Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for extracting bromine from brine

A brine and hydrophobic technology, applied in the field of bromine extraction, can solve problems such as high energy consumption and temperature influence, and achieve the effect of reducing energy consumption and improving efficiency

Active Publication Date: 2010-11-10
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of high energy consumption and serious temperature influence in the prior art bromine extraction method, the present invention provides a new bromine extraction method, which utilizes the affinity of non-polar organic solvents and hydrophobic microporous membranes to form The organic solvent liquid membrane supported by the hydrophobic microporous membrane, with the help of the dissolving ability of the organic solvent for bromine and the diffusion of bromine in the organic solvent, through the non-dispersive contact of the bromine-containing brine and the absorption liquid flowing independently on both sides of the liquid membrane And the same level of transfer, the bromine in the brine is absorbed by the alkaline absorption liquid, the efficiency of the bromine extraction process is improved, and the energy consumption is reduced

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

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, add kerosene and soak for 24 hours, the polypropylene hollow fiber microporous membrane becomes transparent. will be 1m 3 The bromide ion concentration is 201.23mg / L brine pass through 100g chlorine gas oxidation bromide ion is the free bromine, the free bromine concentration in the brine is measured to be 183.11mg / L. Add hydrochloric acid to adjust the pH value to 3.5, then take a sodium formate solution with a concentration of 28g / L, circulate 2L of sodium formate solution and 3L of acidified and oxidized brine at a speed of 20L / h through the outer and inner sides of the hollow fiber membrane, and the sodium formate The solution absorbed bromine in the brine, and after 25 minutes, the bromine concentration in the brine was measured to be 17.42 mg / L, and the debromination rate reac...

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, add kerosene and soak for 24 hours, the polypropylene hollow fiber microporous membrane becomes transparent. will be 1m 3 The brine with a bromide ion concentration of 344.43 mg / L was passed through 170 g of chlorine gas to oxidize the bromide ions into free bromine, and hydrochloric acid was added to adjust the pH value to 3.5. The free bromine concentration in the brine was measured to be 311.41 mg / L. Take 2L of sodium hydroxide solution with a concentration of 40g / L and 3L of brine after acidification and oxidation, and circulate through the outer and inner sides of the hollow fiber membrane respectively. The flow rate of sodium hydroxide solution is 20L / h, and the flow rate of brine is 60L / h. Minutes later, the bromine concentration in brine was measured to be 11.09mg / L, and the...

Embodiment 3

[0019] Take the hollow fiber membrane module with built-in polyvinylidene fluoride microporous membrane, the membrane area is 0.25m 2 (inner diameter), the inner diameter is 1.1 mm, and the membrane pore diameter is 0.05 μm. After soaking in kerosene for 24 hours, the polyvinylidene fluoride hollow fiber microporous membrane becomes transparent. will be 1m 3 The brine with a bromide ion concentration of 223.51 mg / L was passed through 110 g of chlorine gas to oxidize bromide ions into free bromine, and hydrochloric acid was added to adjust the pH value to 3.0, and 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 brine after acidification and oxidation, and circulate through the outside and inside of the hollow fiber membrane respectively. The flow rate of sodium hydroxide solution is 10L / h, and the flow rate of brine is 20L / h. After 30 minutes, the concentration of free...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for extracting bromine from brine. In the method, the affinity of a non-polar solvent and a hydrophobic microporous membrane is utilized and a microporous membrane supported organic solvent liquid membrane is formed; and the brine-containing free bromide and absorption solution flow on two sides of the liquid membrane respectively, and the free bromide is absorbed by the alkaline absorption solution through the liquid membrane by means of the solubility and diffusivity of the free bromide in the organic solvent so as to separate the bromine enriched in the brine. The method comprises the technical steps of organic liquid membrane preparation, brine acidification, and bromine separation and extraction, wherein the hydrophobic microporous membrane is immersed in the non-polar solvent to prepare the organic liquid membrane; the acidified brine which is filled with chloride and the alkaline absorption solution flow on the two sides of the organic liquid membrane respectively; in the organic liquid membrane preparation step, the organic solvent is kerosene, carbon tetrachloride and dichloroethane, and the hydrophobic microporous membrane is a microporous membrane of polypropylene, polyvinylidene fluoride and polyethylene; and in the bromine separation and extraction step, the alkaline absorption solution is 28g / L sodium formate or 40g / L sodium hydroxide solution.

Description

technical field [0001] The invention relates to a bromine extraction technology, in particular to a method for extracting bromine in brine using an organic solvent and a liquid film formed by a hydrophobic microporous membrane. Background technique [0002] Bromine is the only liquid non-metallic element at room temperature. It has strong oxidizing properties and is one of the basic chemical raw materials. It is widely used in the synthesis of chemicals such as detergents, flame retardants, refrigerants, water treatment agents, and pharmaceutical intermediates. . Bromine extraction technology is the process of separating bromine in the form of elemental substances, and currently it is mainly extracted from brine. Industrialized bromine extraction technologies are mainly steam distillation and air blowing. The steam distillation method uses water vapor to distill elemental bromine out, and consumes a lot of water vapor. It is generally suitable for high-grade bromine-contai...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09
Inventor 张慧峰刘伟姚颖高书宝王颖张雨山王国强
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI