Electrochemistry method for simultaneously producing sodium chlorate and alkaline peroxide

A technology of hydrogen peroxide and sodium chlorate, which is applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of increasing operating costs, achieve the effect of reducing operating costs, reducing production costs, and improving overall utilization efficiency

Inactive Publication Date: 2009-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of cation exchange membranes, it is necessary to add an equivalent chemical equivalent of sodium hydroxide to the anolyte during the electrolysis process to adjust the pH of the anolyte to 6-7, which increases the operating cost

Method used

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  • Electrochemistry method for simultaneously producing sodium chlorate and alkaline peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] use as figure 1 Shown is the experimental setup for the electrochemical process to prepare alkaline hydrogen peroxide and sodium chlorate. The specific test conditions are as follows: the cathode material is carbon black / polytetrafluoroethylene coated composite graphite particles, the nickel cathode plate (80*70mm), the anode is a titanium-coated lead dioxide DSA electrode (80*70mm), and the apparent area of ​​the electrode is 30cm 2 , the anion exchange membrane is a polyethylene heterogeneous membrane, and the cation exchange membrane is a polyethylene heterogeneous membrane. The anolyte is 3.8M NaCl, and the residence time in the anode chamber is 21s; the catholyte is 2M NaOH, and the residence time is 7min; The concentration is 1M, and the residence time is 100s. The temperature of the anolyte in the electrolytic cell is 30°C and that of the catholyte is 35°C. The current density is 1.2kA / m 2 , the average terminal voltage is 4.3V. The temperature of the heati...

Embodiment 2

[0027] use as figure 1 Shown is the experimental setup for the electrochemical process to prepare alkaline hydrogen peroxide and sodium chlorate. The specific test conditions are as follows: the cathode material is carbon black / polytetrafluoroethylene coated composite graphite particles, the stainless steel cathode plate (80*70mm), the anode is a titanium-coated lead dioxide DSA electrode (80*70mm), and the apparent area of ​​the electrode is 30cm 2 , the anion exchange membrane is a polysulfone heterogeneous membrane, and the cation exchange membrane is a perfluorosulfonic acid membrane. Anolyte is 2.8M NaCl and 2.42M NaClO 3 , the residence time in the anode chamber is 8s; the catholyte is 2M NaOH, and the residence time is 84s; The time is 10s. The temperature of the anolyte in the electrolytic cell is 30°C and that of the catholyte is 35°C. The current density is 1.2kA / m 2, the average terminal voltage is 4.1V. The temperature of the heating reaction tank is 70° C.,...

Embodiment 3

[0029] use as figure 1 Shown is the experimental setup for the electrochemical process to prepare alkaline hydrogen peroxide and sodium chlorate. The specific test conditions are as follows: the cathode material is carbon felt, the stainless steel cathode plate (80*70mm), the anode is a titanium-coated ruthenium Ru / Ti electrode (80*70mm), and the apparent area of ​​the electrode is 30cm 2 , the anion exchange membrane is a polysulfone heterogeneous membrane, and the cation exchange membrane is a perfluorosulfonic acid membrane. Anolyte is 3.8M NaCl and 0.25M NaClO 3 , the first residence time in the anode chamber is 42s; the catholyte is 4M NaOH, the residence time is 42s, the air is passed into the cathode chamber after the alkali washing bottle and the water washing bottle, and the residence time is 0.2s; the NaOH solution concentration in the middle chamber is 2M, The dwell time is 5s. The temperature of the anolyte in the electrolytic cell is 50°C, and that of the catho...

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Abstract

The invention relates to an electrochemical method which produces sodium chloride and alkaline hydrogen peroxide simultaneously. The method can improve the use efficiency of the two poles of the electricity, and lower the production cost. The method adopts an electrolytic tank consisting of an anode, a cation exchange membrane, an anion exchange membrane and a cathode, wherein, the electrodes combine with the membranes in sequence to form an anode chamber, an intermediate chamber and a cathode chamber; sodium chloride solution and sodium chlorate solution are circulated to the anode chamber, sodium hydroxide solution and air is circulated to the cathode chamber and sodium hydroxide solution is circulated to the intermediate chamber; after direct current circulating among the electrodes, chlorine is produced in the anode while the oxygen in the cathode deoxidizes and produces hydrogen peroxide and the concentration of the sodium hydroxide solution in the intermediate chamber is increased; the anolyte flowing out of the anode chamber flows into an external heated reaction tank, and chlorine is transferred into sodium chlorate; the anolyte is circulated back to the anode chamber of the electrolytic tank; a part of the concentrated sodium hydroxide solution which flows out of the intermediate chamber can be used for adjusting the pH value of the anolyte without using extra sodium hydroxide, thereby lowering the running cost.

Description

technical field [0001] The invention relates to an electrochemical method for simultaneously producing sodium chlorate and alkaline hydrogen peroxide, belonging to the field of chemical production. Background technique [0002] The technology of separately preparing sodium chlorate or alkaline hydrogen peroxide by electrochemical method is relatively mature. For example, the conventional chlorate production method described in "Electrolytic production of sodium chloride" by J. Coleman (A.I.Ch.E. Symposium 204 vol 77 1981. pp244-263). Sodium chlorate is produced by electrolyzing a sodium chloride solution in a single-chamber electrolyzer, producing chlorine gas at the anode and hydrogen gas and hydroxide ions at the cathode. Chlorine gas is hydrolyzed to generate hypochlorous acid, which further undergoes a homogeneous chemical reaction in an independent heated reaction tank to generate chlorate. The electrochemical method to produce sodium chlorate generally uses a saturat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14C25B1/26C25B1/30C25B9/00
Inventor 申哲民雷阳明王文华仝岩张鉴达
Owner SHANGHAI JIAO TONG UNIV
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