Reagent hydrochloric acid production device

Abstract

The utility model discloses a reagent hydrochloric acid production device which comprises a synthetic furnace, a hydrogen chloride distribution table is arranged at the downstream of the synthetic furnace, the hydrogen chloride distribution table is connected with a synthetic hydrochloric acid production system and a reagent hydrochloric acid falling film absorber group, and a free chlorine detector and a valve are arranged between the hydrogen chloride distribution table and the reagent hydrochloric acid falling film absorber group. And the downstream of the reagent hydrochloric acid falling film absorber group is connected with a detection tank and a filter. The reagent hydrochloric acid can be co-produced on the main body of the synthetic hydrochloric acid production system, the production of the reagent hydrochloric acid is realized through the reagent hydrochloric acid falling film absorber group, and compared with a method for producing the reagent hydrochloric acid through a distillation method in the prior art, the production energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a reagent hydrochloric acid production device. Background Technology

[0002] Reagent hydrochloric acid, as one of the three commonly used acids and two bases in laboratories, is widely used in various organic and inorganic synthesis experiments or chemical analysis tests. Reagent hydrochloric acid uses industrial hydrochloric acid as a raw material, with the main component, hydrogen chloride, containing more than 31%, and the reagent hydrochloric acid content required to be 36-38%. Existing methods for purifying reagent hydrochloric acid from industrial hydrochloric acid mainly involve distillation. Industrial hydrochloric acid is heated and evaporated under normal pressure, and the distilled hydrogen chloride gas is condensed to obtain reagent hydrochloric acid. The disadvantages of this method include high energy consumption, low production efficiency, high cost, poor continuity, and difficult equipment maintenance. For example, CN204588692U and CN00136160.0 both disclose a distillation purification apparatus for preparing reagent hydrochloric acid, but these still fail to solve the energy consumption problem caused by heating in the preparation of reagent hydrochloric acid. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a reagent hydrochloric acid production device, which solves the problem of high energy consumption caused by the distillation method in the existing technology.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A reagent hydrochloric acid production apparatus includes a synthesis furnace. Downstream of the synthesis furnace is a hydrogen chloride distribution station, which is connected to a synthetic hydrochloric acid production system and a reagent hydrochloric acid falling film absorber group. A free chlorine detector and a valve are provided between the hydrogen chloride distribution station and the reagent hydrochloric acid falling film absorber group. Downstream of the reagent hydrochloric acid falling film absorber group is a detection tank and a filter.

[0006] By employing the above structural design, the main body of the synthetic hydrochloric acid production system, along with the hydrogen chloride distribution station, distributes hydrogen chloride to the reagent hydrochloric acid falling film absorber group to produce reagent hydrochloric acid. Free chlorine is detected by a free chlorine detector and valves, thereby ensuring that the reagent hydrochloric acid is free of free chlorine. Therefore, this application can co-produce reagent hydrochloric acid on the main body of the synthetic hydrochloric acid production system, achieving reagent hydrochloric acid production through the reagent hydrochloric acid falling film absorber group. Compared with the existing technology of producing reagent hydrochloric acid by distillation, this reduces production energy consumption.

[0007] Preferably, the reagent hydrochloric acid falling film absorber group includes a first-stage falling film absorber, a second-stage falling film absorber, and a third-stage falling film absorber arranged in series. After the gaseous hydrogen chloride gas is absorbed by the first-stage falling film absorber, the second-stage falling film absorber, and the third-stage falling film absorber in sequence, the liquid hydrochloric acid enters the detection tank for detection after passing through the third-stage falling film absorber, the second-stage falling film absorber, and the first-stage falling film absorber in sequence.

[0008] Using the above structural design, hydrogen chloride absorption efficiency can be achieved through a three-stage falling film absorber, while the energy consumption is relatively low.

[0009] Preferably, the three-stage falling film absorber is equipped with a tail gas recovery pipeline that is connected to the tail gas absorption tower of the synthetic hydrochloric acid production system.

[0010] By adopting the above structural design, excess hydrogen chloride tail gas can be directly recovered to the tail gas tower of the hydrochloric acid synthesis production system for absorption, eliminating the need for separate tail gas treatment and reducing equipment costs.

