Chemical engineering is the branch of engineering that deals with the application of physical science (e.g., chemistry and physics), and life sciences (e.g., biology, microbiology and biochemistry) with mathematics and economics, to the process of converting raw materials or chemicals into more useful or valuable forms. Chemical Engineering deals with the application of physical sciences, life sciences and mathematics to the process of converting raw materials into more useful forms, such as the production of soap from sodium hydroxide. Chemical engineers are required in pharmaceuticals, textiles, paper, plastics, petroleum and food industry etc.

In addition to producing useful materials, modern chemical engineering is also concerned with pioneering valuable new materials and techniques – such as nanotechnology, fuel cells and biomedical engineering. Chemical Engineering are chemical process Principles, inorganic and physical chemistry, organic chemistry, fluid and particle mechanics, chemical engineering, thermodynamics, process dynamics and control, economics and management of chemical industries, biochemical engineering.

Chemical engineering largely involves the design, improvement and maintenance of processes involving chemical or biological transformations for large-scale manufacture. Chemical engineers ensure the processes are operated safely, sustainably and economically. Chemical engineers in this branch are usually employed under the title of process engineer. A related term with a wider definition is chemical technology. A person employed in this field is called a chemical engineer.