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US 3,946,073 AGranted
Process for preparation of urea autocondensation product
AssigneeThe Dow Chemical Company
InventorWilliam H. Cook, Jr.
Life of this patent
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Abstract
Urea is pyrolyzed in a falling film reactor at a temperature of from about 180.degree. to about 240.degree.C. A short residence time in the reactor provides for good urea conversion with minimal formation of other autocondensation pyrolyzates.
Claims4
A process for preparing biuret which comprises
- a. introducing a urea feedstock, said feedstock being urea or a mixture of urea, biuret and other urea autocondensation products, into a heated falling film reactor,
- b. passing said urea feedstock through said heated reactor as a thin film and at a flow rate of from about 180 to about 600 pounds of actual urea feedstock/hour/foot of reactor cylinder periphery (lb/hr/ft) which provides a biuret pyrolysis product exiting from said reactor at a temperature of from about 180.degree.C. to about 240.degree.C.,
- c. removing evolved ammonia from the falling film reactor system as it is formed, and
- d. recovering the biuret product.
1 more element
Dependencies are inferred from the claim text.