[0011] Preferably, the primary, secondary, and tertiary falling film absorbers all use circulating water as a cooling medium, and plate heat exchangers are provided at the liquid phase outlets of the primary and secondary falling film absorbers.

[0012] The above structural design uses circulating water as the cooling medium, resulting in lower condensation costs for hydrogen chloride. Furthermore, the plate heat exchanger further improves the condensation effect.

[0013] Preferably, the plate heat exchanger uses water at 5 degrees Celsius as the refrigerant.

[0014] Preferably, the hydrogen chloride distribution station is provided with a first pipeline and a second pipeline. The first pipeline is connected to the synthetic hydrochloric acid production system for producing synthetic hydrochloric acid with a concentration of 31%, and the second pipeline is connected to the reagent hydrochloric acid falling film absorber group for producing reagent hydrochloric acid with a concentration of 36%.

[0015] Preferably, the second pipeline is equipped with the free chlorine detector and valve.

[0016] Preferably, the synthetic hydrochloric acid production system includes a primary falling film absorber and a secondary falling film absorber connected in series, and a tail gas absorption tower is connected to the secondary falling film absorber. A synthetic hydrochloric acid storage tank is connected to the liquid phase outlet of the primary falling film absorber.

[0017] Using the above structural design, synthetic hydrochloric acid is produced by setting up a primary falling film absorber and a secondary falling film absorber for synthesizing hydrochloric acid. The principle of synthetic hydrochloric acid is the same as that of reagent hydrochloric acid, and the production cost is lower.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This utility model achieves the production of reagent hydrochloric acid through a three-stage absorption process of a reagent hydrochloric acid falling film absorber group. Compared with the existing technology of producing reagent hydrochloric acid by distillation, it reduces the production energy consumption. Furthermore, by setting up a free chlorine detector and valves to detect free chlorine, it ensures that the reagent hydrochloric acid does not contain free chlorine.

[0020] 2. This utility model utilizes the main body of the synthetic hydrochloric acid production system and the hydrogen chloride distribution station to distribute hydrogen chloride to the reagent hydrochloric acid falling film absorber group to produce reagent hydrochloric acid, thereby reducing equipment modification costs and enabling the synthetic hydrochloric acid production system to co-produce reagent hydrochloric acid. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the picture:

[0023] 1. Synthesis furnace; 2. Hydrogen chloride distribution platform; 2a. First pipeline; 2b. Second pipeline; 3. Synthetic hydrochloric acid production system; 3a. Tail gas absorption tower; 3b. First-stage falling film absorber for synthetic hydrochloric acid; 3c. Second-stage falling film absorber for synthetic hydrochloric acid; 3d. Synthetic hydrochloric acid storage tank; 4. Reagent hydrochloric acid falling film absorber group; 4a. First-stage falling film absorber; 4b. Second-stage falling film absorber; 4c. Third-stage falling film absorber; 5. Free chlorine detector; 6. Valve; 7. Detection tank; 8. Filter; 9. Plate heat exchanger; 10. Tail gas recovery pipeline. Detailed Implementation

[0024] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Please refer to 1. A reagent hydrochloric acid production apparatus includes a synthesis furnace 1, which has hydrogen and chlorine inlets. The hydrogen is slightly in excess, and the mixed gas is burned within the synthesis furnace 1 to produce hydrogen chloride gas. Downstream of the synthesis furnace 1 is a hydrogen chloride distribution station 2, which is connected to a synthetic hydrochloric acid production system 3 and a reagent hydrochloric acid falling film absorber group 4, thus forming a synthetic hydrochloric acid production line and a reagent hydrochloric acid production line. A free chlorine detector 5 and a valve 6 are installed between the hydrogen chloride distribution station 2 and the reagent hydrochloric acid falling film absorber group 4 to detect the free chlorine content. If free chlorine is present, the valve 6 can be closed to prevent the produced reagent hydrochloric acid from containing free chlorine and causing product defects. Downstream of the reagent hydrochloric acid falling film absorber group 4 is a detection tank 7 and a filter 8. The detection tank 7 is used to sample and test the reagent hydrochloric acid for the presence of free chlorine and its quality. The filter 8 is used to filter out any mechanical impurities that may be entrained, thereby improving product quality.

