Method for extracting bromine from brine
A brine and hydrophobic technology, applied in the field of bromine extraction, can solve the problems of temperature influence and high energy consumption, and achieve the effect of improving efficiency and reducing energy consumption
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Embodiment 1
[0015] Take the hollow fiber membrane module with polypropylene microporous membrane inside, the membrane area is 1m 2 (Inner diameter meter), inner diameter 0.36mm, membrane pore diameter 0.05μm, adding kerosene to soak for 24 hours, polypropylene hollow fiber microporous membrane becomes transparent. 1m 3 The brine with a bromide ion concentration of 201.23 mg / L was passed into 100 g of chlorine gas to oxidize bromine ions as free bromine, and the free bromine concentration in the brine was measured to be 183.11 mg / L. Add hydrochloric acid to adjust the pH to 3.5, and then take a sodium formate solution with a concentration of 28g / L. Both 2L of sodium formate solution and 3L of acidified and oxidized brine will circulate through the outside and inside of the hollow fiber membrane at a speed of 20L / h. The solution absorbed the bromine in the brine. After 25 minutes, the bromine concentration in the brine was measured to be 17.42 mg / L, and the debromination rate reached 90.48%. ...
Embodiment 2
[0017] Take the hollow fiber membrane module with polypropylene microporous membrane inside, the membrane area is 1m 2 (Inner diameter meter), inner diameter 0.36mm, membrane pore diameter 0.05μm, adding kerosene to soak for 24 hours, polypropylene hollow fiber microporous membrane becomes transparent. 1m 3 Brine with a bromide ion concentration of 344.43mg / L was passed into 170g of chlorine to oxidize bromine ions as free bromine, and hydrochloric acid was added to adjust the pH to 3.5. The free bromine concentration in the brine was measured to be 311.41mg / L. Take 2L of sodium hydroxide solution with a concentration of 40g / L and 3L of brine after acidification and oxidation, and circulate them through the outer and inner sides of the hollow fiber membranes respectively. The flow rate of sodium hydroxide solution is 20L / h, the flow rate of brine is 60L / h, 25 Minutes later, the bromine concentration in the brine was 11.09mg / L, and the debromination rate reached 96.44%.
Embodiment 3
[0019] Take the hollow fiber membrane module with the polyvinylidene fluoride microporous membrane inside, the membrane area is 0.25m 2 (Inner diameter meter), the inner diameter is 1.1mm, the membrane pore diameter is 0.05μm, and kerosene is added to soak for 24 hours, the polyvinylidene fluoride hollow fiber microporous membrane becomes transparent. 1m 3 Brine with a bromide ion concentration of 223.51 mg / L was passed into chlorine gas and 110 g of oxidized bromine ions were free bromine. Hydrochloric acid was added to adjust the pH to 3.0. The free bromine concentration in the brine was measured to be 198.63 mg / L. Then take 2L of sodium hydroxide solution with a concentration of 40g / L and 2L of acidified and oxidized brine, and circulate them through the outer and inner sides of the hollow fiber membranes respectively. The sodium hydroxide solution flow rate is 10L / h, and the brine flow rate is 20L / h. After 30 minutes, the free bromine concentration in the brine was measured ...
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