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Sep 2, 2011 -- The Alkylation Unit with a capacity of 45 metric tonne per day combines isobutane and the light ends (butanes and propylenes) in the presence of sulphuric acid catalyst to produce alkylate, a gasoline blending component. A Sulphuric Acid Regeneration Unit regenerates the spent sulphuric acid catalyst and supplies the regenerated acid back to the Alkylation Unit. (Source: sulphuric-acid.com > Acid Plant Database > Singapore Refining Company)

Aug 14, 1995 -- Sulfuric acid alkylation Unit licensed by Stratco Inc. (Source: Anne K. Rhodes, Two of Singapore's refiners expand despite lack of land, Oil&Gas Journal).

Note: it is not known if the alkylation unit capacity was debottleneck or expanded since 2011.