Hydrochloric acid recovery system

Abstract

The utility model belongs to the technical field of separation device, concretely relates to a hydrochloric acid recovery system, including adsorption tower, adsorption tower is connected with heating kettle, heating kettle is connected with first absorption tower, first absorption tower is connected with first storage jar, first storage jar is connected with second absorption tower, second absorption tower is connected with second storage jar, first absorption tower inside is provided with absorption liquid pipeline no.

Description

Technical Field

[0001] This utility model belongs to the field of separation device technology, and specifically relates to a hydrochloric acid recovery system. Background Technology

[0002] Hydrochloric acid recovery is a chemical process that treats waste acid through a gentle procedure. It is mainly used to convert waste hydrochloric acid with high impurity content and low concentration into industrial-grade concentrated hydrochloric acid, solving the problems of high pollution and high treatment costs caused by waste acid in the production field.

[0003] The core technology includes a hydrogen chloride recovery unit and waste hydrochloric acid purification technology, encompassing various types of recovery units and purification methods. Basic operations include preheating of waste acid, catalyst mixing, hydrogen chloride desorption, and condensation / demisting, forming a closed-loop system to achieve resource utilization and reduce processing costs. During phosphorous acid production, especially in the phosphorus trichloride hydrolysis process, a large amount of hydrochloric acid gas is released from the reaction system. Therefore, it is necessary to select a recovery unit capable of recycling, environmentally friendly treatment, and industrial applications of hydrochloric acid.

[0004] However, the current hydrochloric acid recovery and treatment methods have high processing costs, complex processing equipment structures, and cannot be used on a large industrial scale, resulting in low processing efficiency. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a hydrochloric acid recovery system that can recover hydrochloric acid from waste liquid, effectively treat wastewater, reduce pollution, and reuse the recovered hydrochloric acid in industrial production, thereby realizing the recycling of hydrochloric acid.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] The hydrochloric acid recovery system of this utility model includes an adsorption tower, a heating vessel connected to the adsorption tower, a first absorption tower connected to the heating vessel, a first storage tank connected to the first absorption tower, a second absorption tower connected to the first storage tank, and a second storage tank connected to the second absorption tower. An absorbent pipe is installed inside the first absorption tower, and several guide plates are spaced apart on the outside of the absorbent pipe. An absorbent pipe is installed inside the second absorption tower, and several guide plates are spaced apart on the outside of the absorbent pipe. The top of the first absorption tower is connected to the bottom of the second absorption tower.

[0008] in:

[0009] An air inlet pipe is provided at the top of the adsorption tower.

[0010] The heating vessel is provided with a raw liquid inlet at the top, which is connected to the bottom of the adsorption tower. A heating jacket is provided on the outside of the heating vessel, and a transfer pump is provided between the heating vessel and the first absorption tower.

[0011] The first absorption tower is equipped with a liquid inlet pipe at its upper part, and a sprayer is installed on the upper inner side of the first absorption tower. The second absorption tower is equipped with a sprayer on the upper inner side.

[0012] The bottom of the first storage tank is equipped with a transfer pump, which is connected to a sprayer and an absorbent pipe.

[0013] The bottom of the second storage tank is equipped with a concentration monitor and a second transfer pump. The second transfer pump is connected to the second sprayer and is also connected to a hydrochloric acid pipeline.

[0014] Both the first and second absorbent pipes are provided with several through holes.

[0015] Both the first and second diversion plates are provided with several through holes, and both the first and second diversion plates are inclined.

[0016] Both the first and second absorption towers are equipped with jackets on their outer sides.

[0017] The top of the second absorption tower is connected to a gas buffer tank.

