Chemistry of hydrocarbon compounds – Aromatic compound synthesis – Having alkenyl moiety – e.g. – styrene – etc.
Reexamination Certificate
2005-08-30
2005-08-30
Dang, Thuan D (Department: 1764)
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
Having alkenyl moiety, e.g., styrene, etc.
C585S440000
Reexamination Certificate
active
06936743
ABSTRACT:
Disclosed is a method for extending the life of dehydrogenation catalysts used to prepare vinyl aromatic hydrocarbons. The catalysts, which typically include both iron oxide and potassium containing catalysis promoter, are exposed to additional potassium delivered using a potassium carboxylate. The potassium carboxylates are desirably free of halogens and other catalysts poisons or groups that could result in the undesirable properties in vinyl aromatic hydrocarbons produced therewith. The present invention is particularly useful with the production of styrene and methyl styrene.
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http://www.cheresources.com/polystymonzz.shtml;Styrene Monomer Production(Dow Process).
Dang Thuan D
Fina Technology, Inc.
Krueger Tenley R.
Madan Mossman & Sriram
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