Methods for removing obstructions from conduits with urea-sulfur

Details Methods for removing obstructions from conduits with urea-sulfur Methods for removing obstructions from conduits with urea-sulfur

1984-11-28

1987-06-16

Albrecht, Dennis L.

Compositions

Dust suppressants for bulk materials, or processes of...

134 3, 134 19, 134 2211, 134 2214, 252142, 252148, B08B 308, C11D 708, C11D 732, C23G 304

Patent

active

046735224

ABSTRACT:
Acid-soluble and/or hydrolyzable obstructions are removed from conduits by contacting such obstructions 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 surfactants and/or non-aqueous polar solvents which accentuate the activity of the compositions toward hydrophobic materials. Urea-sulfuric acid compositions which contain water and which have H.sub.2 O/(urea+H.sub.2 SO.sub.4) molar ratios below about 2.5 are particularly useful for removing obstructions by partial or complete hydrolysis.

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