A Reactive Distillation Process To Produce 5-Hydroxy-2-methyl-1,3-dioxane from Mixed Glycerol Acetal Isomers
作者:Xi Hong、Omar McGiveron、Carl T. Lira、Alvaro Orjuela、Lars Peereboom、Dennis J. Miller
DOI:10.1021/op200072x
日期:2012.5.18
cis-5-hydroxy-2-methyl-1,3-dioxane (1) as the most volatile. When the distillation is carried out in the presence of an acid catalyst to promote interconversion, 1 is obtained as a nearly pure distillate stream. This is further adapted to a continuous reactive distillation which produced 90–96% 1. Thus a novel process is presented to convert glycerol to the desired acetal (1), which can be further converted to
四种环状甘油缩醛异构体可以通过甘油与乙醛或相关缩醛物质的酸催化反应而容易地制备。在缩醛形成中使用的酸催化剂存在下,异构体相互转化形成平衡混合物,该混合物包含相似量的四种产物。真空蒸馏可以将四个缩醛分离成它们的纯化形式,其中顺式-5-羟基-2-甲基-1,3-二恶烷(1)最易挥发。当蒸馏是在酸催化剂的存在下进行,以促进相互转换,1作为一个几乎是纯的馏出物流得到。这进一步适合于连续反应蒸馏,产生90-96%1。因此,提出了将甘油转化为所需缩醛(1)的新方法,该缩醛可以进一步转化为产物,例如1,3-丙二醇和二羟基丙酮。