Hardness suppression in urea solutions
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United States of America Patent
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Aug 15, 1995
Issued Date -
N/A
app pub date -
Oct 3, 1991
filing date -
Apr 29, 1988
priority date (Note) -
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Abstract
The tendency of aqueous solutions of urea and other NH-containing compositions to force instability of hardness factors has been found to be detrimental to processes and apparatus employing them. The reliability of these processes and apparatus is improved by the inclusion of hardness-suppressing compositions, which preferably include both a water-soluble polymer and a phosphonate. In particular, agricultural and NO.sub.x -reducing applications are improved, especially for solutions containing urea hydrolysis products and the salts of them.
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