阳离子聚丙烯酰胺辅助溶剂萃取油砂沥青工艺研究

Study on Solvent Extraction Process from Oil Sands Amended with CPAM

使用甲苯、正庚烷、石油醚和石脑油,辅以阳离子聚丙烯酰胺和离子液体等助剂对加拿大亲水型油砂进行了萃取实验,并从沥青回收率、沥青中细沙夹带和残砂形貌3个角度对沥青分离效果进行了分析评价,最终认为阳离子聚丙烯辅助石脑油萃取油砂沥青是一种经济可行的工艺路线。随后文章从助剂浓度、助剂存放时间、助剂和油砂比例、溶剂和油砂比例等角度出发,对工艺参数进行了优化。结果表明,在室温条件下,当石脑油∶0.05%CPAM水溶液∶油砂为3∶2∶1时,沥青回收率由72.29%提升至78.29%。此外,通过对沥青的红外分析和残砂的扫描电镜分析还发现,阳离子聚丙烯酰胺在甲苯和石脑油萃取体系中均有夹带减小细砂的功效。

Toluene, n-heptane, petroleum ether and naphtha were used as the solvent to extract bitumen from water-wet oil sands amended with CPAM （cationic polyacrylamide） aqueous solution and pure [ Emim ] BF4. The bitumen recovery, infrared spectrum of bitumen and SEM microphotographs of the re- sidual sands/clay constitute the three aspects of evaluation of the solvents and additives. Finally, naphtha amended with CPAM aqueous solution were regarded to be reliable and practical. After the optimization, the bitumen recovery increased from 72.29% to 78.29% while the ratio of naphtha to 0.05% CPAM a- queous solution to oil sands was 3： 2：1 at room temperature. In addition, CPAM aqueous solution demon- strated the ability to reduce clay/fines entrainment both in bitumen and naphtha systems.