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Heat and Mass Transport in Processing of Lignocellulosic Biomass for Fuels and Chemicals

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Sustainable Biotechnology

Abstract

Lignocellulosic biomass, a major feedstock for renewable biofuels and chemicals, is processed by various thermochemical and/or biochemical means. This multi-step processing often involves reactive transformations limited by heat and mass transport. These limitations are dictated by restrictions including (1) plant anatomy, (2) complex ultra-structure and chemical composition of plant cell walls, (3) process engineering requirements or, (4) a combination of these factors. The plant macro- and micro-structural features impose limitations on chemical and enzyme accessibility to carbohydrate containing polymers (cellulose and hemicellulose) which can limit conversion rates and extents. Multiphase systems containing insoluble substrates, soluble catalysts and, in some cases, gaseous steam can pose additional heat and mass transfer restrictions leading to non-uniform reactions. In this chapter, some of these transport challenges relevant to biochemical conversion are discussed in order to underscore the importance of a fundamental understanding of these processes for development of robust and cost-effective routes to fuels and products from lignocellulosic biomass.

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Acknowledgements

This work was funded by the US DOE Office of the Biomass Program. The authors also acknowledge the valuable intellectual insights provided by Dr. James McMillan, National Bioenergy Center, National Renewable Energy Laboratory, on issues related to transport processes in biochemical conversion of lignocellulosic biomass.

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Correspondence to Sridhar Viamajala .

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Viamajala, S. et al. (2010). Heat and Mass Transport in Processing of Lignocellulosic Biomass for Fuels and Chemicals. In: Singh, O., Harvey, S. (eds) Sustainable Biotechnology. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3295-9_1

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