An apparatus for reducing the ethylene glycol content in distilled esterification water

Abstract

This utility model discloses a device for reducing the ethylene glycol content in distilled esterification water within the field of esterification water treatment. The device includes a wastewater treatment tank, with its bottom outlet connected to the inlet of a treatment pump via a pipeline. A process steam outlet is located at the top of the process tower, and a purified ethylene glycol outlet is located at the bottom of the process tower. The process steam outlet is connected to the inlet at the top of a condensate wastewater collection tank via a pipeline. The bottom outlet of the condensate wastewater collection tank is connected to the inlet of a first circulation pump via a pipeline. The outlet of the first circulation pump is connected to a spray inlet on the upper side of the process tower via a spray pipe. The purified ethylene glycol outlet at the bottom of the process tower is connected to the inlet of a second circulation pump via a pipeline. The outlet of the second circulation pump is connected to an ethylene glycol collection tank via a second pipeline. This utility model improves the treatment of esterification water separated from waste ethylene glycol after distillation, further reducing the ethylene glycol content in the esterification water.

Description

Technical Field

[0001] This utility model belongs to the field of esterification water treatment, and specifically relates to a device for reducing the ethylene glycol content in distilled esterification water. Background Technology

[0002] Currently, the ethylene glycol content in the esterified water distilled from the ethylene glycol recovery tower is approximately 40%-60%. Direct discharge to the power station affects the treatment efficiency of the stripping tower, resulting in high COD content in the discharged wastewater, failing to meet emission standards. The exhaust gas generated after stripping in the stripping tower enters the TO furnace (direct-fired incinerator) for combustion. If the concentration of the esterified water is unstable, the exhaust gas after stripping will cause unstable furnace temperature and negative pressure in the TO furnace. Furthermore, if the esterified water contains a large amount of impurities, it will cause the boiler combustion to generate a large amount of dust, clogging the flue and furnace. Therefore, it is urgent to further treat the esterified water to reduce the ethylene glycol content. Utility Model Content

[0003] The purpose of this invention is to provide a device for reducing the ethylene glycol content in distilled esterified water. This device can improve the esterified water separated from waste ethylene glycol after distillation, further reducing the ethylene glycol content in the esterified water, so that the esterified water can meet the standard for direct delivery to the power plant for incineration, thus avoiding affecting the normal operation of the power plant stripping tower and direct-fired incinerator.

[0004] The purpose of this utility model is achieved as follows: A device for reducing the ethylene glycol content in distilled esterification water includes a wastewater treatment tank. The bottom outlet of the wastewater treatment tank is connected to the inlet of a treatment pump via a pipeline. The outlet of the treatment pump is connected to the treatment inlet on the side of a process tower via a first pipeline. The top of the process tower has a process steam outlet, and the bottom of the process tower has a purified ethylene glycol outlet. The process steam outlet is connected to the inlet at the top of a condensate wastewater collection tank via a pipeline. The bottom outlet of the condensate wastewater collection tank is connected to the inlet of a first circulation pump via a pipeline. The outlet of the first circulation pump is connected to the spray inlet on the upper side of the process tower via a spray pipeline. The purified ethylene glycol outlet at the bottom of the process tower is connected to the inlet of a second circulation pump via a pipeline. The outlet of the second circulation pump is connected to the ethylene glycol collection tank via a second pipeline.

[0005] In operation, the esterified water treated by the ethylene glycol recovery tower is fed into a wastewater treatment tank. Then, a treatment pump draws the esterified water into a process tower for further treatment. Both the process tower and the ethylene glycol recovery tower are purification devices that utilize the different boiling points of different substances to heat and separate ethylene glycol and water in the esterified water. The process tower heats the esterified water, and the low-boiling-point vapor of the water is discharged from the top of the process tower into a condensate wastewater collection tank. A circulation pump one draws the condensate into the process tower to spray ethylene glycol, causing the ethylene glycol to enter the bottom of the tower. A second circulation pump draws the ethylene glycol into the ethylene glycol collection tank. Compared with existing technologies, the beneficial effects of this invention are: it allows for secondary distillation of the esterified water, reducing the ethylene glycol content in the esterified water. This invention is mainly used in the esterified water discharge pipeline of the ethylene glycol recovery tower and in the process tower.

