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Kinetics of high temperature conversion of furfuryl alcohol in water
Milan Hronec,Katarı´na Fulajta´rova,Toma´ sˇ Sota´k 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The kinetics of furfuryl alcohol conversion to 4-hydroxycyclopent-2-enone (4-HCP), polymers andlevulinic acid (LA) in water was investigated in batch reactors at temperatures 110–200℃. These acidcatalyzed reactions are at high temperatures catalyzed by hydrogen ions formed by autodissociation ofwater. At temperatures 180–200℃ and reaction times 5–10 min more than 50 mol% yields of 4-HCPwere achieved. A kinetic model which describes experimental data was developed. The values of theapparent activation energies of the main reaction and the side reactions are very similar, what meansthat the selectivity of 4-HCP formation is independent on the temperature. It indicates, that is attractiveto perform furfuryl alcohol transformation to 4-HCP at high temperatures without changing theselectivity.
Niti Sunsandee,Natchanun Leepipatpiboon,Ura Pancharoen,Prakorn Ramakul,Milan Hronec 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A case study on the synergistic enantioseparation of (S)-amlodipine from pharmaceutical wastewater by using hollow fiber supported liquid membrane (HFSLM) was examined. A chiral reaction flux mathematical model was applied. Optimum conditions achieved the highest percentages of extraction and stripping viz. 84% and 80%, respectively. Relevant parameters affecting the enantioseparation efficiency of (S)-amlodipine were determined. Standard deviation percentages were 2.31% for extraction and 1.26% for stripping. It was found that the mathematical model proved to be in good agreement with the experimental data.
Salt effect on the liquid-liquid equilibrium of water-furfuryl alcohol-furfural system at 298.15 K
Naphaphan Kunthakudee,Ura Pancharoen,Katarína Fulajtárová,Tomáš Soták,Milan Hronec,Prakorn Ramakul 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Salt effect on the liquid phase equilibrium of the water-furfuryl alcohol-furfural system at 298.15 K was studied. The effects of salt concentration (1, 3 and 10% w/wNaCl) and type of salt (LiCl, KCl and RbCl) were investigated. The solubility and tie-line data of these systems were determined by experimental analysis. The results showed that addition of salt significantly affected the two-phase region of ternary system; the enlargement of two-phase region occurred with an increase of salt concentration in initial aqueous phase and the type of the salt in the following order: LiCl>NaCl>KCl>RbCl. Distribution coefficients and separation factors were also calculated. The reliability of the LLE experimental results was validated by the Othmer-Tobias equation, Hand equation and Bachman equation. NRTL was employed to correlate the results obtained by the modeling with the experimental data. Good correlation result was confirmed by the rmsd values of less than 0.3%.