Abstract: Repolyols can be quickly produced by combining fragments of a polyurethane product which with a reagent which is an organic acid or an anhydride of the organic acid or a mixture thereof to form a reaction mixture, and heating the reaction mixture to a reaction temperature greater than a melting point of the reagent for a reaction time of no greater than two hours. The organic acid comprises two carboxylic acid groups linked to each other through a linking group having two or three carbon atoms in the linking chain. The anhydride can include a 5 or 6 member cyclic structure with the group —C(O)—O—C(O)—.