(19)

(11)

EP 4 161 875 A1

(12)

(43) Date of publication: 12.04.2023 Bulletin 2023/15 (21) Application number: 20940367.4 (22) Date of filing: 09.06.2020

(51) International Patent Classification (IPC):  C01D 15/00(2006.01) B01D 61/14(2006.01) (52) Cooperative Patent Classification (CPC): B01D 61/14; B01D 61/16; B01D 2311/12; B01D 2311/04; B01D 71/022; B01D 2311/18; B01D 2311/25; B01D 2315/06; B01J 39/02; B01J 39/09; B01J 49/53; B01D 15/361; B01D 15/16; C01D 15/04; C01P 2006/80; C01P 2004/51; C01P 2004/61; Y02P 10/20 (86) International application number: PCT/CA2020/000069 (87) International publication number: WO 2021/248221 (16.12.2021 Gazette 2021/50)

(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: 08.06.2020 US 202016895783 (71) Applicant: Standard Lithium Ltd. Vancouver, British Columbia V6C 3E8 (CA)	(72) Inventor: BROWN, Craig Johnstone Pickering, Ontario L1W 3N9 (CA) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)