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Processing method for extracting bromine from brine by composite blowing and absorbing method

A process method and brine technology, applied in the direction of bromine/hydrogen bromide, chlorine/hydrogen chloride, etc., can solve the problems of bromine production capacity decline, brine grade decline, etc., and achieve the effect of improving extraction rate, reducing chlorine consumption, and high blowing rate

Active Publication Date: 2014-12-24
SHANDONG TIANYI CHEM
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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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  • Processing method for extracting bromine from brine by composite blowing and absorbing method

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Experimental program
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Effect test

Embodiment 1

[0024] 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, the bottom of tower body 21 is provided with liquid outlet 25, and tower body 21 side lower part is provided with air inlet 26, and tower body 21 is provided with dividing ...

Embodiment 2

[0027] The bromine extraction method comprises the following steps:

[0028] (1) Acidify the brine to a pH value of 3, then send it into the gas-liquid mixer 1 through the brine supply device 8, and at the same time pass chlorine gas into the gas-liquid mixer 1 through the chlorine gas delivery device 7 and mix with the acidified brine at room temperature Carry out reaction, bromine ion is oxidized to free bromine, thereby makes oxidized brine, oxidized brine flows out from the material outlet 13 of gas-liquid mixer 1; The redox potential detected by reduction potentiometer 19 is stable at about 975mv;

[0029] (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 ...

Embodiment 3

[0033] The bromine extraction method comprises the following steps:

[0034] (1) Acidify the brine to a pH value of 3.5, then send it into the gas-liquid mixer 1 through the brine supply device 8, and at the same time pass chlorine gas into the gas-liquid mixer 1 through the chlorine gas delivery device 7 and mix with the acidified brine at room temperature Carry out reaction, bromine ion is oxidized to free bromine, thereby makes oxidized brine, oxidized brine flows out from the material outlet 13 of gas-liquid mixer 1; The redox potential detected by reduction potentiometer 19 is stable at about 982mv;

[0035] (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,...

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Abstract

The invention discloses a processing method for extracting bromine from brine by a composite blowing and absorbing method, and the method comprises the following steps of: (1) accessing chlorine into acidized brine, and preparing into oxidized brine after reaction; (2) downward spraying oxidized brine from a stripping tower top, upwardly blowing from the bottom of the stripping tower to its top by a fan to allow air to be fully contacted with oxidized brine so as to analyze free bromine diffused into air, and blowing bromine-containing air from the stripping tower top; (3) conveying bromine-containing air into an absorbing tower, spraying it with spraying liquid to form absorption liquid containing hydrobromic acid, and discharging the absorption liquid from the absorbing tower; (4) conveying absorbing liquid into a distillation tower, accessing chlorine to react with hydrobromic acid in absorbing liquid so as to generate chlorine hydride and free bromine, reacting chlorine hydride into hydrochloric acid in a wet condition, discharging hydrochloric acid from the distillation tower bottom, evaporating free bromine to form bromine steam, and cooling the bromine steam to prepare into bromine. The method is simple in steps and high in bromine extraction rate.

Description

technical field [0001] The invention relates to a process method for extracting bromine in brine by multiple blowing and sucking. 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 sustainabl...

Claims

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Application Information

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IPC IPC(8): C01B7/09C01B7/01
Inventor 孙跃明邢晓华孟烨
Owner SHANDONG TIANYI CHEM
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