羟基功能化离子液体体系用于盐湖卤水提硼  

Boron Extraction from Salt Lake Brine by Hydroxyl Functionalized Ionic Liquid System

作　　者：李阳阳[1,2,3] 朱朝梁 邓小川 史一飞 樊发英 樊洁 LI Yang-yang;ZHU Chao-liang;DENG Xiao-chuan;SHI Yi-fei;FAN Fa-ying;FAN Jie(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Engineering and Technology Research Center of Salt Lake Resources Development,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院青海盐湖所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源开发工程技术研究中心,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《盐湖研究》2021年第3期76-82,共7页Journal of Salt Lake Research

基　　金：国家自然科学基金资助项目(21571184)。

摘　　要：溶剂萃取法是目前工业应用前景广阔的盐湖卤水提硼方法,而萃取分离的核心在于萃取剂的选择。以异辛醇、羟基功能化离子液体1-羟乙基-3-甲基咪唑双(三氟甲磺酰)亚胺盐([HOEMIm]NTf_(2))按体积比混合组成萃取剂,乙酸丁酯为稀释剂,对东台吉乃尔盐湖酸化卤水进行萃取提硼的实验研究。对[HOEMIm]NTf_(2)体积分数、相比、萃取时间、萃取温度、酸化卤水pH、饱和萃取容量、反萃剂pH、反萃相比及反萃级数等进行实验研究。获得了合适的工艺条件,三级萃取后硼萃取率可达99.3%,饱和硼萃取容量为28.9 g·L^(-1)(以H_(3)BO_(3)计),三级反萃后硼反萃率为99.7%。萃取体系乳化程度小,循环性能良好。Solvent extraction is a potential industrialized technology for boron recovery from brine.The core of extraction separation lies in the selection of extractant.Extraction of boron in acidified brine from East Taijinar Salt Lake was investigated by using isooctanol and hydroxyl functionalized ionic liquid 1-hydroxyethyl-3-methylimidazole bis((trifluoromethyl)sulfonyl)imide([HOEMIm]NTf_(2))as mixed extractant,butylacetate as diluent.The experimental conditions including volume fraction of[HOEMIm]NTf_(2),phase ratio,extraction time,extraction temperature,pH of acidified brine,saturated extraction capacity,pH of stripping agent,stripping phase ratio and stripping extraction stages were investigated.At the suitable conditions,the extraction efficiency of boron can reach 99.3%with three stages extraction,the saturated extraction capacity is 28.9 g·L^(-1)(calculated by H_(3)BO_(3)),and the three stages stripping extraction rate is 99.7%.Besides,the extraction system has low emulsification and good cycling performance.

关 键 词：离子液体 异辛醇 萃取提硼 

分 类 号：TS396.5[轻工技术与工程]