摘要:
The invention relates to a production process for polyamines through condensation of aromatic amines with formaldehyde employing at least one solid zeolite catalyst partially or fully ion-exchanged to the protonic form which has been A) alkaline-treated, wherein the alkaline treatment is in case of BEA zeolites carried out in the presence of a pore-directing agent and in case of zeolites other than BEA zeolites in the presence or absence of a pore-directing agent, or H) acid-treated without any alkaline treatment preceding or following said acid treatment, wherein the acid treatment is effected with an organic acid with chelating function.
摘要:
The 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 recirculation 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.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Di- und Polyaminen der Diphenylmethanreihe (MDA), bei dem zunächst Roh-MDA hergestellt und dieses dann destillativ aufgearbeitet wird, wobei die destillative Aufarbeitung Folgendes umfasst: • In einer Destillationskolonne, Abtrennen eines Anilin und Wasser enthaltenden Stroms als Kopfprodukt unter Erhalt des ersten Produktstroms als Sumpfprodukt, • in dieser Destillationskolonne oder in einer stromabwärts zu dieser Destillationskolonne angeordneten Vorrichtung, Strippen mit Wasserdampf unter Erhalt eines gasförmigen Anilin, Wasser und MMDA enthaltenden Stroms, • partielles Kondensieren dieses gasförmigen, Anilin, Wasser und MMDA enthaltenden Stroms unter Erhalt eines MMDA und Wasser (sowie gegebenenfalls Anilin) enthaltenden flüssigen Stroms und eines gasförmigen Stroms enthaltend Anilin und Wasser (sowie gegebenenfalls MMDA), • Trocknen des durch das partielle Kondensieren erhaltenen MMDA und Wasser (sowie gegebenenfalls Anilin) enthaltenden flüssigen Stroms unter Erhalt des zweiten Produktstroms.
摘要:
The invention relates to a production process for polyamines through condensation of aromatic amines with formaldehyde employing at least one solid zeolite catalyst partially or fully ion-exchanged to the protonic form which has been A) alkaline-treated, wherein the alkaline treatment is in case of BEA zeolites carried out in the presence of a pore-directing agent and in case of zeolites other than BEA zeolites in the presence or absence of a pore-directing agent, or H) acid-treated without any alkaline treatment preceding or following said acid treatment, wherein the acid treatment is effected with an organic acid with chelating function.