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Author: search.filters.author.Na-Ranong, DuangkamolSubject: search.filters.subject.Biodiesel

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    Biodiesel produced from transesterification of palm oil using NaOH-treated activated carbon and pyrolytic char of used tires as catalysts
    (2025-03-01)
    Chana, Khulanuttha
    ;
    Chen, Bing Hung
    ;
    Na-Ranong, Duangkamol
    Biodiesel produced from catalyzed transesterification of palm oil with methanol using NaOH-treated carbonaceous catalysts was studied and reported. Particularly, effect of the carbonaceous support, i.e. activated carbon (AC) and pyrolytic char of end-of-life used tire (TPC), on the yield of biodiesel was investigated. The resultant yield of biodiesel near 98.5 % could be attained from transesterification reactions conducted with a catalyst loading at 5 wt% of palm oil initially used, under a molar ratio of methanol/oil at 21/1, at 65°C and 180 min for reaction temperature and time. The kinetics of the transesterification reaction could be fitted satisfactorily with the pseudo first-order model. The Arrhenius behavior was observed from the temperature-dependent rate constants, leading to an activation energy at 111.2 kJ/mol if AC-supporting catalyst was used. Both AC and TPC-supporting catalysts could produce biodiesel with a yield greater than 90 % even after the fourth cycles of catalyzed transesterification reactions. Notably, the feasibility in the upcycling of TPC as catalyst support was demonstrated in this work.
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    Removal of steryl glucosides in palm oil based biodiesel using magnesium silicate and bleaching earth
    (2015-03-01)
    Na-Ranong, Duangkamol
    ;
    Laungthaleongpong, Pattarin
    ;
    Khambung, Suttirat
    Steryl glucosides (SG) may cause problems including accumulation in downstream equipment in production line, storage stability of biodiesel and filter plugging in a diesel engine. In this study, adsorption was used as a post-treatment method to reduce the amount of SG in biodiesel. Commercial grade magnesium silicate (MS) and bleaching earth (BE) were selected as potential adsorbents for SG removal and their performances were evaluated comparatively. To investigate effects of important operating parameters (adsorption time, adsorbent loading and temperature), batch adsorption experiment was performed using palm oil based biodiesel containing 97.6 mg kg<sup>-1</sup> of SG as a feedstock. The results revealed that efficiency in SG removal of MS was higher than that of BE. In the tested range of 65-80 °C, by treating with 1 wt% of adsorbent, MS could reduce about 81.4-82.5% of SG, whereas BE could reduce only about 48.6-58.9% of SG. Only at low adsorbent loading, the efficiencies of both MS and BE were significantly affected by temperature and then reached the maximum values at temperatures around 70-75 °C. Due to the adsorption treatment, mono-, di- and triglycerides were simultaneously removed and the maximum selectivities towards SG adsorption of MS and BE were 11.8% and 13.5%, respectively. In addition, this adsorption treatment provides the higher efficiency in reduction of the concentration of SG (approx. 20 mg kg<sup>-1</sup> within 10 min), comparing to a conventional method.
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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.