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Lignocellulose digestion

Corn stover, a well-known example of lignocellulosic biomass, is a potential renewable feed for bioethanol production. Dilute sulfuric acid pretreatment removes hemicellulose and makes the cellulose more susceptible to bacterial digestion. The rheologic properties of corn stover pretreated in such a manner were studied. The Power Law parameters were sensitive to corn stover suspension concentration becoming more non-Newtonian with slope n, ranging from 0.92 to 0.05 between 5 and 30% solids. The Casson and the Power Law models described the experimental data with correlation coefficients ranging from 0.90 to 0.99 and 0.85 to 0.99, respectively. The yield stress predicted by direct data extrapolation and by the Herschel-Bulkley model was similar for each concentration of corn stover tested. [Pg.347]

Digestion of lignocellulose, to render it susceptible to hydrolysis, can be performed in a number of ways [10, 13, 14] but few of these satisfy the green commandments. There seems to be a trend towards aqueous pretreatment, such as the steam explosion that is used by Iogen (Canada) [15, 16], followed by enzy-... [Pg.332]

Many factors influence the reactivity and digestibility of the cellulose fractions of lignocellulose materials. These factors include Hgnin and hemicellulose content, crystalhnity of cellulose, and the porosity of the biomass materials. Pretreatment of Hgnocellulosic materials prior to utiHzation is a necessary element in biomass-to-ethanol conversion processes. The objective of the pretreatment is to render biomass materials more accessible to either chemical or enzymatic hydrolysis for efficient product generation. The goals of the pretreatment are ... [Pg.216]

A Mechanism for Improving the Digestibility of Lignocellulosic Materials with Dilute Alkali and Liquid Ammonia... [Pg.205]

Thus, evidence is considerable that mild NaOH treatment of selected lignocellulosic materials increases the digestibility of their carbohydrate fractions. To know the maximum benefits possible from this treatment, it is helpful to know the mechanism for obtaining the improvement. [Pg.209]

Chemical Changes that Occur when Hardwoods Are Treated with Ammonia. Because the action of liquid NH3 on wood could be of interest for increasing the digestibility of lignocellulosic material, the work of Wang et al. (48) becomes pertinent. They showed that ammonolysis does occur, and determined the relative amount of nitrogen present as ammonium salts and as amide groups in ammonia-treated birch. [Pg.213]


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See also in sourсe #XX -- [ Pg.332 ]




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