BOPI 04 BR/2024 REPERTOIRE NUMERIQUE 14 Formula I & Fig. 1 ________________________________________ (11) 21485 Consulter le mémoire (51) B01D 61/02 (2018.01); C01B 25/234 (2018.01) (21) 1202200528 - PCT/EP2021/065923 (22) 14/06/2021 (30) EP n° 20180333.5 du 16/06/2020 (54) Process for purifying a phosphate containing acidic solution comprising impurities and apparatus for applying same. (72) SONVEAUX, Marc (BE) (73) PRAYON, Rue Joseph Wauters 144, 4480 ENGIS (BE) (74) Cabinet Spoor & Fisher Inc. Ngwafor & Partners, The House of Gideon, Golf/Bastos Quater, Opposite The American Embassy, Entrance-Saint John Paul II Boulevard, P.O. Box 8211, YAOUNDE (CM). (57) The present invention concerns a process and an apparatus for purifying a phosphate containing acidic solution (P1) comprising impurities through a nanofiltration station (2) comprising a number of nanofiltration membrane units (M1 - Mn, Mr1, Mr2, Me1, Me2), each comprising a retentate side (RS) and a permeate side (PS) separated by a membrane, the process comprising feeding the phosphate containing acidic solution (P1) through an entry line (1e) to a first membrane unit (M1) of n > 1 membrane units (M1 - Mn) arranged in series, wherein a nth permeate (Ppn) flowing out of the nth membrane unit forms a nanofiltered phosphate solution (P2). The gist of the present invention is the provision of at least one permeate recirculation loop, branching off the RS of the first membrane unit (M1) and closing the loop at the entry line (1e) to combine at least one of three permeates (Ppr1, Ppr2, Ppe1) with the phosphate containing acidic solution (P1), wherein the three permeate recirculation loops consist of,• a first recovery recirculation loop starting from the RS of the first membrane unit (M1) in fluid communication with the RS of a first recovery membrane unit (Mr1), and the PS of the first recovery membrane unit (Mr1) being in fluid communication with the entry line (1e),• a first exit recirculation loop starting from the RS of the first membrane unit (M1) in fluid communication with the RS of the first recovery membrane unit (Mr1), and the PS of the first recovery membrane unit (Mr1) being in fluid communication with RS of a first exit membrane unit (Me1), whose PS is in fluid communication with the entry line (1e), and• a second recovery recirculation loop starting from the RS of the first membrane unit (M1) in fluid communication with the RS of the first recovery membrane unit (Mr1), which is also in fluid communication with the RS of a second recovery membrane unit (Mr2), whose PS is in fluid communication with the entry line (1e).
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