Betzdearborn, Inc.

J Frederick Martin

Paul V Roling

Graciela B Arhancet

Inge K Henrici

Quincy K Sintim

In the thermal processing of crude alkanolamines, a method of inhibiting color formation in the alkanolamines comprising adding an amount, effective for the purpose, of an alkali metal hydroxide or sulfite, or mixtures thereof.

Inhibitors of color formation in alkanolamines

Compositions and methods for inhibiting vinyl aromatic monomer polymerization during processing are disclosed. The compositions comprise a dinitrosalicylic acid derivative and a hydroxylamine compound. The methods comprise adding the composition to the monomer during processing. The preferred composition comprises 3,5-dinitrosalicylic acid or 3,5-dinitrosalicylic methyl ester and bis-(hydroxypropyl)hydroxylamine.

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Conroe, TX, United States of America

J Frederick Martin