Device for preparing hydrochloric acid by absorbing hydrogen chloride

Abstract

The utility model relates to a device for preparing hydrochloric acid by absorbing hydrogen chloride. The device comprises a primary falling film absorber (1), a secondary falling film absorber (2), a water inlet pipeline (3), a hydrochloric acid pipeline (4), a liquid phase connecting pipe (5), a concentrated hydrochloric acid discharging pipe (6), a gas phase connecting pipe (7), a tail gas pipe (8) and a hydrogen chloride gas feeding pipe (9). The device disclosed by the utility model is simple in structure, simple and convenient to operate and control, high in safety and reliability, and capable of effectively absorbing hydrogen chloride to obtain high-concentration hydrochloric acid of which the content is more than 32% by weight.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment. More specifically, the utility model relates to a device for absorbing hydrogen chloride to prepare hydrochloric acid.

Background Art

[0002] Hydrochloric acid is an important chemical raw material and is widely used in industries such as dyes, pharmaceuticals, food, printing and dyeing, leather, and metallurgy. Hydrochloric acid can be used to manufacture chlorides such as zinc chloride, and can also be used to extract metals such as radium, vanadium, tungsten, and manganese from ores to form chlorides. Hydrochloric acid is one of the main products of chlor-alkali chemical industry. Currently, most hydrochloric acid synthesis processes consist of two major operating units: synthesis and absorption. The absorption of hydrogen chloride gas generally uses an adiabatic absorption tower and a film absorber, each having its own advantages and certain disadvantages. For example, the adiabatic absorption tower has a low absorption efficiency of hydrogen chloride and is prone to flooding and uneven flow phenomena.

[0003] In order to overcome the defects of the prior art and solve the problem of low absorption efficiency, the inventor of the present utility model has completed the present utility model through a large number of experiments and studies.

Content of the Utility Model

[0004] [Technical Problem to be Solved]

[0005] The purpose of the utility model is to provide a device for absorbing hydrogen chloride to prepare hydrochloric acid.

[0006] [Technical Solution]

[0007] The utility model is realized through the following technical solutions.

[0008] The utility model relates to a device for absorbing hydrogen chloride to prepare hydrochloric acid, which includes a first-stage falling film absorber 1 and a second-stage falling film absorber 2, and also includes a water inlet pipe 3, a hydrochloric acid pipe 4, a liquid-phase connecting pipe 5, a concentrated hydrochloric acid discharge pipe 6, a gas-phase connecting pipe 7, a tail gas discharge pipe 8, and a hydrogen chloride gas feed pipe 9;

[0009] A hydrogen chloride gas inlet 11 is arranged at the upper part of the first-stage falling film absorber 1, which is connected to the hydrogen chloride gas feed pipe 9. On the same side below it, a first circulating water return port 12 and a circulating water inlet port 13 are arranged in sequence from top to bottom; a first dilute hydrochloric acid inlet 14 is arranged on the side opposite to the hydrogen chloride gas inlet 11, and a hydrogen chloride gas outlet 15 is arranged below it on the same side; a concentrated hydrochloric acid discharge port 16 is arranged in the middle at the bottom of the first-stage falling film absorber 1, which is connected to the concentrated hydrochloric acid discharge pipe 6 provided with a first thermometer 61 thereon;

[0010] At the middle of the top of the secondary falling film absorber 2, a tail gas outlet 21 is provided, which is connected to the tail gas discharge pipe 8. At the middle of its bottom, a dilute hydrochloric acid outlet 27 is provided, which is connected to the first dilute hydrochloric acid inlet 14 of the primary falling film absorber 1 through a liquid phase connecting pipe 5 provided with a second thermometer 51 thereon; at the middle of one side of the secondary falling film absorber 2, a hydrogen chloride gas inlet 22 and a circulating water inlet 23 are arranged in sequence from top to bottom. The hydrogen chloride gas inlet 22 is connected to the hydrogen chloride gas outlet 15 of the primary falling film absorber 1 through a gas phase connecting pipe 7; on the other side of it, a water inlet 24, a second dilute hydrochloric acid inlet 25 and a second circulating water return port 26 are arranged in sequence from top to bottom; the water inlet 24 is connected to a water inlet pipe 3 provided with a water flowmeter 31 and a water regulating valve 32 thereon; the first dilute hydrochloric acid inlet 25 is connected to a hydrochloric acid pipe 4 provided with a hydrochloric acid flowmeter 41 and a hydrochloric acid regulating valve 42 thereon.

