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Thanaporn Wannachod,Natchanun Leepipatpiboon,Ura Pancharoen,Kasidit Nootong 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The separation of Nd(III) from lanthanide series via hollow fiber supported liquid membrane (HFSLM)using synergistic extractant was investigated. Optimum extraction and stripping obtained were 94.5%and 85.1% using D2EHPA and TOPO mixtures (0.5:0.5 M/M) as the synergistic extractant. Reaction orderfor both extraction and stripping were first-order with rate constants of 1.444 and 1.338 min1,respectively. The experimental results were used to correlate with the models. Results showed that theconcentration of Nd(III) from the experiment fitted in well with the model results. The average deviationwas 1.95% and 2.18% for predictions in both feed and stripping sides, respectively.
Prakorn Ramakul,Natchanun Leepipatpiboon,Chamaiporn Yamoum,Uthen Thubsuang,Sirapop Bunnak,Ura Pancharoen 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
An experimental investigation was carried out to reduce the concentration polarization at feeding interphase between feed solution and liquid membrane imposing flow instabilities. The periodic operation of the hollow fiber supported liquid membrane for separation of lanthanide metal by using D2EHPA as extractant dissolved in kerosene. The operating flow rate of the feed solution was varied according to a symmetric square wave function around time-average values of 200, 300 and 400 ml/min. Time periods ranging from 18 to 3 minutes and amplitudes of 50 and 100 ml/min were investigated. The results of these periodic tests were compared with results obtained from the conventional steadystate mode of operation. It has been found that the periodic operation leads to higher stripping concentration or higher ion flux than that obtained from the corresponding steady state operating conditions. This is because periodic operation disturbs concentration polarization in the boundary layer between the feed solution and liquid membrane. It has also been found that the ion flux increases with increasing amplitudes and decreasing time periods of the forcing function. However, when the period is less than 3 minutes the flux decreases because the liquid membrane is peeled out from the pores of hollow fiber.
Prakorn Ramakul,Natchanun Leepipatpiboon,Ura Pancharoen 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
The separation of cobalt(II) and nickel(II) ions by HFSLM has been presented. The feed solution is 0.5M thiocyanate containing 300 ppm each of cobalt(II) and nickel(II) ions, whereas extractant is Alamine300 and the stripping solution is ammonia. Cobalt(II) is more preferable with Alamine300 than nickel(II). The effects of pH, Alamine300concentration and ammonia concentration were investigated. Seven diluents were used: hexane, decanol, chlorobenzene,benzene, dichloromethane, ethylene dichloride and chloroform with different polarity indexes, from 0.1-4.1. Nickel(II)ion which is unpreferable with Alamine300 was used as a tracer to determine the membrane stability. The polarity of the diluents was found to be the main factor influencing the extraction performance and stability of a liquid membrane. The decreasing of polarity of the diluent can prolong the membrane stability, but the percentages of extraction and stripping decreased. The longest lifetime, 200 minutes, was obtained by using hexane as a diluent with the polarity index of 0.1.
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.
Thanaporn Wannachod,Natchanun Leepipatpiboon,Ura Pancharoen,Suphot Phatanasri 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The mass transfer of Nd(III) via hollow fiber supported liquid membrane was studied. At pH 4.5 using0.5 M 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester as the extractant and 1 M H2SO4 as thestripping solution, optimum extraction and stripping reached 98% and 95%. Mass transfer resistance dueto chemical reaction proved to be of the highest value, i.e. 1/Ke = 5.871 102 s/cm. Thus, this indicatedthat the mass transfer resistance from the extraction was the most important. Further, themass transfermodel fitted in well with the experiment data. The average deviation in the feed side was below 5%.
