Betz Laboratories, Inc.

Other

John A Muccitelli

Nancy A Feldman

Stanley J Ciuba

A method is disclosed for reducing the oxygen content of water using a hydrazine-free dioxo aromatic compound or organically-substituted derivative thereof.

Dioxo-aromatic compounds as oxygen scavengers

The present invention utilizes low volatility amines or alkanol amines to control caustic corrosion which can take place when a boiler system, treated with a coordinated phosphate/pH program, is 'out of control'. N-substituted hydroxyalkyl piperazines are also capable of mitigating caustic corrosion in coordinated phosphate/pH programs. Combinations of the compounds of the present invention and phosphate have also been shown to be efficacious at mitigating caustic corrosion in coordinated phosphate/pH programs.

Method for mitigation of caustic corrosion in coordinated phosphate/ph

A method for monitoring and controlling the blowdown rate and chemical feed rate to a high pressure boiler involving the measurement of certain parameters including operating temperature, conductivity at operating temperature, temperature and pH of cooled boiler water, and then carrying out calculations to determine the estimated treatment chemical concentration and estimated boiler water conductivity, noting the critical conductivity ratio (CCR), noting the observed maximum tolerable high temperature conductivity value and comparing the relative conductivity ratio (RCR) with the critical conductivity ratio (CCR) and the value of the electrolytic conductivity of the boiler water at operating temperature (K) with the maximum tolerable high temperature conductivity value (M), followed by making any necessary adjustments to the chemical feedrate and diagonal or blowdown rate depending upon aforesaid comparison.

Monitoring and controlling AVT (all volatile treatment) and other

An electrode assembly and a method of electrically insulating the electrode assembly for in-situ measurement of electrolytic conductivity of boiler or other hot alkaline or neutral water, the electrode assembly comprising calcia/hafnia stabilized zirconia wherein the calcia is present from 3 to 10% by weight and the hafnia is present from 0.5 to 6% by weight.

Electrode assembly for in-situ measurement of electrolytic conductivity

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;

Use of aminophenol compounds as oxygen scavengers in an aqueous medium

Compositions and methods for chemically scavenging oxygen from an aqueous medium are disclosed. Salicylaldehyde catalyzed by hydroquinone can be used as an oxygen scavenger in any aqueous medium, but is especially well adapted for use in boiler water systems.

Hydroquinone catalyzed oxygen scavenger and methods of use thereof

Stable oxygen scavenger compositions adapted for storage without resulting in substantial sludge formation and oxygen scavenging methods of using the compositions are disclosed. The compositions comprise hydroquinone, a compatible amine termed a mu-amine, and a member selected from the group consisting of isoascorbic acid and ascorbic acid and water soluble salt forms thereof. Methods comprise adding from about 0.05-200 ppm hydroquinone, 0.001-400 ppm mu-amine, and about 0.00025-500 ppm of isoascorbic or ascorbic acid to the desired aqueous medium.

Method of utilizing improved stability oxygen scavenger compositions

Compositions and methods for chemically scavenging oxygen from an aqueous medium are disclosed. Furfural catalyzed by hydroquinone can be used as an oxygen scavenger in any aqueous medium, but is especially well adapted for use in boiler water systems.

An improved oxygen scavenger for aqueous mediums is disclosed which comprises hydrazine-free solution of hydroquinone and mu-amine.

Hydroquinone oxygen scavenger for use in aqueous mediums

An improved oxygen scavenger for aqueous mediums is disclosed which comprises hydrazine-free solution of hydroquinone and mu-amine. Representative examples of mu-amines include: aminomethylpropanol, triethylenetetramine, diisopropanolamine, secbutylamine, monoisopropanolamine, ethylenediamine, dimethylaminopropylamine, monoethanolamine, dimethyl(iso)propanolamine, methoxypropylamine, and diethylaminoethanol.

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Feasterville, PA, United States of America

John A Muccitelli