Renewable and recyclable thermoset polymers from non-edible biomass. Conventional thermoset polymers are based on petroleum feedstocks and are non-recyclable. SperoSet produces fully recyclable thermoset polymers that are based on non-edible biomass. Because of SperoSet's chemically reversible bonds, it is degradable in organic or aqueous solutions under mild conditions, recyclable with original thermal and mechanical properties, and repairable and weldable through chemical bond exchange reactions. Reversible bonds eliminate the need for metal catalysts or extra monomers in recycling. Speroset can be used to manufacture plastics produced from fiber-reinforced polymers, which have applications in several industries. Speroset is produced using the biophenols from SPERLU™. SPERLU, which stands for Selective Process for Efficient Removal of Lignin and Upgrading, selectively breaks down and purifies lignin to create sustainable feedstocks for several applications. The process converts lignin from non-food biomass to biophenols. Over 70 million tons of lignin are burned annually in the paper pulp and biofuel industries.