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[Chemical Knowledge]：Production and manufacturing method and process flow of flake alkali

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The manufacturing method
of flake caustic soda
1. Introduction

flake caustic soda, also known as sodium hydroxide or caustic soda, is an important inorganic chemical raw material, widely used in chemical industry, light industry, textile, printing and dyeing, medicine, metallurgy, food and other fields. Because of its wide application, it is of great significance to study the manufacturing method of flake alkali for improving production efficiency, reducing cost and improving product quality. This paper will introduce the manufacturing methods of flake caustic soda in detail, including brine method, diaphragm method and ion exchange membrane method.

2. brine method

brine method is one of the main methods of producing flake caustic soda, its process mainly includes brine refining, electrolysis, evaporation, solid alkali firing and other steps. The specific steps are as follows:

1. Brine refining: the original salt is dissolved, and the refined salt water is prepared by filtering, settling, ion exchange and other treatments.
2. electrolysis: the refined salt water is passed into the electrolytic cell, and the direct current is passed into the electrolytic cell to generate sodium hydroxide, chlorine and hydrogen.
3. Evaporation: The electrolyte is evaporated and concentrated to obtain concentrated lye.
4. solid alkali firing: the concentrated alkali liquid is cooled and crystallized to obtain flake alkali product. The advantages of

brine method are mature process, simple operation, but high energy consumption, and need to deal with a large amount of chlorine and hydrogen.

3. diaphragm method

diaphragm method is another method for the production of flake caustic soda, the process is similar to the brine method, but the use of a diaphragm in the electrolysis process, so that sodium hydroxide and chlorine are generated in different compartments, avoiding the mixing of the two. The specific steps are as follows:
1
brine refining: the same brine method.
2. electrolysis: the refined salt water is passed into the electrolytic cell with diaphragm, and the direct current is passed into the electrolytic cell to generate sodium hydroxide and chlorine. Due to the action of the diaphragm, sodium hydroxide and chlorine are generated in separate compartments, avoiding mixing.
3. evaporation and solid alkali firing: the same brine method. The advantages of the

diaphragm method are that the energy consumption is low, the mixing of chlorine and hydrogen can be avoided, and the safety is improved. However, the diaphragm needs to be replaced periodically, increasing the production cost.

4. ion exchange membrane method

ion exchange membrane method is a new type of platelet alkali manufacturing method, its process is similar to the diaphragm method, but the use of ion exchange membrane in the electrolysis process, so that sodium ions and hydroxide ions can be selectively transmitted through the ion exchange groups on the membrane, so as to achieve the production of high purity sodium hydroxide. The specific steps are as follows:
1
brine refining: the same brine method.
2. electrolysis: the refined salt water is passed into the electrolytic cell equipped with ion exchange membrane, and the direct current is passed for electrolysis. During the electrolysis process, sodium ions and hydroxide ions are selectively transported through the ion exchange membrane to generate high-purity sodium hydroxide and chlorine.
3. evaporation and solid alkali firing: the same brine method. The advantages of

ion exchange membrane method are high product purity, low energy consumption and simple operation, which is a more advanced method for the manufacture of caustic soda. However, the ion exchange membrane is expensive and needs to be replaced periodically, which increases the production cost.

5. Conclusion The main manufacturing methods of

caustic soda tablets are brine method, membrane method and ion exchange membrane method. Different methods have their own advantages and disadvantages, and the appropriate production method should be selected according to the actual situation. In the future, with the continuous progress and application of science and technology, the manufacturing method of caustic soda will continue to be improved and optimized, improve production efficiency, reduce costs, improve product quality, and make greater contributions to the development of chemical production raw materials.

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