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[Chemical Knowledge]：Chloride production and manufacturing methods and processes.

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In the field of raw materials for chemical production, there are various methods for the production of chlorides, depending on the type of chloride desired and the specific production conditions. This article will detail several common chloride manufacturing methods.

1. the production
of hydrogen chloride
hydrogen chloride is an important inorganic chloride, widely used in chemical, pharmaceutical, food and other industries. The production of hydrogen chloride is mainly achieved by the absorption reaction of hydrochloric acid and alkali. The specific steps are as follows:

1. hydrochloric acid is mixed with lye (such as sodium hydroxide or potassium hydroxide), and a neutralization reaction occurs to generate hydrogen chloride and water.
2. Mixing hydrogen chloride gas with water vapor through an absorption tower to form a mixture of hydrochloric acid and water.
3. Use concentrated sulfuric acid to dry the hydrogen chloride gas to remove the moisture therein.
4. Finally, the dry hydrogen chloride gas is compressed and cooled to make liquid hydrogen chloride.

2. the production of vinyl chloride

vinyl chloride is an important organic chloride, mainly used in the production of polyvinyl chloride (PVC). The production methods of vinyl chloride are mainly the following:

1. Acetylene method: acetylene and hydrogen chloride react in the presence of a catalyst to generate vinyl chloride.
2. Ethylene method: ethylene and chlorine are reacted in the presence of a catalyst to produce dichloroethane. Then, the dichloroethane is thermally cracked to produce vinyl chloride and hydrogen chloride.

3. aluminum trichloride production

aluminum trichloride is an inorganic chloride, used as a catalyst, desiccant, etc. The production method of aluminum trichloride is as follows:

1. The metal aluminum reacts with chlorine at a certain temperature to generate aluminum trichloride.
2. Purification of aluminum trichloride by distillation to remove impurities therein.

4. calcium chloride production

calcium chloride is an inorganic chloride, widely used in desiccant, refrigerant and other fields. The production method of calcium chloride is as follows:

1. Limestone reacts with hydrochloric acid to generate calcium chloride and carbon dioxide.
2. Through filtration, evaporation, crystallization and other processes, pure calcium chloride is prepared.

The above lists only some common chloride manufacturing methods. In fact, there are many other manufacturing methods according to different chlorides and production conditions. In the production process of chloride, it is necessary to consider the cost of raw materials, energy consumption, environmental protection and other factors, and select the appropriate manufacturing method. In addition, with the continuous development of science and technology, the manufacturing method of chloride is also constantly improved and optimized. Improving production efficiency, reducing energy consumption and reducing environmental pollution have become important development trends in chloride manufacturing.

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