申请人:Celanese Sales Germany GmbH
公开号:US10829467B2
公开(公告)日:2020-11-10
A process for producing a cyclic acetal is disclosed. According to the process, a formaldehyde source is combined with an aprotic compound and contacted with a heterogeneous catalyst which causes the formaldehyde source to convert into a cyclic acetal such as trioxane. The catalyst, for instance, may comprise a solid catalyst such as an ion exchange resin. In one embodiment, the process is used for converting anhydrous formaldehyde gas to trioxane. The anhydrous formaldehyde gas may be produced form an aqueous formaldehyde solution by an extractive distillation. The aprotic compound and the formaldehyde solution may be extracted from the reaction product and recycled into the process.
本发明公开了一种生产环缩醛的工艺。根据该工艺,甲醛源与惰性化合物结合,并与异相催化剂接触,使甲醛源转化为环缩醛(如三氧六环)。例如,催化剂可包括固体催化剂,如离子交换树脂。在一个实施方案中,该工艺用于将无水甲醛气体转化为三氧环己烷。无水甲醛气体可通过萃取蒸馏生成甲醛水溶液。可从反应产物中萃取壬烷化合物和甲醛溶液,并将其回收到工艺中。