4-alkyl and aryl semicarbazides as oxygen scavengers

Details 4-alkyl and aryl semicarbazides as oxygen scavengers 4-alkyl and aryl semicarbazides as oxygen scavengers

1997-04-17

1999-05-18

Hruskoci, Peter A.

Liquid purification or separation

Processes

Chemical treatment

210757, 25218828, 252392, 422 16, C02F1/20

Patent

active

059048573

ABSTRACT:
A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250.degree. F. which comprises the step of: adding to said alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble semicarbazide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of C.sub.1 -C.sub.10 alkyl, cycloalkyl, aryl, cycloalkyloxy and alkyloxy groups.
Preferred materials are 4-phenyl semicarbazide, 4-isopropyl semicarbazide, 4-4-diethyl semicarbazide and carbazoyl morpholine. Below 400.degree. F., a catalyst is also required.

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