CN219023842U

CN219023842U - Electronic hydrochloric acid absorption system

Info

Publication number: CN219023842U
Application number: CN202223552286.3U
Authority: CN
Inventors: 欧阳腾; 刘鹏程; 冉孟林; 罗小容
Original assignee: Huarong Chemical Chengdu Co ltd
Current assignee: Huarong Chemical Chengdu Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-16
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses an electronic hydrochloric acid absorption system, which relates to the field of electronic hydrochloric acid production equipment and comprises an absorption tower I, an absorption tower II, a heat exchanger I, a heat exchanger II, a circulating tank and a circulating pump, wherein the absorption tower I, the absorption tower II, the heat exchanger I and the circulating pump are sequentially connected, the absorption tower I is provided with a circulating hydrochloric acid inlet and a hydrochloric acid extraction outlet, the absorption tower II is provided with an acid extraction inlet, the outlet end of the circulating pump is connected with the circulating hydrochloric acid inlet, and the heat exchanger I is connected between the hydrochloric acid extraction outlet and the acid extraction inlet. The utility model has simple structure, large contact area of gas and liquid phases and high heat exchange efficiency, so that N-PTFE and PFA materials with extremely poor heat conduction performance and high purity can be adopted to produce high-purity and high-quality G4-G5 electronic hydrochloric acid.

Description

Electronic hydrochloric acid absorption system

Technical Field

The utility model relates to the field of electronic hydrochloric acid production equipment, in particular to an electronic hydrochloric acid absorption system.

Background

The content of the metal impurities in the G4-G5 electronic hydrochloric acid is required to be less than 100ppt, the mass concentration is about 36% -38%, and the raw materials of the production equipment are strictly selected besides the high requirements on the raw materials for producing the high-purity hydrochloric acid. In order to prevent precipitation of metal impurities during production, N-PTFE and PFA are generally required to be selected as raw materials for the production apparatus.

The conventional hydrochloric acid absorption devices all adopt falling film absorption towers, for example, patent documents with publication numbers of CN206276205U, CN101723327A and the like, and the device has simple structure and higher heat exchange efficiency, but because the surface tension of plastics such as N-PTFE, PFA and the like is higher, film cannot be formed on the surface well, the device can only adopt graphite, quartz, glass fiber reinforced plastic and the like as raw materials of production equipment, and the obtained hydrochloric acid can only reach high-grade purity generally; the hydrochloric acid absorption systems provided in patent documents with application numbers of CN202021065955.2, CN201821004117.7 and CN20211081611.7 adopt a packed tower as an absorption tower, so that the selection range of raw materials of equipment is enlarged, but the structures of the systems are complex, an intermediate extraction heat exchange system is lacked, and because the heat conduction performance of N-PTFE and PFA is extremely poor, the systems can only select common plastics such as PP, PE and the like as raw materials of production equipment, and the obtained hydrochloric acid can only reach EL grade.

Therefore, a new electronic hydrochloric acid absorption system is urgently needed, and the N-PTFE and PFA materials with very high purity but extremely poor heat conduction performance are adopted as raw materials of equipment, and meanwhile, the production of high-purity and high-quality G4-G5 electronic hydrochloric acid is guaranteed.

Disclosure of Invention

The utility model aims to provide an electronic hydrochloric acid absorption system which has a simple structure, large contact area of gas and liquid phases and high heat exchange efficiency, so that N-PTFE and PFA materials with extremely poor heat conduction performance and very high purity can be adopted to produce high-purity and high-quality G4-G5 electronic hydrochloric acid.

In order to achieve the aim of the utility model, the technical scheme adopted is as follows: the utility model provides an electron hydrochloric acid absorption system, including absorption tower I, absorption tower II, heat exchanger I, heat exchanger II, circulation tank and circulating pump, absorption tower I, absorption tower II, heat exchanger I and circulating pump connect gradually, have circulation hydrochloric acid import and hydrochloric acid extraction mouth on the absorption tower I, have on the absorption tower II and take out the sour import, and the exit end and the circulation hydrochloric acid access connection of circulating pump, heat exchanger I connects between hydrochloric acid extraction mouth and acid extraction import.

Further, the upper end of the absorption tower I is also provided with an ultrapure water inlet, the lower end of the absorption tower II is provided with a hydrogen chloride inlet, the circulating hydrochloric acid inlet is positioned in the middle of the absorption tower I, the absorption tower I and the absorption tower II are internally provided with first liquid distributors, the first liquid distributors in the absorption tower I are respectively positioned below the ultrapure water inlet and below the circulating hydrochloric acid inlet, and the first liquid distributors in the absorption tower II are positioned below the acid extraction inlet.

Further, the first liquid distributor comprises a first partition plate and a plurality of first gas risers penetrating through the first partition plate, and the upper ends of the first gas risers are higher than the upper surface of the first partition plate.

Further, the inner diameter of the first gas lift pipe is 15-20 mm, the length of the first gas lift pipe is 120-150 mm, and a plurality of V-shaped grooves are further formed in the upper edge of the first gas lift pipe.

