Abstract
Membranes are associated with the efficient processes of separation, concentration and purification, but a very important aspect of them is the realization of a reaction process simultaneously with the separation process. From a practical point of view, chemical reactions have been introduced in most membrane systems: with on-liquid membranes, with inorganic membranes or with polymeric and/or composite membranes. This paper presents the obtaining of polymeric membranes containing metallic osmium obtained in situ. Cellulose acetate (CA), polysulfone (PSf) and polypropylene hollow fiber membranes (PPM) were used as support polymer membranes. The metallic osmium is obtained directly onto the considered membranes using a solution of osmium tetroxide (OsO4), dissolved in tert–butyl alcohol (t–Bu–OH) by reduction with molecular hydrogen. The composite osmium–polymer (Os–P)-obtained membranes were characterized in terms of the morphological and structural points of view: scanning electron microscopy (SEM), high-resolution SEM (HR–SEM), energy-dispersive spectroscopy analysis (EDAX), Fourier Transform Infra-Red (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The process performance was tested for reduction of 5–nitrobenzimidazole to 5–aminobenzimidazole with molecular hydrogen. The paper presents the main aspects of the possible mechanism of transformation of 5–nitrobenzimidazole to 5–aminobenzimidazole with hydrogen gas in the reaction system with osmium–polymer membrane (Os–P).
Highlights
The present paper presents the obtaining of composite polymeric membranes containing osmium obtained in situ, by reducing osmium tetroxide on cellulose acetate (CA), polysulfone (PSf) and polypropylene hollow fiber membranes (PP), for the reduction with molecular hydrogen of 5–nitrobenzimidazole to 5–aminobenzimidazole
The study of 5–nitrobenzimidazole reduction is of particular importance, because the
The paper presents the results obtained at the reduction of 5–nitrobenzimidazole by transformation into 5–aminobenzimidazole, in the reaction system with osmium–polymer membrane (Os–P) with molecular hydrogen, in an aqueous membrane system, with pH = 6 in the source phase and pH = 1 for the receiving phase
Summary
The membranes and membrane processes represent one of the most viable variants of separation, concentration and purification of the chemical compounds from solutions creativecommons.org/licenses/by/ 4.0/). 2 2ofof andcomplex complexmixtures mixtures [1,2]. The. The characteristics characteristics that that recommend recommend the the membrane membrane systems systems and for implementation implementation are: high selectivity, operational parameters for selectivity,flows flowsdriven drivenbybyaccessible accessible operational parame(pressure, temperature andand potential difference), their ters (pressure, temperature potential difference),simplicity simplicityofofthe the modules modules and their repeatability in inlarge large installations, installations, favorable favorable ratio ratio of of useful useful area/installation area/installationvolume volume[3,4,5]. The characteristics characteristics that that recommend recommend the the membrane membrane systems systems and for implementation implementation are: high selectivity, operational parameters for selectivity,flows flowsdriven drivenbybyaccessible accessible operational parame(pressure, temperature andand potential difference), their ters (pressure, temperature potential difference),simplicity simplicityofofthe the modules modules and their repeatability in inlarge large installations, installations, favorable favorable ratio ratio of of useful useful area/installation area/installationvolume volume[3,4,5]. [3,4,5]
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