Abstract: Both traditional water extraction and solvent extraction to extract bitumen from oil sands have their drawbacks，such as sand/clay entraining into bitumen and bitumen remaining in residual sands. To resolve these problems，an ionic liquid （[Emim]BF4） was used to enhance bitumen recovery from Canadian oil sands by methyl acetate/n-heptane. FTIR and SEM were used to qualitatively analyze the cleanliness of bitumen and residual sand. Quantitative results of fine sand/clay in bitumen and organic matter remaining in residual sand were also obtained by coupling SEM with Elementar and ICP. The optimal volume ratio of methyl acetate to n-heptane was 2∶3. Meanwhile [Emim]BF4 increased bitumen recovery ratio to 94.20%，7.92% higher than composite solvent extraction without [Emim]BF4. The results obtained from FTIR，SEM，Elementar and ICP demonstrated that [Emim]BF4 could enhance bitumen separation efficiently. Negligible sand/clay was entrained in extracted bitumen，and no IL or bitumen was found in the treated sand.

Key words: oil sands, solvent extraction, ionic liquid, bitumen

摘要： 传统水洗法和溶剂萃取法萃取油砂沥青时，存在沥青中含有沙土和残沙中含有油等缺点。为解决上述缺点，本文采用不同比例的乙酸甲酯/正庚烷复合溶剂萃取油砂沥青，研究了离子液体（1-丁基-3-甲基咪唑四氟硼酸盐，[Emim]BF4）对该溶剂萃取体系的萃取率和分离洁净程度的影响。采用红外光谱仪和扫描电镜对萃取后的残沙和沥青的洁净程度进行了定性分析，并结合元素分析仪和电感耦合等离子体发射光谱仪获得萃取后残沙和沥青的洁净程度的定量结果。实验结果表明：当复合溶剂体积比为2∶3时，[Emim]BF4促使沥青回收率达到最大值94.20%，比单纯复合溶剂萃取体系的最大萃取率高7.92%；通过上述测试方法的定性和定量分析，证明了[Emim]BF4能有效解决沥青夹带沙土和残沙中含油的问题。

关键词: 油砂, 溶剂萃取, 离子液体, 沥青