Furthermore, the ultrapure water inlet, the circulating hydrochloric acid inlet and the acid extraction inlet are respectively internally provided with an insertion pipe, and the insertion pipes are provided with openings with downward openings.

Further, be provided with the backup pad that packs in absorption tower I, the absorption tower II, have a plurality of round holes in the backup pad that packs, and the backup pad that packs is located first liquid distributor below, still installs the subassembly that packs in the backup pad that packs.

Further, the packing component is pall ring packing.

Further, absorption tower I, absorption tower II are split type structure, and the hydrochloric acid adopts the bottom that the export is located absorption tower I, and absorption tower I, absorption tower II upper end all are equipped with the silk screen demister, and absorption tower I, absorption tower II top all are equipped with the tail gas export, and the tail gas export on the absorption tower I is connected with absorption tower II lower extreme.

Further, the lower end of the absorption tower I is also provided with an air inlet, and a tail gas outlet on the absorption tower II is connected with the air inlet.

Further, absorption tower I, absorption tower II are monolithic structure, and absorption tower I upper end is equipped with the silk screen demister, and absorption tower I top all is equipped with the tail gas export.

Further, a second liquid distributor is further arranged at the joint of the absorption tower I and the absorption tower II, and the second liquid distributor is positioned between the hydrochloric acid extraction outlet and the acid extraction inlet.

Further, the second liquid distributor comprises a second partition plate and a second riser penetrating through the partition plate, a conical top is arranged on the top cover of the second riser, and rectangular holes are formed in the second riser and are higher than the hydrochloric acid extraction outlet.

Further, the inner diameter of the second gas lift pipe is 15-20 mm, the length of the second gas lift pipe is 400-500 mm, and the distance between the rectangular hole and the hydrochloric acid extraction outlet is more than 200mm.

The utility model has the advantages that,

1. the utility model has simple structure, adopts two-stage heat exchange, increases the heat exchange efficiency of the system, can use N-PTFE and PFA materials with high purity and extremely poor heat conduction performance as raw materials of equipment, ensures no precipitation of metal impurities in the production process, and can produce G4-G5 electronic hydrochloric acid.

2. The utility model can enable the hydrogen chloride entering the upper end of the absorption tower I to be absorbed by the ultrapure water fed through the ultrapure water inlet, and the hydrogen chloride entering the lower end of the absorption tower I to be absorbed by the circulating acid, thereby realizing the sectional absorption of the hydrogen chloride gas, greatly improving the absorption efficiency, reducing the emission of tail gas and enabling the absorption efficiency of the hydrogen chloride to reach more than 99.9 percent.

3. According to the utility model, the pall ring packing is adopted, so that the contact area of the gas phase and the liquid phase can be effectively increased.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model.

FIG. 1 is a system diagram of an electronic hydrochloric acid absorption system provided in example 1 of the present utility model;

FIG. 2 is a system diagram of an electronic hydrochloric acid absorption system provided in example 2 of the present utility model;

FIG. 3 is a schematic view of a first liquid distributor;

FIG. 4 is a schematic illustration of a second liquid distributor;

fig. 5 is a schematic view of the structure of the insertion tube.

The reference numerals and corresponding part names in the drawings:

1. the device comprises an absorption tower I, 2, a tail gas outlet, 3, a wire mesh demister, 4, an ultrapure water inlet, 5, a first liquid distributor, 6, a circulating hydrochloric acid inlet, 7, an absorption tower II, 8, an air inlet, 9, a hydrochloric acid extraction outlet, 10, an acid extraction inlet, 11, a filler supporting plate, 12, a filler assembly, 13, a hydrogen chloride inlet, 14, a gas-liquid balance port, 15, a second liquid distributor, 16, a hydrochloric acid outlet, 17, a heat exchanger I, 18, a heat exchanger II, 19, a circulating tank, 20, a circulating pump, 21 and an insertion pipe;

51. a first partition plate 52, a first riser, 53 and a V-shaped groove;

151. a second separator 152, a second riser 153, a cone roof 154 and rectangular holes;

211. an opening.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the utility model. It should be further noted that, for convenience of description, only the portions related to the present utility model are shown in the drawings.

In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision. The present utility model will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

