Chemicalindustry (chemicalindustry), chemicalengineering (chemicalengineering), chemicaltechnology (chemical process) are referred to as chemicalindustry. The chemical industry includes petrochemicals, agrochemicals, pharmaceuticals, polymers, paints and oleochemicals. They appear in different historical periods, have different meanings, but are closely related, permeate each other, have continuity, and are endowed with new content in their development process. Early human life depended more on the direct use of natural substances. Gradually the inherent properties of the material to meet the needs of mankind, and produced a variety of processing technology, consciously purposefully transform natural substances for the new material that has a variety of performance, and gradually put into practice on the scale of industrial production. Broadly, all using chemical methods change the composition or structure, or synthesis of new materials, belong to chemical production technology, chemical technology, the product obtained is called chemicals or chemical products.