This contribution aims at obtaining benzaldehyde by interfacial catalytic oxidation of benzyl alcohol, using a dynamic membrane consisting of RuO2.xH2O on a polymeric support. It is shown that by this procedure it si possible to obtain benzaldehyde free of any other oxidation products. the oxidation mechanism is redarded as homolytic, with the active component being RuO4.

The process industry slowly moves towards a sustainable technology in which raw materials and side products are recovered and reused and the energy consumption is reduced as much as possible. Electrodialysis by sulfonated polyetherketones was presented.

Much of the interest in the calixarenes derives from their promise as selective and useful complexation agents. This depends în part simply on the presence of cavities, but for the more sophisticated application of complexation and catalysis it is also necessary that appropriate functional groups be present. This paper present the esterification of p - tertbutylcalix [4] arene and calix [4] arene with 10 - undecenoyl chloride în pyridine as solvent

Extraction behaviour of two type of alkaline metals (Na +, K+) cations from aqueous phase to an organic phase ( methylene chloride and 1,2 dichloroethane ) was investigated with five types of extractants: p-tertbutylcalix[4]arene, aminobenzo-15- crown –5, aminobenzo-18 -crown- 6 and a mixture of p-tertbutylcalix[4]arene with each crown ethers mentioned above . All macrocyclic ligands show a moderate affinity for sodium and potassium cations. The

In this work, the Pb2+ cations transport through a chloroform liquid membrane with macro cycle benzo18-crown-6 as carrier was studied. Double jet liquid membrane system on chloroform, characterized by a large area of contact between the phases, was used. The carrier macro cycle benzo18-crown-6 ensures Pb2+ cations transport as a result of the selective complexion. The model transfer of Pb2+ cations within this liquid membrane type is a mechanism

Increasing the preformance of an ultrafiltation procces can be achieved by a series of techniques related to the colloidal ultrafiltration. One of the most promissing technique is represented by the main colloidal filtration, in which the isolated sistem is aditivated with functionalised nanoparticles. In this paper, the cupric ions separation is achieved using a polysulphone membrane and complexant composite nanoparticles based on poly(vinyl acetate),

The development of the membrane separation processes require highly specialized membranes, thus implying both getting new polymer types and diversifying the preparation methods: consequently a new research direction was developed, that modified polymeric membranes. The paper presents a literature study on the membranes modified physically (i.e. thermal treatment, with solvents, by immediation or special coatings),chemically (special polymer grafting,

The paper presents the ultrafiltration as a separation process and as a membrane phenomenon, approched by means of the problems arising at the practical application of the process. The concentration bias phenomenon is discuted and the operating means and membrane configurations are presented the main engineering elements for the ultrafiltration being preesented. The methods of membrane obtaining are underlined and the main applications are reviewed.

The removal of soluble organic compounds from the aqueous solutions it eusually done by reverse osmosis. this paper presents the possibility of separating the low molecular weight solutes fromvarious systems, using ultrafiltration membranes. The two considered dyes (foodstuff orange and red dispersion dye) are separated by an ultrafiltration membrane of polysulfone or polyamide, intoducing in the separation sistem surface active agents of the alkyl