As shown in fig. 1, the electronic hydrochloric acid absorption system provided in this embodiment includes an absorption tower i 1, an absorption tower ii 7, a heat exchanger i 17, a heat exchanger ii 18, a circulation tank 19 and a circulation pump 20, where the absorption tower i 1 and the absorption tower ii 7 are formed by jointly splicing a plurality of tower sections, and two adjacent tower sections are sealed and fixed by bolts; the bottom of the absorption tower I is provided with a hydrochloric acid outlet 16, the absorption tower I1, the absorption tower II 7, the heat exchanger I17 and the circulating pump 20 are sequentially connected to the hydrochloric acid outlet 16, the absorption tower I1 is provided with a circulating hydrochloric acid inlet 6 and a hydrochloric acid outlet 9, the circulating hydrochloric acid inlet 6 is positioned in the middle of the absorption tower I1, the hydrochloric acid outlet 9 is positioned at the lower end of the absorption tower I1, the outlet end of the circulating pump 20 is connected with the circulating hydrochloric acid inlet 6, and in order to facilitate the connection between the outlet end of the circulating pump 20 and the circulating hydrochloric acid inlet 6, the outlet end of the circulating pump 20 and the circulating hydrochloric acid inlet 6 can be particularly connected by adopting a circulating pipeline, so that the absorption tower I1, the absorption tower II 7, the heat exchanger II 18, the circulating tank 19 and the circulating pump 20 jointly form a circulating loop; the heat exchanger I17 is connected between the hydrochloric acid extraction port 9 and the acid extraction port 10.

When the system works, raw material purified hydrogen chloride gas is fed from the lower end of an absorption tower II 7, ultrapure water is fed from the upper end of an absorption tower I1, purified hydrogen chloride gas flows upwards, ultrapure water flows downwards, hydrochloric acid generated after the raw material purified hydrogen chloride gas contacts with the ultrapure water enters a heat exchanger I17 through a hydrochloric acid extraction port 9 to exchange heat, unabsorbed hydrogen chloride gas is continuously absorbed from an extracted acid inlet 10 into the absorption tower II 7, finally obtained electronic hydrochloric acid enters a circulation tank 19 after entering a heat exchanger II 18 through the absorption tower II 7 to exchange heat, hydrochloric acid entering the circulation tank 19 is partially delivered to a finished product tank through a circulation pump 20, and a part of hydrochloric acid is circularly absorbed from unabsorbed hydrogen chloride gas newly fed into the absorption tower I1 through a circulation acid inlet 6.

As a further improvement of the embodiment, the upper end of the absorption tower i 1 is further provided with an ultrapure water inlet 4, the ultrapure water inlet 4 is used for delivering ultrapure water for absorbing purified hydrogen chloride gas into the absorption tower i 1, the lower end of the absorption tower ii 7 is provided with a hydrogen chloride inlet 13, the hydrogen chloride inlet 13 is used for delivering raw material purified hydrogen chloride gas into the absorption tower ii 7, and the specific height of the hydrogen chloride inlet 13 can be designed according to practical situations, but the hydrogen chloride inlet 13 needs to be positioned below a packing support plate 11 in the absorption tower ii 7 so as to ensure that purified hydrogen chloride gas entering the absorption tower ii 7 can be fully absorbed by the ultrapure water or hydrochloric acid when passing through a packing assembly 12; meanwhile, the circulating hydrochloric acid inlet 6 is positioned in the middle of the absorption tower I1, so that the hydrochloric acid can be newly fed into the absorption tower I1 to absorb unreacted purified hydrogen chloride gas after entering the heat exchanger I17 through the hydrochloric acid extraction outlet 9 for heat exchange, the stroke of absorbing the purified hydrogen chloride gas is only smaller than that of the ultrapure water, and the absorption efficiency of the purified hydrogen chloride gas is ensured.

The absorption tower I1 and the absorption tower II 7 are respectively internally provided with a first liquid distributor 5, the first liquid distributors 5 in the absorption tower I1 are respectively positioned below the ultrapure water inlet 4 and below the circulating hydrochloric acid inlet 6, namely, two first liquid distributors 5 in the absorption tower I1 are used for distributing ultrapure water fed into the absorption tower I1, the other first liquid distributor 5 in the absorption tower I1 is used for distributing liquid which is newly fed into the absorption tower I1, the first liquid distributors 5 in the absorption tower II 7 are positioned below the acid extraction inlet 10, namely, one first liquid distributor 5 in the absorption tower II 7 is used for distributing hydrochloric acid fed into the absorption tower II 7 through the acid extraction inlet 10, and the first liquid distributors 5 in the absorption tower II 7 are mainly used for distributing liquid. Through the cooperation of a plurality of first liquid distributors 5, the ultrapure water, the hydrochloric acid newly fed into the absorption tower I1 and the hydrochloric acid newly fed into the absorption tower II 7 can absorb the hydrogen chloride gas as much as possible, so that the absorption efficiency is higher.

As a further improvement of the present embodiment, as shown in fig. 3, the first liquid distributor 5 includes a first partition plate 51 and a plurality of first gas risers 52 penetrating the first partition plate 51, wherein the upper ends of the plurality of first gas risers 52 are higher than the upper surface of the first partition plate 51, so that ultrapure water or hydrochloric acid flows onto the first partition plate 51 and then flows downwards along the inner wall of the first gas risers 52, and at this time, the ultrapure water or hydrochloric acid flowing along the inner wall of the first gas risers 52 can fully contact and react with the hydrogen chloride gas flowing upwards through the first gas risers 52, thereby fully absorbing the hydrogen chloride gas and improving the absorption efficiency of the hydrogen chloride gas. In order to make the installation of the first partition plate 51 more convenient, the first partition plate 51 can be installed at the joint of two tower sections, namely, the edge of the first partition plate 51 is pressed and fixed between the flanges of the two tower sections, so that the two tower sections are fixedly connected and simultaneously the installation of the first partition plate 51 is realized, and the installation of the first liquid distributor 5 is simpler and more convenient.