[0011] According to a preferred embodiment of the present invention, the primary falling film absorber 1 and the secondary falling film absorber 2 are cylindrical absorbers in which falling film pipes and cooling pipes are arranged in a manner parallel to the cylinder body of the falling film absorber inside.

[0012] According to another preferred embodiment of the present invention, the falling film pipe has a round block hole type or a shell and tube type structure; the cooling pipe is a pipe structure.

[0013] According to another preferred embodiment of the present invention, the ratio of the diameter to the height of the primary falling film absorber 1 and the secondary falling film absorber 2 is 1:5 - 8.

[0014] According to another preferred embodiment of the present invention, the ratio of the height between the hydrogen chloride gas inlet 11 and the top of the primary falling film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet 13 is 1:1.0 - 1.5:2.0 - 3.0.

[0015] According to another preferred embodiment of the present invention, the ratio of the height between the first dilute hydrochloric acid inlet 14 and the top of the primary falling film absorber 1 to the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:8 - 10.

[0016] According to another preferred embodiment of the present invention, the ratio of the height between the hydrogen chloride gas inlet 22 and the top of the secondary falling film absorber 2 to the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.5 - 0.8.

[0017] According to another preferred embodiment of the present utility model, the height ratio among the height between the water inlet 24 and the top of the secondary falling film absorber 2, the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1: 2.0 - 3.0: 0.3 - 0.6.

[0018] According to another preferred embodiment of the present utility model, the first thermometer 61 and the second thermometer 51 are thermocouple thermometers or resistance thermometers.

[0019] According to another preferred embodiment of the present utility model, the water flowmeter 31 and the hydrochloric acid flowmeter 41 are vortex flowmeters or rotameters; the water regulating valve 32 and the hydrochloric acid regulating valve 42 are pneumatic regulating valves or electric regulating valves.

[0020] The present utility model will be described in more detail below.

[0021] The present utility model relates to a device for absorbing hydrogen chloride to prepare hydrochloric acid. For the structural schematic diagram of the device, please refer to the appendix Figure 1 .

[0022] The device for absorbing hydrogen chloride to prepare hydrochloric acid includes a primary falling film absorber 1 and a secondary falling film absorber 2, and further includes a water inlet pipe 3, a hydrochloric acid pipe 4, a liquid phase connecting pipe 5, a concentrated hydrochloric acid discharge pipe 6, a gas phase connecting pipe 7, a tail gas discharge pipe 8, and a hydrogen chloride gas feed pipe 9;

[0023] According to the present utility model, the main function of the primary falling film absorber 1 in the device of the present utility model is to absorb hydrogen chloride gas;

[0024] The main function of the secondary falling film absorber 2 in the device of the present utility model is to absorb the hydrogen chloride gas that has not been completely absorbed by the primary falling film absorber;

[0025] The primary falling film absorber 1 and the secondary falling film absorber 2 used in the present utility model are cylindrical absorbers in which falling film pipes and cooling pipes are arranged in a manner parallel to the cylinder body of the falling film absorber. For the specific structure, please refer to the appendix Figure 2 .

[0026] In appendix Figure 2 A, a - falling film pipe with a round block hole structure; b - cooling pipe.

[0027] In appendix Figure 2 B, a - falling film pipe with a shell - and - tube structure; c - cooling pipe.