[0006] As a further improvement of this utility model, branch pipe one and branch pipe two are respectively connected to the side of the first pipe. Branch pipe one is connected to the power station and is equipped with a valve. Branch pipe two is connected to the ethylene glycol recovery tower. The esterified water treated in the ethylene glycol recovery tower is fed into the wastewater treatment tank. The valve is closed, allowing the esterified water to enter the process tower for further treatment. Branch pipe two is connected to the spray inlet on the side of the ethylene glycol recovery tower, and part of the esterified water enters the ethylene glycol recovery tower as spray water to spray the ethylene glycol in the recovery tower, causing it to fall to the bottom of the recovery tower.

[0007] As a further improvement of this utility model, a circulation return pipe is connected to the side of the second branch pipe, and the circulation return pipe is connected to the circulating water inlet at the top of the wastewater treatment tank. The circulation return pipe circulates a portion of the esterified water back into the wastewater treatment tank to achieve pressure stabilization.

[0008] As a further improvement of this utility model, branch pipe three and branch pipe four are respectively connected to the side of the spray pipe. Branch pipe three is connected to the power station, and branch pipe four is connected to the circulation inlet on the side of the condensate wastewater collection tank. Part of the condensate is circulated back into the condensate wastewater collection tank, and part of the condensate is circulated back into the power station.

[0009] As a further improvement of this utility model, branch reflux pipes are connected to both sides of the pipeline, and the branch reflux pipes are connected to the ethylene glycol reflux inlet on the lower side of the process tower. The branch reflux pipes reflux a portion of the ethylene glycol into the process tower to replenish the liquid level and relieve pressure. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] The components include: 1. Wastewater treatment tank; 2. Treatment pump; 3. Pipeline 1; 4. Process tower; 5. Condensate wastewater collection tank; 6. Circulation pump 1; 7. Spray pipe; 8. Circulation pump 2; 9. Pipeline 2; 10. Ethylene glycol collection tank; 11. Branch pipe 1; 12. Branch pipe 2; 13. Power station; 14. Valves; 15. Ethylene glycol recovery tower; 16. Circulation return pipe; 17. Branch pipe 3; 18. Branch pipe 4; 19. Branch return pipe. Detailed Implementation

[0012] like Figure 1 As shown, this is an apparatus for reducing the ethylene glycol content in distilled esterification water. It includes a wastewater treatment tank 1. The bottom outlet of the wastewater treatment tank 1 is connected to the inlet of a treatment pump 2 via a pipeline. The outlet of the treatment pump 2 is connected to the treatment inlet on the side of a process tower 4 via a pipeline 3. The top of the process tower 4 has a process steam outlet, and the bottom of the process tower 4 has a purified ethylene glycol outlet. The process steam outlet is connected to the inlet at the top of a condensate wastewater collection tank 5 via a pipeline. The bottom outlet of the condensate wastewater collection tank 5 is connected to the inlet of a circulation pump 6 via a pipeline. The outlet of the circulation pump 6 is connected to the spray inlet on the upper side of the process tower 4 via a spray pipeline 7. The purified ethylene glycol outlet at the bottom of the process tower 4 is connected to the inlet of a circulation pump 8 via a pipeline. The outlet of the circulation pump 8 is connected to an ethylene glycol collection tank 10 via a pipeline 9.

[0013] Branch pipe 11 and branch pipe 12 are connected to the side of pipe 3. Branch pipe 11 is connected to power station 13 and is equipped with valve 14. Branch pipe 12 is connected to ethylene glycol recovery tower 15. The esterified water treated in ethylene glycol recovery tower 15 is fed into wastewater treatment tank 1. Valve 14 is closed, allowing the esterified water to enter process tower 4 for further treatment. Branch pipe 12 is connected to the spray inlet on the side of ethylene glycol recovery tower 15, allowing some of the esterified water to enter the ethylene glycol recovery tower 15 as spray water, spraying the ethylene glycol in the recovery tower so that it falls to the bottom of the recovery tower. A circulation return pipe 16 is connected to the side of branch pipe 12, and the circulation return pipe 16 is connected to the circulating water inlet at the top of wastewater treatment tank 1. The circulation return pipe 16 circulates some of the esterified water back into wastewater treatment tank 1 to achieve pressure stabilization.

