KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 25

Some of the metrics are blocked by your
consent settings
Synergistic effect of arsenic removal from petroleum condensate via liquid-liquid extraction: Thermodynamics, kinetics, DFT and McCabe-Thiele method
(2023-12-01)
Purktimatanont, Kittamuk
;
Mohdee, Vanee
;
Pancharoen, Ura
;
Maneeintr, Kreangkrai
;
Punyain, Wikorn
This work presents the purification of petroleum condensate by removing arsenic ions via liquid-liquid extraction (LLE). Influence of pure and synergistic extractants is investigated. In terms of the practicability, following parameters are examined: the type of extractant, operating time, and temperature. Response surface methodology is used to design parameters such as organic-aqueous ratio and extractant concentration. Under optimal conditions; a mixture of 1 mol/L HCl and 0.02 mol/L thiourea with an organic/aqueous ratio of 1:4 at 323.15 K for 60 min, the extraction of arsenic reached 78.2 %. Further, batch simulation via two-stage counter-current extraction, and estimation by McCabe-Thiele diagram proved to be enhanced arsenic extraction to 95.3 %. Analysis by FTIR show that arsenic ions in petroleum condensate are formed as triphenylarsine compound ((C<inf>6</inf>H<inf>5</inf>)<inf>3</inf>As). The process of arsenic removal proved to be zero-order endothermic, irreversible and spontaneous reaction. The results obtained from the density functional theory (DFT) confirm that arsenic ions react with the synergistic extractant: effectively forming a covalent bond (As–S).
Some of the metrics are blocked by your
consent settings
New upstream solution for mercury removal from petroleum condensate via HFMC: Thermodynamics, kinetics, DFT and mass transport
(2023-08-01)
Poolkaew, Waranya
;
Mohdee, Vanee
;
Purktimatanont, Kittamuk
;
Pancharoen, Ura
;
Punyain, Wikorn
This work presents a new solution for the removal of mercury from petroleum condensate via hollow fiber membrane contactor (HFMC), which follows the principles and practices of solvent extraction. Results demonstrate that mercury can be successfully removed from petroleum condensate feed by the synergistic mixture solution of HCl and thiourea as extractant. Under equal circulating flow rates of 1.67 cm3 s−1 of feed and the synergistic extractant (0.5 mol dm−3 HCl and 1.5 mol dm−3 thiourea) at 323.15 K, the percentage of mercury removal reached 98.4%. The values of ∆H° (120 kJ mol−1), ∆S° (0.37 kJ mol−1) and ∆G° (−1.15 kJ mol−1) indicate that the reaction is endothermic, irreversible and spontaneous at 323.15 K, respectively. The results of Fourier-transform infrared spectroscopy (FTIR) confirm that mercury has been removed and is consistent with the obtained reaction mechanism from density functional theory (DFT). To describe the mass transport through HFMC, two mass transport mathematical models corresponding to reaction flux and diffusion flux are considered. The reaction flux model is seen to fit in well with the experimental results. The mass transfer coefficients in the membrane phase (k<inf>m</inf>) and shell side (k<inf>s</inf>) are 7.45 × 10−6 cm s−1 and 2.09 × 10−5 cm s−1, respectively indicating that the mass transfer in the membrane phase is the controlling step.
Some of the metrics are blocked by your
consent settings
Mechanisms of mercury ions separation by non-toxic organic liquid membrane via DFT, thermodynamics, kinetics and mass transfer model
(2023-01-25)
Traiwongsa, Natthapol
;
Suren, Sira
;
Pancharoen, Ura
;
Nootong, Kasidit
;
Maneeintr, Kreangkrai
This work focuses on the separation of mercury ions from synthetic produced wastewater via hollow fiber supported liquid membrane (HFSLM). Standard sunflower oil is used as a non-toxic extractant and solvent for mercury ions separation from wastewater. Under optimal conditions: 20 ppm NaCl in wastewater, 0.1 M thiourea in 0.5 M HCl as stripping solution, flow rates of feed and stripping solutions of 100 mL/min, and temperature 323 K, percentages of extraction and stripping reach 98% and 81%, respectively. The mechanisms of extraction and stripping reactions were investigated via the density functional theory (DFT). For the extraction, a linoleic acid extracted HgCl<inf>2</inf> and formed halogen bond. For the stripping, two protonated thiourea stripped HgCl<inf>2</inf> and formed covalent and halogen bonds. According to the thermodynamics study, extraction reaction is found to be endothermic (ΔH<inf>Ex</inf>0 = 1,001.00 J/mol), irreversible (ΔS<inf>Ex</inf>0 = 3.45 J/mol K), and spontaneous, (ΔG<inf>Ex@323K</inf>0 = −112.65 J/mol). Finally, the mathematical model including conservation, convection, diffusion, reaction, and accumulation was developed. The differences of mercury ions concentration in feed and stripping phases from the experiments and the predicted data from the mathematical model were 5% and 2%, respectively indicating that the model is acceptable.
