Welcome to the Qinsun Instruments Co., LTD! Set to the home page | Collect this site
The service hotline

Search


Related Articles

Product Photo

Contact Us

Qinsun Instruments Co., LTD!
Address:NO.258 Banting Road., Jiuting Town, Songjiang District, Shanghai
Tel:021-67801892
Phone:13671843966
E-mail:info@standard-groups.com
Web:http://www.qinsun-lab.com

Your location: Home > Related Articles > The content and specific application of sodium hydroxide!

The content and specific application of sodium hydroxide!

Author:QINSUN Released in:2023-04 Click:102

Invention and Specific Implementation of Sodium Hydroxide!

1. Background Technology

Sodium hydroxide strong>, its chemical formula is NaOH, commonly known as caustic soda, caustic soda and caustic soda. Alkaline solution is also deliquescent and it is easy to absorb water vapor (liquefaction) and carbon dioxide (deterioration) in the air. can add hydrochloric acid to check if it has deteriorated.

In the prior art, the industrial production method of sodium hydroxide is mainly electrolytic saturation Salt water is the main type, mainly used in the chlor-alkali industry in the past.

But at the same time, due to the electrolysis of saturated refined salt water, the cathode chamber produces Hydroxide ions will gradually accumulate on the cation exchange membrane on the side of the cathode chamber. With the continuous increase of the concentration of hydroxide ions there, it is possible to pass through the cation exchange membrane, which will cause chlorine gas in the anode chamber The sharp drop in production and so on.

Second, content of the invention<

The object of the present invention is to provide a preparation which helps to increase the concentration of sodium hydroxide Sodium hydroxide method.

The above object of the present invention is achieved by the followingtechnical scheme: method for preparing hydrogen The method for sodium oxide includes the following steps,

1. Add the refined saturated sodium chloride solution to the preheater for preheating. The preheating temperature is 47°C~63°C;

2. Transfer the preheated saturated sodium chloride solution to the electrolyte in the anode chamber of the tank, the cathode chamber is fed with distilled water and the power is turned on. When the current of the circuit reaches 5.3KA, acid is added to the anode chamber and kept the pH value of the cathode chamber at 2~3;< /p>

3. Increase the temperature of the electrolytic tank to 62°C~73°C, and keep warm and electrify Reaction;

4. Run an air experform traction treatment on the cathode chamber and the anode chamber, and keep the cathode The pressure of chamber and anode chamber is 47.35 X 103Pa~53.41X103Pa;

5. Place the cathode Part of the sodium hydroxide solution produced at the side of the chamber flows back into the cathode chamber, hydrogen gas is produced above the electrode in the cathode chamber, and chlorine gas is produced above the electrode in the anode chamber.

Using the above method, the refined saturated sodium chloride is first preheated so that the saturated sodium chloride can be electrolyzed quickly after it reaches the entered the electrolytic cell, improving the efficiency of electrolysis.

Second, by adding acid to the anode chamber, you raise the pH of the solution, somecan effectively prevent the low amount of hydroxide produced in the cathode chamber from passing through the cation exchange membrane, and the absorption of chlorine gas in the anode chamber, not only reducing the production rate of chlorine gas, but also introducing new substances.

Since the saturated vapor pressure of water at 70°C is 31.18 x 13 Pa, adjust the pressure of the electrolyzer to 47.35 x 13 Pa ~ 53.41 x 13 Pa, which can effectively improve the separation of hydrogen and chlorine from the solution. Thus, the efficiency that comes out helps to improve the normal output of hydrogen and chlorine, and can also reducing the amount of chlorine gas that redissolves in the saturated sodium chloride solution, and also helps to increase the amount of sodium hydroxide output.

By returning part of the sodium hydroxide producedfeed to the cathode chamber, it can increase the concentration of sodium hydroxide, the size of the concentration can be controlled by the return current, and when the concentration of sodium hydroxide in the cathode chamber is increased, the conductivity of the entire electrolytic cell is also improved, which is beneficial to increase the production of sodium hydroxide.

Preferentially, part of the hydrogen produced by S5 passes along the surface of the cation exchange membrane in the cathode chamber.

