Hydrazones as oxygen scavengers in boiler water systems

Details Hydrazones as oxygen scavengers in boiler water systems Hydrazones as oxygen scavengers in boiler water systems

1993-11-04

1995-01-24

Hruskoci, Peter A.

Liquid purification or separation

Processes

Chemical treatment

210757, 25218828, 252390, 422 16, C02F 120

Patent

active

053840500

ABSTRACT:
A method of removing dissolved oxygen from boiler water having and alkaline pH is disclosed. The method uses at least one hydrazone compound of one of the following formulae: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from hydrogen, C.sub.1 -C.sub.16 alkyl, aryl, substituted alkyl or substituted aryl, and R.sup.5 and R.sup.6 are independently selected from hydrogen, C.sub.1 -C.sub.16 alkyl, aryl, substituted alkyl, or substituted aryl, ##STR2## Preferably, an oxidation-reduction catalyst such as Cu(II) is used as well. The hydrazones used in the present invention are highly shelf stable and do not suffer the toxicity of hydrazine.

REFERENCES:
patent: 3043888 (1962-07-01), Pray et al.
patent: 3876371 (1975-04-01), Costain et al.
patent: 4269717 (1981-05-01), Slovinsky
patent: 4469609 (1984-09-01), Bandlish et al.
patent: 4479917 (1984-10-01), Rothgery et al.
patent: 4540494 (1985-09-01), Fuchs et al.
patent: 5258125 (1993-11-01), Kelley et al.
Kirk-Othmer Encyclopedia of Chemical Technology, Second Edition, Interscience Publishers, vol. 11, p. 187.

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