1938 Ropp Du Pont 2116881 Urea Synthesis – pure ammonia recycle
This patent describes an improved efficiency of the urea process by separating pure ammonia from the carbamate via distillation. In fact this patent describes the pure ammonia recycle in many urea processes still existing today.
1938 Ropp Du Pont 2116881 Urea Synthesis – pure ammonia recycle.pdf
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