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Sources say Valero is overhauling the FCCU at Tennessee refinery.

Valero Energy Corporation is overhauling its gasoline-producing Fluidic Catalytic Cracking Unit (FCCU) in Memphis, Tennessee, according to people familiar with the plant's operations.

Valero's spokesperson was unavailable to comment on the refinery operation Thursday.

Sources said that the 65,000 bpd FCCU and the 12,000 bpd unit of alkylation were shut down over the weekend for an overhaul.

Sources said that the overhaul should be completed by November 1.

Sources claim that the refinery's flaring gas recovery unit and hydrotreater were also taken off production to change a catalyst.

The FCCU converts gas oil to unfinished gasoline using a fine powder silica catalyst.

Alkylation units are used to convert refinery byproducts into liquids that boost the octane of unfinished gasoline.

The flare gas collection unit collects the gases that would have been burned in the refinery’s safety flare system and uses them as fuel for boilers.

In order to comply with U.S. Environmental Rules, hydrotreaters remove sulfur from motor gasoline using catalysts and hydrogen. (Reporting and editing by Himani Sarkar, Chris Reese, and Erwin Seba)

(source: Reuters)