Di(2 ethylhexyl) phthalate (DOP) was prepared from phthalic anhydride and 2 ethylhexanol via niobium pentoxide catalyzed esterification.

• 用固体酸五氧化二铌作酯化催化剂，由苯酐和2-乙基己醇制备了邻苯二甲酸二（2-乙基己酯）（DOP）。