Development of a new apparatus for gas mixture adsorption measurements coupling gravimetric and chromatographic techniques

An experimental apparatus which allows to measure adsorption isotherms for binary, ternary or quaternary mixtures for pressures between vacuum and 5.0 MPa and temperatures between 263 K and 373 K is presented. This system couples gravimetric and chromatographic techniques. The use of a mass spectrometer as gas analyzer allows to investigate a large variety of gases (such as carbon dioxide, hydrogen sulfide, mercaptans). In this paper, we measure the binary adsorption of hydrogen sulfide in a methane matrix on a commercial activated carbon at 1.0 MPa and at 298 K. Molar ratio in hydrogen sulfide is between 10 mol. ppm and 3 mol.%. Experimental results are then compared to simulated ones. The model which is tested is the classical Ideal Adsorbed Solution theory. This simulation step requires the pure gas equilibrium data obtained and fitted with the Langmuir's law, which are also presented here.