Preparation and performance of triethylene glycol diisooctanoate by catalytic method
SO2-4/ZrO2-γ-Al2O3 solid acid catalyst was prepared by precipitation-impregnation method.Preparation of triethylene glycol diisooctanoate(TGDE)by catalytic method using esterification reaction of triethylene glycol and 2-ethylhexanoic acid as probe reaction.The optimal conditions of preparation were performed to confirm.The results show that the optimum preparation conditions for solid acid catalyst through precipitation-impregnation method are calcination temperature is 600 ℃,the calcination time is 5 h,the sulfuric acid impregnation concentration is 0.6 mol·L-1,the sulfuric acid impregnation time is 9 h,and the aging temperature is-20℃.The conversion of triethylene glycol reachs to 99.06％ and still remains 90.54％ after recycling 5 times at the optimum conditions.The target product TGDE was anal-yzed and detected by gas chromatography,FT-IR,1 HNMR,and 13CNMR,and all performance indicators met the requirements of national standards.
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