Some of the metrics are blocked by your
consent settings
Separation of platinum(IV) across hollow fiber supported liquid membrane using non-toxic diluents: Mass transfer and thermodynamics
(2017-10-25)
Wongkaew, Krirkratthawit
;
Mohdee, Vanee
;
Pancharoen, Ura
;
Arpornwichanop, Amornchai
;
Lothongkum, Anchaleeporn W.
Non-toxic diluents were studied and compared with toxic diluents for separation of platinum(IV) across hollow fiber supported liquid membrane. 91.41% extraction and 81% stripping of platinum(IV) was observed for sunflower oils at 328.15 K. Overall mass transfer resistance (R) was 146.612 × 104 s/cm. The separation process was exothermic (ΔH<inf>ex</inf> 0 = −975.20 kJ/mol) and spontaneous (ΔG<inf>ex</inf> 0 = −326.447 J/mol). The E<inf>a</inf> of 1.673 kJ/mol indicated that the diffusion of complex species across the liquid membrane controlled the mass transfer step. Moreover, a modified Apelblat model gave an excellent match for predicting the extraction behavior of platinum(IV) at 1.2818% RMSD.
Some of the metrics are blocked by your
consent settings
Mass transfer resistance and response surface methodology for separation of platinum (IV) across hollow fiber supported liquid membrane
(2016-10-25)
Wongkaew, Krirkratthawit
;
Wannachod, Thanaporn
;
Mohdee, Vanee
;
Pancharoen, Ura
;
Arpornwichanop, Amornchai
The separation of platinum (IV) from wastewater across hollow fiber supported liquid membrane was successful in reaching 96% extraction and 88% stripping using 10% (v/v) trioctylmethyl-ammonium chloride (Aliquat 336) as the extractant. The mass transfer resistances were (1/k<inf>a</inf>) 3.297 × 104 s/cm, (1/k<inf>m</inf>) 0.164 × 104 s/cm, (1/k<inf>o</inf>) 3.404 × 104 s/cm and (1/K) 6.865 × 104 s/cm. The system was governed by the mass transfer resistance from the liquid-membrane. Response surface methodology was used to qualify and estimate the influence of operating conditions. Predicted model with experimental data were in good agreement at a standard deviation of 1%.
Some of the metrics are blocked by your
consent settings
The role of organic diluents in the aspects of equilibrium, kinetics and thermodynamic model for silver ion extraction using an extractant D2EHPA
(2015-02-05)
Wongsawa, Thidarat
;
Sunsandee, Niti
;
Lothongkum, Anchaleeporn Waritswat
;
Pancharoen, Ura
;
Phatanasri, Suphot
The effects of organic diluents regarding the aspects of equilibrium data, kinetics of extraction behavior and thermodynamic model are of great importance in the extraction processes. Therefore, these effects were investigated for silver ion extraction by a liquid-liquid extraction process using D2EHPA as an extractant. Various organic diluents that have different dielectric constants like kerosene, cyclohexane, chloroform and 1-octanol were selected for use in this work. The equilibrium data of solubility and tie-lines for the ternary systems of water. +. D2EHPA. +. organic diluents exhibited type-2 LLE behavior at a temperature of 298.2. K and atmospheric pressure. Moreover, the uncertainty propagation calculation was determined to validate the reliability of the data. The extraction efficiency of silver ions for each organic diluent was also investigated; maximum extraction of 94% was obtained for 1-octanol. The extraction behaviors of silver ion with D2EHPA in the different organic diluents were reported as regards their reaction stoichiometry. They were also analyzed by spectroscopic analysis. Results of the thermodynamic NRTL model were obtained and a very good correlation with the experimental LLE data was confirmed by the root-mean square deviation (. rmsd) values of 1%.
Some of the metrics are blocked by your
consent settings
Effect of diluent polarity on membrane stability in the separation of trace Pd(II) from wastewater by HFSLM using LIX84-I
(2015-01-25)
Wongkaew, Kraiwith
;
Pancharoen, Ura
;
Phatanasri, Suphot
;
Leepipatpiboon, Natchanun
;
Lothongkum, Anchaleeporn W.
In a liquid membrane, the type of diluents for the selected extractant plays an important role in membrane stability and separation efficiency. High Pd(II) extraction and stripping of 96% and 91%, respectively, were observed by HFSLM under a feed pH 2, 5% (v/v) LIX84-I dissolved in kerosene and a mixture of 0.8M NH<inf>2</inf>CSNH<inf>2</inf> with 1M HCl as a stripping solution. The highest stability was attained at 350min by using hexane as a diluent. Finally, the calculated activation energy (E<inf>a</inf>) of 30 kJ/mol implied that the separation of Pd(II) was controlled by the diffusion and chemical reaction.
