申请人:GENERAL ELECTRIC COMPANY
公开号:EP0684232A1
公开(公告)日:1995-11-29
A process for making bis(ether anhydrides) employs alkylamines having low melting temperatures thus allowing for novel intermediate process steps for preparing bis(ether anhydrides). The alkylamines have alkyl groups which contain at least three carbon atoms and have boiling temperatures in the range of 48 to 250°C at atmospheric pressure. As a result of using these amines, liquid alkylamines now can be employed in the imidization process step. The N-alkyl nitrophthalimides prepared from the recovered imidization product according to this invention can now be purified using liquid/liquid extraction or vacuum distillation. The alkyl nitrophthalimides prepared according to this invention provide for displacement reactions which now can be run at a high solids level. Likewise, the exchange reaction can be run at a higher solids level, and thus achieves an efficiency level which is higher than conventional processes.
一种制造双(醚酐)的工艺采用了具有低熔点的烷基胺,从而实现了制备双(醚酐)的新型中间工艺步骤。这些烷基胺具有至少含有三个碳原子的烷基,在常压下的沸点范围为 48 至 250°C。由于使用了这些胺,现在可以在亚胺化工艺步骤中使用液态烷基胺。根据本发明,从回收的亚胺化产物中制备的 N-烷基硝基邻苯二甲酰亚胺现在可以使用液/液萃取或真空蒸馏进行纯化。根据本发明制备的烷基硝基邻苯二甲酰亚胺可用于置换反应,该反应现在可以在高固体水平下进行。同样,置换反应也可以在较高的固体含量下进行,从而达到比传统工艺更高的效率水平。