-
公开(公告)号：US20170152210A1
公开(公告)日：2017-06-01
申请号：US15320807
申请日：2015-06-22
IPC分类号： C07C201/08 , B01J19/24 , C07C201/16
CPC分类号： C07C201/08 , B01J19/24 , B01J2208/00637 , B01J2208/00646 , B01J2208/00716 , B01J2219/00033 , B01J2219/24 , C07C201/16 , C07C205/06
摘要： This invention relates to methods for producing chemical products, wherein the one or more feed materials are reacted to form a chemical product or a chemical composition. The invention further relates to plants for performing such methods, said plants being designed in such a way that, during an interruption of the methods, no input of at least one feed material into the reaction occurs and the plant parts not affected by a revision measure, maintenance measure, repair measure, or cleaning measure are operated in so-called re-circulation mode. It is thereby achieved, among other things, that only the affected plant part needs to be shut down for the time of the measure, which can be advantageous with regard to the productivity and economy of the method and the quality of the produced products. Finally, the invention relates to methods for operating plants in the event that individual plant parts are taken out of service.
-
2.发明申请公开(公告)号：US20200087244A1
公开(公告)日：2020-03-19
申请号：US16470300
申请日：2017-12-18
IPC分类号： C07C209/78 , C07C209/54
摘要： The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities. By adapting the temperatures in the acid-catalysed rearrangement step, the rearrangement reaction can be fully completed despite the change in dwell time inevitably associated with changed production capacity, with no undesired changes occurring in the product composition.
-
公开(公告)号：US20200087243A1
公开(公告)日：2020-03-19
申请号：US16470288
申请日：2017-12-18
IPC分类号： C07C209/54 , C07C209/60 , C07C209/78
摘要： The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities with alteration of the isomer composition in the resulting diamines of the diphenylmethane series (altering the 2,4′-MDA content). Adapting the molar ratios of the total used aniline to the total used formaldehyde and of the total used acid catalyst to the total used aniline, and adapting the reaction temperature, allows the rearrangement reaction to be fully completed despite the change in dwell time inevitably associated with a change in production capacity, and allows the formation of undesired by-products to be avoided as far as possible; the intended modification to binuclear content is likewise achieved.
-
-
搜索结果
3 条记录 (耗时 0.013 秒)
