ABSTRACT

To study the possibility of using ionic liquids (ILs) as a novel solvent for the absorption of hydrogen chloride (HCl) from the industrial tail gases, the solubility of HCl gas in three ILs has been measured at four temperatures, (298.15, 323.15, 348.15, and 363.15) K, in the pressure range of (0 to 100) kPa. The ILs used are 1-butyl-3-methylimidazolium chloride ([Bmim]Cl), 1-hexyl-3-methylimidazolium chloride ([Hmim]Cl), and 1-octyl-3-methylimidazolium chloride ([Omim]Cl). The results indicate that these ILs show high solubility for HCl gas, and the solubility decreases with the increasing length of the alkyl substitutes of the ILs, following the order [Bmim]Cl greater than [Hmim]Cl greater than [Omim]Cl. The solubility of HCl in [Bmim]Cl at 298.15 K is about 0.68 mole fraction at ca. 100 kPa partial pressure of HCl, which is much higher than that of 36.5 % HCl aqueous solution. The solubility of different ILs is discussed in detail, and the experimental data (P T x) are correlated successfully by an empirical relation.

Compounds

#	Formula	Name
1	ClH	hydrogen chloride
2	C8H15ClN2	1-butyl-3-methylimidazolium chloride
3	C10H19ClN2	1-hexyl-3-methylimidazolium chloride
4	C12H23ClN2	1-methyl-3-octylimidazolium chloride

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	1 2	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Pressure difference	42
POMD	1 3	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Pressure difference	45
POMD	1 4	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Pressure difference	43

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubility of Hydrogen Chloride in Three 1-Alkyl-3-methylimidazolium Chloride Ionic Liquids in the Pressure Range (0 to 100) kPa and Temperature Range (298.15 to 363.15) K

He, R.-H.[Ru-Hao], Long, B.-W.[Bing-Wen], Lu, Y.-Z.[Ying-Zhou], Meng, H.[Hong], Li, C.-X.[Chun-Xi]

ABSTRACT