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Ultrahigh-pressure sodium hypochlorite generator and preparation method of sodium chlorate

A sodium hypochlorite generator technology, applied in the field of water treatment, can solve the problems of personal injury, chlorine gas leakage, poor sealing, etc., and achieve the effect of increasing placement density, reducing arrangement spacing, and avoiding leakage

Pending Publication Date: 2021-01-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of producing sodium hypochlorite by electrolysis, a large amount of chlorine gas and hydrogen gas will be produced. Electrolyzers and tubular electrolyzers usually use gas flow pipes to pour chlorine gas into the generator, which has poor sealing and is prone to chlorine gas leakage, causing pollution and personnel Possibility of injury, while chlorine and hydrogen accumulate in the reactor for a long time and there is a risk of explosion

Method used

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  • Ultrahigh-pressure sodium hypochlorite generator and preparation method of sodium chlorate

Examples

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Effect test

Embodiment 1

[0054] Ruthenium oxide coated titanium anode ultra-high pressure sodium hypochlorite generator to produce sodium hypochlorite:

[0055] a, the cathode pressing plate 8 is a stainless steel cathode pressing plate, and the anode plate 9 is a titanium anode plate coated with ruthenium oxide;

[0056] b. Use a brine pump to inject 3.5% mass concentration of salt water from the water inlet 12 at a flow rate of 0.1m / s, and the fluid passes through the channels around the central hole of the cathode pressure plate 8 to form a return flow;

[0057] c. Adjust the applied electric field voltage to 5.0V and the current density to 10mA / cm 2 ;

[0058] d. After running stably for 1 hour, take a sample from the water outlet 11 to detect the concentration index of available chlorine in the sodium hypochlorite solution.

[0059] The available chlorine concentration of the effluent sodium hypochlorite solution is 10g / L.

Embodiment 2

[0061] Lead oxide coated titanium anode ultra-high pressure sodium hypochlorite generator to produce sodium hypochlorite:

[0062] a. The cathode plate 8 is a stainless steel cathode plate, and the anode plate 9 is a lead oxide-coated titanium anode plate;

[0063] b. Use a salt water pump to pump salt water with a mass concentration of 5% from the water inlet 12 at a flow rate of 0.2m / s, and the fluid passes through the channels around the central hole of the cathode pressure plate 8 to form a return flow;

[0064] c. Adjust the applied electric field voltage to 6.0V and the current density to 20mA / cm 2 ;

[0065] d. After running stably for 1 hour, take a sample from the water outlet 11 to detect the concentration index of available chlorine in the sodium hypochlorite solution.

[0066] The available chlorine concentration of the effluent sodium hypochlorite solution is 15g / L.

Embodiment 3

[0068] Antimony-tin oxide coated titanium anode ultra-high pressure sodium hypochlorite generator to produce sodium hypochlorite:

[0069] a. The cathode plate 8 is a stainless steel cathode plate, and the anode plate 9 is an antimony-tin oxide-coated titanium anode plate;

[0070] b. Use a salt water pump to inject 3.5% mass concentration of salt water from the water inlet 12 at a flow rate of 0.3 m / s, and the fluid passes through the channels around the central hole of the cathode pressure plate 8 to form a return flow;

[0071] c. Adjust the applied electric field voltage to 5.0V and the current density to 10mA / cm 2 ;

[0072] d. After running stably for 1 hour, take a sample from the water outlet 11 to detect the concentration index of available chlorine in the sodium hypochlorite solution.

[0073] The available chlorine concentration of the effluent sodium hypochlorite solution is 10g / L.

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Abstract

Disclosed are an ultrahigh-pressure sodium hypochlorite generator and a preparation method of sodium chlorate. The ultrahigh-pressure sodium hypochlorite generator comprises a shell with a water inletand a water outlet, a plurality of cathode pressing plates and a plurality of anode plates which are sequentially stacked at intervals are arranged in the shell, and the cathode pressing plates and the anode plates are provided with center holes. A center shaft penetrates through the center holes to position and press the cathode pressing plates and the anode plates to form a disc type structureand block the cathode pressing plates and the anode plates at the positions of the center holes. Strong brine enters from the water inlet, sequentially flows back between the cathode pressing plates and the anode plates to form a passage and flows out from the water outlet. The reaction mass transfer efficiency and the reaction path are increased by utilizing the disc type design, and the reactionefficiency of sodium hypochlorite production is improved; the electrodes adopt a cathode and anode staggered lamination mode, so that the reaction efficiency is enhanced; and the reactor shell and the internal electrodes adopt a high-pressure sealing mode, so that the dissolution rate of chlorine can be effectively improved, and chlorine leakage is avoided. The method has good sodium hypochloriteproduction capacity, and can significantly improve the concentration of sodium hypochlorite in water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an ultra-high pressure sodium hypochlorite generator and a preparation method of sodium chlorate. Background technique [0002] Sodium hypochlorite disinfection technology is a conventional and efficient disinfection technology for drinking water and industrial wastewater, and has a broad application market. The preparation of sodium hypochlorite by electrolysis is the most widely used online sodium hypochlorite production technology. Through electrolysis, sodium hypochlorite can be directly prepared from salt solution. The specific reaction is as follows: [0003] 2NaCl+2H 2 O→2NaOH+Cl 2 +H 2 [0004] Chlorine produced (Cl 2 ) will react with the generated sodium hydroxide solution (NaOH) to generate sodium hypochlorite solution (NaClO): [0005] Cl 2 +2NaOH→NaCl+NaClO+H 2 o [0006] However, the existing electrolytic sodium hypochlorite generators are mainly ta...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B9/17C25B11/02C25B9/60
CPCC25B1/26
Inventor 朱云庆马宏瑞牛军峰
Owner SHAANXI UNIV OF SCI & TECH
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