Some of the metrics are blocked by your
consent settings
High-efficiency HFSLM for silver-ion pertraction from pharmaceutical wastewater and mass-transport models
(2014-11-01)
Wongsawa, Thidarat
;
Sunsandee, Niti
;
Pancharoen, Ura
;
Lothongkum, Anchaleeporn Waritswat
Hollow fiber supported liquid membrane (HFSLM) is a favorable technique for the pertraction of metal ions, especially at very low metal concentration. In this work, the pertraction of silver ions from acidic pharmaceutical wastewater via HFSLM was investigated. Pharmaceutical wastewater containing 30mg/dm3 of silver ions and 120mg/dm3 of ferric ions was subjected to HFSLM as a feed solution. LIX 84-I dissolved in organic solvent together with Na<inf>2</inf>S<inf>2</inf>O<inf>3</inf>5H<inf>2</inf>O solution was selected for use as a liquid membrane and a receiving solution, respectively. The influence of ferric ions on the pertraction of silver ions was studied firstly using wastewater with normal ferric ion concentration and secondly using wastewater with ferric ion precipitation by phosphoric acid solution. The highest pertraction of silver ions was achieved by using 0.1M of LIX 84-I and 0.5M of Na<inf>2</inf>S<inf>2</inf>O<inf>3</inf>·5H<inf>2</inf>O solution at pH of feed and receiving solutions of 3.5 and 2. The flow rates of feed and receiving solutions were 0.2dm3/min. 0.6mg/dm3 of silver ions that remained in the wastewater was below the mandatory discharge limit. No effect of normal ferric ion concentration in the wastewater on silver ion pertraction was observed. The crucial parameters were defined to confirm the efficiency and reliability of the system. Finally, the controlling transport regime of silver ion pertraction across HFSLM was determined by the diffusion flux and reaction flux models.
Some of the metrics are blocked by your
consent settings
Experiments and thermodynamic models for ternary (liquid-liquid) equilibrium systems of water + cyclopentanone + organic solvents at T = 298.2 K
(2014-08-01)
Wongsawa, Thidarat
;
Hronec, Milan
;
Lothongkum, Anchaleeporn Waritswat
;
Pancharoen, Ura
;
Phatanasri, Suphot
The aim of this paper is to obtain liquid-liquid equilibrium (LLE) data for cyclopentanone extraction. Ternary LLE systems of water + cyclopentanone + organic solvents (MIBK, ethyl acetate, furfural or n-butanol) were investigated at T = 298.2 K and atmospheric pressure. The solubility and tie-line data of these ternary LLE systems were determined by direct analysis. The reliability of the LLE experimental results was validated by the Othmer-Tobias and Hand correlation equations. Distribution coefficients (D) and separation factors (S) were calculated in order to evaluate the capability of selective organic solvents for cyclopentanone extraction. NRTL and UNIQUAC models were employed to correlate the results obtained by the modeling with the experimental data. Good correlation results were confirmed by the rmsd values of less than 6%. © 2014 Elsevier B.V.
Some of the metrics are blocked by your
consent settings
Thermodynamic models for determination of the solubility of 2,5-bis(2-furylmethylidene)cyclopentan-1-one in different solvents at temperatures ranging from 308.15 to 403.15K
(2014-04-15)
Prapasawat, Tatchanok
;
Hronec, Milan
;
Štolcová, Magdaléna
;
Lothongkum, Anchaleeporn Waritswat
;
Pancharoen, Ura
The solubility data of 2,5-bis(2-furylmethylidene)cyclopentan-1-one (F<inf>2</inf>C) in solid-liquid equilibrium in alternative solvents are vital for a preliminary study of industrial applications aimed at producing sustainable and renewable materials and fuels. The solubility behavior of F<inf>2</inf>C in different solvents, such as tetrahydrofuran, mixed water-tetrahydrofuran (1:1, v/v), methanol, and water at temperatures ranging from 308.15 to 403.15K was investigated. An isothermal method was employed to measure the solubility data of F<inf>2</inf>C. The experimental data showed that the solubility of F<inf>2</inf>C increased as the temperature increased and was strongly affected by the surface tension and polarity index. The solubility of F<inf>2</inf>C in the studied solvents increased in the following order: H<inf>2</inf>O<methanol<H<inf>2</inf>O-THF mixture<THF. The thermodynamic models, such as the polynomial empirical equation, the Van't Hoff, and the modified Apelblat models were investigated to describe the experimental data. It was found that the modified Apelblat model was the most suitable for predicting the solubility behavior of F<inf>2</inf>C with a temperature increment. The calculated thermodynamic parameters indicated that in each studied solvent the dissolution process of F<inf>2</inf>C is endothermic and spontaneous. © 2014 Elsevier B.V.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results