Chemical engineering or chemical engineering is a branch of engineering in which a raw material is transformed into a fine material by a special method by combining mathematics with physics (e.g. chemistry or physics). The field of chemical engineering has become much wider and wider in the modern world , even though the field of work of chemical engineers is mainly differentiation or component analysis , design of different units of petroleum refining and chemical plants and high quality products at low cost by preventing energy wastage . Chemical engineers are conducting extensive research on nanotechnology , process control , biochemical and biomedical , semiconductor and display science , ecology , polymer science , pharmaceutical industry , textile industry , nuclear science , renewable energy, etc.