Industrial chemistry involves the development and optimization of various industrial chemical processes, with a focus on the fundamental chemistry of the processes. Mechanical engineering applies the principles of physics and materials science to the design of mechanical systems. This branch of engineering draws heavily on mechanics, kinematics, thermodynamics, materials science, and structural analysis.
Chemical Engineering can be considered the marriage of industrial chemistry and mechanical engineering, and more. As a discipline, chemical engineering draws on transport phenomena (momentum, mass and heat transfer), reaction kinetics, and thermodynamics as the basis for developing various unit operations. These unit operations include fluid flow, heat transfer, mass transfer, thermodynamic, and mechanical processes, as well as combination and separation processes and chemical reactions. These unit operations are the basis for the design of petroleum refineries and a wide variety of chemical processing plants.