[0027] Specifically, the reagent hydrochloric acid falling film absorber group 4 includes a primary falling film absorber 4a, a secondary falling film absorber 4b, and a tertiary falling film absorber 4c arranged in series. Gaseous hydrogen chloride gas passes sequentially through the primary falling film absorber 4a, the secondary falling film absorber 4b, and the tertiary falling film absorber 4c, and is absorbed by pure water to form liquid hydrochloric acid. The liquid hydrochloric acid then passes sequentially through the tertiary falling film absorber 4c, the secondary falling film absorber 4b, and the primary falling film absorber 4a before entering the detection tank 7 for detection, ultimately producing reagent hydrochloric acid with a hydrochloric acid content of 36%. The principle of the falling film absorber is existing technology and will not be elaborated further.

[0028] The three-stage falling film absorber 4c is equipped with a tail gas recovery pipe 10 connected to the tail gas absorption tower 3a of the synthetic hydrochloric acid production system 3. This allows for the recovery of hydrogen chloride from the tail gas in the three-stage falling film absorber 4c into the tail gas absorption tower 3a of the synthetic hydrochloric acid production system 3. Since the reagent hydrochloric acid production device in this application is added to the existing synthetic hydrochloric acid production system 3, the tail gas absorption tower 3a is existing equipment. Therefore, the tail gas from the three-stage falling film absorber 4c does not require additional tail gas treatment equipment, thus reducing equipment costs. The tail gas absorption tower 3a in this application uses water spray to dissolve hydrogen chloride gas.

[0029] In this embodiment, the primary falling film absorber 4a, the secondary falling film absorber 4b, and the tertiary falling film absorber 4c all use circulating water as a cooling medium for cooling. Furthermore, the liquid phase outlets of the primary falling film absorber 4a and the secondary falling film absorber 4b are all equipped with plate heat exchangers 9. In this embodiment, the plate heat exchangers 9 use water at 5 degrees Celsius as a cooling medium.

[0030] Specifically, the hydrogen chloride distribution station 2 is equipped with a first pipeline 2a and a second pipeline 2b. The first pipeline 2a is connected to the synthetic hydrochloric acid production system 3 for producing synthetic hydrochloric acid with a concentration of 31%. The second pipeline 2b is connected to the reagent hydrochloric acid falling film absorber group 4 for producing reagent hydrochloric acid with a concentration of 36%. The second pipeline 2b is equipped with a free chlorine detector 5 and a valve 6. The free chlorine detector 5 and valve 6 can not only detect free chlorine to ensure that the reagent hydrochloric acid does not contain free chlorine, but also switch between the synthetic hydrochloric acid and reagent hydrochloric acid production lines, enabling the separate production of synthetic hydrochloric acid or its simultaneous production with reagent hydrochloric acid, thus improving the flexibility of the production line.

[0031] The synthetic hydrochloric acid production system 3 includes a primary falling film absorber 3b and a secondary falling film absorber 3c connected in series. A tail gas absorption tower 3a is connected to the secondary falling film absorber 3c. A synthetic hydrochloric acid storage tank 3d is connected to the liquid phase outlet of the primary falling film absorber 3b. The production principle of the synthetic hydrochloric acid is the same as that of reagent hydrochloric acid, both using falling film absorbers to absorb hydrochloric acid and achieve products with different concentrations of hydrochloric acid.

