(19)

(11)

EP 3 921 456 A1

(12)

(43) Date of publication: 15.12.2021 Bulletin 2021/50 (21) Application number: 20703362.2 (22) Date of filing: 14.01.2020

(51) International Patent Classification (IPC):  C25B 1/02(2006.01) C25B 13/04(2021.01) C25B 3/02(2006.01) (52) Cooperative Patent Classification (CPC): C25B 13/04; C25B 1/02; C25B 3/23 (86) International application number: PCT/US2020/013452 (87) International publication number: WO 2020/163047 (13.08.2020 Gazette 2020/33)

(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: KH MA MD TN (30) Priority: 06.02.2019 US 201962801946 P 12.03.2019 EP 19162341 (71) Applicant: ExxonMobil Research and Engineering Company Annandale, NJ 08801-0900 (US)	(72) Inventors: LARSON, Robert, B. Houston, TX 77098 (US) McCOOL, Benjamin, A. Annandale, NJ 08801 (US) (74) Representative: ExxonMobil Chemical Europe Inc.  IP Law Europe Hermeslaan 2 1831 Machelen 1831 Machelen (BE)