Betzdearborn, Inc.

Betz Laboratories, Inc.

Michael A Cady

Sydia B Anderson

David W Reichgott

Roger C May

Anita G Monino

William S Carey

Ljiljana V Minevski

Alan E Goliaszewski

Paul R Burgmayer

Andrew Solov

Longchun Cheng

Roger D Moulton

The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Specific isomers of chloro-methylbenzotriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Methods of inhibiting corrosion using isomers of

The corrosion of metals in contact with aqueous alkanolamine solution in acid gas removal units is inhibited by maintaining in the alkanolamine solution a corrosion inhibiting amount of a thiodialkanol. The thiodialkanol is useful for inhibiting the corrosion of metals in both the acid gas rich and lean portions of the acid gas removal unit.

Corrosion inhibitor for alkanolamine units

The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

Methods of inhibiting corrosion using halo-benzotriazoles

A method of preparing halo-benzotriazoles is disclosed. The method involves mixing an aqueous solution of sodium hypohalite with an aqueous slurry or suspension of a benzotriazole. Preferred sodium hypohalites are sodium hypochlorite or sodium hypobromite and the preferred benzotriazole is tolyltriazole.

A method of preparing poly(isopropenylphosphonic acid) is disclosed, which provides a high yield with low initiator charge. The method comprises preparing poly(isopropenylphosphonic acid) by polymerizing a mixture of isopropenylphosphonic acid and isopropenylphosphonic acid anhydride, preferably in an aqueous solution.

Aqueous polymerization method for poly(isopropenylphosphonic acid)

An improved oxygen scavenger for aqueous mediums is disclosed which is a disubstituted, water soluble azo compound.

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Yardley, PA, United States of America

Michael A Cady