发布日期：2022-01-08
Chemical industry is a knowledge and capital intensive industry. With the development of science and technology, it has gradually developed into a multi industry and multi variety production department from a few inorganic products such as soda ash and sulfuric acid and organic products mainly made of Alizarin extracted from plants.
A large number of chemical enterprises with comprehensive utilization of resources and large scale have emerged. Including basic chemical industry and plastics, synthetic fiber, petroleum, rubber, pharmaceutical, dye industry, etc. It is a department that uses chemical reactions to change the structure, composition and morphology of substances to produce chemical products. Such as inorganic acid, alkali, salt, rare element, synthetic fiber, plastic, synthetic rubber, dye, paint, chemical fertilizer, pesticide, etc.
Chemical industry is a multi variety basic industry. In order to meet the various needs of chemical production, there are many types of chemical equipment and the operating conditions of the equipment are also complex. According to the operating pressure, there are vacuum, atmospheric pressure, low pressure, medium pressure, high pressure and ultra-high pressure: according to the operating temperature.
Low temperature, normal temperature, medium temperature and high temperature; Most of the treated media are corrosive, or flammable, explosive, toxic, highly toxic, etc. Sometimes for a specific equipment, there are both temperature and pressure requirements and corrosion resistance requirements, and these requirements sometimes restrict each other, and sometimes some conditions often change.
