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Empty fruit bunch-lignin depolymerization through aerobic oxidation assisted by magnesium oxide
( Vania Tanda Widyaya ),이현주 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Oxidative depolymerization of empty fruit bunch (EFB)-lignin was carried out in the presence of MgO with mass ratio of EFB:MgO = 1:1. Reaction was conducted for 3 h at 150°C under 500 psi of air. Four reaction medium (THF, H<sub>2</sub>O, CH<sub>3</sub>CN, EtOH) were examined. The effect of MgO and O<sub>2</sub> presence was also investigated. Small amount of volatile fractions including phenol, syringol, vanillin, and syringaldehyde were detected by GC-MS. Structural change of EFB lignin was characterized using FT-IR and 2D HSQC NMR.
Magnesium Oxide-catalyzed Oxidative Depolymerization of EFB Lignin
Vania Tanda Widyaya,Huyen Thanh Vo,Deliana Dahnum,이현주 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
Empty fruit bunch (EFB) lignin, which had been isolated by the previous sulfuric acid treatment of EFB, was oxidized in the presence of a base and air to depolymerize the solvent-insoluble lignin into smaller solvent-soluble molecules. Depending on the types of base and solvent, the yield of solvent-soluble lignin (SSL) varied, and the highest yield of 54% was obtained when MgO and ethanol were used at 150 °C with an air pressure of 500 psig for 3 h. Gel permeation chromatography analysis of the oxidized lignin showed that SSL had decreased molecular weight compared to native EFB lignin.31P NMR experiments revealed that concentrations of hydroxy group and acid group were increased by the oxidation. 2D 1H-13C HSQC NMR was performed, and it was found that the area intensities related to methoxy group and β-O-4′ unit as well as guaiacyl, oxidized syringyl, and p-hydroxybenzoate group were decreased by the oxidation.
Kim, Young Jin,Lee, Jae Hyeok,Widyaya, Vania Tanda,Kim, Hoon Sik,Lee, Hyunjoo Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Ru/C-catalyzed hydrogenation of m-xylylene diamine into 1,3-cyclohexanebis(methylamine) was greatly accelerated by the presence of $LiNO_3$, $NaNO_2$, or $NaNO_3$. It was found that the effect of the nitrate salt was significantly affected by the size of cation. The promoting effect of the nitrate salt increased with the decrease of the cation size: $LiNO_3$ ~ $NaNO_2$ > $KNO_3$ > $CsNO_3$ >> [1-butyl-3-methylimidazolium]$NO_3$. XRD analysis of the recovered catalysts after the hydrogenation reactions showed that $LiNO_3$ and $NaNO_2$ were completely transformed into LiOH and NaOH, respectively, along with the evolution of $NH_3$, while $KNO_3$ and $CsNO_3$ remained unchanged.
Young Jin Kim,Jae Hyeok Lee,Vania Tanda Widyaya,Hoon Sik Kim,Hyunjoo Lee 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Ru/C-catalyzed hydrogenation of m-xylylene diamine into 1,3-cyclohexanebis(methylamine) was greatly accelerated by the presence of LiNO3, NaNO2, or NaNO3. It was found that the effect of the nitrate salt was significantly affected by the size of cation. The promoting effect of the nitrate salt increased with the decrease of the cation size: LiNO3 ~ NaNO3 > KNO3 > CsNO3 >> [1-butyl-3-methylimidazolium]NO3. XRD analysis of the recovered catalysts after the hydrogenation reactions showed that LiNO3 and NaNO3 were completely transformed into LiOH and NaOH, respectively, along with the evolution of NH3, while KNO3 and CsNO3 remained unchanged.