This lecture introduces the fundamentals of separation processes, a crucial aspect of chemical engineering. The instructor discusses the importance of molecular separations in industrial applications, emphasizing the need for effective separation techniques in various chemical processes. Key concepts such as energy separating agents and mass separating agents are explained, along with their roles in designing separation processes. The lecture covers essential topics including mass and energy balances, phase equilibria, and different separation methods like distillation, extraction, and adsorption. The instructor highlights the significance of understanding these processes for optimizing industrial operations and reducing energy consumption. Additionally, the course structure, evaluation methods, and resources available for students are outlined. The lecture aims to provide students with a solid foundation in separation processes, preparing them for practical applications in the chemical industry. By the end of the session, students are expected to grasp the relevance of separation techniques and their impact on efficiency and sustainability in chemical engineering.