Bittern bromine-blowing process

Abstract

The invention discloses a bittern bromine-blowing process comprising oxidation, blowout, absorption and distillation. A blowout tower and a mixer are used in the process. The process comprises the steps of selecting bittern of which the bromine content is 1000-2500ppm as a raw material, and adjusting the pH value to 2-3.5 before the bittern raw material is fed into the blowout tower; and performing a bittern oxidation stage and a blowout stage on the bittern, then feeding the bittern into an absorption tower to perform concurrent flow gas liquid contact with absorption completed liquid, and performing absorption operation, wherein the bromine content of the absorption completed liquid is 80-100g / L. The bromine is extracted from the mother solution (bittern) of sea salt production by adopting the oxidation and blowout method, and the blowout tower and the mixer are used in the process, so that the bromine extraction process is scientific, the yield of the bromine is 2.5 times that of a water vapor distillation method, and the power consumption of the process is 60% of that of an intermediate bittern bromine-blowing process. The total extraction rate is over 85%. The process initiates the process equipment parameters of high bromine content, high viscosity and high specific gravity raw material condition, and is used for design and production.

Description

technical field [0001] The invention relates to a bromine extraction technology, in particular to a bittern bromine blowing process, which adopts oxidation and blowing methods to extract bromine from the mother liquor (brine) produced by sea salt, and is also applicable to other bromine-containing ( 1000-2500ppm) raw material to extract bromine. Background technique [0002] Bromine is an important chemical raw material, mainly used in energy, automobiles, medicine, pesticides, dyes, flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, etc. [0003] Bromine is mainly taken from seawater and concentrated seawater (including underground brine). The bromine content of seawater is 65ppm; the bromine content of underground brine in Shandong, China is 200ppm; the dead sea of ​​Israel is 3000-10000ppm; India is 3000-5000ppm; the shallow sea of ​​Ukraine is 600-1000ppm; the deep brine of the United States is 2000-3000ppm. [0004] The world's bromin...

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Problems solved by technology

[0008] At present, the mother liquor of sea salt production - bittern (brine) (2000ppm) is sun-dried and concentrated, and then enters the salt chemical workshop to produce potassium chloride, bromine (steam distillation method), and magnesium chloride. There is about 30%-40% penetration, and the loss of bromine is also caused in the production of potassium chloride. Therefore, when the bromine is extracted from thick halogen by steam distillation, the output is only 40% of that of bittern bromine. That is to say, after adopting the bittern bromine blowing technology, the output is about 2.5 times that of the steam distillation method.

[0009] At present, there is no technical information on bittern bromine blowing in China

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