Na Ranong, Duangkamol

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Na-Ranong, Duangkamol

Na-Ranong, D.

duangkamol.na@kmitl.ac.th

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Kinetics, isotherm, and thermodynamics of adsorption of sterol on strong acid ion exchange resin
(2018-01-01)
Ladadok, Chinakrit
;
Yamaki, Takehiro
;
Matsuda, Keigo
;
Matsumoto, Hideyuki
;
Na-Ranong, Duangkamol
Kinetics, isotherm and thermodynamics of sterol adsorption on styrene-divinylbenzene based ion-exchange resin with strong acid was investigated at temperature in the range of 298 to 313 K using a model solution of stigmasterol in n-heptane with initial concentration in the range of 0.3×10-3 to 1.8×10-3 kg/kg-solution. Adsorbent (5 wt%) was added to the model solution and isothermal adsorption was performed at 3.33 rps for 7.2×103 s. Kinetics of sterol adsorption was analysed based on pseudo-first-order and pseudo-second-order models. The results revealed that pseudo-second-order model agreed with the experimental data, much better than pseudofirst- order model. At the equilibrium of adsorption, adsorption capacity (qe) decreased when the temperature was increased. This result indicated that sterol adsorption was exothermic. Analysis of adsorption isotherm data based on Langmuir, Freundlich and linear models showed that Freundlich was the best model that could predict the adsorption isotherm data. Adsorption equilibrium constants calculated based on Freundlich model at various temperatures were used to calculate Gibb's free energy change (ΔG), enthalpy change (ΔH), and entropy change (ΔS). The increase of ΔG with respect to temperature indicated that the adsorption was more favourable at lower temperatures. The negative value of ΔH indicated that the adsorption was exothermic and agreed well with the effect of temperature on adsorption capacity. The negative value of ΔS indicated associative adsorption and decrease of the randomness between the solid/liquid interfaces due to the adsorption.
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Comparison of catalytic performances of La203/Ca0 and Mn/Na2W04/Si02 in packed bed reactors for oxidative coupling of methane
(2018-01-01)
Bhamarasufa, T.
;
Na-Ranong, D.
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Oxidative cracking of aromatic compounds related to lignin constituents with steam using ZrO2-Al2O3-FeOx catalyst
(2010-10-22)
Yoshikawa, Takuya
;
Na-Ranong, Duangkamol
;
Tago, Teruoki
;
Masuda, Takao
The catalytic activity of iron oxide composite catalyst (ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf>) was investigated for converting aromatic compounds derived from plant biomass into useful aromatics. Catalytic cracking of lignin constituent-related di-aroatics such as diphenyl ether, diphenyl methane, and 2-benzyloxyphenol, and mono-aromatics such as guaiacol, acetophenone, and 1-phenyl-1-propanol was carried out over ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf>. The catalytic reactions were conducted in a fixed-bed reactor at 773 K under atmospheric pressure. Diphenyl ether and diphenyl methane were stable, whereas 2-benzyloxyphenol was thermally decomposed, followed by the production of toluene and phenol over ZrO<inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO <inf>x</inf>. Guaiacol and acetophenone were selectively converted into 54 C-mol% of phenol and 29 C-mol% of benzene, respectively. The methoxy and carbonyl groups were decomposed into gaseous products mainly consisting of CO<inf>2</inf>, whereas dehydration of the aliphatic hydroxyl group in 1-phenyl-1-propanol mainly occurred to produce 1-phenyl-1-propene. ZrO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-FeO<inf>x</inf> catalyst is effective for degrading alkyl ether bonds between aromatic rings, and the ring substituent methoxy and carbonyl groups.
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Synthesis of moleculary imprinted polymer originated from TFMAA and TRIM for sterol separation
(2018-01-01)
Ladadok, Chinakrit
;
Sinpichai, Sarawut
;
Nonthanasin, Nattawat
;
Binabdullah, Krittin
;
Na-Ranong, Duangkamol
Molecular imprinted polymer (MIP) was synthesized bulk polymerization using 2-(trifluoromethyl)acrylic acid (TFMAA) as a functional monomer, trimethylolpropane trimethacrylate (TRIM) as a cross-linker, benzoyl peroxide as an initiator, acetone as porogen solvent, and stigmasterol as template molecule to obtain adsorbent having high affinity and selectivity to stigmasterol for separation of stigmasterol or other sterols in liquid phase. Functional groups and the morphology of the obtained MIP were investigated by Fourier transform infrared (FTIR) and scanning electron microscope (SEM), respectively. The performance in sterol adsorption of MIPs synthesized under various conditions was investigated using a model solution of sterol mixture in n-heptane with initial concentration of 1.40×10-4 kg/kg-solution comparing with non-imprinted polymer (NIP). Adsorbent (1 wt%) was added to model solution and shaken in an orbital shaker at 3.67 rps, 303 K for 2.16×104 s. The analysis of variance (ANOVA) suggested that the cross-linker was more influential factor on the adsorption performance of MIP as compared to the template molecule and solvent. The optimization showed that MIP synthesized at 0.5×10-3 mol of cross-linker, 1.0×10-4 mol of template molecule, and 1.0×10-5 m3 of solvent had highest percentage adsorption of 57.73 % which was 1.37 times of NIP.
