Na Ranong, Duangkamol

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Na-Ranong, Duangkamol

Na-Ranong, D.

duangkamol.na@kmitl.ac.th

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Recovery of useful chemicals from oil palm shell-derived oil using zirconia supporting iron oxide catalysts
(2008-05-01)
Na-Ranong, Duangkamol
;
Yuangsawad, Ratanaporn
;
Tago, Teruoki
;
Masuda, Takao
The possibility for recovering methanol, acetic acid and phenol from oil palm shell-derived oil was investigated. Thermal cracking mainly produced a solid residue and was not a suitable method for recovering these three target chemicals. When zirconia supporting iron based catalyst (Zr/FeOx, Zr-FeOx or Zr-Al-FeOx) was applied, the "others"-unidentified hydrocarbons-were satisfactorily removed without formation of a solid residue while these target compounds were considerably stable over these catalysts. Zr-Al-FeOx showed the highest activity for oxidation of the oil to CO<inf>2</inf>. Effect of operating parameters (steam to oil ratio, temperature and time factor) on its performance was further investigated. In order to gain insight into the reaction path, the reaction using model compounds (methanol, acetic acid, acetone, ethyl acetate and phenol) was performed. © 2008 Springer.
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Free sterols from acid hydrolysis of steryl glucosides
(2021-05-20)
Yuangsawad, Ratanaporn
;
Sinpichai, Sarawut
;
Sukra, Arunrot
;
Na-Ranong, Duangkamol
Steryl glucosides (SG) are a group of insoluble chemicals in biodiesel. Steryl glucosides may cause clogging in production line and even small amounts of them may also cause low storage stability of biodiesel and plugging in a diesel engine. Therefore, an additional separation step is required to remove these contaminants. Since steryl glucosides have low solubility in many organic solvents, it is difficult to utilize the solid waste generated from the separation. Transformation of steryl glucosides to the form that are more soluble in general organic solvents should increase feasibility of utilization of the solid waste. In this study, hydrolysis of steryl glucosides to free sterols (FS) was investigated using nontoxic organic acid as catalyst. The hydrolysed products obtained from citric, lactic, and acetic acids were identified using a gas chromatograph connected with a mass spectrometer (GC-MS). The amounts of steryl glucosides and free sterols were also measured to compare efficiency of the catalysts. The most suitable catalyst was selected according to conversion of steryl glucoside (XSG), selectivity to free sterols (SFS), and yield of free sterols (YFS). To determine important parameters effecting the steryl glucosides conversion, the reaction test was performed with the selected catalyst at various operating condition.
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Application of periodic operation to kinetic study of NO-CO reaction over Rh/Al2O3
(2009-02-01)
Na-Ranong, Duangkamol
;
Yuangsawad, Ratanaporn
;
Kitchaiya, Prakob
;
Aida, Takashi
A concentration forcing periodic operation has been applied incorporating with a conventional steady-state rate measurement in order to study the kinetics of NO-CO reaction over Rh/Al<inf>2</inf>O<inf>3</inf> at 423 K. The steady-state rate data obtained using a differential fixed-bed reactor showed that the order of the reaction was 0 with respect to CO concentration (C<inf>CO</inf>) and 0.4 with respect to NO concentration (C<inf>NO</inf>). Under the periodic condition, where a square wave was applied for NO and CO feeding, a deformation of the C<inf>NO</inf> wave was observed at the outlet of an integral fixed-bed reactor. Shape of the deformed C<inf>NO</inf> wave indicates that both reactants were strongly adsorbed on catalytic active sites. Three plausible mechanisms that could explain the strong adsorption of these two reactants together with insignificant self-inhibition effect of the strong adsorption on the rate were considered: (I) Langmuir-Hinshelwood (L-H), (II) Eley-Redial-like (E-R-like) and (III) combined L-H and E-R-like mechanisms. A one-dimensional pseudohomogeneous reactor model coupled with the reaction mechanisms was employed to simulate the characteristics of the rate data and the shape of the deformed C<inf>NO</inf> wave. Only the E-R-like mechanism could predict these characteristics of steady and periodic operations by employing one set of kinetic parameters while the other mechanisms needed different sets of the parameters to predict the characteristics. Sensitivity of each parameter to the shape of the C<inf>NO</inf> wave was analyzed and value of each parameter was determined for the E-R-like mechanism. The reliabilities of the proposed mechanism and its parameters were evaluated. © 2008 Elsevier B.V. All rights reserved.
