公开(公告)号：US20190300497A1

公开(公告)日：2019-10-03

申请号：US16368141

申请日：2019-03-28

申请人： Celanese Sales Germany GmbH

发明人： Joni Sianturi ,  Hanno Hueckstaedt ,  Matthias Göring ,  Damian Feord ,  Stanley Leonard

IPC分类号： C07D323/06 ,  B01J8/02 ,  B01D3/00

摘要： 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.

公开(公告)号：US10829467B2

公开(公告)日：2020-11-10

申请号：US16368141

申请日：2019-03-28

申请人： Celanese Sales Germany GmbH

发明人： Joni Sianturi ,  Hanno Hueckstaedt ,  Matthias Göring ,  Damian Feord ,  Stanley Leonard

IPC分类号： C07D323/06 ,  B01J8/02 ,  B01D3/00

摘要： 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.