[0028] According to the present utility model, the ratio of the diameter to the height of the first falling film absorber 1 and the second falling film absorber 2 is 1:5 to 8. If the ratio of the diameter to the height of the first falling film absorber 1 and the second falling film absorber 2 is greater than 1:5, the residence time of hydrogen chloride in the absorption tower is short, resulting in poor absorption effect; if the ratio of the diameter to the height of the first falling film absorber 1 and the second falling film absorber 2 is less than 1:8, the flow rate of hydrogen chloride in the absorption tower is too large, which will also lead to poor absorption effect; therefore, it is reasonable that the ratio of the diameter to the height of the first falling film absorber 1 and the second falling film absorber 2 is 1:5 to 8;

[0029] The first falling film absorber 1 and the second falling film absorber 2 used in the present utility model are both products sold on the current market, such as the products sold by Nantong Black Shield Graphite Equipment Co., Ltd. under the trade names of GX type tubular graphite falling film absorber or YKX round block hole type graphite falling film absorber.

[0030] A hydrogen chloride gas inlet 11 is arranged at the upper part of the first falling film absorber 1, which is connected to a hydrogen chloride gas feed pipe 9. On the same side below it, a first circulating water return port 12 and a circulating water inlet 13 are arranged in sequence from top to bottom;

[0031] According to the present utility model, the ratio of the height between the hydrogen chloride gas inlet 11 and the top of the first falling film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet 13 is 1:1.0 to 1.5:2.0 to 3.0.

[0032] When the height between the hydrogen chloride gas inlet 11 and the top of the first falling film absorber 1 and the height between the first circulating water return port 12 and the circulating water inlet 13 are within the above ranges, if the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12 is lower than 1.0, the distance is too small, which is not conducive to the flange connection of the pipeline; if the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12 is higher than 1.5, the cooling effect is poor, which is not conducive to the absorption of hydrogen chloride; therefore, it is appropriate that the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12 is 1.0 to 1.5;

[0033] When the height between the hydrogen chloride gas inlet 11 and the top of the first falling film absorber 1 and the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12 are within the above ranges, if the height between the first circulating water return port 12 and the circulating water inlet 13 is lower than 2.0, the cooling area is too small, which is not conducive to absorption; if the height between the first circulating water return port 12 and the circulating water inlet 13 is higher than 3.0, increasing the cooling area has no obvious improvement on the absorption effect, but instead increases the equipment manufacturing and is uneconomical; therefore, it is reasonable that the height between the first circulating water return port 12 and the circulating water inlet 13 is 2.0 to 3.0;

[0034] A first dilute hydrochloric acid inlet 14 is arranged on the side opposite to the hydrogen chloride gas inlet 11, and a hydrogen chloride gas outlet 15 is arranged below it on the same side;

[0035] According to the present utility model, the ratio of the height between the first dilute hydrochloric acid inlet 14 and the top of the first falling film absorber 1 to the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:8 - 10. If this height ratio is greater than 1:8, the first falling film absorption effect will be affected, resulting in too low hydrochloric acid concentration; if this height ratio is less than 1:10, it will not increase the hydrochloric acid concentration much, but instead increase the equipment manufacturing cost, which is uneconomical; therefore, this height ratio of 1:8 - 10 is appropriate;

[0036] A concentrated hydrochloric acid discharge port 16 is arranged in the middle of the bottom of the first falling film absorber 1, and it is connected to a concentrated hydrochloric acid discharge pipe 6 provided with a first thermometer 61 thereon; the first thermometer 61 used in the present utility model is a thermocouple thermometer or a thermal resistance thermometer, and they are all products sold on the current market, such as products sold under the trade name armored thermocouple or armored thermal resistance by Wuxi Zhongce Sensor Technology Co., Ltd.

