Compounds of the formula ##STR1## in which; X represents a straight chain hydrocarbyl group containing from 8 to 17 carbon atoms; Y represents H or the group--CH.dbd.NOH, and Z represents H or the group--CH.dbd.NOH or the group--CPh.dbd.NOH, provided that at least one of Y and Z represents H; or such compound containing at least one electronegative substituent in the aromatic ring, may be prepared from anacardic acid and its analogues, and are useful for the extraction of copper from acidic aqueous solution. Cardanol, which has the formula ##STR2## where n=0, 2, 4 or 6 is recovered from cashew nut shell liquid containing cardol and other dihydric phenols by reacting the dihydric phenols in the CNSL with an aldehyde while leaving the cardanol substantially unreacted, and vacuum distilling the cardanol from the reaction mixture.
公式为##
STR1##的化合物,其中:X代表含有8到17个
碳原子的直链烃基;Y代表H或基团--CH.dbd.NOH,Z代表H或基团--CH.dbd.NOH或基团--
CPh.dbd.NOH,但至少其中一个为H;或者该化合物在芳香环中含有至少一个电负取代基,可以由腰果酸及其类似物制备,用于从酸性
水溶液中提取
铜。卡豆
酚,
化学式为##
STR2##,其中n=0、2、4或6,通过将CNSL中含有卡豆
酚和其他双
酚的物质与醛反应,同时使卡豆
酚基本不发生反应,并从反应混合物中真空蒸馏卡豆
酚来回收。