Chemical engineering combines mathematics with physical science and is mainly involved in designing and maintaining chemical processes at a constant rate in large-scale industries. Useful products are formed from raw materials. An important part of research and development involved in chemical engineering is to find new and better materials and techniques.

Chemical industry is involved in the manufacture of organic and inorganic chemicals. Petrochemicals and agrochemicals are another sector, which involves the products obtained from petrol and chemicals used for agriculture such as fertilizers, pesticides, herbicides, etc. Chemical engineering is a vast branch, which includes environmental technology, which studies about the good and bad effects of certain chemicals on the environment. It also deals with the study on proper disposal of wastewater, gases, etc.

   Unit processes such as filtration, distillation, sedimentation, etc. are studied by chemical engineers, which help them separate useful chemicals from the waste. Chemical engineers also study the energy involved in the reactions taking place in various processes and calculate the heat that requires be supplying or removing in order to facilitate proper function. The main laws behind chemical engineering, conservation of mass, energy and momentum, are used to study mass, heat and momentum transfer reactions.

    Chemical engineers are now engaged in developing and producing a wide range of products and specialty chemicals. Chemical engineering is used to design environment friendly fabrics, plastics, adhesives, glass, paint, fertilizers, shampoo, soaps, etc. Cosmetics and medicinal branches also make use of various branches of chemical engineering.