Publications

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    Roman Szafran
    Inż. Ap. Chem. 01/2013; 52:475–476.
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    Roman Szafran, Tadeusz Tomczak
    Inżynieria i Aparatura Chemiczna. 01/2013;
  • R G Szafran
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    ABSTRACT: This chapter discusses various aspects of the application of fluid-bed technology for coating and encapsulation processes. Particular attention has been paid to the principles of the fluidization technique, the miscellaneous fluid bed-coating processes and various coater configurations, with a special emphasis on fine powder coating, dry coating and encapsulation. Part of the chapter is devoted to fluidized bed chemical, molecular and atomic layer depositions as methods for preparation of functionalized micro- and nanopowders, and presents the classification of powders based on their fluidization behavior, including micro- and nanopowders. As the quality and properties of the coated product strongly depend on the quality of fluidization and are associated with the fluidization regime in which the coater operates, it is important to correctly choose methods, apparatuses and operating conditions to successfully carry out the process. Design, optimization and scale-up of the fluid-bed coating process and apparatus based on classical algebraic equations, dimensionless correlations and numerical simulations are discussed extensively. © 2013 Scrivener Publishing LLC. All rights reserved.
    Encapsulation Nanotechnologies, 01/2013: pages 71-105; , ISBN: 9781118344552
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    R Szafran
    Inżynieria i Aparatura Chemiczna. 01/2013; Nr 5:477–478.
  • Roman G Szafran, Janusz Nowak
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    ABSTRACT: Economic and techn. aspects of the sepn. of CO2 from synthesis gas for energy prodn. in integrated gasification combined cycle and by underground coal gasification were taken into consideration. A new concept for simultaneous sepn. of CO2, S compds. and moisture from the fuel gas (prior to combustion) by a membrane process was outlined. Selective sepn. of acid gas components in the membrane contactor resulted in redn. of plant size and improving the CO2 stream quality necessary for its sequestration in a single-stage system.
    Przemysl Chemiczny 11/2012; 91(11):2212-2218. · 0.34 Impact Factor
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    ABSTRACT: Batch sorption experiments were carried out for the removal of cationic dyes (methylene blue and malachite green) from their aqueous solutions using sorbent made from fly ash-a waste material. Effects of various experimental parameters: initial dye concentration, contact time, pH, adsorbent dosage, solution temperature, surfactant addition and ionic strength on the fly ash sorption of dyes were evaluated. The isothermal data for sorption followed the Langmuir model. The maximum sorption capacity obtained for methylene blue and malachite green was 36.05 mg/g and 40.65 mg/g, respectively. Kinetic studies indicate that sorption on fly ash follows the pseudo-second order kinetics. Present research suggests that fly ash could be an appropriate adsorbent for the removal of basic dyes from aqueous solutions.
    Water Environment Research 02/2012; 84(2):162-9. · 1.13 Impact Factor
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    ABSTRACT: Pseudomonas aeruginosa culture contg. inorg. salts and glycerol was used for synthesis of the biosurfactant. The sort was purified by 2-stage ultrafiltration at 20 degrees C (pore diams. 100 kDa and 3-50 kDa). The retentate from the 1(st) stage was dild. with MeOH or EtOH to destroy the micellar structures. The recovery of rhamnolipid was higher than 90%. The crit. micelle concn. of rhamnolipid was 40 mg/L, surface tension its aq. soln. was 28,6 mN/m.
    Przemysl Chemiczny 09/2011; 90(9):1762-1766. · 0.34 Impact Factor
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    ABSTRACT: Classic methods of biosurfactant separation are difficult and require large amounts of organic solvents, thus generate high amounts of waste. This work presents and discusses in detail an original procedure to separate rhamnolipid from fermentation broth using high performance membrane techniques. Due to the unique properties of surface active agents, such as capability of forming aggregates above the critical micelle concentration, it is possible to easily purify the biosurfactant with high efficacy using inexpensive and commonly used membranes. In this article, two-stage ultrafiltration is proposed as a method for separating and purifying rhamnolipid from the culture medium. The obtained purified rhamnolipid solution was capable of reducing surface tension of water down to 28.6 mN/m at critical micelle concentration of 40 mg/l. Separation of rhamnolipid was confirmed by HPLC; three types of rhamnolipids were identified (RL1, RL2, RL4), with considerable predominance of RL2.
    World Journal of Microbiology and Biotechnology (Formerly MIRCEN Journal of Applied Microbiology and Biotechnology) 08/2011; 27(8):1961-1964. · 1.35 Impact Factor
  • Roman Grzegorz Szafran, Wojciech Ludwig, Piotr Patronik
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    ABSTRACT: A review, with 6 refs., of non-invasive methods for measurements of local fluid velocity in 1 and 2-phase flow. In particular, their flaws, advantages and a range of uses in a large scale apparatus were discussed. Principles of the particle image velocimetry were explained.
    Przemysl Chemiczny 04/2011; 90(4):580-586. · 0.34 Impact Factor
  • Roman Grzegorz Szafran, Wojciech Ludwig, Piotr Patronik
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    ABSTRACT: Particle image velocimetry was used for studying the laminar straight-tube flow and turbulent jet flow. The exptl. data were used for validation of Ansys/Fluent and Palabos computational codes. In booth cases, the fit of simulation results to the theor. curve and exptl. data was excellent.
    Przemysl Chemiczny 04/2011; 90(4):587-590. · 0.34 Impact Factor
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    ABSTRACT: Pseudomonas aeruginosa bacteria was sepd. from the rhamnolipid-contg. fermentation broth by ultrafiltration through a com. polysulfone membrane (cut-off 100 kDa) under cross-flow mode conditions (up to 2 bar). At the bacteria concn. 2 g/L, the flux of the suspension 100 L/m(2)h was achieved.