[0037] A tail gas outlet 21 is arranged in the middle of the top of the second falling film absorber 2, and it is connected to a tail gas discharge pipe 8. A dilute hydrochloric acid outlet 27 is arranged in the middle of the bottom of the second falling film absorber 2, and it is connected to the first dilute hydrochloric acid inlet 14 of the first falling film absorber 1 through a liquid phase connection pipe 5 provided with a second thermometer 51 thereon; the second thermometer 51 used in the present utility model is a thermocouple thermometer or a thermal resistance thermometer, and they are all products sold on the current market, such as products sold under the trade name armored thermocouple or armored thermal resistance by Wuxi Zhongce Sensor Technology Co., Ltd.

[0038] A hydrogen chloride gas inlet 22 and a circulating water inlet 23 are successively arranged from top to bottom in the middle of one side of the second falling film absorber 2, and the hydrogen chloride gas inlet 22 is connected to the hydrogen chloride gas outlet 15 of the first falling film absorber 1 through a gas phase connection pipe 7;

[0039] According to the present utility model, the ratio of the height between the hydrogen chloride gas inlet 22 and the top of the second falling film absorber 2 to the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.5 - 0.8. If this height ratio is greater than 1:0.5, the cooling area is insufficient, affecting the secondary absorption effect; if this height ratio is less than 1:0.8, increasing the cooling area will not significantly improve the secondary absorption effect, but instead increase the equipment manufacturing cost, which is uneconomical; therefore, this height ratio of 1:0.5 - 0.8 is appropriate;

[0040] On the other side of the secondary falling film absorber 2, a water inlet 24, a second dilute hydrochloric acid inlet 25, and a second circulating water return port 26 are sequentially arranged from top to bottom; the water inlet 24 is connected to a water inlet pipe 3 provided with a water flowmeter 31 and a water regulating valve 32 thereon; the second dilute hydrochloric acid inlet 25 is connected to a hydrochloric acid pipe 4 provided with a hydrochloric acid flowmeter 41 and a hydrochloric acid regulating valve 42 thereon.

[0041] According to the present utility model, the ratio of the height between the water inlet 24 and the top of the secondary falling film absorber 2, the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1: 2.0 - 3.0: 0.3 - 0.6. When the height between the water inlet 24 and the top of the secondary falling film absorber 2 and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 are within the above ranges, if the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25 is less than 2.0, it will lead to poor secondary absorption effect and low hydrogen chloride recovery rate; if the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25 is greater than 3.0, the improvement of the secondary absorption effect is not obvious, but instead increases the equipment manufacturing cost; therefore, it is appropriate that the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25 is 2.0 - 3.0;

[0042] When the height between the water inlet 24 and the top of the secondary falling film absorber 2 and the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25 are within the above ranges, if the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is less than 0.3, it will lead to too small flange spacing and is not conducive to installation; if the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is greater than 0.6, the cooling effect is poor and affects the absorption effect; therefore, it is advisable that the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 0.3 - 0.6;

[0043] The water flowmeter 31 and the hydrochloric acid flowmeter 41 used in the present utility model are vortex flowmeters or rotameters, and they are all products sold on the current market. For example, products sold by Dalian Longfeng Instrumentation Co., Ltd. under the trade names of vortex flowmeters or rotameters.

[0044] The water regulating valve 32 and the hydrochloric acid regulating valve 42 used in the present utility model are pneumatic regulating valves or electric regulating valves, and they are all products sold on the current market. For example, products sold by Nanjing Benbang Automation Equipment Co., Ltd. under the trade names of pneumatic regulating valves or electric regulating valves.

[0045] The method for preparing hydrochloric acid from hydrogen chloride using the device of the present utility model is as follows:

[0046] Hydrogen chloride gas enters the first-stage falling film absorber 1 through the hydrogen chloride gas inlet pipe 9 from the hydrogen chloride gas inlet 11. At the same time, dilute hydrochloric acid from the second-stage falling film absorber 2 also enters the first-stage falling film absorber 1 through the liquid-phase connecting pipe 5 from the first dilute hydrochloric acid inlet 14. The hydrogen chloride gas and the dilute hydrochloric acid carry out gas-liquid mass transfer and dissolution in the falling film pipe, and at the same time, the second heat released is cooled and absorbed by circulating cooling water. Concentrated hydrochloric acid with a concentration of more than 32% by weight is obtained at the bottom of the first-stage falling film absorber 1. The unabsorbed hydrogen chloride gas enters the second-stage falling film absorber 2 through the gas-phase connecting pipe 7 from the hydrogen chloride gas outlet 15 and the hydrogen chloride gas inlet 22 for secondary absorption.

