Hardness suppression in urea solutions

Details Hardness suppression in urea solutions Hardness suppression in urea solutions

1995-06-07

1997-07-08

McAvoy, Ellen M.

Compositions

Water-softening or purifying or scale-inhibiting agents

Plant or organic material containing

252180, 210699, 210700, 510531, C02F 510

Patent

active

056457561

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.

REFERENCES:
patent: 3032387 (1962-05-01), Holger et al.
patent: 3214454 (1965-10-01), Blaser et al.
patent: 3297578 (1967-01-01), Crutchfield et al.
patent: 3303139 (1967-02-01), Blaser et al.
patent: 3599427 (1971-08-01), Jones et al.
patent: 3733270 (1973-05-01), Kerst
patent: 3890228 (1975-06-01), Hwa et al.
patent: 3898037 (1975-08-01), Lange et al.
patent: 3900554 (1975-08-01), Lyon
patent: 4155869 (1979-05-01), Durham
patent: 4208386 (1980-06-01), Arand et al.
patent: 4325924 (1982-04-01), Arand et al.
patent: 4460793 (1984-07-01), Persinski et al.
patent: 4568469 (1986-02-01), Crump et al.
patent: 4680124 (1987-07-01), Young et al.
patent: 4744949 (1988-05-01), Hoots et al.
patent: 4752443 (1988-06-01), Hoots et al.
patent: 4756881 (1988-07-01), Hoots et al.
patent: 4756890 (1988-07-01), Tang et al.
patent: 4777024 (1988-10-01), Epperly et al.
patent: 4780289 (1988-10-01), Epperly et al.
patent: 4818506 (1989-04-01), Lin et al.
patent: 4828713 (1989-05-01), McDonald et al.
patent: 4834955 (1989-05-01), Mouche et al.
patent: 4842834 (1989-06-01), Burton
patent: 4894169 (1990-01-01), Delitsky
patent: 4904413 (1990-02-01), Hoots et al.
patent: 4919821 (1990-04-01), Fong et al.
patent: 4923634 (1990-05-01), Hoots et al.
patent: 4959156 (1990-09-01), Lickei et al.
patent: 4997631 (1991-03-01), Hofmann et al.
patent: 5441713 (1995-08-01), Dubin et al.
The Role of Minute Droplets in the Separation of Aerosols from Gases, Chawal, J.M., Chem. Eng. Process 24 (1989), pp. 201-205 month N/A.
Flussigkeitszerstaubungs-und Impragnierungsanlagen, Chawala, J.M., Sonderdruck Chemie-Technik (1980), pp. 2-4, month N/A.
Atomisation of Liquids Employing the Low Sonic Velocity in Liquid/Gas Mixtures, Chawla, J.M., International Congress on Liquid Atomization and Spraying Systems, Imperial College (1985), month N/A.
Reduction of Noxious Gas and Fines Emission by Dry Sorption and Filtering Dust Collectors Installed Behind Combustion Plants, Glinka, U., Bundesministerium fur Forschung und Technologie (BMF1), 1984, month N/A.
NO.sub.x Control for Municipal Solid Waste Combustors, Hofmann, J. et al, Air & Waste Management Assn., Pittsburgh, PA Jun. 24-29, 1990.
The NO.sub.x OUT Process for the Control of the NO.sub.x Emissions from Waste Incinerators, Pachaly, R., et al, Air & Waste Management Assn., Vancouver, B.C., Jun. 16-21, 1991.

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