[0032] The working principle of this utility model is as follows:

[0033] The existing synthetic hydrochloric acid production system controls the chlorine-hydrogen ratio by using excess hydrogen to ensure complete chlorine reaction. However, unavoidable fluctuations during production can lead to excessive free chlorine levels, making it unsuitable for directly producing reagent hydrochloric acid. Therefore, this invention's reagent hydrochloric acid production device, based on the existing synthetic hydrochloric acid production system 3, connects a three-stage falling film absorber to a second pipeline 2b leading from the hydrogen chloride distribution station 2. A free chlorine detector 5 and a valve 6 are installed on the second pipeline 2b, allowing real-time detection of free chlorine in the hydrogen chloride entering the reagent hydrochloric acid falling film absorber group 4. The valve 6 can be used for emergency closure to ensure the reagent hydrochloric acid product is free of free chlorine. The free chlorine detector 5 and valve 6 are linked and automatically controlled; this principle is existing technology and will not be elaborated upon here. Gaseous hydrogen chloride sequentially enters the primary falling film absorber 4a, the secondary falling film absorber 4b, and the tertiary falling film absorber 4c, where it is absorbed by pure water and cooled to form liquid reagent hydrochloric acid. The reagent hydrochloric acid then sequentially flows through the tertiary falling film absorber 4c, the secondary falling film absorber 4b, and the primary falling film absorber 4a before entering the detection tank 7 for storage. Simultaneously, the reagent hydrochloric acid in the detection tank 7 is tested to determine if it contains free chlorine. After passing the test, the reagent hydrochloric acid passes through filter 8 and is then dispensed.

[0034] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A reagent hydrochloric acid production apparatus, characterized in that, The system includes a synthesis furnace (1), a hydrogen chloride distribution station (2) located downstream of the synthesis furnace (1), a hydrochloric acid synthesis production system (3) connected to a reagent hydrochloric acid falling film absorber group (4), a free chlorine detector (5) and a valve (6) located between the hydrogen chloride distribution station (2) and the reagent hydrochloric acid falling film absorber group (4), and a detection tank (7) and a filter (8) located downstream of the reagent hydrochloric acid falling film absorber group (4).

2. The reagent hydrochloric acid production apparatus as described in claim 1, characterized in that, The reagent hydrochloric acid falling film absorber group (4) includes a first-stage falling film absorber (4a), a second-stage falling film absorber (4b), and a third-stage falling film absorber (4c) arranged in series. After the gaseous hydrogen chloride gas is absorbed by the first-stage falling film absorber (4a), the second-stage falling film absorber (4b), and the third-stage falling film absorber (4c) in sequence, the liquid hydrochloric acid enters the detection tank (7) for detection after passing through the third-stage falling film absorber (4c), the second-stage falling film absorber (4b), and the first-stage falling film absorber (4a) in sequence.

3. The reagent hydrochloric acid production apparatus as described in claim 2, characterized in that, The three-stage falling film absorber (4c) is equipped with a tail gas recovery pipe (10) that is connected to the tail gas absorption tower (3a) of the synthetic hydrochloric acid production system (3).

4. The reagent hydrochloric acid production apparatus as described in claim 1, characterized in that, The first-stage falling film absorber (4a), the second-stage falling film absorber (4b) and the third-stage falling film absorber (4c) all use circulating water as a cooling medium for cooling, and plate heat exchangers (9) are provided at the liquid phase outlet of the first-stage falling film absorber (4a) and the second-stage falling film absorber (4b).

5. The reagent hydrochloric acid production apparatus as described in claim 4, characterized in that, The plate heat exchanger (9) uses water at 5 degrees Celsius as the refrigerant.

6. The reagent hydrochloric acid production apparatus as described in claim 1, characterized in that, The hydrogen chloride distribution station (2) is provided with a first pipeline (2a) and a second pipeline (2b). The first pipeline (2a) is connected to the synthetic hydrochloric acid production system (3) for producing synthetic hydrochloric acid with a concentration of 31%. The second pipeline (2b) is connected to the reagent hydrochloric acid falling film absorber group (4) for producing reagent hydrochloric acid with a concentration of 36%.

7. The reagent hydrochloric acid production apparatus as described in claim 6, characterized in that, The second pipeline (2b) is equipped with the free chlorine detector (5) and valve (6).

8. The reagent hydrochloric acid production apparatus as described in claim 1, characterized in that, The synthetic hydrochloric acid production system (3) includes a primary falling film absorber (3b) and a secondary falling film absorber (3c) connected in series. A tail gas absorption tower (3a) is connected to the secondary falling film absorber (3c), and a synthetic hydrochloric acid storage tank (3d) is connected to the liquid phase outlet of the primary falling film absorber (3b).

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