[0018] The beneficial effects of this utility model are:

[0019] This invention purifies hydrochloric acid waste liquid by performing preliminary treatment, hydrogen chloride separation, and hydrogen chloride absorption to obtain a hydrochloric acid solution suitable for industrial production. In this invention, the adsorption tower and heating vessel separate pure hydrogen chloride gas from the waste liquid, which then enters the first and second absorption towers for absorption. The arrangement of the absorbent pipe and guide plate further promotes the mixing of the absorbent liquid and hydrogen chloride gas, increasing their contact area and improving absorption efficiency. This invention does not require the addition of extra additives when recovering hydrochloric acid and does not generate new chemical waste. Utilizing the volatile nature of hydrogen chloride gas for recovery, the treatment method is more environmentally friendly, facilitates subsequent production, improves economic efficiency, and reduces processing costs. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the absorbent pipe structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the diversion plate of this utility model;

[0023] In the diagram: 1. Adsorption tower; 2. Heating vessel; 3. First absorption tower; 4. First storage tank; 5. Second absorption tower; 6. Second storage tank; 7. Buffer tank; 101. Inlet pipe; 201. Transfer pump; 202. Raw material inlet; 301. Liquid inlet pipe; 302. Absorbent liquid pipe one; 303. Drain plate one; 304. Sprayer one; 401. Transfer pump one; 501. Absorbent liquid pipe two; 502. Drain plate two; 503. Sprayer two; 601. Concentration monitor; 602. Transfer pump two; 603. Hydrochloric acid pipe. Detailed Implementation

[0024] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1-3 As shown, the hydrochloric acid recovery system of this utility model includes an adsorption tower 1, a heating vessel 2 connected to the adsorption tower 1, a first absorption tower 3 connected to the heating vessel 2, a first storage tank 4 connected to the first absorption tower 3, a second absorption tower 5 connected to the first storage tank 4, and a second storage tank 6 connected to the second absorption tower 5. An absorbent pipe 302 is installed inside the first absorption tower 3, and several guide plates 303 are spaced apart on the outside of the absorbent pipe 302. An absorbent pipe 501 is installed inside the second absorption tower 5, and several guide plates 502 are spaced apart on the outside of the absorbent pipe 501. The top of the first absorption tower 3 is connected to the bottom of the second absorption tower 5.

[0027] The absorbent pipe 2 501 has the same structure as the absorbent pipe 1 302, and the diversion plate 2 502 has the same structure as the diversion plate 1 303.

[0028] An air inlet pipe 101 is provided at the top of the adsorption tower 1.

[0029] The heating vessel 2 is equipped with a raw liquid inlet 202 at the top, which is connected to the bottom of the adsorption tower 1. A heating jacket is installed on the outside of the heating vessel 2, and a transfer pump 201 is installed between the heating vessel 2 and the first absorption tower 3. Hot water enters from the top of the heating jacket and exits from the bottom of the heating jacket.

[0030] The first absorption tower 3 is equipped with an inlet pipe 301 at its upper part, and a sprayer 304 is installed on the upper inner side of the first absorption tower 3. The second absorption tower 5 is equipped with a sprayer 503 on the upper inner side of its inner side. When the hydrochloric acid in the first storage tank 4 is recirculated back into the first absorption tower 3, it is sprayed evenly by the sprayer 304. When the hydrochloric acid in the second storage tank 6 is recirculated back into the second absorption tower 5, it is sprayed evenly by the sprayer 503.

[0031] The bottom of the first storage tank 4 is equipped with a transfer pump 401, which is connected to a sprayer 304 and an absorption liquid pipeline 501.

[0032] The bottom of the second storage tank 6 is equipped with a concentration monitor 601 and a second transfer pump 602. The second transfer pump 602 is connected to the second sprayer 503 and is also connected to the hydrochloric acid pipeline 603.

[0033] Both the absorbent pipe 302 and the absorbent pipe 501 have several through holes.

[0034] Both the first diversion plate 303 and the second diversion plate 502 are provided with several through holes, and both the first diversion plate 303 and the second diversion plate 502 are inclined.

[0035] Both the first absorption tower 3 and the second absorption tower 5 are equipped with jackets on their outer sides. Cooling water enters from the bottom of the jacket and exits from the top of the jacket.

[0036] The top of the second absorption tower 5 is connected to a gas buffer tank 7.

