SCRUBBING OF AMMONIA WITH UREA AMMONIUM NITRATE SOLUTION
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United States of America Patent
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Issued Date -
Dec 23, 2010
app pub date -
Jul 11, 2008
filing date -
Jul 12, 2007
priority date (Note) -
Abandoned
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Abstract
A process for scrubbing ammonia in a CO2 removal process having the steps of absorbing (204) at least some CO2 from a gas stream (202) with an ammonium carbonate solution or a mixed alkali solution, resulting in a release of >ammonia; regenerating (210) ammonium.carbonate or mixed alkali solution to produce a concentrated CO2 stream; capturing ammonia with an ammonia capture mass transfer apparatus (214). with a concentrated urea ammonium nitrate solution; adjusting the pH of the urea ammonium nitrate solution to between 4 and 6 with nitric acid; and adding urea to the urea ammonium nitrate solution, thereby producing a urea ammonium nitrate (UAN) fertilizer product ready for commercial distribution.
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