[0047] In the present utility model, the hydrochloric acid concentration is measured by the titration method. Specifically, bromocresol green is used as an indicator, and the sodium hydroxide standard titration solution is used to titrate until the solution changes from yellow to blue as the titration end point.

[0048] For the effect of preparing hydrochloric acid from hydrogen chloride using the device of the present utility model, please refer to the specific implementation part.

[0049] [Beneficial effects]

[0050] The beneficial effects of the present utility model are as follows: The device structure for absorbing hydrogen chloride to prepare hydrochloric acid in the present utility model is simple, the operation and control are convenient, the safety and reliability are high, and hydrogen chloride can be effectively absorbed to obtain high-concentration hydrochloric acid with a concentration of more than 32% by weight.

Description of the drawings

[0051] Figure 1 It is a schematic structural diagram of the present utility model for absorbing hydrogen chloride to prepare hydrochloric acid;

[0052] In the figure:

[0053] 1 - First-stage falling film absorber; 11 - Hydrogen chloride gas inlet; 12 - First circulating water return port; 13 - Circulating water inlet; 14 - First dilute hydrochloric acid inlet; 15 - Hydrogen chloride gas outlet; 16 - Concentrated hydrochloric acid discharge port; 2 - Second-stage falling film absorber; 21 - Tail gas outlet; 22 - Hydrogen chloride gas inlet; 23 - Circulating water inlet; 24 - Water inlet; 25 - Second dilute hydrochloric acid inlet; 26 - Second circulating water return port; 27 - Dilute hydrochloric acid outlet; 3 - Water inlet pipe; 31 - Water flowmeter; 32 - Water regulating valve; 4 - Hydrochloric acid pipe; 41 - Hydrochloric acid flowmeter; 42 - Hydrochloric acid regulating valve; 5 - Liquid-phase connecting pipe; 51 - Second thermometer; 6 - Concentrated hydrochloric acid discharge pipe; 61 - First thermometer; 7 - Gas-phase connecting pipe; 8 - Tail gas discharge pipe; 9 - Hydrogen chloride gas feed pipe.

[0054] Figure 2 It is a schematic structural diagram of the falling film pipe and the cooling pipe;

[0055] Figure 2 A:

[0056] a - Falling - film tube with circular - block hole structure; b - Cooling tube;

[0057] Figure 2 B:

[0058] a - Falling - film tube with shell - and - tube structure; c - Cooling tube;

Specific implementation manners

[0059] The present utility model can be better understood through the following embodiments.

[0060] Embodiment 1: Device of the present utility model for absorbing hydrogen chloride to prepare hydrochloric acid

[0061] The implementation manner of this embodiment is as follows:

[0062] The device of the present utility model for absorbing hydrogen chloride to prepare hydrochloric acid includes a primary falling - film absorber 1 and a secondary falling - film absorber 2, and it also includes a water inlet pipe 3, a hydrochloric acid pipe 4, a liquid - phase connecting pipe 5, a concentrated hydrochloric acid discharge pipe 6, a gas - phase connecting pipe 7, a tail - gas discharge pipe 8, and a hydrogen chloride gas feed pipe 9;

[0063] The primary falling - film absorber 1 used in the present utility model is a product sold by Nantong Heidun Graphite Equipment Co., Ltd. under the trade name GX - type shell - and - tube graphite falling - film absorber, and the ratio of its diameter to height is 1:5; the secondary falling - film absorber 2 used in the present utility model is a product sold by Nantong Heidun Graphite Equipment Co., Ltd. under the trade name YKX circular - block hole - type graphite falling - film absorber, and the ratio of its diameter to height is 1:8;

