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Electrolytic process of mixed liquor of waste diluted hydrochloric acid

A technology of mixed liquid and waste hydrochloric acid, applied in the electrolysis process, electrolysis components and other directions, can solve the problems that have not yet been seen, and achieve the effect of low cell voltage and high current efficiency

Inactive Publication Date: 2012-05-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also many patent documents, research papers, and production practice reports in this area at home and abroad, mainly around reducing cell voltage and improving current efficiency. The concentration of electrolytic hydrochloric acid is generally above 20%, while the electrolytic literature reports of hydrochloric acid with a concentration of less than 15% haven't seen yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Dissolving the refined table salt with dilute hydrochloric acid to saturation to obtain an electrolyte mixed solution, the concentration of HCl in the mixed solution is 1%;

[0014] 2) Heat the mixed liquid to 60°C and pass through the diaphragm or cationic membrane electrolytic cell, with copper mesh as the cathode and titanium alloy as the anode, the cell voltage is controlled at 1.9V, and the current density is controlled at 1000A / m 2 , to obtain chlorine and hydrogen, and the current efficiency (chlorine) is 90-98%;

[0015] 3) The electrolysis adopts a continuous multi-stage method, that is, the mixed solution after the first-level electrolysis is supplemented with refined salt to saturation for the second-level electrolysis, and the mixed solution after the second-level electrolysis is then supplemented with refined salt to saturation for the third-level electrolysis. By analogy, until the pH=3 of the mixed solution;

[0016] 4) After the electrolysis is compl...

Embodiment 2

[0018] 1) Dissolving the refined table salt with dilute hydrochloric acid to saturation to obtain an electrolyte mixed solution, the concentration of HCl in the mixed solution is 8%;

[0019] 2) Heat the mixed solution to 30°C and pass through the diaphragm or cationic membrane electrolytic cell, with copper mesh as the cathode and titanium alloy as the anode, the cell voltage is controlled at 3.2V, and the current density is controlled at 3000A / m 2 , to obtain chlorine and hydrogen, and the current efficiency (chlorine) is 90-98%;

[0020] 3) The electrolysis adopts a continuous multi-stage method, that is, the mixed solution after the first-level electrolysis is supplemented with refined salt to saturation for the second-level electrolysis, and the mixed solution after the second-level electrolysis is then supplemented with refined salt to saturation for the third-level electrolysis. By analogy, until the pH=4 of the mixed solution;

[0021] 4) After the electrolysis is com...

Embodiment 3

[0023] 1) Dissolving the refined table salt with dilute hydrochloric acid to saturation to obtain an electrolyte mixed solution, the concentration of HCl in the mixed solution is 5%;

[0024] 2) Heat the mixed solution to 90°C and pass through the diaphragm or cationic membrane electrolytic cell, with the copper mesh as the cathode and the titanium alloy as the anode, the cell voltage is controlled at 2.5V, and the current density is controlled at 2000A / m 2 , to obtain chlorine and hydrogen, and the current efficiency (chlorine) is 90-98%;

[0025] 3) The electrolysis adopts a continuous multi-stage method, that is, the mixed solution after the first-level electrolysis is supplemented with refined salt to saturation for the second-level electrolysis, and the mixed solution after the second-level electrolysis is then supplemented with refined salt to saturation for the third-level electrolysis. By analogy, until the pH=5 of the mixed solution;

[0026] 4) After the electrolysi...

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PUM

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Abstract

The invention discloses an electrolytic process of mixed liquor of waste diluted hydrochloric acid, comprising: dissolving refined table salt to saturation by the diluted hydrochloric acid to obtain electrolyte mixed liquor; heating the mixed liquor to 30-90 DEG C, causing the heated mixed liquor to pass through a diaphragm or cationic diaphragm electrolytic cell; taking a copper net as a cathodeand a titanium alloy as an anode; controlling the cell voltage to 1.9-3.2V, and controlling the current density to 1000-4000A / m<2> to obtain chlorine and hydrogen; electrolyzing in a continuous multilevel mode, i.e. supplementing the refined table salt into the mixed liquor after I-level electrolysis to saturation, and then carrying out II-level electrolysis; supplementing the refined table salt into the mixed liquor after II-level electrolysis to saturation, and then carrying out III-level electrolysis; by parity of reasoning, finishing the reaction until the pH of the mixed liquor is 3-5; supplementing the refined table salt into the electrolyzed mixed liquor to saturation; and entering the diaphragm or cationic diaphragm electrolytic cell to carry out normal industrial production of chlor-alkali. Compared with the chlor-alkali industry, the invention has low cell voltage for the electrolysis preparation of chlorine and hydrogen and high current efficiency. The invention is one of the most effective methods for recycling waste diluted hydrochloric acid generated by enterprises.

Description

technical field [0001] The present invention relates to a resource recovery method of waste hydrochloric acid, in particular to an enterprise based on the chlor-alkali industry (such as polyvinyl chloride, chlorinated polyethylene, toluene diisocyanate, 4,4-diisocyanodiphenolyl methane , azodicarbonamide, etc.) produced by electrolysis of dilute waste salt mixture. Background technique [0002] The recovery and treatment of dilute waste hydrochloric acid (1% to 15%) produced by enterprises based on the chlor-alkali industry is a worldwide problem. A domestic chlorinated polyethylene enterprise (120,000 tons of CPE / a, its output of dilute waste hydrochloric acid is 750m3 3 / d) The dilute hydrochloric acid produced in the production is treated as acid waste water and discharged after neutralization with alkaline substances (limestone or carbide slag). The required cost is about 7 million yuan (excluding sewage charges), which not only increases the economic burden and a huge...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B1/02C25B15/08
Inventor 孙根行王琴孙安妮黄龙宝
Owner SHAANXI UNIV OF SCI & TECH