Investigation of CO and CH capture from syngas in adsorption process and breakthrough modeling by modified Lattice-Boltzmann mesoscale method.

A modified Lattice Boltzmann method (LBM) was developed to model and analyze the transient flow and multi-component adsorption in a dispersive packed bed column of activated carbon as a new kind of meso-scale modeling. The model using DQ (two dimensions and 9 speed) lattice solves the two-dimensional space, convection-dispersion adsorption model for the CO-CH mixture in rich H at transient condition. The sink/source term model was considered as the adsorption/desorption kinetic rate based on Extended Langmuir theory for multicomponent mixture.

Loading hydrophilic drug in solid lipid media as nanoparticles: statistical modeling of entrapment efficiency and particle size.

Solid lipid nanoparticle (SLN) is a very well tolerated carrier systems for dermal application due to the employment physiological and/or biodegradable lipids. The effects of five factors, two categorical and three quantitative factors, were studied on the mean diameter and entrapment efficiency of the produced SLNs using response surface method (RSM), D-optimal design. Two methods of microemulsion and solvent diffusion and two types of lipid, cetyl palmitate and stearic acid, were examined comparatively.

Statistical medium optimization and biodegradative capacity of Ralstonia eutropha toward p-nitrophenol.

The effect of p-nitrophenol (PNP) concentration with or without glucose and yeast extract on the growth and biodegradative capacity of Ralstonia eutropha was examined. The chemical constituents of the culture medium were modeled using a response surface methodology. The experiments were performed according to the central composite design arrangement considering PNP, glucose and yeast extract as the selected variables whose influences on the degradation was evaluated (shaking in reciprocal mode, temperature of 30 degrees C, pH 7 and test time of about 9 h).

Modeling of p-nitrophenol biodegradation by Ralstonia eutropha via application of the substrate inhibition concept.

In this study, the capability of Ralstonia eutropha H16 to degrade p-nitrophenol with or without a supplementary substrate (glucose or yeast extract) was investigated. Using PNP as the sole energy and carbon source, the biodegradation behavior of the bacterium was modeled by applying a modified form of the Monod equation that considers substrate inhibition, as suggested in the literature (mu=(mu(m)S/k(s) +S)(1-(S/S(m)(n)). PNP at a 6 mg/L initial level was degraded within 20h under the defined incubation conditions (shaking at the reciprocal mode, pH 7 and temperature of 30 degrees C) however the biodegradation was enhanced when yeast extract included in the test medium (50% reduction in the time for complete degradation).

Essential oil composition of Valeriana officinalis L. roots cultivated in Iran. Comparative analysis between supercritical CO2 extraction and hydrodistillation.

The composition of essential oil extracted from Valeriana officinalis L. roots growing wild in Iran was studied by hydrodistillation and supercritical CO2 extraction. Forty-seven components representing 89.