Oxygen scavenger and the method for oxygen reduction treatment
AssigneeKurita Water Industries Ltd.
InventorsYukimasa Shimura, Junichi Takahashi
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Abstract
Oxygen scavenger which can exhibit excellent oxygen reduction effect in a wide variety of conditions is provided as an alternative volatile oxygen scavenger to hydrazine. The oxygen scavenger contains a heterocyclic compound having N-substituted amino group such as 1-amino-4-methylpiperazine and a hydroxylamine compound such as N,N-diethylhydroxylamine. The oxygen scavenger may further contain a polyhydric phenol type catalyst such as pyrogallol. By adding the oxygen scavenger to feed water of a water system of a boiler, oxygen reduction treatment of the water system is carried out.
Claims9
An oxygen scavenger consisting essentially of at least one heterocyclic compound having an N-substituted amino group selected from the group consisting of N-aminomorpholine, 1-amino-4-methylpiperazine, N-aminohexamethyleneimine, 1-aminopyrrolidine, and 1-aminopiperidine, at least one hydroxylamine compound including N, N-diethylhydroxylamine with a weight ratio (A/B) of a content of the heterocyclic compound (A) and a content of the hydroxylamine compound (B) being in a range of from 0.1 to 10.
An oxygen scavenger consisting essentially of at least one heterocyclic compound having an N-substituted amino group selected from the group consisting of N-aminomorpholine, 1-amino-4-methylpiperazine, N-aminohexamethyleneimine, 1-aminopyrrolidine, and 1-aminopiperidine, and at least one hydroxylamine compound including N,N-diethylhydroxylamine and a polyhydric phenol catalyst.
Dependencies are inferred from the claim text.