This book systematically discusses the fundamental, principle and method of pulping and reaction process intensification, recovery of value-added products from black liquor waste in the paper industry. The book chapters are authored by leading experts who bring together years of innovative research in black liquor waste management describing the latest developments in pulping process from different sources of raw materials, properties and recovery technologies of black liquor, extraction of value-added chemicals and clean hydrogen through industrial waste management. The book effectively bridges the gap between academic research and industrial applications through the systematic introduction of the basic principles of recovery technologies leading up to industrial case studies. It also demonstrates the circular economy growth of the pulping industry and environment sustainability through waste management. This book aims to be a reference guide for researchers and engineers in related fields to jointly promote the energy conservation, emission reduction and green development of process industry.