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化工学报  2012 

1,3-二元脂肪醇萃取硼酸的平衡特性

DOI: 10.3969/j.issn.0438-1157.2012.11.024, PP. 3546-3552

Keywords: 硼酸,盐湖卤水,溶剂萃取,1,3-二元脂肪醇,2-乙基-1,3-己二醇,2-丁基-2-乙基-1,3-丙二醇

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Abstract:

基于1,3-二元脂肪醇的溶剂萃取法在盐湖卤水提硼方面有广阔的应用前景,系统研究了两种1,3-二元脂肪醇萃取剂:2-乙基-1,3-己二醇(EHD)和2-丁基-2-乙基-1,3-丙二醇(BEPD)对硼酸的萃取性能,分别考察了萃取剂浓度、原料液pH、硼酸浓度、氯化镁浓度以及温度等因素对硼酸分配系数的影响。实验结果表明,温度为303.15K,原料液中硼酸浓度为0.0185mol·L-1,EHD和BEPD甲苯溶液中浓度均为0.4mol·L-1时,硼酸的分配系数分别达到9.43和8.25。高浓度的萃取剂和较低的原料液pH条件对提高分配系数有利;分配系数随原料中硼酸浓度和反应温度的升高而降低,1,3-二元脂肪醇萃取硼酸的过程为放热过程;氯化镁存在下的盐析效应也有利于硼酸的萃取分配。

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