复合固体超强酸SO_4~(2-)/ZrO_2-TiO_2催化合成邻苯二甲酸二(2-乙基己酯)

以复合固体超强酸SO42-/ZrO2-TiO2为催化剂合成了邻苯二甲酸二(2-乙基)己酯(DOP),考察了催化剂用量、投料比和反应终点温度对反应的影响,用傅立叶变换红外光谱对产品进行了结构表征。结果表明,该工艺优化条件为:催化剂用量为总投料量为0.6%(质量分数),投料比n(苯酐)∶n(2-乙基己醇)为1∶(2.3～2.4),反应终点温度205～215℃,反应时间2.3h,酯化率达99.5%以上,产品质量达到或超过国家优级品标准,催化剂可重复使用5次,酯化率仍在99%以上,无腐蚀,环境污染小,催化剂再生容易。

Synthesis of Di(2-ethyl hexyl) Phthalate Catalyzed by Compound Solid Superacid SO42-/ZrO2-TiO2

Di（2-ethyl hexyl） phthalate （DOP） was synthesized using compound solid superacid SO4^2-/ZrO2-TiO2 as catalyst. The effects of the amount of catalyst SO4^2-/ZrO2-TiO2, the mole ratio of raw material and the final reaction temperature on the reaction were studied. The product＇s structure was analyzed by means of FT IR spectroscopy： The optimum conditions for the synthesis of DOP over SO4^2-/ZrO2-TiO2 are： amount of catalyst, w （catalyst）=0.6 （based on the amount of total reactant）; molar ratio of phthchic anhydride to 2-ethyl hexanol, n （phthchie anhydride）：n （2-ethyl hexanol） = 1：（4.5-5.0）; the final reaction temperature, 205-215 ℃ and reaction time is 2,3 h. The yield can be over 99.5% under optimum conditions and the qualities of products agree with or exceed national standards for it. The catalyst which has no corrosion and little environmental pollution was used repeatedly for 5 times with the yield still around 99.0% by simply regeneration.