Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1975-08-28
1976-12-07
Bashore, S. Leon
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 3, 134 28, 134 29, 134 41, C23G 100
Patent
active
039960625
ABSTRACT:
Iron containing scale is removed from a metallic substrate by contacting the scale with a composition which is an aqueous solution consisting essentially of at least 0.5 weight percent of a polyphosphonic acid, or an alkali metal or amine salt of such acid, with the acid being selected from the group of acids having the formulae: ##STR1## where R.sub.1 is selected from the class consisting of C.sub.1 -C.sub.12 alkyl groups, and the group ##STR2## and ##STR3## where R.sub.2 is selected from the class consisting of --H, --PO.sub.3 H.sub.2, C.sub.1 -C.sub.12 alkyl groups, and the group ##STR4## The scale is removed from the metallic substrate by contacting THE DESCRIBED SCALE-BEARING SUBSTRATE WITH THE DESCRIBED COMPOSITION AT SELECTED TEMPERATURE AND PH conditions, and over a controlled time period and iron concentration in the composition so that the formation of an undesirable polymeric precipitate in the cleaning solution is avoided. Formation of the precipitate is also avoided by adding ammonium bifluoride to the composition.
REFERENCES:
patent: 2261700 (1941-11-01), Ryznar
patent: 2524825 (1950-10-01), Pabst et al.
patent: 3440170 (1969-04-01), Hek
patent: 3634257 (1972-01-01), Porter et al.
patent: 3794523 (1974-02-01), Thompson
patent: 3854996 (1974-12-01), Frost et al.
Banks William P.
Frost Jack G.
Martin Larry D.
Bashore S. Leon
Caroff Marc L.
Halliburton Company
Laney William R.
Tregoning John H.
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