Na Ranong, Duangkamol

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Na-Ranong, Duangkamol

Na-Ranong, D.

duangkamol.na@kmitl.ac.th

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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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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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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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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.
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PREPARATION OF ACTIVATED CARBON FROM TIRE DERIVED PYROLYTIC CHAR FOR ADSORPTION OF TETRACYCLINE HYDROCHLORIDE
(2022-12-01)
Chana, Khulanuttha
;
Soisuwan, Sasit
;
Sinpichai, Sarawut
;
Chen, Bing Hung
;
Na-Ranong, Duangkamol
Effects of activation variables on performance of the obtained activated carbon (AC) were investigated for removal of tetracycline hydrochloride (TCH). Pyrolytic char derived from waste tire was chemically activated via two-step of KOH impregnation following by thermal treatment. According to regression analysis and fitting with second-degree polynomial equation, empirical models were developed to correlate performance of AC in TCH adsorption (percentage removal and adsorption capacity at equilibrium) with three activation variables: impregnation ratio (IR), activation temperature (T) and holding time of thermal treatment (t). The analysis of variance indicated that only T, T2 and IR2 were significant to the prediction of both percentage removal and adsorption capacity. According to the developed models, it is suggested that the pyrolytic char should be activated at IR = 6, T = 750 °C and t = 2 h to obtain the highest efficiency of TCH removal in the tested range of activation condition.

Na Ranong, Duangkamol

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