A distillation tower waste liquid discharge device

Abstract

The utility model relates to the technical field of hydrofluoric acid production equipment, and specifically to a distillation tower waste liquid discharge device. A distillation tower waste liquid discharge device of the present application includes a first tower body, a second tower body, and a third tower body, wherein the first tower body, the second tower body, and the third tower body are interconnected and arranged in a stepped manner, and waste discharge pipes are provided at the bottom of the first tower body, the second tower body, and the third tower body, and the waste discharge pipes between the first tower body, the second tower body, and the third tower body are interconnected, so that a height difference is formed between the tower bodies, and automatic and continuous discharge of waste liquid in the tower bodies is realized; the tops of the first tower body, the second tower body, and the third tower body are all fixedly connected with an air outlet pipe, and the air outlet pipe is connected with a condensation component for condensing steam discharged from the gas phase outlet of the tower body, and the discharge end of the condensation component extends to the inside of the tower body, thereby realizing the preparation of electronic-grade hydrofluoric acid, ensuring the quality of the product, and preventing external impurities from entering the tower body to contaminate the electronic-grade hydrofluoric acid.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrofluoric acid production equipment, in particular to a distillation tower waste liquid discharge device. Background Art

[0002] Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas. It is a clear, colorless, fuming, corrosive liquid with a strong pungent odor. Due to its ability to dissolve oxides, hydrofluoric acid plays an important role in the purification of aluminum and uranium. Hydrofluoric acid can also be used to etch glass, engrave patterns, mark scales and text. In the semiconductor industry, it can be used to remove oxides from the silicon surface. Therefore, electronic grade hydrofluoric acid is widely used in the electronics field.

[0003] In the prior art, the preparation of electronic-grade hydrofluoric acid needs to be obtained by distillation of anhydrous hydrofluoric acid. In the process of anhydrous hydrofluoric acid entering the distillation tower for distillation, in order to maintain product quality, the reboilers of the three towers need to maintain a certain proportion of drainage and regularly remove the impurities concentrated in the tower. The current method is to manually open the bottom discharge valve on site and discharge the bottom deposited impurities into the waste acid system. On the one hand, there are safety operation risks in the discharge process, and on the other hand, the discharge operation can only be intermittent and cannot be continuous.

[0004] Therefore, there is an urgent need to provide a discharge device that is safe in operation and can sustainably discharge the waste liquid from the bottom of the distillation tower. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a distillation tower waste liquid discharge device.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a distillation tower waste liquid discharge device, including a tower body, the tower body including a first tower body, a second tower body, and a third tower body, the first tower body, the second tower body, and the third tower body are interconnected and arranged in a stepped manner, the bottoms of the first tower body, the second tower body, and the third tower body are each provided with a waste discharge pipe, and the waste discharge pipes between the first tower body, the second tower body, and the third tower body are interconnected; the tops of the first tower body, the second tower body, and the third tower body are each fixedly connected with an air outlet pipe, the air outlet pipe is connected to a condensation component for condensing steam discharged from the gas phase outlet of the tower body, and the discharge end of the condensation component extends to the interior of the tower body.

[0007] Furthermore, the condensation component includes a condenser, and a discharge pipe is provided at the discharge end of the condenser, and the pipe mouth of the discharge pipe extends to the interior of the tower body.

[0008] Furthermore, the condenser includes a first condenser, a second condenser, and a third condenser. The first condenser is respectively connected to the third tower body and the second tower body; the second condenser is respectively connected to the second tower body and the first tower body; the third condenser is connected to the first tower body, and a hydrofluoric acid collection tank is connected to its discharge pipe.

[0009] Furthermore, a partition is installed in the tower body for dividing the interior of the tower body into two separated upper and lower areas, and a first through hole penetrating the partition is opened on the partition, and a flow equalizing tube is inserted in the first through hole.

[0010] Furthermore, a diverter hood with its opening downward and covering the partition is sleeved at the pipe mouth of the discharge pipe, and second through holes are evenly opened on the side wall of the diverter hood in a circumferential direction, and the height of the second through holes is lower than the pipe mouth height at the upper end of the equalizing pipe.

[0011] Furthermore, the first through holes are evenly opened on the partition plate surface located at the periphery of the diverter cover.

[0012] Furthermore, the end of the flow equalizing tube extending to the tube opening above the partition is arranged in a flush shape.

[0013] Furthermore, the height of the outlet of the liquid discharge pipe is lower than the height of the outlet at the upper end of the flow equalizing pipe.

