Sulfuric acid separation system for bromine production completion liquid

Abstract

The utility model relates to a sulfuric acid separation system for bromine production completion liquid, and belongs to the technical field of inorganic chemical equipment. The system comprises a foam catching chamber, an absorption tower, an MRO membrane, a sulfuric acid tank and a hydrobromic acid tank, the bottoms of the foam catching chamber and the absorption tower are connected with a high-pressure pump through a finished liquid conveying pipeline, the high-pressure pump is connected with the input end of the MRO membrane, the output end of the MRO membrane is connected with the sulfuric acid tank and the hydrobromic acid tank, and the sulfuric acid tank is connected with an acidified brine line and a sulfuric acid loading pipeline through the sulfuric acid pump. The hydrobromic acid tank is connected with a distillation system and a hydrobromic acid loading pipeline through a hydrobromic acid pump. According to the utility model, sulfuric acid and hydrobromic acid in the finished liquid are separated by using the MRO membrane, and the separated sulfuric acid and hydrobromic acid are used for production or sale, so that the pattern of a single bromine product is refreshed.

Description

Technical Field

[0001] This utility model relates to a sulfuric acid separation system for bromine production liquid, belonging to the field of inorganic chemical equipment technology. Background Technology

[0002] In the bromine production process, when extracting bromine from seawater (or brine), sulfuric acid is used to acidify the brine to facilitate subsequent oxidation with chlorine, producing elemental bromine. Acidification creates an acidic environment conducive to the oxidation reaction. The oxidized brine then enters a blow-out tower, where elemental bromine is separated from the brine by air blowing. The bromine-containing gas reacts with sulfur dioxide and fresh water spray to produce hydrobromic acid and sulfuric acid (formula: Br2 + SO2 + 2H2O → 2HBr + H2SO4). These small droplets containing hydrobromic acid and sulfuric acid are absorbed and enriched in an absorption tower, condensing into a liquid that eventually flows into a finished liquid storage tank. The absorption tower increases the bromine concentration by absorbing and enriching free bromine, resulting in a finished liquid that facilitates subsequent extraction and processing. The exhaust gas from the absorption tower enters a mist eliminator. The main function of the mist eliminator is to purify the gas and absorb residual hydrobromic acid, removing droplets and impurities from the gas separated in the absorption tower. This prevents droplets from entering the circulation system, avoiding damage or impact on production efficiency.

[0003] The finished solution is actually a mixture of hydrobromic acid and sulfuric acid. Sulfuric acid exists as a byproduct. It participates in the distillation process along with the finished solution, but does not participate in the reaction.

[0004] During brine acidification, the pH is generally controlled at 3.0-3.2 in summer (peak production season) and 2.8-3.0 in spring, autumn, and winter (off-season). In production, the bromine content in the brine is directly proportional to the amount of sulfur used; that is, the higher the bromine content, the higher the sulfuric acid production. When the bromine content in the brine reaches 115 g / m³... 3 The waste acid production is roughly equivalent to the acid consumption. Meanwhile, to meet environmental protection requirements and avoid impacting downstream aquaculture production, the brine after bromine blowing must be neutralized with a suitable alkaline solution before being discharged downstream. When the bromine content exceeds 115 g / m³... 3 In such cases, excessive waste acid will be generated. If the waste acid is used in production, it will consume a large amount of alkali solution, increasing production costs. If it is discharged directly without treatment, it will damage the natural ecosystem. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sulfuric acid separation system for bromine production liquid. It utilizes an MRO membrane to separate sulfuric acid and hydrobromic acid from the liquid. The separated sulfuric acid and hydrobromic acid can be used for production or sales, thus breaking away from the single bromine product model and enriching the product range. This not only turns hazardous waste into economic benefits but also has greater significance for protecting the natural environment.

[0006] The technical solution of this utility model is as follows:

[0007] A sulfuric acid separation system for bromine production finished liquid includes a condenser chamber, an absorption tower, a MRO membrane, a sulfuric acid tank, and a hydrobromic acid tank. The condenser chamber and the bottom of the absorption tower are connected to a high-pressure pump via a finished liquid delivery pipeline. The high-pressure pump is connected to the input end of the MRO membrane, and the output end of the MRO membrane is connected to the sulfuric acid tank and the hydrobromic acid tank, respectively. The sulfuric acid tank is connected to an acidified brine line and a sulfuric acid loading pipeline via a sulfuric acid pump. The acidified brine line is an existing bromine production line that directly returns sulfuric acid for reuse. The hydrobromic acid tank is connected to a distillation system and a hydrobromic acid loading pipeline via a hydrobromic acid pump.

