(19)

(11)

EP 2 132 287 A1

(12)

(43) Date of publication: 16.12.2009 Bulletin 2009/51 (21) Application number: 08718839.7 (22) Date of filing: 20.03.2008

(51) International Patent Classification (IPC):  C10M 163/00(2006.01) F01M 5/00(2006.01) C10N 20/02(2006.01) C10N 30/04(2006.01) C10M 177/00(2006.01) C10N 10/04(2006.01) C10N 30/02(2006.01) C10N 40/26(2006.01) (86) International application number: PCT/GB2008/001002 (87) International publication number: WO 2008/119936 (09.10.2008 Gazette 2008/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (30) Priority: 30.03.2007 EP 07251415 12.06.2007 EP 07252371 (71) Applicant: BP p.l.c. London SW1Y 4PD (GB)	(72) Inventors: HARROLD, Paul, Andrew Derby DE22 2UU (GB) LIDDY, John, Philip Middlesex TW18 3JA (GB) LIM, Kok-Chye Chelshire CW6 0PY (GB) (74) Representative: Perkins, Nicholas David  BP International Limited Patents and Agreements Division, Chertsey Road Sunbury-on-Thames, Middlesex TW16 7LN Sunbury-on-Thames, Middlesex TW16 7LN (GB)