Preferably, the amount of hydrogen passing through the cathode chamber is 30% of the total amount of hydrogen produced %~40%.

In this way hydrogen gas is passed along the surface of the cation in the cathode chamber exchange membrane, the can effectively cause turbulence in the solution on the surface of the cation exchange membrane and the solution in other parts of the cathode chamber, reducing the accumulation of hydroxide on the surface of the cation exchange membrane and further reducing the penetration of hydroxide Ability of cation exchange membranes.

Preferably, in S3, the stirring paddle is opened in the cathode chamber to stir , and the stirring paddle. The rotating speed is 60~70 rpm.

As hydrogen ions are generated, they will attach to the cathode in the form of bubbles, so a layer of gas film will be formed on the surface of the cathode, reducing the contact area between the cathode and the alkaline solution of the solution, decreasing the conductivity of the alkaline solution, which is not conducive to the production ofsodium hydroxide. Through stirring, the flow rate of sodium hydroxide in the cathode chamber can be effectively increased, so that hydrogen gas can no longer adhere to the cathode, and the efficiency of hydrogen gas generation can be improved.

The rotational speed of 60~70 rpm can reduce the hydrogen and oxygen in the cathode chamber. flow rate of the sodium chloride solution should not be too large, affecting the cation exchange membrane.

Preferably the reflux of sodium hydroxide solution is 1% of the total output / 5~ 3/5.

Preferably in S3, the rudder paddle is engaged in the anode chamber for moving, and the moving paddle The rotating speed is 40~45 rpm.

Stir the saturated natrium chloride solution in the anode chamber, mainly to reduce chlorine gas. the anode and a rotation speed of 40 ~ 45 revolutions per minute can guarantee that chlorine gas bubbles are normally separated from the anode, and can also prevent chlorine gas bubbles from rupturing themselves and being dissolved back into the saturated sodium chloride solution.

Preferably the added acid in S2 is hydrochloric acid.

Hydrochloric acid can not only effectively increase the concentration of hydrogen ions in the anode chamber, but also no new ion concentration should be introduced to avoid the influence of other impurities on the purity of chlorine gas and the conductivity of saturated sodium chloride solution.

In summary, the present invention has the following beneficial effects:

1. By reducing the pressure in the electrolyzer, it can effectively reduce the concentration of hydrogen and chlorine above the solution, which is beneficial to the production of hydrogen and chlorine, and in turn is conducive to increasing the production of sodium hydroxide;

2. Stirring eliminates the adhesion of hydrogen and chlorine to the electrodes, which greatly improves the conductivity of the entire electrolytic cell, which in turn is conducive to improving the production of hydrogen Sodium oxide.

3. Adding hydrochloric acid can not only control the pH of the solution in the anode chamber, but also prevent the introduction of new impurity elements.

Third, specific implementation

Add the refined saturated sodium chloride solution to the preheater, and the preheating temperature is 47 ℃~63 ℃; The saturated sodium chloride solution is transferred into the electrolyzer anode chamber after preheating, join the electrolyzer cathode chamber with the flow of 300 m3/h during, and turn on the power supply, when the electric current of the circuit reaches 5.3KA, add hydrochloric acid to the anode chamber and keep the pH value of cathode chamber 2~3; The temperature of the electrolyzer is raised to 62 ℃~73 ℃, and carry out the heat preservation electrification reaction, meanwhile the stirring speed of the cathode chamber is 60~70 rpm, and the stirring speed of the anode chamber is 40~45 rpm ; The cathode chamber and the anode chamber are performed as a pumping process and keep the cathode chamber andthe pressure of the anode chamber is 47.35 * 103Pa ~ 53.41 * 103Pa; Output hydrogen above the electrode of the cathode chamber, output chlorine above the electrode of the anode chamber, collect in the hydrogen tank and chlorine tank, respectively, and generate the hydrogen obtained by the side of the cathode chamber 1/5 of the sodium oxide solution is returned to the cathode chamber and 30 % of the total amount of hydrogen generated above the cathode chamber is returned to the cathode chamber. The final amount of sodium hydroxide produced is 100 m3/hr, the mass concentration is 34%, and the production rate of sodium hydroxide is 97.5%.

Prev:

Next: