公开(公告)号：US20220219156A1

公开(公告)日：2022-07-14

申请号：US17607756

申请日：2020-04-27

申请人： thyssenkrupp Industrial Solutions AG ,  thyssenkrupp AG

发明人： Christoph GLOTZBACH ,  Nils TENHUMBERG ,  Tarek EL HAWARY ,  Yevgeny MAKHYNYA ,  Walter LEITNER ,  Jürgen KLANKERMAYER ,  Hannah SCHUMACHER

IPC分类号： B01J31/24 ,  C07C273/02

摘要： A ruthenium-phosphine complex can be used as a catalyst in a method for the catalytic synthesis of urea. The method may comprise more particularly a reaction of formamide or of formamide with ammonia in the presence of the catalyst to form urea and hydrogen. Through the use of the ruthenium-phosphine complex as the catalyst, catalytic preparation of urea from formamide or from formamide with ammonia is provided for the first time. This allows for synthesis under mild conditions and virtually no formation of byproducts. Further, using an acid as a cocatalyst in the catalytic synthesis or the reaction can lead to an improvement in urea yield.

公开(公告)号：US20220234999A1

公开(公告)日：2022-07-28

申请号：US17607716

申请日：2020-04-27

申请人： thyssenkrupp Industrial Solutions AG ,  thyssenkrupp AG

发明人： Yevgeny MAKHYNYA ,  Tarek EL HAWARY ,  Christoph GLOTZBACH ,  Nils TENHUMBERG ,  Walter LEITNER ,  Jürgen KLANKERMAYER ,  Hannah SCHUMACHER

IPC分类号： C07C273/02 ,  C07C231/10 ,  C07C273/10

摘要： A process for preparing urea comprises preparing formamide based on carbon dioxide, hydrogen, and ammonia, forming methyl formate or ammonium formate as an intermediate in a catalytic reaction, and preparing urea by reacting the formamide and possibly ammonia in the presence of a catalyst. The source of carbon dioxide is a liquid laden with chemically and/or physically bound carbon dioxide and selected from a methanol phase or an aqueous ammonia solution obtained by gas scrubbing of a syngas for removing carbon dioxide using a scrubbing fluid. The scrubbing fluid can be a methanol phase, or carbon dioxide is desorbed from the scrubbing fluid and absorbed into a methanol phase to give a carbon dioxide-laden methanol phase that is then reacted as carbon dioxide-containing stream with a hydrogen-containing stream in the presence of a catalyst to form methyl formate. The methyl formate is reacted with an ammonia-containing stream to form formamide.