Appeal No. 2006-2485 Page 3
Application No. 10/925,646
1. A method for removing iron deposits from the surface of a closed
loop system comprising the steps of:
(a) contacting the surface of the closed loop system having iron
deposits with an aqueous solution of an oxygen scavenger; and
(b) introducing dialkylhydroxylamine into the closed loop system at
a concentration sufficient to cause the iron deposits to release from
the surface of the closed loop system;
wherein the dialklhydroxylamine is selected from the group
consisting of diethylhydroxylamine, di-isopropylhydroxylamine, and
mixtures thereof.
5. The method of Claim 1 wherein the oxygen scavenger is selected
from the group consisting of a sulphite salt, a bisulfite salt and
mixtures thereof.
6. The method of Claim 5 wherein the oxygen scavenger is sodium
bisulfite.
15. A method for removing iron deposits from the surface of a closed
loop system comprising the steps of:
(a) contacting the surface of the closed loop system having iron
deposits with an aqueous solution of an oxygen scavenger;
(b) introducing dialkylhydroxylamine into the system at a
concentration sufficient to cause the iron deposits to release from
the surface of the closed loop system; and
(c) introducing a dispersant into the system;
wherein the dialkylhydroxylamine is selected from the group
consisting of diethylhydroxylamine, di-isopropylhydroxylamine, and
mixtures thereof.
21. The method of claim [15] wherein the dispersant is a copolymer of acrylic
acid and 2-acrylamido-2-methyl propane sulfonic acid
Thus, claim 1 is directed to a method for removing iron deposits from the surface
of a closed loop system. The method comprises: (a) contacting the surface of a closed
loop system having iron deposits with an aqueous solution of an oxygen scavenger, and
(b) introducing diethylhydroxylamine and/or di-isopropylhydroxylamine into the closed
loop system at a concentration sufficient to cause the iron deposits to release from the
surface.
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