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Wyeth Holdings LLC
Original Assignee
American Cyanamid Co
Publication date
Application grantedgrantedCritical
Publication of CA541082ApublicationCriticalpatent/CA541082A/en
Process for the production of urea from a solution containing ammonium carbamate, ammonia and water, with a total recycle of ammonia and carbon dioxide which were not transformed
Process for the production of urea by synthesis of ammonia and carbon dioxide, with total recycling of the portion which has not been converted into urea