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Process for producing bromine by electrolytically acidizing sodium bromide

A process method and sodium bromide technology are applied in the directions of electrolysis components, electrolysis processes, electrodes, etc., which can solve the problems of large consumption of chlorine gas, and achieve the effects of reducing potential safety hazards, improving economic benefits, and meeting environmental protection requirements.

Pending Publication Date: 2021-12-14
SHANDONG HAIWANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of bromine from sodium bromide generally adopts the process of chlorine gas oxidation and distillation to extract bromine. The reaction formula is: 2NaBr+Cl 2 →2NaCl+Br 2 , the production of this process needs to consume a large amount of chlorine gas, and also produces a large amount of acidic high-salt wastewater that is difficult to treat. The traditional method of using chlorine gas to oxidize sodium bromide to distill and extract bromine is facing huge environmental pressure

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  • Process for producing bromine by electrolytically acidizing sodium bromide
  • Process for producing bromine by electrolytically acidizing sodium bromide
  • Process for producing bromine by electrolytically acidizing sodium bromide

Examples

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Embodiment 1

[0051] Such as Figure 2-6 As shown, an electrolytic cell includes a closed outer casing, an electrolytic device is arranged inside the outer casing, an electrolyte inlet is arranged at the bottom of the electrolytic cell, and a liquid overflow is arranged at the upper part of the electrolytic cell mouth, the top of the electrolytic cell is provided with a gas outlet.

[0052] The electrolysis device includes a cathode end plate 1 and an anode end plate 2 arranged in parallel, and the terminal plate 3 on the upper part of the cathode end plate 1 and the anode end plate 2 is respectively connected to the negative and positive poles of an external power supply. In this embodiment, the Four groups of unit cells 4 are arranged between the cathode end plate 1 and the anode end plate 2, and the unit cells 4 include an anode plate 5, a cathode plate 6, and a zigzag-shaped plate connected to the anode plate 5 and the cathode plate 6 respectively. The connection plate 7, the anode pla...

Embodiment 2

[0059] Such as figure 1 Shown, the process method that electrolytic acidification sodium bromide produces bromine may further comprise the steps:

[0060] A: Dissolve solid sodium bromide in water to obtain sodium bromide solution, acidify the sodium bromide solution with hydrochloric acid to obtain acidified sodium bromide solution, the concentration of sodium bromide in the acidified sodium bromide solution is 20%, the concentration of hydrochloric acid 4%.

[0061] B: The acidified sodium bromide solution is pumped into the bottom of the electrolytic cell in Example 1 according to a certain flow rate, and the hydrogen gas produced enters the hydrogen scrubber from the top of the electrolytic cell and is stored after removing a small amount of bromine gas, and the bromine produced The element is dissolved in the acidified sodium bromide solution in the electrolytic cell to form a mixed solution and enters the bromine distillation tower from the top overflow port of the elec...

Embodiment 3

[0073] Such as figure 1 Shown, the process method that electrolytic acidification sodium bromide produces bromine may further comprise the steps:

[0074] A: Dissolve solid sodium bromide in water to obtain sodium bromide solution, acidify the sodium bromide solution with hydrochloric acid to obtain acidified sodium bromide solution, after acidification, the concentration of sodium bromide in the acidified sodium bromide solution is 25%, hydrochloric acid The concentration is 4%.

[0075] B: The acidified sodium bromide solution is pumped into the bottom of the electrolytic cell in Example 1 according to a certain flow rate, and the hydrogen gas produced enters the hydrogen scrubber from the top of the electrolytic cell and is stored after removing a small amount of bromine gas, and the bromine produced The element is dissolved in the acidified sodium bromide solution in the electrolytic cell to form a mixed solution and enters the bromine distillation tower from the top over...

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Abstract

The invention discloses a process for producing bromine by electrolyzing acidified sodium bromide. The process comprises the following steps: electrolyzing an acidified sodium bromide solution, dissolving the generated bromine in the acidified sodium bromide solution in an electrolytic bath to form a mixed solution, conducting distilling in a bromine distillation tower, and distilling out bromine in the bromine distillation tower to obtain the bromine. According to the invention, chlorine with large potential safety hazards does not need to be added to serve as a raw material in the whole process, so potential safety hazards in the processes of chlorine storage and use are reduced; and meanwhile, acid wastewater is not generated, follow-up treatment is not needed, resources are fully utilized, damage to the environment is avoided, environmental protection requirements are better met, and the economic benefits of enterprises are improved.

Description

technical field [0001] The invention relates to the technical field of bromine production, in particular to a process for producing bromine by electrolytic acidification of sodium bromide. Background technique [0002] Bromine is an important chemical raw material, widely used in high-efficiency flame retardants, refrigerants, petroleum finishing fluids, pharmaceuticals, fuel intermediates, and chemical reagents. The natural resources of bromine mainly exist in seawater, underground concentrated brine and salt lake water, and bromine is usually extracted by using concentrated seawater or brine. At present, the production of bromine from sodium bromide generally adopts the process of chlorine gas oxidation and distillation to extract bromine. The reaction formula is: 2NaBr+Cl 2 →2NaCl+Br 2 , the production of this process needs to consume a large amount of chlorine gas, and also produces a large amount of acidic high-salt wastewater that is difficult to treat. The tradition...

Claims

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Application Information

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IPC IPC(8): C25B1/24C25B1/50C25B11/031C25B11/052C25B11/054C25B11/063C25B11/081
CPCC25B1/24C25B1/50C25B11/031C25B11/052C25B11/054C25B11/063C25B11/081
Inventor 刘善书江秀军魏晓冬林春辉刘光良窦旭波
Owner SHANDONG HAIWANG CHEM
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