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Machine translation
1. (WO1980002425) PROCESS FOR CONCENTRATING AQUEOUS UREA SOLUTION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/002425    International Application No.:    PCT/JP1980/000088
Publication Date: 13.11.1980 International Filing Date: 25.04.1980
IPC:
C07C 273/16 (2006.01)
Applicants:
Inventors:
Priority Data:
79/52519 01.05.1979 JP
Title (EN) PROCESS FOR CONCENTRATING AQUEOUS UREA SOLUTION
(FR) PROCEDE DE CONCENTRATION D"UNE SOLUTION AQUEUSE D"UREE
Abstract: front page image
(EN)A process for concentrating an aqueous urea solution, which comprises concentrating an aqueous urea solution having a concentration of, preferably, 70-90 wt.% under vacuum to a concentration of 95-99 wt.%, and contacting the thus obtained urea solution with an air stream at an elevated temperature, preferably 135-200 C, in a countercurrent manner under ordinary pressure to thereby concentrate the same to a concentration of 99.5 wt.% or more.
(FR)Procede de concentration d"une solution aqueuse d"uree, qui consiste a concentrer sous vide une solution aqueuse d"uree ayant une concentration, de preference de 70 a 90% en poids, jusqu"a 95 a 99% en poids et a mettre la solution d"uree ainsi obtenue en contact avec un courant d"air a temperature elevee, de preference 135 - 200 C, a contre-courant et sous pression ordinaire pour ainsi la concentrer jusqu"a 99,5% en poids ou plus.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)