As a further improvement of the embodiment, the diameter of the first riser pipe 52 is 15-20 mm, the length of the first riser pipe 52 is 120-150 mm, and the specific inner diameter and length of the first riser pipe 52 can be adjusted according to practical situations; meanwhile, the upper edge of the first riser 52 is also provided with a plurality of V-shaped grooves 53, and the V-shaped grooves 53 are uniformly distributed at intervals along the circumferential direction of the first riser 52, so that ultrapure water or hydrochloric acid enters the first riser 52 in an overflow mode, ultrapure water or hydrochloric acid can uniformly flow downwards along the inner wall of the first riser 52, the liquid distribution effect is better, and the absorption efficiency of the ultrapure water or hydrochloric acid on hydrogen chloride gas is improved.

As a further improvement of the embodiment, the ultrapure water inlet 4, the circulating hydrochloric acid inlet 6 and the acid extraction inlet 10 are respectively provided with an insertion pipe 21, as shown in fig. 5, the insertion pipes 21 are provided with flange plates so that the ultrapure water inlet 4, the circulating hydrochloric acid inlet 6 and the acid extraction inlet 10 are connected with a pipeline; meanwhile, the opening 211 with the opening 211 facing downwards is arranged on the insertion tube 21, the opening 211 is positioned at the lowest position of the insertion tube 21, and the opening 211 is rectangular, so that disturbance generated when ultrapure water enters the absorption tower I1 or hydrochloric acid enters the absorption tower II 7 is smaller, and the influence on the absorption of hydrogen chloride gas is avoided. It should be noted that the specific structure of the opening 211 on the insertion tube 21 may be adjusted according to the actual situation.

As a further improvement of this embodiment, be provided with packing backup pad 11 in absorption tower I1, the absorption tower II 7, packing backup pad 11 is convenient for pack assembly 12's installation, and pack and have a plurality of round holes on the backup pad 11, the round hole is the through-hole, the diameter of round hole is less than 20mm, a plurality of round holes equipartitions are on packing backup pad 11, not only be convenient for hydrogen chloride gas is the upward flow of permeating packing backup pad 11, and ultrapure water or hydrochloric acid can permeate packing backup pad 11 downwardly flow of being convenient for, here, in order to be convenient for pack backup pad 11's installation, packing backup pad 11 mountable is in the junction of two tower sections, the edge press fastening of packing backup pad 11 is fixed between the ring flange of two tower sections, make two tower sections realize packing backup pad 11's installation promptly in fixed connection, make packing backup pad 11's installation simpler, convenience.

The packing support plate 11 is located below the first liquid distributor 5, and the packing assembly 12 is further installed on the packing support plate 11, so that liquid distributed through the first liquid distribution pipe can directly enter the packing assembly 12, hydrogen chloride gas can fully contact with ultrapure water and hydrochloric acid, and the absorption effect of the hydrogen chloride gas is further improved.

As a further improvement of this embodiment, the packing assembly 12 is a pall ring packing, which can further increase the contact area between the hydrogen chloride gas and the ultrapure water or hydrochloric acid energy, so that the absorption effect of the hydrogen chloride gas is better.

As a further improvement of the embodiment, the absorption towers I1 and II 7 are of split type structures, at this time, the absorption towers I1 and II 7 are independently arranged, and the hydrochloric acid extraction port 9 is positioned at the bottom of the absorption tower I1, so that hydrochloric acid formed after the ultrapure water in the absorption tower I1 absorbs hydrogen chloride gas can be more thoroughly discharged from the absorption tower I1, and the generated hydrochloric acid is prevented from being deposited at the bottom of the absorption tower I1; simultaneously, absorption tower I1, absorption tower II 7 upper end all is equipped with silk screen demister 3, this silk screen demister 3 mainly used makes hydrogen chloride gas can get rid of the entrainment when passing to realize the effect of gas-liquid separation, and absorption tower I1, absorption tower II 7 top all is equipped with tail gas export 2, tail gas export 2 on the absorption tower II 7 is connected with absorption tower I1 lower extreme, make the hydrogen chloride gas that does not fully absorb in the absorption tower II 7 can enter into in the absorption tower I1 and continue to absorb, thereby make the hydrogen chloride gas can fully be absorbed, make the absorption efficiency of hydrogen chloride gas higher.

As a further improvement of this embodiment, the lower end of the absorption tower i 1 is further provided with an air inlet 8, the tail gas outlet 2 on the absorption tower ii 7 is connected with the air inlet 8, and when the position of the air inlet 8 is designed, the height of the air inlet 8 can be designed according to practical situations, but the height of the air inlet 8 needs to be lower than the lowest filler support plate 11 in the absorption tower i 1, so as to ensure that purified hydrogen chloride gas entering the absorption tower i 1 can be fully absorbed by ultrapure water or hydrochloric acid when passing through the filler assembly 12. The lower ends of the absorption tower I1 and the absorption tower II 7 are also provided with a gas-liquid balance port 14.

