Prelog et al.
Justus Liebigs Annalen der Chemie, 1937 , vol. 532, p. 80
Chem.Abstr., 1940 , p. 4396
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Prelog et al.
Patent: US2192840 , 1938 ;
in water P=112511 Torr; 0.666667 h; an apparatus is described and claimed comprising a condensation and synthesis column and a stripper where the unreacted ammonia and carbon dioxide are separated from the urea and recycled to the separation and synthesis column where they are reacted with ammonia;