    Przemysl Chemiczny 03/2011; 90(3):440-445. · 0.34 Impact Factor
  • Anna Witek-Krowiak, Roman G. Szafran, Szymon Modelski
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    ABSTRACT: Biosorption of Cu(II) and Cr(III) ions from aqueous solutions by peanut shell biomass was investigated as a function of initial pH, initial biomass concentration and temperature. The optimum sorption conditions were studied for each metal separately. The kinetics and equilibrium of biosorption were examined in detail. Four kinetic models (pseudo-first order, pseudo-second order, power function equation, and Elovich model) were used to correlate the experimental data and to determine the kinetic parameters. Four well-known adsorption isotherms were chosen to describe the biosorption equilibrium. The experimental data were analyzed using two two-parameter models (Langmuir and Freundlich) and two three-parameter models (Redlich–Peterson and Sips). The equilibrium biosorption isotherms showed that peanut shells possess high affinity and sorption capacity for Cu(II) and Cr(III) ions, with monolayer sorption capacities of 25.39mg Cu2+ and 27.86mg Cr3+ per 1g biomass, respectively. All results showed that peanut shells biomass is an attractive, alternative low-cost biosorbent for removal of heavy metal ions from aqueous media.
    Desalination. 01/2011; 265(1):126-134.
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    ABSTRACT: Eleven waste bio-materials were used as biosorbents for removal of Cu2+ and Cr3+ ions from aq. solns. Sorption equil. and kinetic consts. were detd. at 20-60 degrees C and pH 3-5. The sorption capacity was 20-60 mg/g not lower than that for a polymeric sorbent with carboxylic groups and an activated C.
    Przemysl Chemiczny 01/2011; 90(1):128-131. · 0.34 Impact Factor
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    ABSTRACT: PhOMe was acylated with Ac2O to p-AcC6H4OMe in MeNO(3) on acidified and optionally calcinated synthetic zeolite, montmorillonite and bentonite clays at 95 C for 3 h to compare the catalytic activity of the solid Friedel-Crafts catalysts. The highest conversion was achieved when montmorillonite and zeolite catalysts were used (38% and 35%, resp.). The catalyst activity decreased rapidly during the reaction. Traces of polycyclic compds. and small amts. of o-AcC(6)H(4)OMe (1-2%) were found in the reaction products.
    Przemysl Chemiczny 09/2010; 89(9):1217-1220. · 0.34 Impact Factor
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    ABSTRACT: PhOMe was acylated with Ac2O to p-AcC6H4OMe in MeNO2 on nanocomposite SiO2-supported Nafion catalyst at 95 degrees C for 3 h to compare the catalytic activity of the catalysts with known alumosilicate catalysts. The highest conversion (40%) was achieved when unsupported Nafion NR50 was used as the catalyst. The economic efficiency of the catalyst use was much higher for the cheap alumosilicate catalysts than for the polymeric ones.
    Przemysl Chemiczny 09/2010; 89(9):1221-1224. · 0.34 Impact Factor
  • Inżynieria i Aparatura Chemiczna Selected full texts. 01/2010;
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    ABSTRACT: Removal of cationic dyes, rhodamine B and methylene blue, from aqueous solutions by unmodified beech sawdust was investigated. The adsorption kinetics and equilibrium data were fitted by various models. The pseudosecond order kinetics and the Langmuir model described biosorption data reasonably well. The maximum adsorption capacity was 70.40 mg.dm(-3) and 52.66 mg.dm(-3) for rhodamine B and methylene blue, respectively. The study shows that beech sawdust has the potential off application as an efficient sorbent for removal of cationic dyes.
    Inzynieria Chemiczna i Procesowa 01/2010; 31(3):409-420. · 0.39 Impact Factor
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    ABSTRACT: Presented studies are focused on the use of beech sawdust waste biomass for the biosorption of cationic dyes (rhodamine B and methylene blue) from aqueous solutions. The biosorption kinetics of cationic dyes on beech sawdust has been studied. The effects of pH, temperature, salinity and surfactant addition on the dye uptake was investigated.
    Inzynieria Chemiczna i Procesowa 01/2010; 31(3):421-432. · 0.39 Impact Factor
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    ABSTRACT: The aim of this work was to determine the efficiency of the hybrid membrane-sorption system for the removal of heavy metal ions (Cr(3+) being the case in point) from model aqueous solutions. It has been demonstrated that this type of reactor enables the adsorption process to be combined with a separation process involving capillary membranes submerged in the solution being treated. When operated under conditions below the critical flux of the permeate, the submerged membrane system provides high removal efficiency at low energy demand. The experiments were aimed at evaluating the influence of aeration rate, transmembrane pressure and sorbent concentration on the efficiency of Cr(III) ion removal from aqueous solutions. The use of peanut shells, a low-cost waste biosorbent, was proposed as an alternative to conventional carbon adsorbents. Owing to the very low operating costs involved, the treatment mode described above may become competitive with the classical methods of water and wastewater treatment.
    Ochrona Środowiska 01/2010; 32(3):49-52. · 1.63 Impact Factor
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    ABSTRACT: The aim of the study was to investigate the simultaneous removal of p-cresol and Cr(III) ions using a membrane contactor enhanced by a micellar solubilization. The investigations of solutes removal were performed taking advantage a polysulfone capillary membrane contactor in a counter-current mode and a micellar sodium dodecyl sulfate ions solution. The coefficients for a resistance in series mass transfer model were determined.
    Desalination 05/2009; 241:91-96. · 3.04 Impact Factor

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