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Method for extracting bromine from brine and co-producing high-purity salt

A brine and high-purity technology, applied in the field of salt chemical industry, can solve the problems of low mass transfer efficiency and low absorption rate, and achieve the effects of low energy consumption, increased absorption rate, and increased mass transfer area

Active Publication Date: 2016-11-16
山东夙沙高科生物有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, membrane separation technology has not been applied industrially in the field of salt chemical technology, mainly because of low mass transfer efficiency and low absorption rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. Extract underground brine with a bromide ion content of 134mg / L, adjust the pH value of the brine to 3.0 after filtering, and introduce chlorine gas for reaction. The amount of chlorine gas introduced is 80% of the molar amount of bromide ion in the brine.

[0032] b. Continuously pass the brine of step a through two sets of hydrophobic membrane modules connected in series. The hydrophobic membrane module includes a hydrophobic membrane tube and a membrane shell whose two ends are round and gradually become oblate from the two ends to the middle. The brine passes through the hydrophobic membrane tubes of the two sets of hydrophobic membrane modules in turn, the bromide ion reaction liquid flows through the membrane shells of the two sets of hydrophobic membrane modules in turn, and the reaction liquid first enters the second set of hydrophobic membrane modules and then enters the first set, followed by brine The flow direction is reversed; before the brine enters the sec...

Embodiment 2

[0037] a. Extract underground brine with a bromide ion content of 134mg / L, adjust the pH value of the brine to 3.1 after filtering, and introduce chlorine for reaction. The amount of chlorine introduced is 60% of the molar amount of bromide ion in the brine.

[0038] b. Continuously pass the brine of step a through three sets of hydrophobic membrane modules connected in series. The hydrophobic membrane module includes a hydrophobic membrane tube and a membrane shell whose two ends are round and gradually become oblate from the two ends to the middle. The brine successively passes through the hydrophobic membrane tube of the hydrophobic membrane module, the bromide ion reaction solution and sodium hydroxide solution successively flow through the membrane shell of the hydrophobic membrane module, and the reaction liquid first enters the third group of hydrophobic membrane modules and then enters the second group and the first group. Group, opposite to the brine flow direction; the f...

Embodiment 3

[0043] a. Extract underground brine with a bromide ion content of 134mg / L, adjust the pH value of the brine to 3.0 after filtering, and introduce chlorine gas for reaction. The amount of chlorine gas introduced is 65% of the molar amount of bromide ion in the brine;

[0044] b. Continuously pass the brine of step a through two sets of hydrophobic membrane modules connected in series. The hydrophobic membrane module includes a hydrophobic membrane tube and a membrane shell whose two ends are round and gradually become oblate from the two ends to the middle. The brine successively passes through the hydrophobic membrane tube of the hydrophobic membrane module, the bromide ion reaction solution sodium hydroxide solution flows through the membrane shell of the hydrophobic membrane module in turn, and the reaction liquid first enters the second group of hydrophobic membrane modules and then enters the first group, followed by brine The flow direction is opposite; the flow rate of the r...

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PUM

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Abstract

The invention discloses a method for extracting bromine from brine and co-producing high-purity salt. The method comprises the following steps of (a) adjusting the pH value of the brine to 2.5-3.5, and introducing chlorine gas; (b) enabling the brine to continuously pass through at least two sets of hydrophobic film assemblies which are mutually connected in series, enabling the brine to sequentially pass through hydrophobic film pipes or film shells of the hydrophobic film assemblies, and enabling reaction fluid of bromine ions to sequentially flow through the film shells or the hydrophobic film pipes of the hydrophobic film assemblies; (c) introducing the chlorine gas into the reaction fluid once again, performing heating to 50-80 DEG C, and through at least two sets of microporous film assemblies which are mutually connected in series, enabling reduced bromine to enter the film shells through microporous film pipes to be collected; (d) adding a scale inhibitor to the brine which sequentially flows through the hydrophobic film assemblies, and performing filtration so as to obtain refined brine; and (e) heating the refined brine to 80-100 DEG C, performing concentration through a concentration film assembly, and continuing rectification on feed fluid so as to obtain sodium chloride. The method disclosed by the invention is used for comprehensively utilizing the brine, has the advantages that equipment is simple, pollution is low, and energy consumption is low, and the absorptivity of the bromine is increased.

Description

Technical field [0001] The invention relates to the technical field of salt chemical industry, in particular to a technology of extracting bromine from brine and co-producing salt. Background technique [0002] As an important mineral resource in coastal areas, brine resources play a key role in local economic and social development. From brine, various chemical materials such as bromine, industrial salt, soda ash, and fresh water can be extracted. However, it is the same as other resource minerals. , The negative effects brought about by the disorder and over-exploitation of brine resources have already appeared. It is urgent to develop a comprehensive utilization method of brine to maximize its value. [0003] Bromine is the main branch of the marine chemical industry. Bromine and its derivatives have been widely used in medicine, dyes, pesticides, refrigerants, flame retardants and other fields. At present, the common methods for extracting bromine are mainly air blowing method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01B7/09
CPCC01B7/096C01D3/14
Inventor 王德强王彦玲杨树仁闫雪段升芹王慧
Owner 山东夙沙高科生物有限公司