作为一种绿色的溶剂，离子液体被广泛地应用于萃取、富集植物中的天然活性成分。低粘度的功能化离子液体用于萃取这些组分，更有利于萃取剂与被萃取目标物质的分离。在综合前期离子液体研究的基础上，我们根据离子液体的结构和粘度数据，建立相关的定量结构-性质关系（QSPR）模型，对具有特定结构的离子液体进行粘度的预测，方便低粘度离子液体的筛选和合成。将拟合成出的低粘度离子液体与盐构建出离子液体双水相体系，研究体系的相平衡参数。将离子液体双水相体系应用于萃取、分离和纯化麻类作物中的活性成分苎麻绿原酸、亚麻木酚素和罗布麻黄酮，考察温度、pH值等因素的影响，得出最佳工艺条件。同时研究整个过程萃取机理，包括热力学、动力学参数、各种萃取作用力以及物质结合的微观状态等。萃取完成后，对离子液体和盐进行回收利用。该绿色、高效的离子液体双水相体系能为大规模分离和纯化麻类作物活性成分提供理论和实践支持。

As a green solvent, ionic liquids (ILs) are widely used in extraction and preconcentration of native ingredients from plant. Functionalized ionic liquid (FIL) with low viscosity used to extract these constituents has the advantage of easy separation of target materials from the extractant. We construct the model of quantitative structure-property relationship (QSPR) based on the structure of IL and viscosity data. This model can forecast the viscosity of the IL possessing specific structure, making it more convenient for screening and synthetizing the IL with low viscosity. A serial of ILs with low viscosity will be synthesized and then used to construct aqueous two-phase system (ATPS), the phase equilibrium parameters of ATPS are studied. The ATPS will be used to extract and purify active ingredients of chlorogenic acid (CGA) in ramie, lignan in flax and flavonoids in kender. The influencing parameters of temperature and pH are investigated to obtain the optimal technological conditions. The extraction mechanisms of kinetics, thermodynamics, acting force, microstate et al. are investigated. After extraction being finished, IL and salt are recycled. This green and efficient IL-ATPS can provide theoretical and practical support for separation and purification of active ingredients in bast fiber crop in scale-up production.