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Method for removing chlorate in electrolytic circulation light salt brine

A technology for light salt water and chlorate, applied in the field of removing chlorate in electrolytic circulating light salt water, can solve the problems such as the decomposing efficiency of the decomposer needs to be further improved, the solid reaction of sodium metabisulfite is violently exothermic, and the hidden danger of production safety, etc. Low unit decomposition efficiency, high efficiency and rapid reduction of chlorate concentration level, the effect of reducing production and transportation costs

Inactive Publication Date: 2020-06-19
鄂尔多斯市瀚博科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned prior art, formaldehyde is used as the decomposition agent in CN107881527A, and the general industrial formaldehyde concentration is 37%, so it needs about 1kg of decomposition agent to decompose 1kg unit sodium chlorate; 30-55% concentration range of chemicals, remove part of chlorate through the reaction of aldehyde chemicals in the front stage, and remove the remaining part of chlorate with sodium sulfite salt chemicals in the second stage, but the two-stage and multi-stage decomposition requires multiple large decomposition tanks, Though effect is better, industrial popularization is difficult, and the decomposition efficiency of unit decomposer also needs to be further improved; CN104860335A and CN106011928A adopt sodium pyrosulfite solution or sodium pyrosulfite solid to decompose chlorate, though inorganic sodium pyrosulfite decomposition efficiency is higher, but sodium pyrosulfite The solubility is only 54g / 100ml water (20°C), so about 5kg of saturated sodium metabisulfite solution is needed to decompose 1kg unit sodium chlorate
However, the solid reaction of sodium pyrosulfite is exothermic violently, which is easy to cause hidden dangers in production safety, and is not suitable for popularization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The outlet part of the electrolyzer is 20m 3 Circulating light brine at 20m 3 The flow rate of / h is drained to the chlorate decomposition tank body, the light brine contains chlorate 10g / L (calculated as sodium chlorate), and the temperature is 83°C. Add 40kg mass fraction in the chlorate decomposition tank body. 98% acetaldehyde decomposes chlorate into sodium chloride, appropriately adds dilute hydrochloric acid to adjust the pH of light brine to 3, and reacts for 2 hours. At this time, the reaction exothermic reaction temperature is 93 ° C. The salt content is 3.9g / L) is drained to the dechlorination tank for subsequent dechlorination treatment and primary and secondary brine refining, and the refined brine returns to the electrolytic cell for circulation.

[0050] 20m 3 Chlorate in light brine is reduced from 10g / L to 3.9g / L, promptly decomposes sodium chlorate 122kg, needs 98% acetaldehyde 40kg.

Embodiment 2

[0052] The outlet part of the electrolyzer is 20m 3 Circulating light brine at 20m 3 The flow rate of / h is drained to the chlorate decomposition tank body, the light brine contains chlorate 8g / L (in terms of sodium chlorate), and the temperature is 83°C. Add 20kg mass fraction in the chlorate decomposition tank body. 98% acetaldehyde decomposes chlorate into sodium chloride, appropriately adds dilute hydrochloric acid to adjust the pH of light brine to 0, and reacts for 3.5 hours. At this time, the reaction exothermic reaction temperature is 88° C. Salt content of 4.0g / L) is drained to the dechlorination tank for subsequent dechlorination treatment and primary and secondary brine refining, and the refined brine returns to the electrolytic cell for circulation.

[0053] 20m 3 Chlorate is reduced from 8g / L to 4.0g / L in light brine, promptly decomposes sodium chlorate 80kg, needs 98% acetaldehyde 20kg.

Embodiment 3

[0055] The outlet part of the electrolyzer is 20m 3 Circulating light brine at 20m 3 The flow rate of / h is drained to the chlorate decomposition tank body, the light brine contains chlorate 12g / L (calculated as sodium chlorate), and the temperature is 83°C. Add 75kg mass fraction in the chlorate decomposition tank body. 99% acetaldehyde decomposes chlorate into sodium chloride, appropriately adds dilute hydrochloric acid to adjust the pH of light brine to 5, and reacts for 1.5h. At this time, the exothermic reaction temperature of the reaction is 98°C. Salt content of 4.5g / L) is drained to the dechlorination tank for subsequent dechlorination treatment and primary and secondary brine refining, and the refined brine returns to the electrolytic cell for circulation.

[0056] 20m 3 Chlorate in light brine is reduced from 10g / L to 4.5g / L, promptly decomposes sodium chlorate 150kg, needs 99% acetaldehyde 75kg.

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Abstract

The invention relates to the technical field of water treatment, particularly to a method for removing chlorate in electrolytic circulating light salt brine. The method comprises the following step: adding acetaldehyde into electrolytic circulating light salt brine without adding sulfite. The process provided by the invention has the advantages of high decomposition efficiency, low consumption andsimple process.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing chlorate in electrolytic circulating light brine. Background technique [0002] In industry, NaOH and Cl are produced by electrolysis of saturated NaCl solution. 2 and H 2 , and use them as raw materials to produce a series of chemical products, which is called the chlor-alkali industry. The chlor-alkali industry mainly uses two production processes: diaphragm method and ion membrane exchange method. The main products of the chlor-alkali industry include caustic soda, polyvinyl chloride (PVC), chlorine, hydrogen, etc. Chlor-alkali products are mainly used in the manufacture of organic chemicals, paper, soap, glass, chemical fibers, plastics and other fields. [0003] At present, in the chlor-alkali industry, most of the caustic soda is produced by the electrolysis of salt water by ion membrane exchange, which has the advantages of small equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B15/08
CPCC25B1/46C25B15/08
Inventor 韦超广赵长森颜艺专牛强
Owner 鄂尔多斯市瀚博科技有限公司
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