公开(公告)号：US4316767A

公开(公告)日：1982-02-23

申请号：US186058

申请日：1980-09-11

申请人： Toyoyasu Saida ,  Takatatsu Shimokawa ,  Yuzuru Yanagisawa ,  Takashi Nagahama ,  Koji Ishida

发明人： Toyoyasu Saida ,  Takatatsu Shimokawa ,  Yuzuru Yanagisawa ,  Takashi Nagahama ,  Koji Ishida

IPC分类号： C07C273/00 ,  C07C67/00 ,  C07C239/00 ,  C07C273/16 ,  B01D1/22

CPC分类号： C07C273/16

摘要： Disclosed is a process for concentrating aqueous urea solutions in which an aqueous urea solution is allowed to flow as a falling film in countercurrent contact with a stream of hot inert gas to concentrate it to 95-99% by weight and the aqueous urea solution so concentrated is then passed through a packed zone in cocurrent contact with a stream of hot inert gas to concentrate it to not less than 99.5% by weight.

摘要翻译： 公开了一种浓缩尿素水溶液的方法，其中使尿素水溶液作为降膜与热惰性气体流逆流接触流动，将其浓缩至95-99重量％，并将尿素水溶液浓缩 然后通过与热惰性气体流并流接触的填充区域，以将其浓缩至不小于99.5重量％。