Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1994-11-29
1996-05-21
Hruskoci, Peter A.
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
210699, 210700, 210701, 252180, 252391, 252392, 252395, 252396, 422 15, 422 16, 422 17, C02F 514
Patent
active
055186297
ABSTRACT:
A method of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of 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--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; and Y and Y.sup.1 each independently represent a substituted or non-substituted carboxylic acid functionality such that said alkylpolycarboxylate has at least 2 carboxylic acid functional groups.
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Carey William S.
Freese Donald T.
Perez Libardo A.
Rockett Judith B.
Betz Laboratories Inc.
Boyd Steven D.
Hruskoci Peter A.
Ricci Alexander D.
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