[0008] According to the preferred embodiment of this invention, at least two MRO membranes are connected in series to perform multiple separations of the finished liquid, ensuring the desired effect.

[0009] According to a preferred embodiment of this utility model, a remote pressure gauge and a solenoid valve A are installed on the connecting pipe between the high-pressure pump and the MRO membrane. The frequency of the high-pressure pump and the opening degree of the solenoid valve A are adjusted by the remote pressure gauge to control the flow rate and pressure of the finished liquid.

[0010] According to a preferred embodiment of this invention, a manual valve A is provided on the connecting pipeline between the MRO membrane and the hydrobromic acid tank, and a manual valve B is provided on the connecting pipeline between the MRO membrane and the sulfuric acid tank, to facilitate sampling and testing of the concentration and content of hydrobromic acid and sulfuric acid.

[0011] According to a preferred embodiment of this utility model, a solenoid valve B is provided between the sulfuric acid pump and the acidified brine line, a solenoid valve C is provided between the sulfuric acid pump and the sulfuric acid loading pipeline, a solenoid valve D is provided between the hydrobromic acid pump and the distillation system, and a solenoid valve E is provided between the hydrobromic acid pump and the hydrobromic acid loading pipeline.

[0012] In use, the finished liquid is pumped to the MRO membrane by a high-pressure pump. The MRO membrane separates the hydrobromic acid and sulfuric acid in the finished liquid, which flow into the sulfuric acid tank and the hydrobromic acid tank respectively. The sulfuric acid in the sulfuric acid tank flows into the acidified brine line to continue bromine production, or is directly transported to the shipping truck for sale through the sulfuric acid loading pipeline. The hydrobromic acid in the hydrobromic acid tank flows into the distillation system for distillation to obtain bromine and hydrochloric acid, or is directly transported to the shipping truck for sale through the hydrobromic acid loading pipeline.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention utilizes a MRO membrane to separate sulfuric acid and hydrobromic acid from the finished product. The separated sulfuric acid and hydrobromic acid can be used for production or sale, thus changing the single-product bromine model, enriching the product range, turning hazardous waste into economic benefits, and also having a greater protective significance for the natural environment. This method is suitable for bromine content exceeding 115 g / m³. 3 The brine bromine extraction process is of great significance, especially in solving the problem of bromine content reaching 200-300 g / m³. 3The underground brine bromine extraction process addresses the industry challenge of treating excess waste acid. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the MRO membrane structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the MRO membrane principle of this utility model;

[0018] In the diagram: 1. Foam trap, 2. Absorption tower, 3. High-pressure pump, 4. Remote pressure gauge, 5. Solenoid valve A, 6. MRO membrane A, 7. MRO membrane B, 8. MRO membrane C, 9. MRO membrane D, 10. Sulfuric acid tank, 11. Hydrobromic acid tank, 12. Solenoid valve D, 13. Solenoid valve E, 14. Solenoid valve B, 15. Solenoid valve C, 16. Manual valve B, 17. Manual valve A, 18. Finished liquid delivery pipeline, 19. Acidified brine line, 20. Sulfuric acid loading pipeline, 21. Distillation system, 22. Hydrobromic acid loading pipeline, 23. Hydrobromic acid pump, 24. Sulfuric acid pump.

[0019] 61. Concentrate; 62. Permeate; 63. Perforated central tube; 64. Membrane; 65. Flow guide net. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0021] Example 1:

[0022] like Figure 1 As shown, this embodiment provides a sulfuric acid separation system for bromine production finished liquid, including a demister 1, an absorption tower 2, an MRO membrane, a sulfuric acid tank 10, and a hydrobromic acid tank 11. The bottom of the demister 1 and the absorption tower 2 are connected to a high-pressure pump 3 via a finished liquid delivery pipeline 18. The high-pressure pump 3 is connected to the input end of the MRO membrane, and the output end of the MRO membrane is connected to the sulfuric acid tank 10 and the hydrobromic acid tank 11, respectively. The sulfuric acid tank 10 is connected to an acidified brine line 19 and a sulfuric acid loading pipeline 20 via a sulfuric acid pump 24. The acidified brine line is an existing bromine production line that directly returns sulfuric acid for reuse. The hydrobromic acid tank 11 is connected to a distillation system 21 and a hydrobromic acid loading pipeline 22 via a hydrobromic acid pump 23.

