Differential equations-used in most science and engineering analysis- are particularly important in modeling chemical engineering systems. As the physical and chemical laws governing these processes (heat, mass, and momentum transfer) are complex, as well as the chemical reactions, reaction heat, adsorption, desorption, phase transition, multiphase flow, etc,associated with them, so also are the differential models arising from them and include:, homogeneous/ non-homogeneous, linear/non-linear , constant/variable coefficients, 1st, 2nd or higher orders, and systems of simultaneous differential equationsboth for Ordinary and partial differential equations.