Use of aminophenol compounds as oxygen scavengers in an aqueous medium
AssigneeBetz Laboratories, Inc.
InventorJohn A. Muccitelli
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Abstract
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium comprising adding to the medium an effective amount of a hydrazine-free aqueous solution of an aminophenol compound or acid salt thereof having the formula ##STR1## where a=1, 2, or 3; b is 0 or 1 and x=amino or alkylamino (C1-C4).
Claims22
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium comprising adding to said medium an effective amount of a hydrazine-free aqueous solution of an aminophenol compound or acid addition salt thereof having the formula:
- ##STR6## wherein a=1, 2, or 3;
- b is 0 or 1;
- and
- X=amino or alkylamino wherein the alkyl group is C.sub.1 -C.sub.4.
A method for reducing the amount of oxygen in oxygen containing feedwater to a boiler comprising added to said feed-water an effective amount for the purpose of a hydrazine-free aqueous solution of an aminophenol compound or acid addition salt thereof having the formula:
- ##STR7## wherein a=1, 2, or 3;
- b=0 or 1;
- and
- X=amino or alkylamino, wherein the alkyl group is C.sub.1 -C.sub.4.
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium comprising adding to said medium an effective amount of a hydrazine-free aqueous solution of a compound selected from the group consisting of p-aminophenol;
- 2,4-diaminophenol dihydrochloride;
- 5-Methyl-o-aminophenol;
- o-aminophenol;
- 3-Methyl-p-aminophenol;
- and mixtures thereof.
A method for control of corrosion of metal surfaces in a boiler system caused by dissolved oxygen in the water, which comprises adding to the said system an effective amount of an aminophenol compound or acid addition salt thereof having the formula:
- ##STR8## in which R is OH, R.sub.1 is amino or lower alkyl amino wherein the alkyl group is C.sub.1 -C.sub.4, and
- R.sub.2 is methyl;
- said aminophenol compound or acid addition salt thereof being the sole scavenger present.
Dependencies are inferred from the claim text.