Industrial waste streams such as plastics, lignocellulosic biomass, spent solvents, process off-gases, and wastewaterposeconsiderable environmental challenges while simultaneously offering substantial potential as alternative feedstocksforsustainable chemical production. This review evaluates recent progress in green and sustainable technologies aimedattransforming these heterogeneous waste materials into valuable resources, including fuels, platformchemicals, advancedmaterials, and clean energy carriers. Key conversion pathways examined include catalytic and chemical recyclingthroughpyrolysis and upcycling, hydrothermal liquefaction of wet biomass, gasification followed by syngas upgrading viaFischer–Tropsch and related processes, anaerobic digestion with biogas enhancement, carbon dioxide valorization, solvent recoverysystems, membrane-based separations, and integrated biorefinery frameworks. Current evidence demonstrates encouraginglaboratory and pilot-scale results, highlighting the viability of several waste valorization technologies within circular economymodels. However, significant limitations persist, particularly regarding variable feedstock composition, highenergyandoperational demands, economic constraints, and regulatory complexities that hinder large-scale industrial implementation. Thereview emphasizes the need for hybrid process integration, advanced pre-treatment and sorting techniques, catalyticprocessintensification, and comprehensive life-cycle assessment to enhance environmental performance and economic feasibility. Overall,the study underscores that sustainable green technologies can play a pivotal role in transforming industrial waste intovaluableresources while supporting long-term ecological and industrial sustainability. Keywords: Green technologies, Chemical industries, Chemical recycling, Solvent recovery, Pyrolysis