CALIX (4) ARENES-BIS-CROWNS, PROCESS FOR THEIR PREPARATION AND THEIR USE FOR SEPARATING CESIUM FROM SODIUM IN AQUEOUS EFFLUENTS BY NANOFILTRATION

摘要

Calix(4)arene-bis-crown compounds of formula (I) are new. Calix(4)arene-bis-crown compounds of formula (I) are new. R1, R2 = -X(CH2CH2X)m- (II), -X(CH2CH2X)n-Y-X(CH2CH2X)n- (III), -XCH2CH2X-(YX)p-CH2CH2X- (IV) or -XCH2CH2X(YXCH2CH2X)p- (V); X = -O-, -S-, -NH- or -N(CH3)-; Y = cycloalkylene or arylene; m = 3-6; n = 1-3; p = 2-3; R3 = H, OH, OR4, COOH or COOR4, provided at least two R3 differ from H; and R4 = alkyl, optionally including one or more O atoms. Independent claims are also included for the preparation and use of these compounds.