A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.
该方法包括形成反应混合物,其中包括苯二
甲酸聚酯、含有2至5个碳原子的
甘醇和酰胺催化剂;并将反应混合物加热至约120°C或更高的温度,以降解苯二
甲酸聚酯,从而形成苯二
甲酸酯反应产物,其中包括单体二羟基苯二
甲酸酯;其中,苯二
甲酸酯反应产物中含有苯二
甲酸酯寡聚物的数量少于通过i)用等摩尔量的
胍催化剂替代酰胺催化剂和ii)在其他条件相同的情况下降解苯二
甲酸聚酯所产生的苯二
甲酸酯寡聚物的数量。