Lignocellulose bioethanol production

Gonzalez-Garcfa, S., Moreira, M. T., Feijoo, G. (2010b). Environmental performance of lignocellulosic bioethanol production from Alfalfa stems. Biofuels, Bioproducts and Biorefining, 4, 118—131. 

Martin, M. Grossmann, I.E. (2011) Energy optimization of lignocellulosic bioethanol production via gasification. AIChE J., 57(12), 3408-3428. 

The expansion of the market, however, will depend considerably on the possibility of an efficient use of other biomass sources, particularly lignocellulosic-based materials, fast growing dedicated crops, and waste resources. Effective integration of bioethanol production into biorefineries will also be a key aspect in decreasing the price by a better use of all the components of biomass. 

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. 

Now the bioethanol is a dominant biofuel and the demand for the bioethanol continues to increase steadily for several decades [1]. To overcome the shortage of raw material, the technology developments for bioethanol production from lignocellulosic biomass have been carried out intensively. Since the collection cost of the wood biomass is too high in Korea,... 

Gurrently, bioethanol is the main product produced from lignocellulosic feedstock. The process of bioethanol production from lignocellulose is currently tested in pilot plants in different countries all over the world, and according to Tan et al. [23] it is consisting of the following steps as discussed next (see Figure 5.6). 

Figure 5.6 Bioethanol production from lignocellulosic biomass (according to Tan [23]).

Galbe M, Zacchi G. (2007). Pretreatment of lignocellulosic materials for efficient bioethanol production. Biofuels, 108, 41-65. 

In summary, currently there is no method that could meet all the requirements for the pre-treatment of lignocellulosic raw materials. Table 6.2 compares the advantages and disadvantages of various methods that are commonly used in the advanced generation bioethanol production process. 

As cellulose only represents 30-40% of the lignocellulosic biomass, the utilization of only glueose in the fermentation would undeniably have an effect on the overall biomass to ethanol conversion yield. Therefore, it is necessary to eonsider the utilization of the hemicellulose hydrolysate in the development of the advanced generation bioethanol production process. ... 

Life cycle assessment (LCA) has been suggested as a suitable methodology to assess the environmental impact of 2G bioethanol production in order to identify the most appropriate conversion technologies and lignocellulosic feedstock. Numerous studies can be found in the literamre that focused on the environmental... 

Samsuri, M., M. Gozan, B. Prasetya, and M. Nasikin. 2009. Enzymatic Hydrolysis of Lignocellulosic Bagasse for Bioethanol Production. Journal of Biotechnology Reseaech in Tropical Region 2 (2) l-5. 

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