8.  Mathematical Model for the Estimation of Mass Transfer Coefficients at the Extraction of Thiols with Alkaline Solutions in Packed Columns

Authors: Claudia-Irina Koncsag and Alina Barbulescu


Abstract:

The mathematical model for the estimation of mass transfer coefficients at the extraction of thiols from gasoline with alkaline solutions was established by processing the data proceeding from the laboratory experiment and then from a pilot plant. Three sets of data were obtained, one for each case: the laboratory column with dispersion, the laboratory column equipped with a low specific area packing (ap= 60 m2/m3) and a great porosity (ε=0.98) and one in a micropilot size column equipped with Sulzer packing having a much larger specific area (ap= 340m2/m3) and similar porosity (ε=0.96). For each installation, three different thiols at three different NaOH concentrations were tested. The experimental data were statistically analysed and processed using the programs SPSS and CurveExpert. The emerging mathematical model- applied separately to each thiol- allows the estimation of overall mass transfer coefficients, taking into account the following parameters: the dispersed phase velocity, the concentration of NaOH solution, the specific area and the porosity of the packing. The existing model could serve in the oil processing, at dimensioning the alkaline refining of petroleum fractions and also, at the simulation of the said extraction columns.


Keywords: liquid- liquid extraction, mass transfer, modelling, packed columns

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