[0014] The side of the spray pipe 7 is connected to branch pipe 3 17 and branch pipe 4 18 respectively. Branch pipe 3 17 is connected to power station 13, and branch pipe 4 18 is connected to the circulation inlet on the side of condensate wastewater collection tank 5. Part of the condensate is recycled back into condensate wastewater collection tank 5, and part of the condensate is recycled back into power station 13.

[0015] A branch reflux pipe 19 is connected to the side of pipe 29, and the branch reflux pipe 19 is connected to the ethylene glycol reflux inlet on the lower side of process tower 4. The branch reflux pipe 19 refluxes part of the ethylene glycol back into process tower 4 to replenish the liquid level and relieve pressure.

[0016] In operation, the esterified water treated by the ethylene glycol recovery tower 15 is fed into the wastewater treatment tank 1. Then, the treatment pump 2 pumps the esterified water into the process tower 4 for further treatment. Both the process tower 4 and the ethylene glycol recovery tower 15 are purification devices that utilize the different boiling points of different substances to heat and separate ethylene glycol and water in the esterified water. The process tower 4 heats the esterified water, and the low-boiling-point vapor of the water is discharged from the top of the process tower 4 into the condensate wastewater collection tank 5. The first circulation pump 6 pumps the condensate into the process tower 4 to spray ethylene glycol, causing the ethylene glycol to enter the bottom of the tower. The second circulation pump 8 pumps the ethylene glycol into the ethylene glycol collection tank 10. The advantage of this invention is that it allows for secondary distillation of the esterified water, reducing the ethylene glycol content. This invention is mainly used in the esterified water discharge pipeline of the ethylene glycol recovery tower 15 and in the process tower 4.

[0017] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. An apparatus for reducing the ethylene glycol content in distilled esterification water, characterized in that, The system includes a wastewater treatment tank. The bottom outlet of the wastewater treatment tank is connected to the inlet of a treatment pump via a pipeline. The outlet of the treatment pump is connected to the treatment inlet on the side of the process tower via a first pipeline. The top of the process tower has a process steam outlet, and the bottom of the process tower has a purified ethylene glycol outlet. The process steam outlet is connected to the inlet at the top of a condensate wastewater collection tank via a pipeline. The bottom outlet of the condensate wastewater collection tank is connected to the inlet of a first circulation pump via a pipeline. The outlet of the first circulation pump is connected to the spray inlet on the upper side of the process tower via a spray pipeline. The purified ethylene glycol outlet at the bottom of the process tower is connected to the inlet of a second circulation pump via a pipeline. The outlet of the second circulation pump is connected to the ethylene glycol collection tank via a second pipeline.

2. The apparatus for reducing the content of ethylene glycol in water in rectified esterification according to claim 1, characterized in that, The side of the first pipeline is connected to a branch pipe 1 and a branch pipe 2. The branch pipe 1 is connected to the power station and is equipped with a valve. The branch pipe 2 is connected to the ethylene glycol recovery tower.

3. The apparatus for reducing the content of ethylene glycol in water in rectified esterification according to claim 2, characterized in that, The side of the second branch pipe is connected to a circulation return pipe, which is connected to the circulating water inlet at the top of the wastewater treatment tank.

4. The apparatus for reducing the ethylene glycol content in distilled esterification water according to any one of claims 1-3, characterized in that, The spray pipe is connected to branch pipe three and branch pipe four on its side. Branch pipe three is connected to the power station, and branch pipe four is connected to the circulation inlet on the side of the condensate wastewater collection tank.

5. The apparatus for reducing the ethylene glycol content in distilled esterification water according to any one of claims 1-3, characterized in that, The pipeline has branch reflux pipes connected to both sides, and the branch reflux pipes are connected to the ethylene glycol reflux inlet on the lower side of the process tower.

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