A Convenient Apparatus for Measuring the Diffusion of Gases and Vapors Through Membranes

Permeation Equipment for High-Pressure Gas Separation Membranes

“…Permeation Cell. The basis for the constant volume pressure rise permeation cell has been discussed previously, − so only a quick review is provided here. In this method, a constant pressure is maintained on the upstream face of the membrane after the entire system has been sufficiently evacuated and degassed, while the rising pressure in the permeate reservoir is recorded during the testing period.…”

“…Measuring the permeability of dense films with low-pressure feeds has been done for decades, and several papers have been written describing the equipment designed for such applications. − On the other hand, permeation through materials under high-pressure environments is an active topic that is of increasing importance. − Both inorganic and organic materials have been considered for these applications. Several researchers have begun to investigate both inorganic and organic materials for these applications.…”

Water Vapor Permeability of Organic Films

“…It is rather astonishing, therefore, to reflect that until very recently no concerted effort has been made to standardize an acceptable procedure to measure evaporation rate. A.number of evaporometers have been described in recent years, but in nearly every case their use has been confined to their parent laboratories (#, 8, [9][10][11][12][13][14]• This state of affairs is aptly epitomized in a report of the (British) Institute of Petroleum (8):…”

Challenges in Microflow Measurements

“…The most difficult element to seal in the receiver is the membrane cell. Schumacher and Ferguson (1927) sealed the membrane cell with mercury. Tabe-Mohamadi et al, (1995) used the membrane itself facing two mirror polished plates and reported leak rates below 1.2×10 -9 cm³/s.…”