Process for urea production involving a carbon dioxide stripping step
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United States of America Patent
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Aug 11, 1998
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app pub date -
Nov 15, 1995
filing date -
Jan 7, 1993
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Abstract
An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea recovery section of the solution leaving the high-yield reactor, are added to the pre-existing urea plant, means being provided for recycling unreacted ammonia and carbon dioxide vapors as well as a carbamate solution obtained in the urea recovery section to the pre-existing reactor.
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