Institut Francais Du Pe'trole

Felix Marny

Francis Raatz

Dominique A Garnier

Hubert Ajot

Jean Francois Joly

Colette Russmann

For measuring the adsorption and desorption of a gas adsorbed by a solid sample, a gas pressure drop during the adsorption phase or a gas pressure increase during the desorption phase is programmed in the reservoir circuit 1 from 0.1 to 0.7 Pa per minute by at least one regulating valve V.sub.P1 having a proportional opening, in order to transfer a substantially constant flow of gas to the sample and from the sample to the reservoir, the gas pressure being measured periodically in the measuring circuit by pressure sensors. By a microprocessor, the isotherm of adsorption and desorption is determined based on the volume of the reservoir circuit, the quantity of gas transferred, the gas pressure in the measuring circuit, and the volume of the measuring circuit. The system measures the adsorption-desorption isotherms of a gas from a solid.

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Aubergenville, France

Felix Marny