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Author: search.filters.author.Leephisuth, PornyamonSubject: search.filters.subject.Vanillin

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    Optimization of Lignin Conversion by Hydrothermal Method for Recovery of Vanillin
    (2020-10-20)
    Sriprom, Pongsert
    ;
    Leephisuth, Pornyamon
    ;
    Neramittagapong, Arthit
    ;
    Neramittagapong, Sutasinee
    This work aimed to optimize lignin conversion to vanillin by hydrothermal method. An experiment was designed by Box-Benhken Design (BBD). Temperature, NaOH concentration, and reaction time were chosen as independent parameters for achieving the optimum reaction condition. The reaction products were analyzed by high-performance liquid chromatography. Based on the experimental results, the optimum condition for the hydrothermal process was predicted using the response surface method. The maximum vanillin production of 18.1 mg/L was predicted at the optimum condition given by the temperature of 142 °C, NaOH concentration of 9.2 g/L, and reaction time of 32 min. The conversion of lignin to vanillin was experimented using the predicted optimal condition to verify the prediction. It was found that the hydrothermal method at the optimum condition yielded 18.1 ± 2 mg/L of vanillin, which was in good agreement with the predicted value. It was also found that the yield of vanillin was influenced by temperature, NaOH concentration, and the interaction of both parameters, whereas the reaction time was much less influential.
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    Partial oxidation of synthesized wastewater containing lignin to vanillin and phenol under mild conditions
    (2020-02-01)
    Sriprom, Pongsert
    ;
    Leephisuth, Pornyamon
    ;
    Neramittagapong, Arthit
    ;
    Neramittagapong, Sutasinee
    Partial oxidation of synthesized wastewater containing lignin to form phenol and vanillin was investigated. The reactions were carried out in a high-pressure reactor at various temperatures in the range of 140–200 ° C and under the air atmosphere with the initial air pressure of 2 bar for 75 min. The addition of NaOH has a strong effect on the formation of vanillin and phenol. The results showed that the highest vanillin concentration of 23.4 ppm and the highest phenol production of 30 ppm were obtained at a temperature of 140 °C and 200 °C, respectively. The vanillin and phenol can be produced from the partial oxidation of wastewater containing lignin at mild conditions.