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Method for directly producing sodium bromide from low-concentration brine

A sodium bromide, low-concentration technology, applied in the direction of alkali metal bromide, can solve the problems of increased energy consumption, cost, and many production processes, and achieve the effects of avoiding pollution, convenient storage, and thorough exhaust gas absorption

Active Publication Date: 2022-05-06
天津长芦汉沽盐场有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the production of sodium bromide is generally produced by neutralizing hydrobromic acid and sodium hydroxide, or using sodium carbonate and sodium hydroxide to absorb bromine, and then reducing production with a reducing agent. There are many production processes, which increase energy consumption and cost.

Method used

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  • Method for directly producing sodium bromide from low-concentration brine

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Embodiment 1

[0031] A method for directly producing sodium bromide from low-concentration brine (concentrated seawater), the flow chart is as follows figure 1 shown, including the following steps:

[0032] (1) Add sulfuric acid to the low-grade brine (concentrated seawater) pipeline entering the oxidation tower to adjust the pH of the low-grade brine (concentrated seawater) to 3.6. Then add chlorine gas into the low-degree brine (concentrated seawater) pipeline, the amount of chlorine added is 48% of the bromine content in the concentrated seawater, and fully mix in the acidification oxidation tower.

[0033] (2) The acidizing oxidizing liquid enters the blowing tower from the top, flows out from top to bottom through the nozzle, and the bromine vapor released by oxidation is blown out from the blowing tower by the air from bottom to top, so as to obtain bromine-containing air and bromine-extracted low concentration For brine, add magnesium oxide to the low-grade brine after bromine extra...

Embodiment 2

[0039] A method for directly producing sodium bromide from low-concentration brine (concentrated seawater), comprising the following steps:

[0040] (1) Add sulfuric acid to the low-grade brine (concentrated seawater) pipeline entering the oxidation tower to adjust the pH of the low-grade brine (concentrated seawater) to 3.2. Then add chlorine gas to the low-degree brine (concentrated seawater) delivery pipeline, the amount of chlorine added is 46% of the bromine content in the concentrated seawater, and then enter the acidification oxidation tower to fully mix.

[0041](2) The acidizing oxidizing liquid enters the blowing tower from the top, flows out from top to bottom through the nozzle, and the bromine vapor released by oxidation is blown out from the blowing tower by the air from bottom to top, so as to obtain bromine-containing air and bromine-extracted low concentration After the bromine is extracted from the brine, magnesium oxide is added to the low-concentration brin...

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Abstract

The invention provides a method for directly producing sodium bromide from low-concentration brine, which can avoid the consumption of chlorine and steam in the process of sulfur dioxide absorption and distillation in industrial bromine production, shorten the production process, produce sodium bromide products convenient to store and transport, solve the storage problem of industrial bromine in real factories, and reduce the production cost. And the quality of the sodium bromide product is relatively high.

Description

technical field [0001] The invention belongs to the field of sodium bromide production technology, and in particular relates to a method for directly producing sodium bromide from low-concentration brine. Background technique [0002] Sodium bromide has a wide range of applications, and can be used to prepare photosensitive film, and can be used as a diuretic and a sedative in medicine. In the synthetic perfume industry, it is used as a brominating agent in the printing and dyeing industry, and it is also used in the preparation of detergents for automatic dishwashers. The main raw material of sodium bromide is industrial bromine. my country can produce 150,000 to 160,000 tons of bromine per year, becoming the third largest producer of bromine in the world after the United States and Israel. However, my country is also a big bromine user in the world, and needs to import bromine annually. More than 30,000 tons. After nearly ten years of large-scale mining, the bromine conte...

Claims

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Application Information

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IPC IPC(8): C01D3/10
CPCC01D3/10C01P2006/80
Inventor 刘立平
Owner 天津长芦汉沽盐场有限责任公司
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