The extraction properties of mono-hydroxy alcohols (2-butyl-1-octanol, 2-ethyl-1-hexanol, 1-octanol) and di-hydroxy alcohols (2-ethyl-1,3-hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-2,4-pentanediol) towards boron, potassium, lithium, sodium, calcium and magnesium ions were investigated as a function of pH and phase volume ratio (O/A) by considering an aqueous phase with a composition mimicking the brine from the Salar de Hombre Muerto in Argentina, in the Lithium Triangle. The mono-hydroxy alcohols are soluble in kerosene and sulfonated kerosene whereas the di-hydroxy alcohols are only soluble in mixtures of kerosene and toluene or -xylene. No significant effect of the diluent on the extraction properties is observed. All alcohols exhibit high selectivity for boron over potassium, lithium, sodium, calcium and magnesium at acidic pH (pH = 1–5.5). A significant decrease of the extraction efficiency of boron by the mono-hydroxy alcohols is observed at pH >5.5 while no significant decrease of the extraction efficiency occurs with di-hydroxy alcohols. Finally, the best conditions to selectively extract boron from the synthetic brine with 1 mol L mono-hydroxy alcohols or di-hydroxy alcohols at 35 °C are pH = 5.5 and O/A = 4 when the diluent is kerosene and O/A = 2 when the diluent is a mixture of kerosene and toluene.

中文翻译：

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用脂肪族一元醇和二元醇从代表性大陆盐水中萃取硼

一元醇（2-丁基-1-辛醇、2-乙基-1-己醇、1-辛醇）和二元醇（2-乙基-1,3-己二醇、2-丁基-2 -乙基-1,3-丙二醇、2-甲基-2,4-戊二醇）对硼、钾、锂、钠、钙和镁离子的影响作为 pH 值和相体积比 (O/A) 的函数，通过考虑水相的成分模仿了阿根廷锂三角地区 Salar de Hombre Muerto 的盐水。一元醇可溶于煤油和磺化煤油，而二元醇仅可溶于煤油和甲苯或二甲苯的混合物。没有观察到稀释剂对萃取特性的显着影响。在酸性 pH 值（pH = 1–5.5）下，所有醇对硼的选择性均高于钾、锂、钠、钙和镁。当 pH > 5.5 时，观察到一元醇对硼的萃取效率显着降低，而二元醇的萃取效率没有显着降低。最后，在35℃下用1 mol·L一元醇或二元醇从合成盐水中选择性萃取硼的最佳条件是当稀释剂为煤油且O/A = 4时，pH = 5.5和O/A = 4。 2当稀释剂是煤油和甲苯的混合物时。