Ge Betz, Inc.

Hercules Corporation

Grace B Arhancet

James G Edmondson

Sherif Eldin

A method of inhibiting fouling and viscosity increase in hydrocarbon streams including ethylenically unsaturated monomers is disclosed. The method includes the step of adding to the hydrocarbon stream an effective amount of one or more quinone methides of the formula:wherein R, R, and Rare independently selected from the group consisting of H, &#x2014;OH, &#x2014;SH, &#x2014;NH, alkyl, cycloalkyl, heterocyclo, and aryl.

Inhibition of viscosity increase and fouling in hydrocarbon streams including unsaturation

This invention relates to a process of inhibiting the polymerization of vinyl-containing materials through the use of an effective amount of a polymerization inhibitor comprising quinone diimide and a nitroxyl stable free radical under various conditions. This invention also relates to the polymerization inhibitor composition.

Polymerization inhibitor for vinyl-containing materials

Inhibitor compounds containing a moiety according to this invention are used to inhibit air oxidation and thermal polymerization of furfural or furfural derivatives. A process is provided for use of the inhibitors in the solvent refining of lubricating oils where furfural is used to extract impurities including polycyclic aromatic and oxygen-containing compounds from the lubricating oils. The process provides for combination of the inhibitor with a continuously recirculating furfural stream in the extraction process.

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Creve Coeur, MO, United States of America

Grace B Arhancet