Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1987-10-19
1989-01-17
Wax, Robert A.
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
210699, 252180, 25238922, 25238923, 422 15, 422 17, C02F 514
Patent
active
047986751
ABSTRACT:
Corrosion inhibiting compositions for inhibiting corrosion and the deposition of mineral scale on metal in aqueous systems contain sequestrants such as carboxylic acids, phosphates, or optionally sulfur containing lignosulfonates, as well as carboxylated phosphonic acids of the formula ##STR1## wherein m is from 1 to about 6, wherein n is from 0 to about 6, wherein R is --H, -alkyl, -alkenyl, -alkynyl, -aryl, -alkyl substituted aryl, -cycloalkyl, -methylene phosphonic acid, or -methylene carboxylic acid, and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently is --H, -alkyl, -aryl, -alkyl substituted aryl, --OH, --SH, --NH.sub.2, --PO.sub.3 H.sub.2, --CH.sub.2 PO.sub.3 H.sub.2, --CO.sub.2 H, --CH.sub.2 CO.sub.2 H, halogen, or --SO.sub.3 H. The composition can also contain other corrosion inhibiting compounds such as azoles, molybdates, and the like.
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Chang Kelvin Y.
Lipinski Richard J.
The Mogul Corporation
Wax Robert A.
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