As a further improvement of the embodiment, the absorption tower i 1, the absorption tower ii 7, the heat exchanger i 17, the heat exchanger ii 18, the circulation tank 19 and the circulation pump 20 are made of steel lining N-PTFE, and the absorption tower i 1, the absorption tower ii 7, the heat exchanger i 17, the heat exchanger ii 18, the circulation tank 19 and the circulation pump 20 are connected through steel lining N-PTFE pipes; meanwhile, the wire mesh demister 3, the insertion pipe 21, the pall ring and the heat exchange pipe are made of high-purity PFA, and the filler supporting plate 11 and the first liquid distributor 5 are made of N-PTFE.

The working process of the electronic hydrochloric acid absorption system provided by the embodiment is as follows:

raw material purified hydrogen chloride gas enters the lower end of the absorption tower II 7 from a hydrogen chloride inlet 13 at the lower end of the absorption tower II 7, and ultrapure water enters the upper end of the absorption tower I1 through an ultrapure water inlet 4 on the absorption tower I1; the ultrapure water entering the upper end of the absorption tower I1 flows downwards after being uniformly distributed through the first riser 52 on the first liquid distributor 5 in the absorption tower I1, flows downwards and is subjected to liquid distribution again through the filler component 12, and enters the heat exchanger I17 through the hydrochloric acid extraction port 9 to exchange heat when entering the bottom of the absorption tower I1, enters the upper end of the absorption tower II 7 through the acid extraction port 10 after exchanging heat, and flows downwards after being uniformly distributed through the first riser 52 on the first liquid distributor 5 in the absorption tower II 7; the raw material purified hydrogen chloride gas entering the lower end of the absorption tower II 7 continuously flows upwards through the holes on the filler supporting plate 11, the filler component 12 and the first riser 52 on the first liquid distributor 5 in the absorption tower II 7, when entering the upper end of the absorption tower II 7, the hydrogen chloride gas enters the lower end of the absorption tower I1 after being separated from gas and liquid through the wire mesh foam remover 3 at the upper end of the absorption tower II 7, and the hydrogen chloride gas entering the lower end of the absorption tower I1 continuously flows upwards through the holes on the filler supporting plate 11, the filler component 12 and the first riser 52 on the first liquid distributor 5 in the absorption tower I1; in the process of flowing up hydrogen chloride gas and flowing down ultrapure water, the ultrapure water absorbs the hydrogen chloride gas, thereby obtaining electronic hydrochloric acid.

When the generated electronic hydrochloric acid flows downwards to the bottom of the absorption tower II 7, the electronic hydrochloric acid enters the heat exchanger II 18 through the hydrochloric acid outlet 16 and then enters the circulation tank 19 after heat exchange, part of hydrochloric acid in the circulation tank 19 is sent to the finished product tank through the circulation pump 20, and the other part of hydrochloric acid enters the absorption tower I1 through the circulation acid inlet 6 to absorb hydrogen chloride gas in a circulating way, and finally, tail gas generated after absorption enters the upper end of the absorption tower I1 and is sent to a tail gas device from the tail gas outlet 2 on the absorption tower I1 after gas-liquid separation through the wire mesh demister 3.

The use of the electronic hydrochloric acid absorption system provided in this example is illustrated below with purified hydrogen chloride and ultrapure water as raw materials:

1. opening a cooling water inlet valve and a cooling water outlet valve, and connecting the heat exchanger I17 and the heat exchanger II 18 with a cooling water system;

2. opening inlet and outlet valves of all equipment, and communicating an absorption tower I1, an absorption tower II 7, a heat exchanger I17, a heat exchanger II 18, a circulating tank 19 and a circulating pump 20;

3. opening a tail gas discharge valve at a tail gas outlet 2 on the absorption tower I1 to communicate the absorption tower I1 with a tail gas device;

4. opening a feed valve at an ultrapure water inlet 4 on the absorption tower I1, and adding ultrapure water into the absorption tower I1 through the ultrapure water inlet 4;

5. after a period of time, starting a circulating pump 20 to enable the ultrapure water in the circulating tank 19 to enter the absorption tower I1 through the circulating acid inlet 6;

6. opening a feed valve at a hydrogen chloride inlet 13 on the absorption tower II 7, and adding purified hydrogen chloride gas into the absorption tower II 7 through the hydrogen chloride inlet 13;

