Advances in conversion of hemicellulosic biomass to furfural and upgrading to biofuels

Catalysis Science & Technology (Impact Factor: 3.75). 01/2012; DOI:DOI: 10.1039/c2cy20235b

ABSTRACT Recent approaches to furfural synthesis from hemicellulosic biomass and pentose sugars with both homogeneous and solid acidic catalysts have been summarized by addressing the associated sustainability issues. The features of deconstruction of hemicellulosic biomass by acid hydrolysis to produce pentose sugar feedstock for furfural have been discussed in brief. Several strategies including solvent extraction in a biphasic process, application of surface functionalized materials such as acidic resins, mesoporous solids and mechanistic insight in limited cases are discussed. The present status of the promising furfural platform in producing second generation biofuels (furanics and hydrocarbon) is reviewed. The performances of each catalytic system are assessed in terms of intrinsic reactivity and selectivity toward furfural production. Overall, this minireview attempts to highlight the scope of further developments for a sustainable furfural process and upgrading to fuels.

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    ABSTRACT: The effects of three metal chlorides including FeCl 3 , CuCl 2 , and AlCl 3 on corn stover biomass pretreatment and enzymatic hydrolysis were studied under lower severity conditions (reaction temperature of 150−160 °C, salt concentration of 0.075−0.125M, and reaction time of 10 min). The results were compared with dilute sulfuric acid pretreatment at the same conditions. The maximum monomeric xylose yields were observed to be 93 and 94 wt % when CuCl 2 and FeCl 3 were used in the pretreatment at 160 °C for 10 min at 0.125 M concentrations, which were higher than the sulfuric acid pretreatment yields at the same reaction conditions. However, monomeric xylose yield for corn stover pretreated with AlCl 3 was observed to be 8 wt % at the same condition. This could be explained by isomerization of xylose to xylulose and subsequent dehydration into furfural. However, enzymatic digestibility yields for the three metal chloride pretreated samples at 160 °C were greater than 92 wt % . These yields were higher than sulfuric acid pretreated samples at the same reaction conditions. The overall formation of fermentation inhibitor products for samples pretreated with CuCl 2 and FeCl 3 was observed to be similar to the control samples (pretreated with sulfuric acid at the same conditions).
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    ABSTRACT: Samples of Eucalyptus globulus were subjected to isothermal autohydrolysis (temperature: 220–250 °C and isothermal residence time 0–60 min). The effect of the R0 factor on the sugar yield and composition of both liquid and solid phases obtained after the treatments has been studied. The furfural concentration and composition has been determined. A central composite experimental design, in conjunction with the neural fuzzy model, was used to the furfural content maximization under isothermal autohydrolysis. A varied range, involving two independent variables at three different levels, was established for each process variable (viz. temperature and autohydrolysis time). The obtained models reproduced the experimental results of the dependent variables with errors below 6%. Under optimum experimental conditions, the yield of furfural (4.4 g/100 g dry raw material) could be obtained at 60 min and 220 °C).
    Chemical Engineering Journal 04/2013; 221:185-192. · 3.47 Impact Factor


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Sep 3, 2012