Urea process with high-temperature stripping
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United States of America Patent
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Sep 22, 2020
Grant Date -
Dec 20, 2018
app pub date -
Dec 9, 2016
filing date -
Dec 11, 2015
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Abstract
A shell-and-tube stripper for carbamate decomposition and ammonia recovery from a urea solution comprising a bundle of heated tubes, said tubes being fed with said urea solution and carbon dioxide as stripping medium, the urea solutions forming a liquid falling film on the internal surface of the tubes and the carbon dioxide forming a counter-current gaseous flow; said tubes comprise an external layer made of super austenitic or super duplex stainless steel and an internal layer made of zirconium, said internal layer reaching temperatures higher than 220° C.
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