[0023] Four MRO membranes are connected in series: MRO membrane A6, MRO membrane B7, MRO membrane C8 and MRO membrane D9, which perform multiple separations of the finished liquid to ensure effectiveness.

[0024] MRO membranes are used in existing equipment, such as Figure 2 and Figure 3As shown, the filtration principle is mainly based on the "micropore filtration" principle, that is, the membrane surface has a large number of uniformly distributed micropores, which can selectively filter molecules of different particle sizes in the solution. The diameter of sulfate ions is about 0.56 to 0.64 nanometers (nm), the diameter of bromide ions is about 0.1 nanometers, and the diameter of water molecules is about 0.4 nanometers. The pore size range of MRO membranes is usually between 0.4 and 0.5 nanometers (nm), which is a highly efficient separation membrane. The entire membrane module has two discharge streams. One stream is the permeate along the wall of the cylindrical membrane module, which is hydrobromic acid with a very low sulfate content, such as H2SO4; the other stream is the concentrated sulfuric acid discharged along the central axis.

[0025] The connection pipe between the high-pressure pump 3 and the MRO membrane A6 is equipped with a remote pressure gauge 4 and a solenoid valve A5. The frequency of the high-pressure pump and the opening degree of the solenoid valve A are adjusted by the remote pressure gauge to control the flow rate and pressure of the finished liquid.

[0026] A manual valve A17 is installed on the connecting pipeline between MRO membrane D9 and hydrobromic acid tank 11, and a manual valve B16 is installed on the connecting pipeline between MRO membrane D9 and sulfuric acid tank 10, to facilitate sampling and testing of the concentration and content of hydrobromic acid and sulfuric acid.

[0027] A solenoid valve B14 is installed between the sulfuric acid pump 24 and the acidified brine line 19; a solenoid valve C15 is installed between the sulfuric acid pump 24 and the sulfuric acid loading pipeline 20; a solenoid valve D12 is installed between the hydrobromic acid pump 23 and the distillation system 21; and a solenoid valve E13 is installed between the hydrobromic acid pump 23 and the hydrobromic acid loading pipeline 22.

[0028] In use, the finished liquid is pumped to the MRO membrane by a high-pressure pump. The MRO membrane separates the hydrobromic acid and sulfuric acid in the finished liquid, which flow into the sulfuric acid tank and the hydrobromic acid tank respectively. The sulfuric acid in the sulfuric acid tank flows into the acidified brine line to continue bromine production, or is directly transported to the shipping truck for sale through the sulfuric acid loading pipeline. The hydrobromic acid in the hydrobromic acid tank flows into the distillation system for distillation to obtain bromine and hydrochloric acid, or is directly transported to the shipping truck for sale through the hydrobromic acid loading pipeline.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bromine production completion sulfuric acid separation system, characterized by, The device comprises a foam trap, an absorption tower, an MRO membrane, a sulfuric acid tank and a hydrobromic acid tank, wherein the bottom of the foam trap and the absorption tower is connected with a high-pressure pump through a complete liquid conveying pipeline, the high-pressure pump is connected with an MRO membrane input end, the MRO membrane output end is respectively connected with the sulfuric acid tank and the hydrobromic acid tank, the sulfuric acid tank is connected with an acidified brine line and a sulfuric acid loading pipeline through a sulfuric acid pump, and the hydrobromic acid tank is connected with a distillation system and a hydrobromic acid loading pipeline through a hydrobromic acid pump.

2. The bromine production completion sulfuric acid separation system of claim 1, wherein, The MRO membrane is provided with at least two in series.

3. The bromine production completion sulfuric acid separation system of claim 1, wherein, A remote pressure gauge and an electromagnetic valve A are arranged on the connecting pipeline of the high-pressure pump and the MRO membrane.

4. The bromine production completion sulfuric acid separation system of claim 1, wherein, A hand valve A is arranged on the connecting pipeline of the MRO membrane and the hydrobromic acid tank, and a hand valve B is arranged on the connecting pipeline of the MRO membrane and the sulfuric acid tank.

5. The bromine production completion sulfuric acid separation system of claim 1, wherein, An electromagnetic valve B is arranged between the sulfuric acid pump and the acidified brine line, an electromagnetic valve C is arranged between the sulfuric acid pump and the sulfuric acid loading pipeline, an electromagnetic valve D is arranged between the hydrobromic acid pump and the distillation system, and an electromagnetic valve E is arranged between the hydrobromic acid pump and the hydrobromic acid loading pipeline.

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