ZrO2鈥揗oO3 for the Acetalization of 1,3-Propanediol from Dilute Solutions

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• 作者：Min Wu ; Chun-long Li ; Jin Zhang ; Chun-cun Miao ; Ying-ping Zheng ; Yue-ming Sun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：May 9, 2012
• 年：2012
• 卷：51
• 期：18
• 页码：6304-6309
• 全文大小：333K
• 年卷期：v.51,no.18(May 9, 2012)
• ISSN：1520-5045

文摘

A reactive isolation approach for the recovery of 1,3-propanediol (1,3-PD) from dilute aqueous solutions was performed on ZrO₂鈥揗oO₃ solid heterogeneous catalysts through a cyclic reaction with aldehyde to form acetals (2-methyl-1,3-dioxane, 2MD). The effects of catalyst composition, reaction temperature, reaction time, and optimal dose on the conversion rates of acetalization and hydrolysis were investigated. For ZrO₂鈥?0 wt % MoO₃ prepared by the precipitation鈥搃mpregnation method, the conversion rate of 1,3-PD in acetalization reached 95.7% at 60 掳C for 2 h, and the acetals conversion in the hydrolysis reaction reached 97.0% at 100 掳C for 10 h. The stability test showed that the 1,3-PD conversion rate still reached 87.3% after five cycles of use. In terms of the catalytic activity in acetalization, the 10 wt % catalyst exhibited much higher selectivity in the simulated fermentation liquid for 1,3-PD than ethanol, 2,3-butanediol, and glycerol. This indicates that ZrO₂鈥?0 wt % MoO₃ mixed oxide has the best characteristics for the extraction of 1,3-PD from dilute aqueous solutions.