7. when the liquid level in the circulation tank 19 reaches a set value, detecting the concentration of hydrochloric acid in the circulation tank 19; before the concentration of hydrochloric acid is less than 36%, part of hydrochloric acid is sent to an industrial hydrochloric acid storage tank through a circulating pump 20 (the volume of the sent hydrochloric acid is consistent with the volume of the added ultrapure water), and the circulating pump 20 sends the other part of hydrochloric acid into an absorption tower I1 through a circulating acid inlet 6 to circularly absorb the hydrogen chloride gas; after the hydrochloric acid concentration reached 36%, part of the hydrochloric acid was directly sent to the final tank (the volume of the sent hydrochloric acid was identical to the volume of the ultrapure water added) by the circulation pump 20. It should be noted that when the system is just started, the concentration of the prepared hydrochloric acid cannot be qualified instantaneously, so that the concentration of the hydrochloric acid is required to be detected at the moment, namely the hydrochloric acid produced through the step is required to be sent to a finished product tank after being sent into an industrial hydrochloric acid storage tank, and the concentration of the hydrochloric acid is required to be detected to be stable; meanwhile, after the system is stable, namely the concentration of the prepared hydrochloric acid is stabilized at 36%, concentration detection is not needed at the moment, part of hydrochloric acid is sent to a finished product tank by the circulating pump 20, the other part of hydrochloric acid is sent to the absorption tower I1, and the hydrochloric acid sent to the absorption tower I1 can be used for wetting a filler component, so that the gas-liquid contact surface is increased, and the absorption efficiency is improved.

8. When the concentration of hydrochloric acid in the circulating tank is kept at 36%, the system is stably operated, part of hydrochloric acid is sent to the finished product tank (the volume of the sent hydrochloric acid is consistent with the volume of the added ultrapure water) through the circulating pump 20, and the other part of hydrochloric acid is sent to the absorption tower I1 through the circulating acid inlet 6 for circulating absorption of the hydrogen chloride gas through the circulating pump 20.

Example 2

As shown in fig. 2, the electronic hydrochloric acid absorption system provided in this embodiment is different from the electronic hydrochloric acid absorption system in embodiment 1 in that:

the absorption tower i 1 and the absorption tower ii 7 in the embodiment are of integral structures, that is, the lower end of the absorption tower i 1 and the upper end of the absorption tower ii 7 are not provided with sealing heads, the lower end of the absorption tower i 1 and the upper end of the absorption tower ii 7 are directly and fixedly connected through bolts, the connected absorption tower i 1 and the absorption tower ii 7 are directly communicated, at the moment, the absorption tower i 1 and the absorption tower ii 7 are not connected by adopting a pipeline system any more, that is, only the top of the absorption tower i 1 is provided with a tail gas outlet 2, and the top of the absorption tower ii 7 is not provided with a tail gas outlet 2 any more; similarly, only the upper end of the absorption tower I1 is required to be provided with the silk screen foam remover 3, the upper end of the absorption tower II 7 is not required to be provided with the silk screen foam remover 3, and the upper end of the absorption tower II 7 is also required to be provided with the silk screen foam remover 3.

Compared with the electronic hydrochloric acid absorption system provided in the embodiment 1, the electronic hydrochloric acid absorption system provided in the embodiment is simpler in structure, and only occupies a high space during installation, so that the space occupied by ground installation is smaller.

As a further improvement of the embodiment, the joint of the absorption tower i 1 and the absorption tower ii 7 is further provided with a second liquid distributor 15, and the second liquid distributor 15 is mainly used for distributing ultrapure water or hydrochloric acid flowing to the bottom of the absorption tower i 1, so as to reduce the impact force of the ultrapure water or hydrochloric acid when flowing downwards and reduce the disturbance of the ultrapure water or hydrochloric acid; meanwhile, the second liquid distributor 15 is located between the hydrochloric acid extraction port 9 and the extracted acid inlet 10, so that the hydrochloric acid can exchange heat through the heat exchanger I17 when entering the absorption tower II 7 from the absorption tower I1, the temperature of ultrapure water or hydrochloric acid entering the absorption tower II 7 is lower, unabsorbed hydrogen chloride gas is continuously absorbed, and the absorption effect of the hydrogen chloride gas is improved.

As a further improvement of the present embodiment, as shown in fig. 4, the second liquid distributor 15 includes a second partition 151 and a second riser 152 penetrating the partition, the second riser 152 may be one or more, and the second riser 152 is mainly used to make the hydrogen chloride gas that is not completely absorbed in the absorption tower ii 7 flow upward into the absorption tower i 1; meanwhile, the top cover of the second riser 152 is provided with a cone top 153, the cone top 153 covers the upper end of the second riser 152, so that downward flowing ultrapure water or hydrochloric acid is prevented from vertically entering the second riser 152 to affect the upward flowing of the hydrogen chloride gas, but in order to ensure the upward flowing of the hydrogen chloride gas, the upper end of the second riser 152 is provided with a rectangular hole 154, and the rectangular hole 154 is positioned on the side wall of the second riser 152, so that the cone top 153 can not shield the rectangular hole 154, and the hydrogen chloride gas which is not fully absorbed in the absorption tower II 7 can flow upward through the second riser 152. In order to ensure that ultrapure water or hydrochloric acid can also enter the heat exchanger I17 through the hydrochloric acid outlet 9, the rectangular hole 154 is required to be higher than the hydrochloric acid outlet 9 when being opened; meanwhile, the plurality of rectangular holes 154 on the second riser 152 may be provided, and the plurality of rectangular holes 154 are arranged at intervals along the circumferential direction of the second riser 152, so that not only the upward flow of the hydrogen chloride gas can be ensured, but also the ultrapure water or hydrochloric acid deposited on the second partition 151 cannot flow downwards along the inner wall of the second riser 152 through the overflow port of the rectangular holes 154 even when the ultrapure water or hydrochloric acid is fed into the heat exchanger I17 through the hydrochloric acid extraction port 9, and at this time, the ultrapure water or hydrochloric acid flowing along the inner wall of the second riser 152 can fully contact and react with the hydrogen chloride gas flowing upwards through the second riser 152, thereby fully absorbing the hydrogen chloride gas and improving the absorption efficiency of the hydrogen chloride gas, and at this time, the ultrapure water or hydrochloric acid overflowed into the second riser 152 can cover the whole inner wall when flowing downwards along the wall through the cooperation of the plurality of rectangular holes 154.

