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Method for preparing sodium bromide by continuous multi-stage air blow

A technology of sodium bromide and air blowing, applied in the field of salt chemical industry, to achieve the effects of low production cost, high product purity and simple process equipment

Inactive Publication Date: 2010-03-03
DAZHOU HENGCHENG ENERGY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is the new sodium bromide production method designed for the deficiency of existing production method

Method used

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  • Method for preparing sodium bromide by continuous multi-stage air blow

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Effect test

Embodiment 1

[0020] Heat the bromine-containing brine to 90°C, acidify it with sulfuric acid in a mixer and oxidize the bromine into simple bromine with chlorine gas. The control end point of this process is the oxidation potential +1000mV, and the pH of the solution after acidification is 3.5; the solution containing bromine is sprayed into the tower from the middle of the air-blown tower, and hot air at 90°C is blown into the lower part of the tower under positive pressure, and the bromine is blown from the top of the tower Blow out, the volume ratio of the air volume to the bromine-containing solution is 70 times, and the debrominated brine flows out from the bottom of the tower. Pass bromine-containing air into two-stage bubbling washing tanks filled with sodium bromide solution for continuous washing twice to remove chlorine gas, salt mist and acid mist entrained in the gas. The first-stage washing liquid is prepared according to the ratio of 1.6:1 unoxidized bromine-containing raw ma...

Embodiment 2

[0022] Heat the bromine-containing brine to 30°C, acidify it with hydrochloric acid in a mixer, and oxidize the bromine element with chlorine gas. The control end point of this process is oxidation potential +980mV, and the pH of the solution after acidification is 4; the bromine-containing solution is blown from the middle of the tower Spray into the tower, and the lower part of the tower is blown with hot air at 80°C under positive pressure. The volume ratio of the air volume to the bromine-containing solution is 200 times. The bromine is blown out from the top of the tower, and the debrominated brine flows out from the bottom of the tower. Pass bromine-containing air into the two-stage bubbling washing tank containing sodium bromide solution for continuous washing twice to remove chlorine gas, salt mist and acid mist entrained in the gas. The first-stage washing liquid is prepared according to the ratio of 4 : 1 is prepared from unoxidized bromine-containing raw material wat...

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Abstract

The invention relates to a method for preparing sodium bromide by continuous multi-stage air blow in deep marine facies potassium-rich brine. Bromine-containing brine is processed by the working procedure of acidification and oxidation, heating air blow, washing, absorbtion and concentration, so that the sodium bromide can be prepared. The method has the advantages of simple technological equipment, low production cost and energy consumption, high product purity and yield, strong practicability and better economic and social benefits.

Description

(1) Technical field [0001] The invention belongs to the technical field of salt chemical industry, and in particular relates to a method for preparing sodium bromide in deep marine potassium-rich brine by continuous multi-stage air blowing. (2) Background technology [0002] At present, there are generally two industrial production methods for bromine, one is steam distillation, which requires high bromine content in raw materials and consumes a lot of heat; the other is the method of blowing out raw materials with low bromine content, this method There are disadvantages such as large amount of treated water, huge equipment, high investment, and the air blowing rate is greatly affected by air temperature and water temperature. And the bromine that makes still needs to just can obtain sodium bromide product through processes such as alkali absorption and reduction, and flow process is long, and recovery rate is not high. (3) Contents of the invention [0003] The purpose o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/10
Inventor 夏康明唐兵安普伟
Owner DAZHOU HENGCHENG ENERGY GROUP
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