This encyclopaedia provides a comprehensive and analytical treatment of chemical separations, integrating fundamental principles with advanced techniques and industrial applications. It explains the physicochemical basis of separation processes, including equilibrium behaviour, reaction dynamics, molecular interactions, and stability considerations. The discussion connects theoretical chemistry with process engineering, demonstrating how separation strategies are designed, optimised, and evaluated within complex production systems. Attention is given to reaction mechanisms, kinetics, solution chemistry, and photochemical behaviour that influence selectivity and efficiency in industrial operations. The encyclopaedia also addresses applications across polymers, petroleum systems, environmental treatment, and biochemical processes, illustrating the broad relevance of separation science in modern chemical industries. By combining molecular theory with process simulation and design perspectives, it offers a structured framework for understanding how chemical separations contribute to product purity, safety, sustainability, and technological innovation in contemporary manufacturing and research environments.

It is intended for postgraduate students, researchers, and professionals in chemistry and chemical engineering. The encyclopaedia serves as an authoritative academic reference and practical guide, supporting advanced study, industrial analysis, and informed application of separation principles across diverse chemical, environmental, and biomedical contexts worldwide today.