Research Abstracts

Application of membrane techniques (pervaporation and membrane-based solvent extraction) and adsorption tothe removal of phenol from solutions modelling wastewater from phenol production by cumene oxidation processwas investigated. The transport and separation properties of composite membranes PEBA,

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

Studies on the possibility of using of polysulfone as a coating for water soluble NPK granular fertilizer were performed. The coatings were formed from the polymer solutions by the phase inversion technique. The polymer concentration in the coating forming solution was 18 wt.%. As the polysulfone co

Aqueous dispersions of siloxane-urethane copolymers (polysiloxaneurethanes) containing 0–49% of siloxane moieties were synthesized by the modified prepolymer-ionomer method. The properties of the dispersions were determined. Dense membranes were prepared from those dispersions by crosslinking with a

The synthesis of new copolysiloxane-imide polymers was carried out from a,w-dimethylsiloxane oligomers and aromatic di-anhydrides (PMDA and 6FDA) to obtain soluble siloxane-imide based polymers (PSI) endowed both with organophile properties and good physical membrane properties. Synthesized PSI bloc

Surface modification of nanofiltration cellulose acetate (CA) membranes was carried out by alternating layer-bylayer deposition of acidic chitosan (CHI) and sodium alginate (ALG) as the cationic and anionic polyelectrolyte, respectively. The supporting CA membranes were obtained by a phase separatio

The relationship between friction coefficients and hydration numbers of permeating solutes through membranes is presented in the framework of generalised Spiegler–Kedem–Katchalsky frictional model equations (SKK model). The membrane system contained multicomponent, non-ionic and homogeneous hydrated

A solute flow model of the equations for a double-membrane system, in which a series of two (Ml and Mr) vertically mounted flat, microporous and symmetric polymer membranes separate three compartments (l, m, r) containing the non-homogeneous, non-ionic solutions was developed. Solution concentration

experimental data pertinent to the free volume approach are presented. The positron lifetime measurements performed on vinyl polymers showed that the free volume of the amorphous phase varied with the pendant group change. The transport phenomena depend on both the free volume and the mobility of th