. Heat exchanger 1; 7. Reboiling heat exchanger 2; 8. Heat exchanger 2; 9. Material pipeline; 10. Steam ejector; 11. Electric heater; 12. Product pipeline; 13. Recovery pipeline; 14. Steam pipeline. DETAILED DESCRIPTION

[0022] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0023] Example 1

[0024] like Figure 1As shown, the distillation and purification device of neopentyl glycol described in the utility model comprises a distillation tower 1 and a purification tower 2, the bottom of the distillation tower 1 is connected to the middle of the purification tower 2, the bottom of the distillation tower 1 is connected to a reboiling heat exchanger 5, the middle of the distillation tower 1 is connected to a material pipeline 9 and a steam ejector 10, the upper part of the distillation tower 1 is provided with an electric heater 11, the top of the distillation tower 1 is connected to a heat exchanger 6, the lower part of the heat exchanger 6 is connected to a storage tank 4, and the bottom of the storage tank 4 is connected to the upper part of the distillation tower 1; the bottom of the purification tower 2 is connected to a reboiling heat exchanger 7, the top of the purification tower 2 is connected to a heat exchanger 8, the lower part of the heat exchanger 8 is connected to a storage tank 3, and the bottom of the storage tank 3 is respectively connected to the upper part of the purification tower 2 and the product pipeline 12.

[0025] The steam ejector 10 heats the neopentyl glycol mixed solution entering the middle of the distillation tower 1, and some light phase components can be discharged from the top of the distillation tower 1 in time. After the neopentyl glycol mixed solution enters the bottom of the distillation tower 1, it is fully heated by the reboiler heat exchanger 5 for distillation. The electric heater 11 can reheat the light phase components entering the upper part of the distillation tower 1 to increase the distillation rate of the distillation tower 1.

[0026] The top of the reboiler heat exchanger 5 is connected to the lower part of the distillation tower 1.

[0027] The reboiler heat exchanger 5 is a siphon heat exchanger. The neopentyl glycol mixed solution can enter the siphon heat exchanger through natural flow in the pipeline, thereby achieving heat transfer.

[0028] A material pump is provided on the pipeline connecting the distillation tower 1 and the purification tower 2.

[0029] A material pump is provided on the pipeline connected to the outlet of the storage tank 4.

[0030] The bottom of the reboiler heat exchanger 2 7 is connected to a recovery pipe 13, the lower part of the heat exchanger 1 6 is connected to the recovery pipe 13, and the bottom of the storage tank 1 4 is connected to the recovery pipe 13. The recovery pipe 13 can transport the waste components in the distillation and purification process to the recovery system for processing.

[0031] A material pump is provided on the pipeline connecting the bottom of the purification tower 2 and the reboiler heat exchanger 7 , and a material pump is provided on the pipeline connecting the reboiler heat exchanger 7 and the recovery pipeline 13 .

[0032] The reboiling heat exchanger 2 7 is a falling film evaporator. The falling film evaporator can fully heat and evaporate the crude neopentyl glycol and ensure that the crude neopentyl glycol does not change during the evaporation process.

[0033] The upper part of the heat exchanger 2 8 and the top of the storage tank 2 3 are both connected with a steam pipe 14 .

[0034] A material pump is provided on the pipeline connected to the bottom outlet of storage tank 2 3.

[0035] Working principle and process:

[0036] The prepared neopentyl glycol mixed solution is transported from the material pipeline 9 to the middle of the distillation tower 1, and the transported neopentyl glycol mixed solution is preliminarily heated by the steam ejector 10, so that part of the light phase components are discharged from the top of the distillation tower 1, and the remaining neopentyl glycol mixed solution flows to the bottom of the distillation tower 1, and is heated by the reboiling heat exchanger-5 and then transported back to the distillation tower 1. The distillation tower 1 is operated under the condition of -0.085MPa, and the light phase components are vaporized and rise to the upper part of the distillation tower 1, and are heated again by the electric heater 11 and discharged from the top of the distillation tower 1. The vaporized light phase components are condensed by the heat exchanger-6, and the condensed condensate enters the storage tank-4 and is re-transported at a reflux ratio of 0.3:1. The crude neopentyl glycol is sent back to the distillation tower 1, and the other light phase components and the residual liquid that cannot be refluxed are recovered through the recovery pipe 13. After the distillation is completed, the crude neopentyl glycol at the bottom of the distillation tower 1 is transported to the purification tower 2 for purification. The purification tower 2 is operated under the condition of -0.095MPa. The crude neopentyl glycol is heated by the reboiling heat exchanger 2 7 at the bottom of the purification tower 2, and the vaporized neopentyl glycol product is discharged from the top of the purification tower 2 and condensed by the heat exchanger 2 8 to obtain the neopentyl glycol product. The neopentyl glycol product enters the storage tank 2 3 for storage and is transported through the product pipeline 12 for use. The heavy phase component at the bottom of the purification tower 2 is treated by the reboiling heat exchanger 2 7 and then recovered through the recovery pipe 13.

Claims

1. A distillation and purification device for neopentyl glycol, comprising a distillation tower (1) and a purification tower (2), wherein the bottom of the distillation tower (1) is connected to the middle of the purification tower (2), characterized in that: The bottom of the distillation tower (1) is connected to a reboiling heat exchanger 1 (5), the middle of the distillation tower (1) is connected to a material pipeline (9) and a steam ejector (10), the upper part of the distillation tower (1) is provided with an electric heater (11), the top of the distillation tower (1) is connected to a heat exchanger 1 (6), the lower part of the heat exchanger 1 (6) is connected to a storage tank 1 (4), and the bottom of the storage tank 1 (4) is connected to the upper part of the distillation tower (1); the bottom of the purification tower (2) is connected to a reboiling heat exchanger 2 (7), the top of the purification tower (2) is connected to a heat exchanger 2 (8), the lower part of the heat exchanger 2 (8) is connected to a storage tank 2 (3), and the bottom of the storage tank 2 (3) is respectively connected to the upper part of the purification tower (2) and a product pipeline (12).

2. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: The top of the reboiler heat exchanger 1 (5) is connected to the bottom of the distillation tower (1).

3. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: The reboiler heat exchanger 1 (5) is a siphon type heat exchanger.

4. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: A material pump is provided on the pipeline connecting the distillation tower (1) and the purification tower (2).

5. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: A material pump is provided on the pipeline connected to the outlet of storage tank 1 (4).

6. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: The bottom of the reboiler heat exchanger 2 (7) is connected to a recovery pipe (13), the lower part of the heat exchanger 1 (6) is connected to the recovery pipe (13), and the bottom of the storage tank 1 (4) is connected to the recovery pipe (13).

7. The distillation and purification device for neopentyl glycol according to claim 6, characterized in that: A material pump is provided on the pipeline connecting the bottom of the purification tower (2) and the second reboiler heat exchanger (7), and a material pump is provided on the pipeline connecting the second reboiler heat exchanger (7) and the recovery pipeline (13).

8. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: Reboiler heat exchanger 2 (7) is a falling film evaporator.

9. The distillation and purification device for neopentyl glycol according to claim 1, characterized in that: The upper part of the second heat exchanger (8) and the top of the second storage tank (3) are both connected to a steam pipeline (14).

10. The device for rectifying and purifying neopentyl glycol according to claim 1, characterized in that: A material pump is provided on the pipeline connected to the bottom outlet of storage tank 2 (3).

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