TREATMENT OF WATER VAPOR GENERATED IN CONCENTRATING AN AGUEOUS UREA SOLUTION

摘要

A method was discribed of the removal of water vapor and the recovery of NH3 gas simultaneously in mixed gases involving CO2 which was produced from ammonium carbamate soln. by cooling and condensation of small amts. of gases in the urea synthetic process. Ammonium carbamate soln. was rectified under gauge pressure less than 25kg/cm2 and generally composed of NH3, CO2 and vapor.