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Electrolytic synthesis method of high sodium sulfate

A technology of high sodium sulfate and electrolytic synthesis, applied in the direction of electrolytic components, electrolytic process, etc., can solve the problems of reduced effective content, long process route, and many equipments, and achieve easy control of crystallization conditions, overcome long preparation route, and improve process route Effect

Pending Publication Date: 2022-01-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. Chemical method: 1) The overall production cost is higher than that of electrolytic method; 2) Harmful gases are easily diffused into the air, causing damage to the environment
[0011] 2. Indirect electrolysis method: 1) The process route is too long and requires more equipment; 2) High ammonium sulfate reacts with sodium hydroxide to produce a large amount of ammonia gas, and the production environment is not very friendly; 3) High sodium sulfate during the reaction process Excessive decomposition, resulting in reduced effective content

Method used

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  • Electrolytic synthesis method of high sodium sulfate
  • Electrolytic synthesis method of high sodium sulfate
  • Electrolytic synthesis method of high sodium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] An open box-type electrolyzer made of polymer material is used, and a porous ceramic diaphragm is fixed in the middle of the open box-type electrolyzer, and the electrolyzer is separated into an anode tank 10 and a cathode tank 11, and an anode tank 10 and a cathode tank 11 The acid-resistant silicone tubes are respectively connected to the jacketed liquid storage tanks. The electrolyte in the anode storage tank and the cathode storage tank is respectively added into the anode tank 10 and the cathode tank 11 through a peristaltic pump, and the electrolyte in the anode tank 10 and the cathode tank 11 passes through the effect of height difference on the other side of the electrolytic tank. One nozzle flows back into the liquid storage tank, and the anode and the cathode are respectively fixed at both ends of the porous ceramic diaphragm with a distance of 0.2 cm from the diaphragm 7 .

[0040] The anode used for electrolysis is a boron-doped diamond electrode, the cathod...

Embodiment 2

[0043] The electrolysis device and the crystallization device used in the experiment are the same as in Example 1.

[0044] The anode used for electrolysis is a boron-doped diamond electrode, the cathode is a stainless steel 304 electrode, the diaphragm 7 is a microporous diaphragm, and the acid electrolyte of sodium sulfate in the anode tank 10 is prepared, wherein the concentration of sodium sulfate is 2.7mol / L, and the concentration of sulfuric acid is 2.4mol / L, and the anode current density is set to 300mA / cm 2 , the cathode tank 11 is 0.2mol / L sodium sulfate and 2.0mol / L sulfuric acid. The prepared electrolyte was introduced into the open box-type electrolytic cell, the circulation flow rate was 200ml / min, the electrolysis temperature was 40°C, and the electrolysis was circulated for 15 minutes to reach the set temperature before the start of electrolysis.

[0045] After the electrolysis is completed, sodium sulfate is separated in an environment of 5°C, and the treated ...

Embodiment 3

[0047] The electrolysis device and the crystallization device used in the experiment are the same as in Example 1.

[0048] The anode used for electrolysis is a platinum electrode, the cathode is a G-30 Hastelloy electrode, the diaphragm 7 is a porous ceramic diaphragm, and the acidic electrolyte of the anode tank 10 sodium sulfate is prepared, wherein the concentration of sodium sulfate is 2.7mol / L, and the concentration of sulfuric acid is 2.7mol / L. The concentration is 2.4mol / L, urea and sodium thiocyanate are used as oxygen evolution inhibitors, the concentrations are 0.2g / L and 0.6g / L respectively, and the anode current density is set to 800mA / cm 2 , the cathode cell 11 is 0.5mol / L sodium sulfate and 2.5mol / L sulfuric acid. The prepared electrolyte was introduced into the open box-type electrolytic cell, the circulation flow rate was 200ml / min, the electrolysis temperature was 35°C, and the electrolysis was circulated for 15 minutes before the start of electrolysis to rea...

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Abstract

The invention discloses an electrolytic synthesis method of high sodium sulfate, the method comprises the following steps: an electrolysis device is installed, and acid solutions of sodium sulfate with different concentrations are prepared and used as catholyte and anolyte respectively; the electrolyte is subjected to circulation and temperature control electrolysis through a high-speed peristaltic pump; after electrolysis is completed, redundant sodium sulfate is separated out in a low-temperature environment, after separation is completed, vacuum concentration, cooling crystallization, centrifugal separation and drying are carried out, a high-sodium-sulfate product is obtained, the concentration of sodium sulfate in the anolyte is 2.4-2.8 mol / L, and the concentration of sulfuric acid in the anolyte is 2.2-3.0 mol / L; the concentration of sodium sulfate in the catholyte composition is 0.2-0.8 mol / L, the concentration of sulfuric acid in the catholyte composition is 2.0-3.0 mol / L, the temperature of temperature control electrolysis is controlled to be 30-40 DEG C, and the current density of electrolysis is controlled to be 300-1000 mA / cm < 2 >. The method for synthesizing the high sodium sulfate through direct electrolysis is adopted, the process route is improved and optimized, the problem that a traditional method for producing the high sodium sulfate is long in preparation route is solved, production energy consumption can be effectively reduced, and product decomposition is reduced at low temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of sodium persulfate, and in particular relates to an electrolytic synthesis method of sodium persulfate. Background technique [0002] Sodium persulfate, the molecular formula is Na 2 S 2 o 8 , is a strong oxidant, highly corrosive, and has a very high solubility in water. High sodium sulfate is an important chemical raw material. It is widely used in chemical industry, light industry, environment, food, petroleum and semiconductor manufacturing and other industrial fields. Its market scale is increasing year by year. The use of high sodium sulfate can be roughly divided into into the following categories: [0003] 1) It can be used as a restoration agent to degrade perfluorinated compounds, polycyclic aromatic hydrocarbons and organochlorine pesticides in soil in environmental governance; [0004] 2) It can be used as a metal treatment agent to clean and etch printed circuits in...

Claims

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Application Information

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IPC IPC(8): C25B1/29C25B1/50
CPCC25B1/29C25B1/50
Inventor 毛信表钱超杰俞霜婷陈赵扬
Owner ZHEJIANG UNIV OF TECH