A high-
pressure view-cell technique based on the synthetic method was used to determine the solubility of carbondioxide in the ionic liquid 1-
n-butyl-3-methylimidazolium methyl sulfate ([bmim][CH
3SO
4]). The tem
peratureranged from 293.2 K to 413.1 K, the
pressure and the carbon dioxide molality reached u
p to ~10 MPa and ~3.3mol of CO
2·(kg of [bmim][CH
3SO
4])
-1, res
pectively. The (extended) Henry's law was successfully a
pplied tocorrelate the solubility
pressures. The final results for the Henry's constant (at zero
pressure) of carbon dioxidein [bmim][CH
3SO
4] (on the molality scale) are correlated within the estimated uncertainty (± 1.3 %) byln(
![](/isubscribe/journals/jceaax/51/i05/eqn/je060190ee10001.gif)
/MPa) = 7.2738 - 1775/(
T/K) - 0.002033(
T/K). Furthermore, some small corrections were a
pplied tothe ex
perimental results for the solubility of carbon dioxide in the ionic liquid 1-
n-butyl-3-methylimidazoliumhexafluoro
phos
phate ([bmim][PF
6]) re
ported in
previous work. The corrected values for the Henry's constant ofcarbon dioxide in [bmim][PF
6] only slightly and systematically deviate (by about -2 % at given tem
perature)from the values re
ported
previously.