4-ALKYLSEMICARBAZIDE AS DEOXIDIZER

PROBLEM TO BE SOLVED: To provide a treatment method for removing oxygen by which oxygen is removed under ordinary service conditions of a boiler, the rate of corrosion of steel surface is reduced and on the other hand, a possibility of exposure to hydrazing is reduced. SOLUTION: When dissolved oxyge...

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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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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a treatment method for removing oxygen by which oxygen is removed under ordinary service conditions of a boiler, the rate of corrosion of steel surface is reduced and on the other hand, a possibility of exposure to hydrazing is reduced. SOLUTION: When dissolved oxygen is removed from dissolved oxygen-contg. alkaline water at >=250 deg. F, water-soluble semicarbazide represented by formula (where R1 and R2 are selected from a group comprising 1-10C alkyl, cycloalkyl, aryl, cycloalkyloxy and alkyloxy) is added to the alkaline water by an amt. effective for removing the dissolved oxygen. The pref. semicarbazide is 4- phenylsemicarbazide, 4-isopropylsemicarbazide, 4,4-diethylsemicarbazide or carbazoyl morpholine. In the case of