Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1997-11-18
1999-02-02
Howard, Jacqueline V.
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
252390, 252394, 252395, 252396, 210699, 210700, 210701, C20F 514
Patent
active
058660321
ABSTRACT:
A composition for of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a composition comprising a scale/corrosion inhibitor in combination with a substituted alkylpolycarboxylate is employed. The scale/corrosion inhibitor can be a phosphonate such as hydroxyethylidene diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyphosphonoacetic acids, amino phosphonates; terpolymers, copolymers and homopolymers of acrylic acid, maleic acid, epoxysuccinic acids such as polyepoxysuccinic acid or mixtures thereof. The substituted alkylpolycarboxylates are compounds of the general structure: R--X.sub.m --Y.sub.n wherein R is a hydrocarbon functionality having 4 to 18 carbons; X, when present, is --NH--, --NY.sup.1 --, --N-->O, --N--OC--Y.sup.1, --O-- or --S--; n is greater than or equal to 1; m=O or 1; and Y and Y.sup.1 each independently represent a substituted or nonsubstituted carboxylic acid functionality such that said alkylpolycarboxylate has at least 2 carboxylic acid functional groups.
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Barron Judith L.
Carey William S.
Freese Donald T.
Perez Libardo A.
BetzDearborn Inc.
Boyd Steven D.
Howard Jacqueline V.
Ricci Alexander D.
Toomer Cephia D.
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