Gas separation

Composite gas separation membranes with a 0.1–3 mm thick film of Hyflon AD 60X on a porous hollow fibre ultrafiltration membrane support of amorphous poly(ether ether ketone), were prepared. The influence of the coating conditions on the film thickness and on the pure gas transport properties was st

One way to produce fuel gases is using bioreactors producing CH4/CO2, H2/CO2 and CH4/H2/CO2 gas mixtures. This method has many advantages; for example, low energy consumption, high ecological efficiency, utilization of organic wastes, accessibility and simplicity of hardware implementation. The resu

The application area of existing gas separation membranes is limited by commercially available polymers for their preparation. In many cases the separation selectivity of these polymers is not sufficient for effective separation processes. One of the ways to improve the separation effectivity of exi

Biological production of hydrogen —one of the most promising alternative energy fuels — was planned torealize in an integrated system, where hydrogen is separated by a membrane technique. In this project poly-ethersulfonepolyimide hollow fiber membrane was applied in a specially constructed gas sepa

The Horvath-Kawazoe (HK) model is widely used to characterize microporous carbons and zeolites. The use of the HK model in this application has been extensively studied and interaction parameters exist to relate gas adsorption isotherms to the microporosity of these materials. However, interaction p

A new hybrid gas separation process combining membrane permeation and pressure swing adsorption (PSA) is presented. An integrated model was formulated which successfully predicts all process characteristics. Our modeling work shows that the coupled process increases the efficiency of the pressurizat

A theoretical analysis of the effect of random fiber packing on shell flow distribution, associated shell-side concentration boundary layers, and ultimate performance of shell-fed hollow-fiber gas separation modules is presented. Specifically the relationship between recovery and product oxygen mole

In this paper, nanocomposite materials based on TiO2 and polyimide derived from HQDPA and DMMDA were prepared by blending of TiO2 sol and polyimide solution. Because of the improvement of the TiO2 sol preparation process and blending methods, the TiO2 content of the obtained TiO2/polyimide composite

The separation of hydrocarbons from permanent gases is of considerable importance in the chemical industry. Poly(1-trimethylsilyl-1-propyne) [PTMSP] is extremely permeable to hydrocarbons and has high hydrocarbon/ permanent gas selectivity. However, the poor chemical resistance of this material limi

We studied the synthesis and characterization of a thermally stable metal-containing in sulfonated polyimides (M-SPI) based on benzophenone tetracarboxylic dianhydride (BTDA), 4, 4’-diamino 2, 2’-biphenyl disulfonic acid (BDSA) and meta-phenylenediamine (mPDA). X-ray photoelectron spectroscopy (XPS)