[0064] A hydrogen chloride gas inlet 11 is arranged at the upper part of the primary falling - film absorber 1, and it is connected to the hydrogen chloride gas feed pipe 9. On the same side below it, a first circulating water return port 12 and a circulating water inlet port 13 are arranged in sequence from top to bottom; the ratio of the height between the hydrogen chloride gas inlet 11 and the top of the primary falling - film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet port 13 is 1:1.4:2.6;

[0065] A first dilute hydrochloric acid inlet 14 is arranged on the side opposite to the hydrogen chloride gas inlet 11, and a hydrogen chloride gas outlet 15 is arranged below it on the same side; the ratio of the height between the first dilute hydrochloric acid inlet 14 and the top of the primary falling - film absorber 1 and the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:8;

[0066] A concentrated hydrochloric acid discharge port 16 is arranged in the middle of the bottom of the primary falling - film absorber 1, and it is connected to the concentrated hydrochloric acid discharge pipe 6 on which a first thermometer 61 sold by Wuxi Zhongce Sensor Technology Co., Ltd. under the trade name armored thermal resistance is arranged;

[0067] A tail gas outlet 21 is provided in the middle at the top of the secondary falling film absorber 2, which is connected to a tail gas discharge pipe 8. A dilute hydrochloric acid outlet 27 is provided in the middle at its bottom, and it is connected to the first dilute hydrochloric acid inlet 14 of the primary falling film absorber 1 through a liquid phase connecting pipe 5 provided thereon with a second thermometer 51 sold under the trade name armored thermocouple by Wuxi Zhongce Sensor Technology Co., Ltd.;

[0068] A hydrogen chloride gas inlet 22 and a circulating water inlet 23 are sequentially arranged from top to bottom in the middle on one side of the secondary falling film absorber 2. The hydrogen chloride gas inlet 22 is connected to the hydrogen chloride gas outlet 15 of the primary falling film absorber 1 through a gas phase connecting pipe 7; the ratio of the height between the hydrogen chloride gas inlet 22 and the top of the secondary falling film absorber 2 to the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.6;

[0069] An inlet 24, a second dilute hydrochloric acid inlet 25 and a second circulating water return port 26 are sequentially arranged from top to bottom on the other side of the secondary falling film absorber 2; the ratio of the height between the inlet 24 and the top of the secondary falling film absorber 2, the height between the inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1:3.0:0.4;

[0070] The inlet 24 is connected to a water inlet pipe 3 provided with a water flowmeter 31 and a water regulating valve 32 thereon; among them, the water flowmeter 31 is a product sold under the trade name vortex flowmeter by Dalian Longfeng Instrument Co., Ltd., and the water regulating valve 32 is a product sold under the trade name pneumatic regulating valve by Nanjing Benbang Automation Equipment Co., Ltd.;

[0071] The second dilute hydrochloric acid inlet 25 is connected to a hydrochloric acid pipe 4 provided with a hydrochloric acid flowmeter 41 and a hydrochloric acid regulating valve 42 thereon. Among them, the hydrochloric acid flowmeter 41 is a product sold under the trade name rotameter by Dalian Longfeng Instrument Co., Ltd.; the hydrochloric acid regulating valve 42 is a product sold under the trade name electric regulating valve by Nanjing Benbang Automation Equipment Co., Ltd.

[0072] Using the device of the present utility model to conduct tests according to the preparation method described in the specification of the present utility model, high-concentration hydrochloric acid with a concentration of 32.5% by weight is obtained.