Prakorn Ramakul,Niti Sunsandee,Natchanun Leepipatpiboon 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
−The enantioselective separation of levocetirizine via a hollow fiber supported liquid membrane was examined. O,O'-dibenzoyl-(2R,3R)-tartaric acid ((-)-DBTA) diluted in 1-decanol was used as a chiral selector extractant. The influence of concentrations of feed and stripping phases, and extractant concentration in the membrane phase, was also investigated. A mathematical model focusing on the extraction side of the liquid membrane system was presented to predict the concentration of levocetirizine at different times. The extraction and recovery of levocetirizine from feed phase were 75.00% and 72.00%, respectively. The mass transfer coefficients at aqueous feed boundary layer (kf) and the organic liquid membrane phase (km) were calculated as 2.41×102 and 1.89×102 cm/s, respectively. The validity of the developed model was evaluated through a comparison with experimental data, and good agreement was obtained.
Ura Pancharoen,Prakorn Ramakul,Natchanun Leepipatpiboon 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.4
The enhancement of liquid membrane performance in this study, by consecutive extraction using a synergistic extractant, is the first to demonstrate that the synergistic extractant, normally employed in the solvent extraction process, can also be extended to extraction applications via a liquid membrane. The study focuses on increasing the flux of metal ions using a consecutive extraction reaction which occurs inside the liquid membrane phase. Uranium ions in trisodium phosphate solution, a by-product of monazite processing, are the specie of interest in this experiment. The feed solution is trisodium phosphate containing uranium ions, whereas the stripping solution is nitric acid. The extractant is Aliquat336 mixed with TBP in kerosene. The results demonstrate that when Aliquat336 is mixed with TBP, the flux of uranium ions is synergistically increased because of a consecutive extracting reaction in the liquid membrane phase. The highest flux is 3600 mg m2 s1 with 0.06 M TBP and 0.6 M Aliquat336. Synergistic extraction is also obtained because the flux is much higher than that obtained using a single extractant.
Srestha Chaturabul,Thanaporn Wannachod,Natchanun Leepipatpiboon,Ura Pancharoen,Soorathep Kheawhom 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The simultaneous extraction and stripping of mercury(II) from petroleum produced water via hollowfiber supported liquid membrane (HFSLM) was examined. Optimum conditions for extraction andstripping were pH 1 in feed solution, 5% (v/v) Aliquat 336 in the liquidmembrane and 0.05 Mthiourea inthe stripping solution. Percentages obtained for extraction and stripping of mercury(II) were 96.8% and92.5% which were below the legislation limit of 5 ppb. The overall mass transfer resistance (R) was7.286 102 s/cm. Results showed that themass transfer model fitted in well with the experimental data.
Teerapon Pirom,Ura Pancharoen,Natchanun Leepipatpiboon,Kraiwith Wongkaew,Thanaporn Wannachod 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Separation of Co(II) and Mn(II) from sulphate media through triple HFSLM in series using D2EHPA was explored. Mn(II) was extracted preferentially over Co(II) at the pH value of 5, 100 ppm of Co(II) and Mn(II), 5% (v/v) of D2EHPA, 0.2 M HCl. The highest extraction percentage of Mn(II) was 98.14%, and Co(II) remained at 94.05% in the raffinate stream. The reaction order (n) and the reaction rate constant (kf) were found to be 1.00 and 0.0180 min 1, respectively. Furthermore, the reaction flux model proved to be in good agreement with the experimental data at an average deviation of 2.24%.
Prakorn Ramakul,Unchalee Mooncluen,Yachanapa Yanachawakul,Natchanun Leepipatpiboon 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The mutual separation of lanthanum(III) and cerium(IV) was performed by using a hollow fiber supported liquid membrane. D2EHPA was used as an extractant. The effects of the sulfuric acid concentration in the feed solution, D2EHPA and strippant on the percentage of extraction and stripping were examined. The separation of lanthanum(III) by 4% (v/v) D2EHPA was achieved while cerium(IV) was rejected in the feed solution. A mathematical model focusing on the interface layer was presented to predict the thickness of the layer. The relationship between flux and layer thickness was in good agreement with experimental results and mass transfer theory.