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- 저자 : Pouria Amani (검색결과 2 건)
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Dynamics of interfacial layers for sodium dodecylbenzene sulfonate solutions at different salinities
Pouria Amani,Reinhard Miller,Seher Ata,Suzanne Hurter,Victor Rudolph,Mahshid Firouzi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
This study investigates the adsorption mechanisms and the dilational surface rheology of the anionicsurfactant sodium dodecylbenzene sulfonate (SDBS) at the air–liquid interface, in the presence andabsence of NaCl over a wide range of SDBS concentrations. We also evaluate the Langmuir and Frumkinmodels in order to predict the dynamic adsorption of SDBS solutions. Our results reveal that theequilibrium surface tension of SDBS solutions is a monotonically decreasing function of NaClconcentration. However, the dilational viscoelastic properties of SDBS solutions are found to be anon-monotonic function of NaCl concentration. NaCl manifests opposing effects on the dilationalviscoelastic moduli of the gas–liquid interface, depending on the frequency of surface oscillation andsurfactant bulk concentration. Our measured dilational surface elasticity and viscosity data show a shiftin the surfactant transition concentration, at which the viscoelastic moduli reach their maximum values,towards smaller surfactant bulk concentrations with increasing salt concentration. It is attributed tosuppressing the electrostatic repulsion between the hydrophilic head groups of surfactant molecules inthe presence of electrolytes. The maximum viscoelastic moduli at different NaCl concentrations is foundto be the reflection of the relative impact of enhanced adsorption and increased diffusion exchangebetween bulk and interface.
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Pouria Amani,Mohammad Amani,Reza Hasanvandian 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
We investigated the hydrodynamic behavior and mass transfer characteristics of a pilot-scale conventional packed bed extraction column of mercaptan removal from liquid propane. The extraction column was filled with pall rings structured packing where mercaptan was extracted from the continuous phase to the dispersed phase, accompanied by a chemical reaction in propane-mercaptan-caustic system. The pulsing was introduced into the column to enhance the mass transfer rate. Hydrodynamic parameters such as hold up, flooding velocity and mean drop size were studied together with the effect of chemical reaction on increasing mass transfer performance. Finally, the mass transfer and axial mixing coefficients were obtained from the optimization of data by ADM. It was found that at the pulsation intensity from 0.003 to 0.007 m/s, the maximum mass transfer and minimum axial mixing occurred and it can be concluded that pulsation improves the efficiency of mass transfer just at low intensities.
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