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Two-three heated moles of ammonia to one mol of heated carbon dioxide, heated at 160° to 210° C. is forced through a reactor which has an aqueous solution or oil-water slurry of ammonia and carbon dioxide which is being circulated at 160° to 210° C. and under 2-6000 psi to form ammonium carbamate which when heated lose 1 mol of water thereby producing a heated aqueous solution containing 60 to 80% urea, then 1 mole of sulfuric acid is added to 4 moles of the aqueous solution of urea thereby producing an ammonium urea condensate salt of sulfuric acid and some urea sulfate and biuret sulfate. The aqueous urea contains smaller amounts of ammonia, ammonium carbonate and biuret.

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