公开(公告)号：DE372262C

公开(公告)日：1923-03-26

申请号：DEB0095592

申请日：1920-08-17

Applicant: BASF AG

Inventor： GAUS DR WILHELM ,  MEISER DR WILHELM ,  EBERHARDT DR ERNST

IPC: C07C273/04

Abstract: In the manufacture of urea by forcing a mixture of ammonia and carbon dioxide into an autoclave, the gases are brought to the necessary pressure by expelling either or both of them from solutions capable of giving them off, by means of heat. By way of example, a concentrated solution of ammonium carbonate or carbamate is forced into a heated column, the gas mixture produced passed through a cooler at about 110-150 DEG C., and the condensate run into an autoclave where it is heated at 130-150 DEG C. until the conversion into urea no longer proceeds. The autoclave may be filled and discharged either at intervals or continuously, or the process can be carried out with single charges, when the column is replaced by a pressure-resisting vessel. The unconverted gases are expelled from the urea solution and used, together with fresh gases, to saturate the exhausted liquid from the column for further use. The gaseous ammonia and carbon dioxide may be generated in separate columns, for example, from aqueous ammonia and sodium or ammonium bicarbonate solution respectively, or one of the gases may be forced into the autoclave by means of a compressor.

公开(公告)号：DE406496C

公开(公告)日：1924-11-21

申请号：DEB0107110

申请日：1922-11-08

Applicant: BASF AG

Inventor： GAUS DR WILHELM ,  WILD DR WILHELM

IPC: C01B3/02