(19)

(11)

EP 2 217 846 A1

(12)

(43) Date of publication: 18.08.2010 Bulletin 2010/33 (21) Application number: 08840272.2 (22) Date of filing: 14.10.2008

(51) International Patent Classification (IPC):  F17C 3/00(2006.01) (86) International application number: PCT/EP2008/008853 (87) International publication number: WO 2009/049908 (23.04.2009 Gazette 2009/17)

(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 Designated Extension States: AL BA MK RS (30) Priority: 18.10.2007 IT MI20072022 (71) Applicant: ENI S.p.A. 00144 Rome (IT)	(72) Inventors: MOLINO, Katia I-20136 Milan (IT) TAGLIA, Antonio I-20125 Milan (IT) (74) Representative: De Gregori, Antonella et al Ing. Barzano' & Zanardo Milano S.p.A. Via Borgonuovo 10 20121 Milano 20121 Milano (IT)