Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1978-09-14
1981-11-17
Albrecht, Dennis L.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 19, 252 82, 252180, 252390, 252394, 252527, 252546, 148 614R, 422 16, C11D 732, C23G 114, C23G 118, F28G 900
Patent
active
RE0307963
ABSTRACT:
Removing iron oxide scale or a mixture of iron oxide scale and hardness scale from a metal surface by contacting said scale with an aqueous solution containing at least one of an ammonium, amine, or hydroxyalkylamine salt of nitrilotriacetic acid, N-2, -hydroxyethylaminodiacetic acid, or alkylenepolyamine polycarboxylic acid at a pH of 8 to 11.
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Albrecht Dennis L.
Kanuch Bruce M.
The Dow Chemical Co.
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