In order to make the installation of the second partition plate 151 more convenient, the second partition plate 151 can be installed at the joint of two tower sections, namely, the edge of the second partition plate 151 is pressed and fixed between the flanges of the two tower sections, so that the two tower sections are fixedly connected and simultaneously the installation of the second partition plate 151 is realized, and the installation of the second liquid distributor 15 is simpler and more convenient.

As a further improvement of the present embodiment, the diameter of the second riser 152 is 15-20 mm, the length of the second riser 152 is 400-500 mm, and the specific inner diameter and length of the second riser 152 can be adjusted according to practical situations; meanwhile, the distance between the rectangular hole 154 and the hydrochloric acid extraction port 9 is larger than 200mm, so that ultrapure water or hydrochloric acid can enter the heat exchanger I17 through the hydrochloric acid extraction port 9 for heat exchange.

raw material purified hydrogen chloride gas enters the lower end of the absorption tower II 7 from a hydrogen chloride inlet 13 at the lower end of the absorption tower II 7, and ultrapure water enters the upper end of the absorption tower I1 through an ultrapure water inlet 4 on the absorption tower I1; the ultrapure water entering the upper end of the absorption tower I1 flows downwards after being uniformly distributed by the first riser 52 on the first liquid distributor 5 in the absorption tower I1, flows downwards and is subjected to liquid distribution again by the filler component 12, when entering the bottom of the absorption tower I1, the ultrapure water is deposited on the second partition 151, enters the heat exchanger I17 through the hydrochloric acid extraction port 9 for heat exchange, enters the upper end of the absorption tower II 7 through the acid extraction port 10 after heat exchange, and flows downwards after being uniformly distributed by the first riser 52 on the first liquid distributor 5 in the absorption tower II 7; the purified hydrogen chloride gas of raw materials entering the lower end of the absorption tower II 7 continuously flows upwards through the holes on the filler supporting plate 11, the filler component 12 and the first riser 52 on the first liquid distributor 5 in the absorption tower II 7, and when entering the upper end of the absorption tower II 7, the hydrogen chloride gas upwards flows into the lower end of the absorption tower I1 through the second riser 152, and the hydrogen chloride gas entering the lower end of the absorption tower I1 continuously flows upwards through the holes on the filler supporting plate 11, the filler component 12 and the first riser 52 on the first liquid distributor 5 in the absorption tower I1, and when entering the upper end of the absorption tower I1; in the process of flowing up hydrogen chloride gas and flowing down ultrapure water, the ultrapure water absorbs the hydrogen chloride gas, thereby obtaining electronic hydrochloric acid.

7. when the liquid level in the circulation tank 19 reaches a set value, detecting the concentration of hydrochloric acid in the circulation tank 19; before the concentration of hydrochloric acid is less than 36%, part of hydrochloric acid is sent to an industrial hydrochloric acid storage tank through a circulating pump 20 (the volume of the sent hydrochloric acid is consistent with the volume of the added ultrapure water), and the circulating pump 20 sends the other part of hydrochloric acid into an absorption tower I1 through a circulating acid inlet 6 to circularly absorb the hydrogen chloride gas; after the hydrochloric acid concentration reached 36%, part of the hydrochloric acid was directly sent to the final tank (the volume of the sent hydrochloric acid was identical to the volume of the ultrapure water added) by the circulation pump 20. It should be noted that when the system is just started, the concentration of the prepared hydrochloric acid cannot be qualified instantaneously, so that the concentration of the hydrochloric acid is required to be detected at the moment, namely the hydrochloric acid produced through the step is required to be sent to a finished product tank after being sent into an industrial hydrochloric acid storage tank, and the concentration of the hydrochloric acid is required to be detected to be stable; meanwhile, when the system is stable, namely the concentration of the prepared hydrochloric acid is stabilized at 36%, concentration detection is not needed at the moment, a part of hydrochloric acid is sent to a finished product tank by the Xu Xun pump 20, the other part of hydrochloric acid is sent to the absorption tower I1, and the hydrochloric acid sent to the absorption tower I1 can be used for wetting a filler component, so that the gas-liquid contact surface is increased, and the absorption efficiency is improved.

