Apparatus for the removal of ammonium carbamate from a urea-synt

Distillation: apparatus – Apparatus – Systems

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165 96, 165111, 165139, 202203, B01D 334

Patent

active

044862709

ABSTRACT:
An improved process and apparatus for the removal of ammonium carbamate from an aqueous urea solution wherein the aqueous urea solution is introduced into a stripping zone and caused to flow down a heat exchange wall as a thin film while being heated and contacted in counter-current relation with a gaseous stripping agent. The aqueous urea solution, while being stripped, is heated for at most 5 seconds at a temperature in the range of from 180.degree.-195.degree. C. and thereafter cooled to a temperature of from 155.degree.-170.degree. C.

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