BACKGROUND: Supercritical CO 2 enrichment of omega3 essential fatty acids (FAs) from Tyulka oil, using a batch process was investigated. Fractional factorial design was applied to evaluate the effects of the five process parameters: pressure (20.26 to 25.33 MPa); temperature (40 to 50• C); packing fraction (0.5 to 0.7); modifier fraction (2 to 5%); and dynamic time (15 to 25 min), and their binary interactions on the enrichment of extracted omega3 FAs. By employing experimental design and analysis of variance, the variables were evaluated according to the significance of their effect on the yield of extracted omega3.
Fine layer growth of SAPO-34 crystals on the steel and α-alumina substrates has been investigated by electrophoretic deposition (EPD) followed by secondary growth. At first step, two sizes of SAPO-34 seeds with different composition of precursor solution were synthesized. Thereafter the best quality of the seeds in term of crystal size was selected for seeding operation. All seeded samples were prepared by electrophoretic deposition (EPD) with 0.4 wt% powder in solution, voltage of 4.5 V and deposition time of 90 min, followed by the secondary growth in a Teflon lined autoclave for crystallization at 473K for 24 hr. The prepared fine seeds characterized by XRD and SEM analysis. Also the substrates were broken and characterized by SEM methods in terms of surface coverage and mean size of the particles. The results revealed a better quality of the coated film on the surface of steel rather than α-alumina on the base of homogeneity and crystal size.
Multi-walled carbon nanotube and nanoTiO2 composite,(MWCNT)-TiO2,was synthesized via sol-gel deposition method. The product was characterized with FE-SEM and XRD analysis and the results were compared with nanotube TiO2 prepared by thermal treatment of the produced nanocomposite. Photocatalytic degradation of acetaldehyde, under UV and visible light irradiation, was performed in a continuos flow reactor equiped with 80W Hg lamp and the results were compared with commercial TiO2 powder (P25). Results showed considerable decrease in concentration of acetaldehyde fed into the reactor during a short time (70 min) for hybrid materials in comparison to nanotube TiO2. Furthemore, under visible light irradiation nanocomposite materials revealed good improvement in photocatalytic efficiency with respect to P25 powder.
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