Publicação
Integrated processes of pretreatment and enzymatic hydrolysis of cellulosic biomass
| Resumo: | The upgrade of lignocellulosic biomass into biofuels and added-value products in the biorefinery’s biochemical platform involves several steps, most commonly biomass pretreatment, enzymatic hydrolysis (and enzyme production), and fermentation, and the integration of these steps is a necessity due to efficiency, economic, and environmental reasons. To achieve this goal, four main approaches are currently available. These include the two most studied approaches, (i) SH(C)F, separate hydrolysis and (co-)fermentation, and (ii) SS(C)F, simultaneous saccharification and (co-)fermentation, and two alternative approaches: (iii) the CBP, consolidated bioprocessing, where polysaccharides hydrolysis of the pre-treated biomass is accomplished by an enzyme-microorganism-based system, and (iv) the most innovative and yet less studied CPH, combined pretreatment and hydrolysis that encompasses the one-pot, multi-reaction processes involving pretreatment and hydrolysis. Following a brief presentation and discussion of the current advantages/(dis)advantages of the pretreatment process choices, and the enzyme hydrolysis, this chapter reviews the current state of the art of the process integration strategies, taking special attention to the most innovative ones highlighting the requirements for a fruitful combination of the physical, chemical, physico-chemical, enzymatic, and microbial processes to break down the complex structure of the biomass to make its upgrade easier. Special attention will be given to the use of low-temperature-based processes, new solvents (e.g., ionic-liquids, deep eutectic solvents), as well as the new use of extremophilic conditions-tolerant enzymes acting both on the polysaccharidic and lignin biomass fractions. New research and development paths are deemed to be derived more from the process intensification, integration, and consolidation side, rather than from the development of independent innovative approaches. Furthermore, integration strategies that allow higher efficiency in the biomass co-upgrade into biofuels and co-products should also be favored. |
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| Autores principais: | Carvalheiro, Florbela |
| Outros Autores: | Caturra, Júnia; Fernandes , Maria C.; Duarte, Luís C. |
| Assunto: | Bioethanol Biofuels Biomass fractionation Biomass pretreatment Biorefinery process intensification Cellulases Consolidated bioprocessing Enzymatic hydrolysis Hemicellulases Process integration |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | capítulo de livro |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Instituto Politécnico de Beja |
| Idioma: | inglês |
| Origem: | Repositório Institucional do IPBeja |
| Resumo: | The upgrade of lignocellulosic biomass into biofuels and added-value products in the biorefinery’s biochemical platform involves several steps, most commonly biomass pretreatment, enzymatic hydrolysis (and enzyme production), and fermentation, and the integration of these steps is a necessity due to efficiency, economic, and environmental reasons. To achieve this goal, four main approaches are currently available. These include the two most studied approaches, (i) SH(C)F, separate hydrolysis and (co-)fermentation, and (ii) SS(C)F, simultaneous saccharification and (co-)fermentation, and two alternative approaches: (iii) the CBP, consolidated bioprocessing, where polysaccharides hydrolysis of the pre-treated biomass is accomplished by an enzyme-microorganism-based system, and (iv) the most innovative and yet less studied CPH, combined pretreatment and hydrolysis that encompasses the one-pot, multi-reaction processes involving pretreatment and hydrolysis. Following a brief presentation and discussion of the current advantages/(dis)advantages of the pretreatment process choices, and the enzyme hydrolysis, this chapter reviews the current state of the art of the process integration strategies, taking special attention to the most innovative ones highlighting the requirements for a fruitful combination of the physical, chemical, physico-chemical, enzymatic, and microbial processes to break down the complex structure of the biomass to make its upgrade easier. Special attention will be given to the use of low-temperature-based processes, new solvents (e.g., ionic-liquids, deep eutectic solvents), as well as the new use of extremophilic conditions-tolerant enzymes acting both on the polysaccharidic and lignin biomass fractions. New research and development paths are deemed to be derived more from the process intensification, integration, and consolidation side, rather than from the development of independent innovative approaches. Furthermore, integration strategies that allow higher efficiency in the biomass co-upgrade into biofuels and co-products should also be favored. |
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