High Pressure Gas Sorption Analyzers: iSorb HP1/HP2
























QUANTACHROME INSTRUMENTS 1900 Corporate Drive Boynton Beach, Florida 33426 USA U.S. and Canada 1-800-989-2476 Worldwide Tel: 1-561-731-4999 Fax: 1-561-732-9888

high pressure gas sorption analyzer

Print this page

Home

High pressure adsorption measurements are important in the fields of carbon dioxide sequestration, methane storage, hydrogen storage, and gas separation. The iSorb-HP instruments (volumetric sorption apparatus) generate automatic measurements of full adsorption and desorption isotherms over a wide range of pressures and temperatures.

The iSorb series is a family of four such high pressure sorption analyzers; one and two-sample models each available with an upper pressure limit of 100bar or 200bar, complete with built in vacuum pumps and sample degassing capability. All models feature pressure transducers both in the dosing manifold and on the sample cell for maximum sensitivity; this also provides the iSorb-HP2 model the capability to simultaneously analyze two samples.

Measurements are defined in terms of pressure or dose amount for both adsorption and desorption, equilibrium criteria, sample temperature (according to the heating /cooling device selected) and choice of equation of state (EoS)*:

High pressure gas sorption analyzer, the iSorb HP

Schmidt-Wenzel type, defined in terms of Helmholtz free energy (NIST recommended)
MBWR (Modified Benedict-Webb-Rubin type, Jacobsen 32-coefficients, NIST recommended).
Lee-Kesler (generalized Benedict-Webb-Rubin).
Peng-Robinson
Soave-Redlich-Kwong
Redlich-Kwong
Van der Waals
Ideal gas

Analysis temperatures are achieved either by recirculator bath (-20^oC to 100^oC, see below), cryocooler (77K-320K), or heating mantle (up to 400^oC).

This excess adsorption isotherm goes through a maximum. Click to enlarge Using the correct equation of state (EOS) is essential. Click to enlarge.

Brochure

Specifications

Technology

Booster

Gas pressure booster increases cylinder pressure from 55bar to 200bar.

This compensates for the drop in pressure from a standard laboratory cylinder as gas is used for analyses and ensures a constant supply of high pressure gas.