[0073] Example 2: Device of the present utility model for absorbing hydrogen chloride to prepare hydrochloric acid

[0074] The implementation method of this example is the same as that of Example 1, except for the following technical content: the ratio of the diameter to the height of the primary falling film absorber 1 is 1:8; the ratio of the diameter to the height of the secondary falling film absorber 2 is 1:6;

[0075] The height ratio between the hydrogen chloride gas inlet 11 and the top of the first falling film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet 13 is 1:1.0:2.0; the height ratio between the first dilute hydrochloric acid inlet 14 and the top of the first falling film absorber 1 and the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:9;

[0076] The height ratio between the hydrogen chloride gas inlet 22 and the top of the second falling film absorber 2 and the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.5; the height ratio between the water inlet 24 and the top of the second falling film absorber 2, the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1:2.0:0.3;

[0077] Using the device of the present utility model and conducting tests according to the preparation method described in the specification of the present utility model, high-concentration hydrochloric acid with a concentration of 33.2% by weight is obtained.

[0078] Example 3: Device for absorbing hydrogen chloride to prepare hydrochloric acid of the present utility model

[0079] The implementation manner of this example is the same as that of Example 1, except for the following technical content: the ratio of the diameter to the height of the first falling film absorber 1 is 1:6; the ratio of the diameter to the height of the second falling film absorber 2 is 1:7;

[0080] The height ratio between the hydrogen chloride gas inlet 11 and the top of the first falling film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet 13 is 1:1.2:2.4; the height ratio between the first dilute hydrochloric acid inlet 14 and the top of the first falling film absorber 1 and the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:10;

[0081] The height ratio between the hydrogen chloride gas inlet 22 and the top of the second falling film absorber 2 and the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.8; the height ratio between the water inlet 24 and the top of the second falling film absorber 2, the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1:2.4:0.5;

[0082] Using the device of the present utility model and conducting tests according to the preparation method described in the specification of the present utility model, high-concentration hydrochloric acid with a concentration of 33.8% by weight is obtained.

[0083] Example 4: Device for absorbing hydrogen chloride to prepare hydrochloric acid of the present utility model

[0084] The implementation mode of this embodiment is the same as that of Embodiment 1, except for the following technical content: the ratio of the diameter to the height of the first-stage falling film absorber 1 is 1:7; the ratio of the diameter to the height of the second-stage falling film absorber 2 is 1:5;

[0085] The ratio of the height between the hydrogen chloride gas inlet 11 and the top of the first-stage falling film absorber 1, the height between the hydrogen chloride gas inlet 11 and the first circulating water return port 12, and the height between the first circulating water return port 12 and the circulating water inlet 13 is 1:1.5:3.0; the ratio of the height between the first dilute hydrochloric acid inlet 14 and the top of the first-stage falling film absorber 1 to the height between the first dilute hydrochloric acid inlet 14 and the hydrogen chloride gas outlet 15 is 1:9;

[0086] The ratio of the height between the hydrogen chloride gas inlet 22 and the top of the second-stage falling film absorber 2 to the height between the hydrogen chloride gas inlet 22 and the circulating water inlet 23 is 1:0.7; the ratio of the height between the water inlet 24 and the top of the second-stage falling film absorber 2, the height between the water inlet 24 and the second dilute hydrochloric acid inlet 25, and the height between the second dilute hydrochloric acid inlet 25 and the second circulating water return port 26 is 1:2.8:0.6;

[0087] Using the device of the present utility model and conducting tests according to the preparation method described in the specification of the present utility model, high-concentration hydrochloric acid with a concentration of 32.9% by weight is obtained.

