As a understanding technique, chemical industry has several classification approaches to divide its branches according to various demands in different historical stages. These branches can be divided at the base of raw material source, the nature of the merchandise and method laws and so on. But these classification strategies can not be created use of independently. From the angle of raw materials, chemical market consists of fuel chemical business from the angle of goods, chemical industry includes inorganic chemical market, simple organic chemical industry, polymer chemical business, fine chemical industry, and so on. from the common process laws, the branch of chemical engineering can be contained.
The raw materials of fuel chemical business mainly incorporate such inflammable minerals as petroleum, natural gas, coal and oil shale. For that reason, fuel chemical industry can also be divided into petroleum refining business, petrol-chemical industry, natural gas chemical market, coal chemical business and oil shale chemical market. Amongst them, petroleum refining industry is 1 of the most essential economic lifelines for a country which can create fairly high account of value. As natural gas and petroleum are interdependent, natural gas chemical business generally belongs to petrol-chemical business. Nowadays, petroleum refining industry and petrol-chemical industry are the primary parts of fuel chemical industry. The essential item of petrol-chemical industry is raw supplies for basic organic chemical market. For that reason, petrol-chemical industry is also an crucial component of fundamental organic chemical industry. In addition, petro-chemical industry can also produce composite supplies like plastic, synthetic rubber and synthetic fiber which are also the merchandise of polymer chemical market. As a result, fuel chemical industry, standard organic chemical industry and polymer chemical market are tied together closely. Fine chemical engineering mainly produces chemicals with certain functions in little lots. Although a lot of of its products have been produced on a large scale, they are nonetheless regarded as goods of fine chemical engineering out of habits. The merchandise of fine chemical business primarily contain dyes, agricultural chemicals medicines, dopes, and so on. From the angle of raw supplies, fine chemical industry can be both organic and inorganic. In the new technological revolution of micro electronic approach, biotechnology and new supplies, fine chemical market adds new vitality to chemical industry.