A kinetic study of acid catalysed hydrolysis of sugar cane bagasse to levulinic acid

Lactic acid (LA) is a potential platform chemical that can be produced from lignocellulosic biomass. The development of a cost-competitive, catalyticbased LA production system is gaining significant attention in modern biorefineries. A series of experimental study was carried out to investigate the chemocatalytic effect of the conversion of oil palm empty fruit bunch (EFB) fibers into lactic acid under hydrothermal conditions. Synthesis of chemicals from lignocellulosic biomass involves complex mechanisms because of the complex composition of the biomass. Therefore, experimental parameters, i.e., temperature, Pb(II) concentration, and reaction time were studied. It was found that production of LA is highly dependent on the experimental conditions. In this study, the highest LA yield obtained from EFB fibers was > 46% (230 °C, 2 mM Pb(II) after 4 h of reaction). However, a similar yield can be achieved either using higher Pb(II) and shorter reactions time or vice versa. The selective production of chemical compounds (glucose, 5-hydroxymethyl furfural (5-HMF), furfural, levulinic acid, and lactic acid) from EFB fibers is highly dependent on the availability of Pb(II) ions.

Section: Effect Of Temperature and Pb(ii) Ion Concentration On The Prmentioning

confidence: 99%

Catalytic Conversion of Empty Fruit Bunch (EFB) Fibres into Lactic Acid by Lead (II) ions

Chin¹,

Tasirin²,

Chan³

et al. 2016

“…Table 1 shows the concentration profile of the formed degradation compounds in pretreatment spent liquor. During a typical pretreatment process, the cellulose generally is depolymerized to glucose and subsequently converted to HMF, formic acid, and levulinic acid (Girisuta et al 2013). In this work, because of the slight loss of cellulose after MBSP, the concentrations of these degradation compounds from glucose remained at low levels at various pH values.…”

Section: Degradation Compounds Of Lignocelluloses After Pretreatmentmentioning

confidence: 81%

Comparative Evaluation of Magnesium Bisulfite Pretreatment under Different pH Values for Enzymatic Hydrolysis of Corn Stover

Ren

Liu

et al. 2016

During pretreatment, the pretreatment pH often plays an important role in removing hemicelluloses and lignin for improving the conversion of biomass to sugars. In this study, corn stover was subjected to magnesium bisulfite pretreatment (MBSP) under various pH conditions. The obtained data showed that the hemicelluloses and lignin were solubilized by MBSP, which led to changes in the structural and chemical properties of the pretreated material. The pretreatment pH could alter the existing forms of SO2, and magnesium bisulfite was the most effective reagent for removing lignin. A relatively neutral MBSP (pH 5.13) not only considerably improved the enzymatic hydrolysis yield (80.18%), but also produced a large amount of high-value xylo-oligosaccharides in the spent liquor. Furthermore, only the hemicellulose removal showed a linear relationship with the enzymatic hydrolysis yield. These results suggest that removal of all the lignin might not be necessary to improve the hydrolysis efficiency.

“…The authors made use of the model proposed by Girisuta et al (2013) by associating the current experimental data. The model proposed by Girisuta and co-workers also contained four consecutive first-order reactions.…”

Section: Comparisons With Other Modelsmentioning

confidence: 99%

“…Girisuta, Dussan, and co-workers used bagasse as the starting material in the batch reactor for the hydrolysis reaction (Girisuta et al 2013). Compared with the earlier studies of Girisuta, a simpler kinetic model was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…With over 70% yield of LA, the company had applied this technology to start a small-scale industrial production. Later, many studies were conducted on the hydrolysis of various biomass feedstocks, and LA could be produced from grain sorghum, wheat straw, water hyacinth plant, paddy straw, sugarcane bagasse, and corn stalk (Fang and Hanna 2002;Chang et al 2007;Girisuta et al 2008;Yan et al 2008;Girisuta et al 2013;Zhi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Study of Acid Hydrolysis of Corncobs to Levulinic Acid

Liang¹,

Hu²,

Guo³

et al. 2017

Levulinic acid (LA) is an important platform compound that can be obtained from biomass resources. Using corncobs as the raw material that had already removed the hemicellulose, this work studied the relevant hydrolysis kinetics. The kinetic experiments were performed at various temperatures in the range of 150 °C to 180 °C and sulfuric acid concentrations between 0.2 mol/L and 0.8 mol/L in a reactor designed by the authors. The highest yield of LA was obtained at 150 °C and 0.8 mol/L H2SO4 at 58.0 mol%. A new simple kinetic model that consists of four first-order reactions was proposed; the model assumes that humins can be only converted from 5-hydroxymethylfurfural (5-HMF). A modified parameter fitting method that contained equality constraints and a weighted objective function was applied in this study. The kinetic model was in excellent agreement with the experimental data.