Claims

1. A device for preparing hydrochloric acid by absorbing hydrogen chloride, comprising a primary falling film absorber (1) and a secondary falling film absorber (2), characterized in that It also includes a water inlet pipe (3), a hydrochloric acid pipe (4), a liquid-connecting pipe (5), a concentrated hydrochloric acid discharge pipe (6), a gas-connecting pipe (7), an exhaust gas discharge pipe (8) and a hydrogen chloride gas feed pipe (9); A hydrogen chloride gas inlet (11) is provided at the top of the primary falling film absorber (1), which is connected to the hydrogen chloride gas feed pipe (9), and a first circulating water return port (12) and a circulating water inlet (13) are provided in order from top to bottom on the same side and below; a first dilute hydrochloric acid inlet (14) is provided on the side opposite to the hydrogen chloride gas inlet (11), and a hydrogen chloride gas outlet (15) is provided on the same side and below; a concentrated hydrochloric acid outlet (16) is provided in the middle of the bottom of the primary falling film absorber (1), which is connected to the concentrated hydrochloric acid outlet pipe (6) on which a first thermometer (61) is provided; A tail gas outlet (21) is provided in the middle of the top of the secondary falling film absorber (2), which is connected to the tail gas discharge pipe (8); a dilute hydrochloric acid outlet (27) is provided in the middle of the bottom thereof, which is connected to the first dilute hydrochloric acid inlet (14) of the primary falling film absorber (1) through a liquid connection pipe (5) on which a second thermometer (51) is provided; a hydrogen chloride gas inlet (22) and a circulating water inlet (23) are provided in sequence from top to bottom in the middle of one side of the secondary falling film absorber (2); the hydrogen chloride gas inlet (22) is connected to the first dilute hydrochloric acid inlet (14) of the primary falling film absorber (1) through a liquid connection pipe (5) on which a second thermometer (51) is provided; The connecting pipe (7) is connected to the hydrogen chloride gas outlet (15) of the first falling film absorber (1); a water inlet (24), a second dilute hydrochloric acid inlet (25) and a second circulating water return port (26) are arranged in sequence from top to bottom on the other side; the water inlet (24) is connected to a water inlet pipeline (3) on which a water flow meter (31) and a water regulating valve (32) are arranged; the second dilute hydrochloric acid inlet (25) is connected to a hydrochloric acid pipeline (4) on which a hydrochloric acid flow meter (41) and a hydrochloric acid regulating valve (42) are arranged.

2. The device according to claim 1, characterized in that The first-stage falling film absorber (1) and the second-stage falling film absorber (2) are cylindrical absorbers in which falling film tubes and cooling tubes are arranged in parallel with the falling film absorber cylinder.

3. The device according to claim 2, characterized in that The falling film tube has a round block hole type or a tube-in-tube type structure; the cooling tube is a tube structure.

4. The device according to claim 1, characterized in that The ratio of the diameter to the height of the first-stage falling film absorber (1) and the second-stage falling film absorber (2) is 1:5-8.

5. The device according to claim 1, characterized in that The ratio of the height between the hydrogen chloride gas inlet (11) and the top of the primary falling film absorber (1), the height between the hydrogen chloride gas inlet (11) and the first circulating water return port (12), and the height between the first circulating water return port (12) and the circulating water inlet (13) is 1:1.0-1.5:2.0-3.

0.

6. The device according to claim 1, characterized in that The ratio of the height between the first dilute hydrochloric acid inlet (14) and the top of the primary falling film absorber (1) to the height between the first dilute hydrochloric acid inlet (14) and the hydrogen chloride gas outlet (15) is 1:8-10.

7. The device according to claim 1, characterized in that The ratio of the height between the hydrogen chloride gas inlet (22) and the top of the secondary falling film absorber (2) to the height between the hydrogen chloride gas inlet (22) and the circulating water inlet (23) is 1:0.5-0.

8.

8. The device according to claim 1, characterized in that The ratio of the height between the water inlet (24) and the top of the secondary falling film absorber (2), the height between the water inlet (24) and the second dilute hydrochloric acid inlet (25), and the height between the second dilute hydrochloric acid inlet (25) and the second circulating water return port (26) is 1:2.0-3.0:0.3-0.

6.

9. The device according to claim 1, characterized in that The first thermometer (61) and the second thermometer (51) are thermocouple thermometers or thermal resistance thermometers.

10. The device according to claim 1, characterized in that The water flow meter (31) and the hydrochloric acid flow meter (41) are vortex flow meters or rotor flow meters; the water regulating valve (32) and the hydrochloric acid regulating valve (42) are pneumatic regulating valves or electric regulating valves.

Images