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A continuous process for the synthesis of urea from liquid ammonia and liquid carbon dioxide has been developed and described. A small unit for the production of 175 pounds of urea per day has been designed,constructed, and successfully operated. An exothermic autoclave reaction is indicated both by calculation and observation. Thirty-five to thirty-seven per cent conversions of the reactants to urea have been attained in a reaction period of less than 2 hours.