In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the utility model. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present utility model.

Claims

1. The utility model provides an electron hydrochloric acid absorption system, a serial communication port, including absorption tower I (1), absorption tower II (7), heat exchanger I (17), heat exchanger II (18), circulation groove (19) and circulating pump (20), absorption tower I (1), absorption tower II (7), heat exchanger I (17) and circulating pump (20) connect gradually, have circulation hydrochloric acid import (6) and hydrochloric acid extraction mouth (9) on absorption tower I (1), have on absorption tower II (7) and extract acid import (10), and the exit end and the circulation hydrochloric acid import (6) of circulating pump (20) are connected, heat exchanger I (17) are connected between hydrochloric acid extraction mouth (9) and extraction acid import (10).

2. The electronic hydrochloric acid absorption system according to claim 1, wherein the upper end of the absorption tower I (1) is further provided with an ultrapure water inlet (4), the lower end of the absorption tower II (7) is provided with a hydrogen chloride inlet (13), the circulating hydrochloric acid inlet (6) is positioned in the middle of the absorption tower I (1), the absorption tower I (1) and the absorption tower II (7) are respectively provided with a first liquid distributor (5), the first liquid distributors (5) in the absorption tower I (1) are respectively positioned below the ultrapure water inlet (4) and below the circulating hydrochloric acid inlet (6), and the first liquid distributors (5) in the absorption tower II (7) are positioned below the acid extraction inlet (10).

3. The electronic hydrochloric acid absorption system according to claim 2, wherein the first liquid distributor (5) comprises a first partition plate (51) and a plurality of first riser pipes (52) penetrating the first partition plate (51), and upper ends of the plurality of first riser pipes (52) are higher than an upper surface of the first partition plate (51).

4. An electronic hydrochloric acid absorption system according to claim 3, wherein the inner diameter of the first riser (52) is 15-20 mm, the length of the first riser (52) is 120-150 mm, and a plurality of V-shaped grooves (53) are formed in the upper edge of the first riser (52).

5. The electronic hydrochloric acid absorption system according to claim 2, wherein the ultrapure water inlet (4), the circulating hydrochloric acid inlet (6) and the acid extraction inlet (10) are respectively provided with an insertion pipe (21), and the insertion pipe (21) is provided with an opening (211) facing downwards.

6. The electronic hydrochloric acid absorption system according to claim 2, wherein a packing support plate (11) is arranged in the absorption tower I (1) and the absorption tower II (7), a plurality of round holes are formed in the packing support plate (11), the packing support plate (11) is located below the first liquid distributor (5), and a packing assembly (12) is further arranged on the packing support plate (11).

7. The electronic hydrochloric acid absorption system according to claim 6, characterized in that the packing assembly (12) is a pall ring packing.

8. The electronic hydrochloric acid absorption system according to any one of claims 1 to 7, wherein the absorption tower i (1) and the absorption tower ii (7) are of split type structures, the hydrochloric acid extraction opening (9) is located at the bottom of the absorption tower i (1), silk screen foam removers (3) are respectively arranged at the upper ends of the absorption tower i (1) and the absorption tower ii (7), tail gas outlets (2) are respectively arranged at the tops of the absorption tower i (1) and the absorption tower ii (7), and the tail gas outlets (2) on the absorption tower i (1) are connected with the lower ends of the absorption tower ii (7).

9. The electronic hydrochloric acid absorption system according to claim 8, wherein an air inlet (8) is further arranged at the lower end of the absorption tower I (1), and the tail gas outlet (2) on the absorption tower II (7) is connected with the air inlet (8).

10. The electronic hydrochloric acid absorption system according to any one of claims 1 to 7, wherein the absorption tower i (1) and the absorption tower ii (7) are of an integral structure, a wire mesh demister (3) is arranged at the upper end of the absorption tower i (1), and a tail gas outlet (2) is arranged at the top of the absorption tower i (1).

11. The electronic hydrochloric acid absorption system according to claim 10, wherein a second liquid distributor (15) is further installed at the joint of the absorption tower I (1) and the absorption tower II (7), and the second liquid distributor (15) is located between the hydrochloric acid extraction outlet (9) and the acid extraction inlet (10).

12. The electronic hydrochloric acid absorption system according to claim 11, wherein the second liquid distributor (15) comprises a second partition plate (151) and a second riser (152) penetrating through the partition plate, a conical top (153) is arranged on a top cover of the second riser (152), and rectangular holes (154) are formed in the second riser (152), and the rectangular holes (154) are higher than the hydrochloric acid extraction holes (9).

13. The electronic hydrochloric acid absorption system according to claim 12, wherein the second riser (152) has an inner diameter of 15-20 mm, the second riser (152) has a length of 400-500 mm, and the distance between the rectangular hole (154) and the hydrochloric acid extraction port (9) is greater than 200mm.