[0014] Furthermore, it also includes three funnel-shaped buffer tanks, which are connected to the waste pipe.

[0015] Furthermore, it also includes a waste acid treatment tank, which is connected to the liquid outlet of the buffer tank of the first tower body.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] 1. The present application provides a first tower body, a second tower body, and a third tower body that are interconnected and arranged in a stepped manner, so that a height difference is formed in the tower bodies, so that the waste liquid can automatically flow out under the action of its own gravity, and be discharged from the waste discharge pipe to the waste acid treatment tank from top to bottom in sequence, thereby realizing the continuous discharge of the waste liquid in the tower body.

[0018] 2. The present application realizes the preparation of electronic-grade hydrofluoric acid by installing a condensation assembly on the tower body, and the discharge end of the condensation assembly extends to the inside of the tower body, thereby ensuring the quality of the product and preventing external impurities from entering the tower body and contaminating the electronic-grade hydrofluoric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the distillation tower waste liquid discharge device in the preferred embodiment of the utility model;

[0020] Figure 2This is a schematic diagram of the internal structure of the tower body in a preferred embodiment of the utility model;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure numerals: 1. tower body; first tower body 101, second tower body 102, third tower body 103; 2. waste pipe; 3. exhaust pipe; 4. condensation assembly; 401. condenser; 402. drain pipe; 5. partition; 6. diverter hood; 7. buffer tank; 8. waste acid treatment tank; 9. hydrofluoric acid collection tank; 10. diverter hood. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-Figure 3 As shown in the preferred embodiment of the utility model, a waste liquid discharge device for a distillation tower comprises a tower body 1, wherein the tower body comprises a first tower body 101, a second tower body 102, and a third tower body 103, wherein the first tower body 101, the second tower body 102, and the third tower body 103 are interconnected and arranged in a stepped manner, and waste discharge pipes 2 are arranged at the bottom of the first tower body 101, the second tower body 102, and the third tower body 103, and the waste discharge pipes 2 between the first tower body 101, the second tower body 102, and the third tower body 103 are interconnected, so that the tower bodies form a height difference, thereby making the waste liquid The liquid can automatically flow out under the action of its own gravity, and is discharged from the waste pipe to the waste acid treatment tank from top to bottom in turn, so as to realize the continuous discharge of waste liquid in the tower body; the tops of the first tower body 101, the second tower body 102, and the third tower body 103 are fixedly connected with an outlet pipe 3, and the outlet pipe 3 is connected with a condensation component 4 for condensing the steam discharged from the gas phase outlet of the tower body, and the discharge end of the condensation component 4 extends to the inside of the tower body 1, so as to realize the preparation of electronic grade hydrofluoric acid, ensure the quality of the product, and prevent external impurities from entering the tower body and contaminating the electronic grade hydrofluoric acid.

[0025] As a preferred embodiment of the utility model, it may also have the following additional technical features: the condensation assembly 4 includes a condenser 401, the discharge end of the condenser 401 is provided with a discharge pipe 402, the pipe mouth of the discharge pipe 402 extends to the inside of the tower body 1, and the condenser 401 includes a first condenser, a second condenser, and a third condenser, the first condenser is respectively connected to the third tower body 103 and the second tower body 102; the second condenser is respectively connected to the second tower body 102 and the first tower body 101; the third condenser is connected to the first tower body 101, and its discharge pipe is connected to a hydrofluoric acid collection tank 9. Thus, the continuous purification of hydrofluoric acid is achieved, and electronic grade hydrofluoric acid is finally obtained.

[0026] In this embodiment, a partition 5 is installed in the tower body 1 to divide the interior of the tower body 1 into two areas separated by an upper and a lower area. The partition 5 is provided with a first through hole penetrating the partition 5, and a flow equalizing pipe 6 is inserted into the first through hole. In this way, the condensate can be evenly distributed in the tower body 1, thereby improving the distillation effect.

[0027] In this embodiment, a flow divider 10 with its opening facing downward and covering the partition 5 is sleeved at the outlet of the liquid discharge pipe 402, and second through holes are evenly opened in the circumferential direction of the side wall of the flow divider 10, and the height of the second through holes is lower than the outlet height of the upper end of the flow equalizing pipe 6. In this way, large fluctuations in the liquid level can be prevented, and uniform distribution of the condensate can be ensured.

