What is commercial preparation of sodium hydroxide by diaphragm cell

The commercial preparation of sodium hydroxide by diaphragm cell is a process of manufacturing sodium hydroxide which is a strong chemical compound. The process involves an electrolytic cell which contains two electrodes submerged in an alkaline solution. On one electrode, hydrogen gas bubbles are released and at the other one oxygen-containing water vapour bubbles are released.

The commercial preparation of sodium hydroxide by diaphragm cell is used because it offers many important benefits over other methods, including reduced energy consumption and no release of toxic waste gases into the environment. It also provides for more efficient production rates, has low environmental impact, and ensures high quality product consistency. The following are some of the process involved;

1. Diaphragm Cell

In order to create an electrochemical cell that is charged with an alkaline solution, two electrodes are immersed in an alkaline solution. The two electrodes are connected together by way of a porous diaphragm. The two electrodes are immersed into the alkaline solution and connected to a power supply. The basic structure of the cell consists of the electrolytic cell and diaphragm.

2. Electrolytic Cell

This type of cell is made from glass, stainless steel and rubber materials due to its high durability and corrosion resistance features. It has a porous diaphragm that prevents electrolyte from leaking through it during charging or discharging. The diaphragm is used to separate the anode and the cathode.

The electrolytic cell is made from glass and stainless steel material due to its durability, corrosion resistance properties and other properties. The porous diaphragm, which separates the anode from the cathode during charging, is made from a special kind of rubber called nitrile rubber. This type of rubber has high durability, it prevents leaking of electrolyte through it during charging or discharging process that helps in production of high quality sodium hydroxide.

3. Charging the cell

The two electrodes are immersed in an alkaline solution for charging. In this process, each electrode produces a different gas during the charging. One electrode produces oxygen-containing water vapour and the other one produces hydrogen gas. The two gases are mixed together and are used to produce liquid sodium hydroxide without any harmful waste product produced by other methods of manufacturing sodium hydroxide. The alkaline solution is continuously pumped into the cell while gas produced by each electrode is released at equal pressure through the porous diaphragm in the electrolytic cell.

4. Discharging the cell

The two electrodes are immersed in the liquid sodium hydroxide. Here, the anode electrode produces oxygen gas, and the cathode electrode produces hydrogen gas. The positive and negative ions are created at each electrode due to the electrolysis of water molecules. This is how sodium hydroxide is produced from water molecules with no toxic waste product released into the environment.

Uses of sodium hydroxide

1. As a cleaning agent and to remove grease

Sodium hydroxide is used as a cleaning agent to remove grease. The compound is weakly acidic which means that it is corrosive to most metals except those of the alkali metals. Its reaction with water depends on the concentration of NaOH. It dissolves in hot water and forms sodium cations and hydroxide anions.

2. As a descaling agent

It is used in manufacturing paper, as well as in processing some other materials because it dissolves calcium, magnesium and aluminum salts that are discharged from pulp mills into rivers and lakes.

3. As a food preservative and in making baking powders

It is used in food production as a preserving agent. Sodium hydroxide absorbs moisture from the air leading to expansion of the material inside the package which is absorbed with moisture thus keeping the product fresh for longer period of time. It can also be used to make baking powders, dishwashing washing powder, toothpaste, mouthwash, burn ointments and medicines.

4. Purification of groundwater

It is used to purify groundwater that has been contaminated by sulfur, nitrogen and other molds. Sodium hydroxide is added to water to neutralize its acidic properties. As the water is heated, a reaction takes place between the sodium hydroxide and oxygen in the water. This results in a solution of sodium carbonate which can then be treated with chlorine gas to make chlorine dioxide which is used as a disinfectant and deodorant for swimming pools, whirlpool baths and hot tubs etc.

In conclusion, the commercial preparation of sodium hydroxide by diaphragm cell process involves an electrolytic cell with two electrodes submerged in an alkaline solution. On one electrode, hydrogen gas bubbles are released and at the other one oxygen-containing water vapour bubbles are released. The two gases are mixed together and the alkaline solution is continuously pumped into the cells while gas produced by each electrode is released at equal pressure through the porous diaphragm in the electrolytic cell.