This module focused on fundamental principles and mechanisms of polymerization, alkylation and industrial polymerization practices in chemical process industries. It involves the industrial important polymerizations and polymers, different types of catalyst used in polymerization reactions and types of alkylating agents in alkylation reaction. Moreover, it provides the knowledge on the preparations, properties and uses of phenolic, urea, melamine and alkyd resins and also the principles of alkylation to produce alkyl aryl detergents in technical works.