The "Rhineland refinery" was created in 2002 from the merger of german refinery RWE DEA in Wesseling and the Shell refinery in Godorf.
It currently employs 1,600 permanent staff.
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Now operated by Shell Deutschland Oil GmbH, the refinery (both site) has an annual capacity of around 17 million tons and is Germanys largest refinery.
http://en.wikipedia.org/wiki/Royal_Dutch_Shell
Here you can read abote the history (only in german) of "UK Wesseling", a harbinger of RWE DEA:
http://de.wikipedia.org/wiki/Union_Rheinische_Braunkohlen_Kraftstoff_AG