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Method for extracting bromine from brine

A brine and bromine technology, applied in the directions of bromine, bromine/hydrogen bromide, etc., can solve the problems of bromine production capacity decline, brine grade decline, etc., and achieve the effect of improving extraction rate and high blowing rate.

Active Publication Date: 2015-01-28
新疆罗能化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, bromine resources are exploited in a large amount without order, resulting in a rapid decline in the grade of brine, and a rapid decline in bromine production capacity. The bromine industry is in a critical stage in which technology and products urgently need to be upgraded.

Method used

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  • Method for extracting bromine from brine

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Realize that the used bromine extracting device of process method of the present invention is as figure 1 As shown, it includes a gas-liquid mixer 1, a blowing tower 2, an absorption tower 3 and a distillation tower 4 arranged in sequence according to the process route. The gas and liquid mixer 1 is an existing product including a mixer main body 10, the mixer main body 10 is provided with a gas inlet 11, a liquid inlet 12 and a material outlet 13; Brine supply device 8. The blowing tower 2 comprises a tower body 21, the outer top of the tower body 21 is provided with a liquid inlet 22, the top of the inner chamber of the tower body 21 is provided with a feed liquid spraying device 23 communicated with the liquid inlet 22, and the upper part of the tower body 21 is provided with a drain Air port 24, liquid outlet 25 is provided at the bottom of tower body 21, and air inlet 26 is provided at the lower part of tower body 21 side, and partition plate 27 is arranged in tow...

Embodiment 2

[0026] The bromine extraction method comprises the following steps:

[0027] (1) Acidify the brine to a pH value of 3, then send it into the gas-liquid mixer through the brine supply device 8, and simultaneously pass the chlorine gas through the chlorine gas delivery device 7 according to the amount of 1.02 moles of chlorine gas per mole of bromide ion in the brine. Into the gas and liquid mixer 1 to react with acidified brine at normal temperature to oxidize bromide ions into free bromine, thereby producing oxidized brine;

[0028] (2) After the oxidized brine flows out of the gas-liquid mixer 1, it flows into the feed liquid spray device 23 from the liquid inlet 22 of the blowing tower 2 and sprays downward, forming a liquid film on the surface of the filler 29, and at the same time passing through the blower 5 The air is blown into the blowing tower 2 from the air inlet 26 of the blowing tower 2, the speed of the fan is controlled and the spray volume of the material-liquid...

Embodiment 3

[0032] The bromine extraction method comprises the following steps:

[0033] (1) Acidify the brine to a pH value of 3.5, then send it into the gas-liquid mixer through the brine supply device 8, and simultaneously pass the chlorine gas through the chlorine gas delivery device 7 according to the amount of 1.25 moles of chlorine gas per mole of bromide ion in the brine. Into the gas and liquid mixer 1 to react with acidified brine at normal temperature to oxidize bromide ions into free bromine, thereby producing oxidized brine;

[0034](2) After the oxidized brine flows out of the gas-liquid mixer 1, it flows into the feed liquid spray device 23 from the liquid inlet 22 of the blowing tower 2 and sprays downward, forming a liquid film on the surface of the filler 29, and at the same time passing through the blower 5 Air is blown into the blowing tower 2 from the air inlet 26 of the blowing tower 2, the speed of the fan is controlled and the spray volume of the material-liquid sp...

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Abstract

The invention discloses a method for extracting bromine from brine. The method comprises the following steps: (1) introducing chlorine gas into acidified brine and reacting to prepare oxidized brine; (2) downwards spraying the oxidized brine from the top of a stripping tower, simultaneously blowing air up through a fan from the lower part of the stripping tower so that the air comes into full contact with the oxidized brine to resolve free bromine and the free bromine is diffused into the air, and stripping the bromine-containing air from the upper part of the stripping tower; (3) feeding the bromine-containing air into an absorption tower, spraying by a spraying solution, then forming an absorption solution containing hydrobromic acid and enabling the absorption solution to flow out of the bottom of the absorption tower; and (4) feeding the absorption solution into a distillation tower, introducing the chlorine gas to react with hydrobromic acid in the absorption solution to generate hydrogen chloride and the free bromine, wherein the hydrogen chloride generates hydrochloric acid when meeting water and hydrochloric acid is discharged from the bottom of the distillation tower, the free bromine is evaporated to form bromine vapor, and the bromine vapor is cooled to become a final bromine product. The method has the advantages of simplicity and easiness in operation of process steps and high extraction rate of bromine.

Description

technical field [0001] The invention relates to a method for extracting bromine in brine. Background technique [0002] Bromine is a resource-dependent product and an important chemical raw material. It is widely used in high-efficiency flame retardants, refrigerants, petroleum finishing fluids, pharmaceuticals, fuel intermediates, and chemical reagents. At present, there are several methods for extracting bromine from brine: steam distillation, air blowing (acid absorption method, lye absorption method), resin adsorption method, extraction method and precipitation method. However, at present, bromine resources are exploited in a large and disorderly manner, resulting in a rapid decline in the grade of brine, and a rapid decline in bromine production capacity. The bromine industry is in a critical stage in which technology and products urgently need to be upgraded. In order to solve a series of key technical problems in the sustainable development of underground brine resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09
CPCC01B7/096
Inventor 孙跃明邢晓华孟烨
Owner 新疆罗能化工科技有限公司
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