(19)

(11)

EP 3 215 458 A1

(12)

(43) Date of publication: 13.09.2017 Bulletin 2017/37 (21) Application number: 15797214.2 (22) Date of filing: 03.11.2015

(51) International Patent Classification (IPC):  C01B 3/38(2006.01) C07C 29/151(2006.01) C25B 1/04(2006.01) (86) International application number: PCT/US2015/058859 (87) International publication number: WO 2016/073500 (12.05.2016 Gazette 2016/19)

(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 Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 03.11.2014 US 201462074454 P (71) Applicant: Ztek Corporation Woburn, MA 01801 (US)	(72) Inventor: HSU, Michael, S. Woburn, MA 01888-1970 (US) (74) Representative: Romano, Giuseppe  Società Italiana Brevetti S.p.A Piazza di Pietra, 39 00186 Roma 00186 Roma (IT)