Chemical industry, chemical engineering, chemical technology are referred to as chemical industry. Chemical industries include petrochemicals, agrochemicals, pharmaceuticals, polymers, painochemicals and oleochemicals. They appear in different historical periods, have different meanings, but are closely related, penetrate, have continuity, and are given new content in their development. The early life of mankind is more dependent on the direct use of natural substances. Gradually, the inherent properties of these substances can not meet the needs of mankind, resulting in a variety of processing technology, consciously purposefully natural material into a variety of properties of new substances, and gradually in the scale of industrial production to achieve. Broadly speaking, where the use of chemical methods to change the composition or structure of the material, or the synthesis of new substances, are chemical production technology, that is, chemical technology, the resulting product is called chemical or chemical products.