UREA PRODUCTION METHOD
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United States of America Patent
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Apr 1, 2016
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Apr 1, 2015
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Abstract
The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step. The present invention can produce a urea solution containing no additive for producing solid urea, while using the additive.
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