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(11)

EP 4 739 413 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24743440.0 (22) Date of filing: 02.07.2024

(51) International Patent Classification (IPC):  B01D 1/28(2006.01) B01D 3/14(2006.01) B01D 3/40(2006.01) C07C 53/08(2006.01) B01D 3/00(2006.01) B01D 3/36(2006.01) C07C 53/02(2006.01) C07D 307/48(2006.01) (52) Cooperative Patent Classification (CPC): B01D 1/2856; B01D 3/143; B01D 3/007; B01D 3/36; B01D 3/40; C07D 307/48 (86) International application number: PCT/FI2024/050369 (87) International publication number: WO 2025/008572 (09.01.2025 Gazette 2025/02)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 03.07.2023 FI 20235786 (71) Applicant: Chempolis Oy 90660 Oulu (FI)	(72) Inventors: KANTOMAA, Juhani 90660 Oulu (FI) ANTTILA, Juha Rainer 90660 Oulu (FI) (74) Representative: Kolster Oy Ab  Salmisaarenaukio 1 P.O. Box 204 00181 Helsinki 00181 Helsinki (FI)