“Just as the arts of tanning and dyeing were practiced long before the scientific principles upon which they depend were known, so also the practice of Chemical Engineering preceded any analysis or exposition of the principles upon which such practice is based”. ~William H. Walker “Chemical engineering is the profession in which a knowledge of mathematics, chemistry and other natural sciences gained by study, experience and practice is applied with judgment to develop economic ways of using materials and energy for the benefit of mankind”. ~AIChE Chemical Engineering is a branch of engineering that applies physical sciences (physics and chemistry), life sciences (microbiology and biochemistry), together with applied mathematics and economics to produce, transform, transport, and properly use chemicals, materials and energy. A chemical engineer designs large-scale processes that convert chemicals, raw materials, living cells, microorganisms and energy into useful forms and products.Chemical engineers are involved in many aspects of plant design and operations, including safety and hazard assessments, process designs and analysis, control engineering, chemical reaction engineering, construction specification and operating instructions. Chemical engineering contains manufacturing paints, plastics, fuels, medicines, fibers, fertilizers, papers, semiconductors and others. A chemical engineer carries out the chemical experiments, resulting purification and cleaning technology for protecting the environment. Modern chemical engineering is also concerned with pioneering valuable new materials and techniques, such as nanotechnology, fuel cells and biomedical engineering.