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Kinetics and Equilibrium Modeling of Sterol Adsorption on Styrene-Divinylbenzene Cation-Exchange Resins
(2019-04-01)
Yuangsawad, Ratanaporn
;
Sinpichai, Sarawut
;
Bhamarasuta, Thanutchaporn
;
Ladadok, Chinakrit
;
Panchanon, Surakan
The potential of recovering phytosterols from fatty acid methyl esters by an adsorption-desorption process is demonstrated using a strong-acid ion-exchange styrene-divinylbenzene resin (SA-R) as an adsorbent and ethanol as a desorbent. Since the operating cost of the overall process significantly depends on the efficiency of SA-R in the adsorption step, the behavior of SA-R in sterol adsorption is investigated in detail using a model solution of stigmasterol in n-heptane. The results indicate that stigmasterol was associatively and exothermically adsorbed on SA-R. Based on the experimental results, a simple pseudo-second-order model and a modified Langmuir isotherm with their parameters, which well predicted kinetics and adsorption capacity of SA-R, are proposed.
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Synthesis of molecularly imprinted polymer for sterol separation
(2016-06-28)
Yuangsawad, Ratanaporn
;
Chuayrueng, Nuengruthai
;
Nonthanasin, Nattawat
;
Binabdullah, Krittin
;
Na-Ranong, Duangkamol
Molecular imprinted polymer (MIP) was prepared by bulk polymerization in acetone using acrylamide as a functional monomer, ethylene glycol dimethacrylate as a crosslinker, stigmasterol as a template and benzoyl peroxide as an initiator. The obtained MIPs were characterized using a scanning electron microscope and a fourier transform infrared spectrophotometer. Performance in sterol adsorption of MIPs prepared under various conditions was investigated using a model solution of phytosterols in heptane, comparing with a nonimprinted polymer (NIP). Statistical analysis revealed that the amounts of crosslinker and template strongly affected the performance of MIP while the amount of solvent slightly affected the performance of MIP. MIP synthesized under the optimal condition had adsorption capacity of 1.28 mgsterols/gads which were 1.13 times of NIP.
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EFFECTS OF ACID AND ALKALINE TREATMENTS ON EFFICIENCY OF DIATOMACEOUS EARTH IN REMOVAL OF TETRACYCLINE IN AQUEOUS SOLUTION
(2023-09-01)
Sinpichai, Sarawut
;
Yuangsawad, Ratanaporn
;
Na-Ranong, Duangkamol
Contamination of tetracycline (TC) in environment may cause serious problems relating to increase of antibiotic resistance and development of new deceases. This paper focuses on TC removal by simple adsorption treatment and utilization of natural diatomaceous earth (NDE) as a cheap adsorbent. To improve efficiency of NDE, an impregnation method using acid (H2SO4) or base (KOH) was applied to modify NDE and influences of important activation parameters, concentration of reagent (Creagent), ratio of NDE weight and activating solution volume (NDE-to-Sol), temperature (Tact) and time (tact), on the efficiencies of the obtained acid and base activated diatomaceous earths (ADE and BDE) were investigated. Batch adsorption experiment was performed at the same condition to evaluate TC adsorption capacities at equilibrium (qe, TC) of NDE, ADE and BDE. It was found that acid activation negatively affected qe, TC and increases of CH2SO4, Tact and tact resulted in poorer ADE. In contrast, qe, TC was successfully enhanced through activation by KOH; Tact and tact played more significant roles on the enhancement, comparing with CKOH and NDE-to-Sol; impregnation at higher Tact and longer tact could improve efficiency of BDE and the best BDE (BDE-B) with the highest qe, TC (86.31 mg/g) was obtained at 3 M, 0.1 g/ml, 80 °C and 9 h.

Na Ranong, Duangkamol

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