Chevron Phillips Chemical Company LP

Conocophillips Company

Tin Tack Peter Cheung

Marvin M Johnson

Glenn W Dodwell

Larry E Reed

Richard L Anderson

Scott H Brown

Charles John Lord, Iii

John Cruze

Kenneth C McCarley

A xylene isomerization process includes introducing gas comprising hydrogen and a base to a reaction zone in which a catalyst comprising a Group VIII metal and a zeolite support resides. In one embodiment, the base may be formed in situ within the reaction zone from nitrogen and hydrogen that are introduced to the reaction zone. In another embodiment, the base is introduced directly to the reaction zone. The conditions in the reaction zone are effective to reduce the catalyst. A stream comprising Caromatics, e.g., xylenes and ethylbenzene may then be fed to the reaction zone containing the reduced catalyst. The reaction zone may be operated at conditions effective to isomerize the xylenes and hydrodealkylate the ethylbenzene. The xylene loss during the isomerization of the xylenes is lowered as a result of using the catalyst reduced in the presence of the gas comprising a base and hydrogen.

Methods of isomerizing xylenes with a catalyst reduced in the presence of hydrogen and a base

A process for removing selenium from an aqueous stream using a supported sulfur material, and optionally the addition of an activating agent for enhanced removal of selenite, is disclosed.

Selenium removal process

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Kingwood, TX, United States of America

Tin Tack Peter Cheung