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Method for removing trace iodine from salt water for producing sodium hydroxide by electrolysis method

An electrolysis method and brine technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of cumbersome operation, high cost, and limitations, and achieve the effects of simple process, small investment, and low operating cost

Active Publication Date: 2012-10-17
昊华宇航化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method requires a diaphragm caustic soda device, which has limitations; the second method is expensive and cumbersome to operate, and currently no manufacturer has adopted it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for removing trace amounts of iodine in brine used for electrolytic production of caustic soda, the method is: under stirring conditions, use hydrochloric acid to adjust the pH of brine to 2 to obtain solution a, and add sodium sulfite to solution a (the amount of sodium sulfite added is solution a 0.3wt%), and then use a compressor at 50 ℃ to air in 1m 3 / min speed into the solution a bubbling 1h, iodine content in brine from 0.6mg / l before treatment to 0.05mg / l.

[0017] The iodine content was analyzed using the Water Iodine Rapid Quantitative Detection Kit (produced by Wuhan Zhongsheng Biochemical Technology Co., Ltd.), the same below.

Embodiment 2

[0019] A method for removing trace amounts of iodine in brine used for electrolytic production of caustic soda, the method is: under stirring conditions, use hydrochloric acid to adjust the pH of brine to 4 to obtain solution a, and add ferrous chloride to solution a (ferrous chloride The amount of iron added is 0.5wt% of solution a), and then at 60 ° C, use a compressor to blow nitrogen at 3m 3 / min speed into the solution a bubbling 1.5h, the iodine content in the brine decreased from 0.5mg / l before treatment to 0.08mg / l.

Embodiment 3

[0021] A method for removing trace amounts of iodine in brine used for electrolytic production of caustic soda, the method is: under stirring conditions, use hydrochloric acid to adjust the pH of brine to 6 to obtain solution a, and add a mixture b of ferrous chloride and ferrous sulfate solution a (the amount of b added is 1wt% of solution a), and then at 80°C, use a compressor to blow carbon dioxide at 10m 3 / min speed into the solution a bubbling 2h, iodine content in brine from 1mg / l before treatment to 0.06mg / l.

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PUM

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Abstract

The invention relates to a method for removing trace iodine from salt water for producing sodium hydroxide by an electrolysis method. The method comprises the following steps of: adjusting the pH value of the salt water to be 2 to 6 with hydrochloric acid to obtain solution a under the stirring condition; and adding an iodine ion reducing agent into the solution a and introducing gas into the solution a for bubbling at the temperature of between 50 and 80 DEG C, wherein the amount of the added iodine ion reducing agent is 0.3 to 1 weight percent of the solution a; and the iodine ion reducing agent is one or more of sodium sulfite, ferrous chloride and ferrous sulfate. The method has the advantages of reducing the iodine content of the salt water from 0.2mg / l to be below 0.1mg / l, along with simple process, low operating cost, safety, reliability, high economic benefit and the like, and is particularly suitable for removing the trace iodine from the salt water during ionic membrane caustic soda production.

Description

technical field [0001] The invention relates to a method for removing trace amounts of iodine in brine, in particular, it is suitable for removing trace amounts of iodine in brine in an ion membrane alkali production process. Background technique [0002] Caustic soda is an important basic chemical raw material. At present, the production of caustic soda by brine electrolysis is mainly divided into two types: diaphragm method and ionic membrane method. The ionic membrane alkali production process has been recognized as a new directional chlor-alkali production process. Because of its advantages of low comprehensive energy consumption, high concentration of liquid alkali, high purity of hydrogen chloride, and basically no pollution, it has been widely used Most chlor-alkali manufacturers adopt, especially new projects, basically all adopt the ion-exchange membrane alkali-making process. The electrolytic cell and ion exchange membrane account for a large proportion of the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14C25B1/46C25B15/08
Inventor 毛晓军王松波许文静屈凌波王志勇刘娟肖咏梅焦高成何丽君
Owner 昊华宇航化工有限责任公司