The present disclosure relates to a method for low-temperature depolymerization of a polymer containing a urethane-functional group using a cosolvent and a method for producing polyol. More specifically, the present disclosure relates to a method of adding a compound having two or more alcohol-functional groups as a depolymerization solvent for decomposing a polymer containing a urethane-functional group, adding an aromatic compound having an alkoxy-functional group as a cosolvent to construct a reaction system for decomposing the polymer containing the urethane-functional group, thereby performing rapid depolymerization at a low temperature, and obtaining high-quality recycled polyol in high yield through a physical separation process of the reaction product generated therefrom.

Processes for recovering dialkyl terephthalates. The processes can include exposing a feedstock composition that includes one or more tetramethylcyclobutanediol (TMCD)-containing polyesters ethylene glycol, methanol, or both under depolymerization conditions thereby providing one or more depolymerization products. The one or more depolymerization products can be exposed to an alcoholysis process to recover dialkyl terephthalate.