Introduce the core content of chemical industry

Chemical industry is the abbreviation of "chemical process", "chemical industry", "chemical engineering", etc. Any technology that uses chemical methods to change the composition, structure or synthesize new substances belongs to chemical production technology, that is, chemical process. The products obtained are called chemicals or chemical products.

At first, the production of such products was a manual workshop, then evolved into a factory, and gradually formed a specific production industry, namely the chemical industry. Chemical engineering is a science that studies the common law of chemical product production process. The relationship between mankind and chemical industry is very close. Some chemical products play an epoch-making role in the history of human development. Their production and application even represent a certain historical stage of human civilization.

Chemical engineering is divided into chemical thermodynamics, transfer process, unit operation, chemical reaction engineering and chemical system engineering. The first two are the theoretical basis of chemical engineering. Unit operation is the earliest concept of chemical engineering. It decomposes the physical process of chemical production into several units, such as fluid transportation, distillation, extraction, heat exchange, drying and so on.

These unit operations not only play an important role in chemical production, but also are widely used in metallurgy, light industry, food, nuclear industry and other industrial fields with common characteristics with chemical industry. The unit operation is still developing and improving. For example, the particle science developed in the 21st century, as a theory of powder engineering, has been applied to catalyst particle size design, high-temperature gas dust removal, grain drying and transportation.