Effect of Acetonitrile on the Solubility of Carbon Dioxide in 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide

Abstract

International audienc

Influence of water on the carbon dioxide absorption by 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide

“…The Henry's law varies from 38 bar for the pure ionic liquid to 56 bar for a water mole fraction of 0.27 at 303 K (corresponding to carbon dioxide mole fractions varying from 2.6 × 10 −2 to 1.8 × 10 −2 ) and from 54 bar for the pure ionic liquid to 75 bar for a water mole fraction of 0.27 at 323 K (corresponding to carbon dioxide mole fractions varying from 1.9 × 10 −2 to 1.3 × 10 −2 ). The same order of a These values are taken from literature [26]. magnitude was measured by our group for the solubility of carbon dioxide in several ionic liquids [41,42] with an overall uncertainty of 5%.…”

“…It is based on an isochoric saturation method that has been described in a previous publication [26] and is depicted in Fig. 2.…”

“…The pressure is measured using a Druck manometer RPT 350 model, calibrated for pressures between 35 and 3500 mbar with a precision of 0.01% full scale. This apparatus has been improved [26] by including a precise control of the temperature in the manometer which is placed outside the thermostated bath. The temperature in the manometer is maintained to within ±0.1 K at 4 • C above the temperature of the thermostated bath and is measured using miniature 100 platinum resistance sensors placed at different points of the apparatus and guaranteeing that a temperature gradient of less than 0.2 K is maintained.…”

“…Details of the data reduction are given in our previous paper [26]. As it has been recently demonstrated by Longinotti et al [34], two possible thermodynamic treatments can be used to describe the solubility of gases in ionic liquids.…”

“…Our group [26] has quantified experimentally the influence of the presence of acetonitrile on the low pressure carbon dioxide solubility in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide,…”