[0037] Working principle and process:

[0038] When treating hydrochloric acid waste liquid, it is first transported to adsorption tower 1 for preliminary treatment to obtain raw treatment solution. The raw treatment solution is then transported to heating vessel 2 through raw solution inlet 202 for heating. Hot water is added to the upper part of the heating jacket to heat the raw solution, causing the hydrogen chloride gas in the raw solution to continuously evaporate and be added from the top of heating vessel 2 to the bottom of first absorption tower 3. The absorbent liquid absorbing hydrogen chloride gas is added to absorbent liquid pipe 302 through inlet pipe 301. The absorbent liquid is dispersed through several through holes on absorbent liquid pipe 302. The hydrogen chloride gas entering from the bottom of first absorption tower 3 is dispersed upward by guide plate 303, and the absorbent liquid is also broken into smaller particles by guide plate 303. Tiny droplets of hydrogen chloride gas continuously contact the absorbent liquid and are absorbed to obtain hydrochloric acid. A small portion of the unabsorbed hydrogen chloride gas enters the bottom of the second absorption tower 5. The hydrochloric acid enters the first storage tank 4 from the bottom of the first absorption tower 3. The hydrochloric acid in the first storage tank 4 is then transported back to the first absorption tower 3 for circulation. Subsequently, the hydrochloric acid is transported to the absorbent liquid pipeline 501 in the second absorption tower 5 for a second absorption of hydrogen chloride gas. The hydrochloric acid in the second absorption tower 5 is then transported to the second storage tank 6 and subsequently circulated back to the second absorption tower 5. During this process, the concentration of hydrochloric acid continuously increases. After the concentration is detected by the concentration monitor 601, the hydrochloric acid is transported to the hydrochloric acid pipeline 603 by the transfer pump 602 for reuse.

Claims

1. A hydrochloric acid recovery system, comprising an adsorption tower (1), characterized in that, The adsorption tower (1) is connected to the heating vessel (2), the heating vessel (2) is connected to the first absorption tower (3), the first absorption tower (3) is connected to the first storage tank (4), the first storage tank (4) is connected to the second absorption tower (5), the second absorption tower (5) is connected to the second storage tank (6), the first absorption tower (3) is provided with an absorption liquid pipe I (302) inside, and a number of diversion plates I (303) are provided at intervals on the outside of the absorption liquid pipe I (302), the second absorption tower (5) is provided with an absorption liquid pipe II (501) inside, and a number of diversion plates II (502) are provided at intervals on the outside of the absorption liquid pipe II (501), and the top of the first absorption tower (3) is connected to the bottom of the second absorption tower (5).

2. The hydrochloric acid recovery system according to claim 1, characterized in that, An air inlet pipe (101) is provided at the top of the adsorption tower (1).

3. The hydrochloric acid recovery system according to claim 1, characterized in that, The heating vessel (2) is provided with a raw liquid inlet (202) at the top, which is connected to the bottom of the adsorption tower (1). A heating jacket is provided on the outside of the heating vessel (2), and a transfer pump (201) is provided between the heating vessel (2) and the first absorption tower (3).

4. The hydrochloric acid recovery system according to claim 1, characterized in that, The first absorption tower (3) is equipped with an inlet pipe (301) at the top, and a sprayer (304) is installed on the upper inner side of the first absorption tower (3). The second absorption tower (5) is equipped with a sprayer (503) on the upper inner side.

5. The hydrochloric acid recovery system according to claim 4, characterized in that, The bottom of the first storage tank (4) is equipped with a transfer pump (401), which is connected to a sprayer (304) and an absorption liquid pipeline (501).

6. The hydrochloric acid recovery system according to claim 4, characterized in that, The bottom of the second storage tank (6) is equipped with a concentration monitor (601) and a second transfer pump (602). The second transfer pump (602) is connected to the second sprayer (503). The second transfer pump (602) is also connected to a hydrochloric acid pipeline (603).

7. The hydrochloric acid recovery system according to claim 1, characterized in that, Both the first absorbent pipe (302) and the second absorbent pipe (501) have several through holes.

8. The hydrochloric acid recovery system according to claim 1, characterized in that, Both the first (303) and the second (502) of the diversion plate are provided with several through holes, and both the first (303) and the second (502) of the diversion plate are inclined.

9. The hydrochloric acid recovery system according to claim 1, characterized in that, Both the first absorption tower (3) and the second absorption tower (5) are equipped with jackets on their outer sides.

10. The hydrochloric acid recovery system according to claim 1, characterized in that, The top of the second absorption tower (5) is connected to a gas buffer tank (7).

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