Methods for cleaning materials

Details Methods for cleaning materials Methods for cleaning materials

1984-12-07

1986-05-20

Corbin, Arthur L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 2214, 134 38, 134 40, 134 41, C23G 102, B08B 900

Patent

active

045899258

ABSTRACT:
Acid-reactive organic and inorganic matter, such as stains and/or deposits, is removed from substrates by contacting such matter with a composition containing urea and sulfuric acid in which the urea/sulfuric acid molar ratio is less than 2. The urea-sulfuric acid compositions may optionally contain other components such as water, surfactants, and/or non-aqueous polar solvents which accentuate the activity of the compositions toward hydrophobic materials. The water-containing compositions which have H.sub.2 O/(urea+H.sub.2 SO.sub.4) molar ratios below about 2.5 are particularly useful for removing hydrolyzable matter by partial or complete hydroylsis.

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