4-alkyl semicarbazides as oxygen scavengers

A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250 DEG 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...

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Bibliographische Detailangaben
1. Verfasser:	BAILEY, BRUCE, R
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHINBOILERS BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CONTROLLING WATER LEVEL DIFFUSION TREATMENT OF METALLIC MATERIAL FEED-WATER SUPPLY HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER STEAM GENERATION THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE WEAPONS
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Beschreibung
Zusammenfassung:	A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250 DEG 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 wherein R1 and R2 are selected from the group consisting of C1 - C10 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 DEG F, a catalyst is also required.