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Synthesis of moleculary imprinted polymer originated from TFMAA and TRIM for sterol separation
(2018-01-01)
Ladadok, C.
;
Sinpichai, S.
;
Nonthanasin, N.
;
Binabdullah, K.
;
Na-Ranong, D.
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Comparing efficiencies of selected ion exchange resins in removing steryl glucosides in biodiesel
(2014-01-01)
Na-Ranong, D.
;
Thaikan, H.
;
Laungthaleongpong, P.
;
Khambung, S.
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Precipitation above cloud point in palm oil based biodiesel during production and storage
(2014-04-15)
Na-Ranong, Duangkamol
;
Kitchaiya, Prakob
Precipitation of a white solid in palm oil based biodiesel (PO-B100) can be found even in PO-B100 that contains minor contaminants (i.e. mono-, di- and triglycerides) within the limitation according to EN-14214 and Thailand's regulation. To identify compounds causing this precipitation, the precipitates collected at the temperature near cloud point and at room temperature were characterized using a gas chromatograph-flame ionization detector, gas chromatograph-mass spectrometry and fourier transform-infrared. The result indicated that the compounds causing the precipitation were steryl glucosides, not glycerides, regardless of temperature. Therefore, effect of steryl glucosides on precipitation time was further investigated using PO-B100s with different amounts of steryl glucosides, mono-, di- and triglycerides. The result revealed that precipitation time of the PO-B100 with high concentration of steryl glucosides was much less than the one without steryl glucosides and decreasing steryl glucosides concentration to 20 ppm significantly improved storage stability of PO-B100. In addition, the precipitation time was not influenced by concentration of mono-, di- and triglycerides. © 2014 Elsevier Ltd. All rights reserved.
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Kinetics, isotherm and thermodynamics of adsorption of sterol on strong acid ion exchange resin
(2018-01-01)
Ladadok, C.
;
Na-Ranong, D.
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Removal of steryl glucosides in palm oil based biodiesel by adsorption on an acid treated resin
(2012-12-01)
Na-Ranong, D.
;
Kitchaiya, P.
;
Yuangsawad, R.
A study was performed to identify the minor components causing the precipitate formation in palm oil based biodiesel (PO-B100) and to remove the components from PO-B100 by selective adsorption using an acid treated resin (H-resin). The adsorption capacity of the H-resin was measured under isothermal condition using batch adsorption experiments. The contents of glycerol, mono-, di-, and triglycerides in the obtained PO-B100 were acceptable according to ASTM D6584. The steryl glucosides (SGs) adsorption capacity of the H-resin was 128 mg<inf>SGs</inf>-g<inf>resin</inf>. To regenerate the adsorbent, the desorption of SGs using several organic solvents was also studied. This is an abstract of a paper presented at the CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (Prague, Czech Republic 8/25-29/2012).
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Kinetics, isotherm and thermodynamics of sterol adsorption on styrene-divinylbenzene anion-exchange resins
(2018-10-01)
Ladadok, Chinakrit
;
Yamaki, Takehiro
;
Matsuda, Keigo
;
Matsumoto, Hideyuki
;
Na-Ranong, Duangkamol
Phytosterols can be recovered from natural resources using molecular distillation, cold crystallization, which require large energy consumption. Adsorption was considered as a feasible alternative method. In this study, kinetics, isotherm and thermodynamics of stigmasterol adsorption on styrene-divinylbenzene with two different functional groups, strong base (SB-R) and weak base (WB-R), were investigated using a model solution of stigmasterol in n-heptane. Isothermal adsorption experiments were performed in temperature range of 298-313 K and concentration range of 0.3-6.0 mg/g<inf>sol</inf>. For both SB-R and WB-R cases, kinetics of adsorption was analysed based on pseudofirst- order and pseudo-second-order models and the results revealed that pseudo-second-order model agreed with the experimental data much better than pseudo-first-order model. Analysis of isotherm data based on Langmuir, Freundlich and linear models showed that Freundlich was the best model that could predict behaviour of sterol adsorption for both SB-R and WB-R cases. In addition, thermodynamics parameters (δG, δH andδS) indicated that the sterol adsorptions on these adsorbents were spontaneous, exothermic and favourable at low temperature.

Na Ranong, Duangkamol

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