(19)

(11)

EP 2 665 681 A1

(12)

(43) Date of publication: 27.11.2013 Bulletin 2013/48 (21) Application number: 12702612.8 (22) Date of filing: 19.01.2012

(51) International Patent Classification (IPC):  C01B 31/08(2006.01) A24D 3/16(2006.01) (86) International application number: PCT/GB2012/050117 (87) International publication number: WO 2012/098405 (26.07.2012 Gazette 2012/30)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 20.01.2011 CN 201110022795 (71) Applicant: British American Tobacco (Investments) Limited London WC2R 3LA (GB)	(72) Inventors: LU, An-Hui Dalian 116622 (CN) LI, Wen-Cu Dalian 116622 (CN) BRANTON, Peter London WC2R 3LA (GB) (74) Representative: Gill, Siân Victoria et al Venner Shipley LLP 200 Aldersgate London EC1A 4HD London EC1A 4HD (GB)