[0028] In this embodiment, the first through holes are evenly opened on the plate surface of the partition plate 5 located outside the flow divider 6; the end of the pipe opening of the flow equalizing pipe 6 extending to the top of the partition plate 5 is arranged in a flush shape; and the pipe opening height of the drain pipe 402 is lower than the height of the pipe opening at the upper end of the flow equalizing pipe 6. In this way, the condensate can be evenly distributed in the distillation tower, thereby improving the distillation efficiency.

[0029] In this embodiment, three funnel-shaped buffer tanks 7 are further included, and the buffer tanks 7 are connected to the waste discharge pipe 2. Thus, the diversion phenomenon of the waste liquid can be avoided and the quality of the distillation can be ensured.

[0030] In this embodiment, a waste acid treatment tank 8 is further included, and the waste acid treatment tank 8 is connected to the liquid outlet of the buffer tank 7 of the first tower body 101. Thus, the recovery of waste liquid is achieved.

[0031] The working principle of the utility model is as follows: by setting a first tower body 101, a second tower body 102, and a third tower body 103 which are interconnected and arranged in a stepped manner, a height difference is formed in the tower bodies, so that the waste liquid can automatically flow out under the action of its own gravity, and be discharged from the waste discharge pipe to the waste acid treatment tank from top to bottom in sequence, thereby realizing the continuous discharge of the waste liquid in the tower body.

[0032] By installing a condensation assembly on the tower body 1, the discharge end of the condensation assembly extends into the interior of the tower body 1, thereby achieving the preparation of electronic-grade hydrofluoric acid, ensuring the quality of the product, and preventing external impurities from entering the tower body to contaminate the electronic-grade hydrofluoric acid.

[0033] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0034] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A distillation tower waste liquid discharge device, characterized in that: It includes a tower body, which includes a first tower body, a second tower body, and a third tower body. The first tower body, the second tower body, and the third tower body are interconnected and arranged in a stepped manner. The bottoms of the first tower body, the second tower body, and the third tower body are each provided with a waste pipe, and the waste pipes between the first tower body, the second tower body, and the third tower body are interconnected; the tops of the first tower body, the second tower body, and the third tower body are each fixedly connected with an air outlet pipe, and the air outlet pipe is connected to a condensation component for condensing steam discharged from a gas phase outlet of the tower body, and the discharge end of the condensation component extends to the interior of the tower body.

2. The distillation tower waste liquid discharge device according to claim 1, characterized in that: The condensation assembly comprises a condenser, a discharge end of the condenser is provided with a discharge pipe, and a pipe mouth of the discharge pipe extends to the inside of the tower body.

3. The distillation tower waste liquid discharge device according to claim 2, characterized in that: The condenser includes a first condenser, a second condenser, and a third condenser. The first condenser is connected to the third tower body and the second tower body respectively; the second condenser is connected to the second tower body and the first tower body respectively; the third condenser is connected to the first tower body, and a hydrofluoric acid collection tank is connected to its discharge pipe.

4. The distillation tower waste liquid discharge device according to claim 3, characterized in that: The tower body is provided with a partition plate for dividing the interior of the tower body into two separated upper and lower areas. The partition plate is provided with a first through hole penetrating the partition plate, and a flow equalizing tube is inserted into the first through hole.

5. The distillation tower waste liquid discharge device according to claim 4, characterized in that: The outlet of the liquid discharge pipe is sleeved with a flow divider cover which opens downward and covers the partition plate. The side wall of the flow divider cover is evenly provided with second through holes in the circumferential direction. The height of the second through holes is lower than the outlet height of the upper end of the flow equalizing pipe.

6. The distillation tower waste liquid discharge device according to claim 5, characterized in that: The first through holes are evenly opened on the partition plate surface located at the periphery of the splitter cover.

7. The distillation tower waste liquid discharge device according to claim 4, characterized in that: The end of the pipe opening of the flow equalizing pipe extending to the top of the partition is arranged in a flush shape.

8. The distillation tower waste liquid discharge device according to claim 4, characterized in that: The height of the outlet of the liquid discharge pipe is lower than the height of the outlet of the upper end of the flow equalizing pipe.

9. The distillation tower waste liquid discharge device according to claim 1, characterized in that: It also includes three funnel-shaped buffer tanks, which are connected to the waste pipe.

10. The distillation tower waste liquid discharge device according to claim 9, characterized in that: It also includes a waste acid treatment tank, which is connected to the liquid outlet of the buffer tank of the first tower body.

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