(19)

(11)

EP 0 989 908 A2

(12)

(88) Date of publication A3: 27.05.1999 (43) Date of publication: 05.04.2000 Bulletin 2000/14 (21) Application number: 98931364.8 (22) Date of filing: 18.06.1998

(51) International Patent Classification (IPC)7: B01J 29/00 (86) International application number: PCT/US9812/703 (87) International publication number: WO 9857/743 (23.12.1998 Gazette 1998/51)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 18.06.1997 US 50144 P (71) Applicant: EXXON CHEMICAL PATENTS INC. Baytown, TX 77520-5200 (US)	(72) Inventor: SUN, Hsiang-ning Houston, TX 77005 (US) (74) Representative: Dew, Melvyn John et al Exxon Chemical Europe Inc.P.O.Box 105 1830 Machelen 1830 Machelen (BE)