Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1989-10-03
1991-02-19
Albrecht, Dennis
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 3, 134 19, 134 2211, 134 41, 252 87, 252142, 252148, B08B 308, C11D 708, C11D 732, C23G 304
Patent
active
049934422
ABSTRACT:
Acid-soluble and/or hydrolyzable obstructions are removed from conduits by contacting such obstructions with a composition containing the reaction product of sulfuric acid and a chalcogen-containing compound having the empirical formula R.sub.1 -- CX -- R.sub.2 wherein X is a chalcogen, R.sub.1 and R.sub.2 are independently chosen from hydrogen, NR.sub.3 R.sub.4 or NR.sub.5, with at least one of R.sub.1 and R.sub.2 being other than hydrogen, R.sub.3 and R.sub.4 are independently chosen from hydrogen or monovalent organic radicals, and R.sub.5 is a divalent organic radical. Preferably, the molar ratio of the chalcogen-containing compound to sulfuric acid is about 1/4 or more. Compositions particularly useful for removing deposits containing hydrolyzable constituents have chalcogen compound/sulfuric acid molar ratios less than 2. The compositions may optionally contain other components such as surfactants and/or non-aqueous polar solvents which accentuate their activity toward hydrophobic materials. Compositions which have H.sub.2 O/(chalcogen compound+H.sub.2 SO.sub.4) molar ratios below about 2.5 are particularly useful for removing obstructions by partial or complete hydrolysis. Urea is a most preferred chalcogen-containing compound.
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Albrecht Dennis
Laird Michael H.
Union Oil Company of California
Wirzbicki Gregory F.
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