Gas separation

An analytical approximate solution for the competitive facilitation factor of components A and E across a liquid membrane is developed in the case of instantaneous reactions inside the liquid membranes. This analytical solution solves the dimensionless, nonlinear diffusion-reaction transport problem

Polymers are widely used as membrane material to perform the separation of various gaseous mixtures due to their attractive permselective properties and high processability. Although the development of new robust materials is fundamental to enlarge the economic competitiveness in aggressive environm

In the present study, the permeability of H2, N2 and CO2 was investigated through supported liquid membranes prepared by using four types of novel ionic liquids (VACEM 42, VACEM 44, VACEM 47, VACEM 58) under various gas phase pressures (2.2 bar, 1.8 bar, 1.4 bar) and temperatures (30°C, 40°C, 50°C).

Self-standing dense membranes from hyperbranched copolyimides based on (hexafluoroisopropylidene)diphthalic anhydride (6FDA), 1,3,5-tris(4-aminophenoxy)benzene (TAPOB) and 4,4´-(hexafluoroisopropylidene)dianiline (6FpDA) were successfully prepared and characterized for physicochemical properties. Th

This work studied the use of room temperature ionic liquids (RTILs) based on the 1-n -alkyl-3methylimidazolium cation, in supported liquid membranes (SLMs), in order to use them as membrane materials for separation and enrichment of hydrogen from a gaseous mixture containing H2, CO2, and N2. Differe

A new class of multi-wall carbon nanotubes (MWCNTs)/carbon nanocomposite thin films was successfully prepared by incorporating (MWCNTs) into polyimide (PI) precursor solution. The carbon films were obtained in only one coating step by spin-coating technique on a macroporous alumina substrate and wer

To build and operate a “hydrogen economy” in future, it is essential to develop safe and reliable technologies to handle (produce, recover, concentrate, store, deliver, etc.) hydrogen gas. In this work, application possibilities of polystyrene foam were studied and the experiments have proven that c

The gas transport properties of Polyimide membranes were examined as a function of physical aging time. A clear decrease of the gas permeability coefficient was observed. Interpretation of the permeation properties using results from differential scanning calorimeter and dynamic mechanical analyzer

Short- and long-term physical aging tests of high molecular weight poly(methyl methacrylate) (PMMA) membranes have been performed at different temperature. The effects of physical aging on the gas permeation properties are studied. Experimental data show that the physical aging decreases the volume

Biodegradable polymer/layered silicate nanocomposite membranes were prepared by solution casting method for the application of dehumidification and gas separation. The intercalation and exfoliation of clay in the prepared nanocomposite membranes were confirmed through X-ray diffraction study (XRD).