ILs (imidazolium-based) and corresponding recovery methods reported in literature.

Methods		Imidazolium
		Cl−, Br−	BF4−	PF6−	MS−	TfO−	Tf2N−	O2CH−, Ac−, Pr−	SO42−, NO2−	DMP−	BETI−	FeCl4−
Distillation	Distillation of volatile compounds	✓45,78–81	✓46	✓46	✓46	✓46	✓46	✓27,81,84,85
	Distillation through reaction of ILs	✓44,100
Extraction	Extraction with water			✓65,110,111			✓51
	Extraction with organic solvents	✓78,116	✓114,115	✓117	✓118	✓113		✓69
	Extraction with scCO2		✓50,130	✓28,50,123,124,127–129		✓50	✓50,125,126
Adsorption	Adsorption by ACs	✓48,55,70,132–137,149	✓48,70	✓21,48,70,131,136	✓48,132	✓48,70,132,133	✓48,70,132,133	✓132
	Adsorption by soils and sediments	✓47,139,141,143–146,149	✓140,142				✓142
	Adsorption by ion exchange resins	✓149,150,152		✓152			✓152	✓151,153
Membrane separation	Pressure-driven membrane techniques	✓166	✓30,166		✓30					✓72
	Pervaporation			✓171				✓172
	Membrane distillation	✓173						✓68
	Electrodialysis	✓176–179
Aqueous two-phase extraction	ATPE based on chemicals addition	✓31,62,184–187,189,193–195	✓53,190,195,196,199		✓191	✓191,192,194,199		✓188,194		✓191
Crystallization	Solution crystallization	✓203							✓71
	Melt crystallization	✓32	✓54	✓54		✓54,206	✓206
	Pressure-induced crystallization			✓202		✓214
Force field	Gravity separation	✓43
	Centrifugation						✓66				✓66
	Magnetic separation											✓33,218