Ashland, Inc.

Frank L M De Cordt

Bruce L Libutti

Kostan B Charkhutian

John S Ruffini

Martti Samuli Ahom&auml;ki

This invention relates to a process for inhibiting scale and fouling on metal surfaces exposed to an aqueous system, particularly a circulating aqueous system. The process comprises adding glutamic acid N,N diacetic acid, or salts thereof, to the aqueous system. Glutamic acid N,N diacetic acid, or salts thereof, act as a chelating agent and is biodegradable. The process is particularly useful for inhibiting the formation of scale and fouling on metal surfaces of steam generating and cooling systems.

Process for inhibiting scale and fouling on the metal surfaces exposed to an aqeuous system

This invention relates to compositions, which are useful in removing dissolved oxygen from a fluid stream, preferably an aqueous stream. The compositions comprise blend of an oxime and a primary hydroxylamine. This invention also relates to a process for removing oxygen from an aqueous system, which comprises adding an oxime and a primary hydroxylamine to a fluid system.

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Ranst, Belgium

Frank L M De Cordt