As an innovative and adaptable class of solvents, ionic liquids (ILs) facilitate the efficient conversion of lignocellulosic biomass into biofuels by pretreating the biomass. This chapter provides an extensive analysis of the application of ILs in biomass pretreatment for biorefinery purposes. It includes detailed discussions on the structure and durability of lignocellulose as well as its dissolution mechanisms. Furthermore, this chapter evaluates sustainable factors from both economic and ecological perspectives, addresses challenges associated with IL recovery and recycling, and examines emerging opportunities in IL-based biomass refineries. There is considerable interest in the use of ionic liquids, known for their physicochemical properties, such as low vapor pressures, high thermal stability, and tunable solubility, to enhance lignocellulosic biofuel pretreatment efficiency. To deconstruct lignocellulose, which includes cellulose, hemicellulose, and lignin, and use it for biofuel production, there are substantial challenges involved. ILs facilitate the breakdown of these components through various mechanisms, including ion exchange, hydrogen bonding, and π-π interactions. Through an analytical lens, this chapter examines the molecular interactions between ILs and lignocellulosic polymers, elucidating how specific ionic liquid formulations can be optimized to maximize biomass dissolution while minimizing energy input and environmental footprint. The sustainability assessment encompasses a comparative analysis of ILs against conventional solvents, highlighting the long-term benefits and trade-offs in terms of biodegradability, toxicity, and cost-effectiveness. Additionally, the recyclability of ILs is scrutinized, considering the technological advancements in IL recovery processes and their implications for circular economy models in biorefineries. Emerging opportunities for IL applications are explored, including advancements in designer ILs tailored for targeted biomass components and the integration of IL pretreatment with downstream enzymatic or microbial hydrolysis. The convergence of IL technology with recent innovations in biorefinery infrastructure promises to drive forward the development of more sustainable, economically viable biofuel production pathways.

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Ionic Liquids in the Pretreatment of Plant Biomass: Sustainable Pathways for Biorefinery Applications

  • Sharmistha Sharma,
  • Anjali Roy,
  • Himanshu Kishore Prasad

摘要

As an innovative and adaptable class of solvents, ionic liquids (ILs) facilitate the efficient conversion of lignocellulosic biomass into biofuels by pretreating the biomass. This chapter provides an extensive analysis of the application of ILs in biomass pretreatment for biorefinery purposes. It includes detailed discussions on the structure and durability of lignocellulose as well as its dissolution mechanisms. Furthermore, this chapter evaluates sustainable factors from both economic and ecological perspectives, addresses challenges associated with IL recovery and recycling, and examines emerging opportunities in IL-based biomass refineries. There is considerable interest in the use of ionic liquids, known for their physicochemical properties, such as low vapor pressures, high thermal stability, and tunable solubility, to enhance lignocellulosic biofuel pretreatment efficiency. To deconstruct lignocellulose, which includes cellulose, hemicellulose, and lignin, and use it for biofuel production, there are substantial challenges involved. ILs facilitate the breakdown of these components through various mechanisms, including ion exchange, hydrogen bonding, and π-π interactions. Through an analytical lens, this chapter examines the molecular interactions between ILs and lignocellulosic polymers, elucidating how specific ionic liquid formulations can be optimized to maximize biomass dissolution while minimizing energy input and environmental footprint. The sustainability assessment encompasses a comparative analysis of ILs against conventional solvents, highlighting the long-term benefits and trade-offs in terms of biodegradability, toxicity, and cost-effectiveness. Additionally, the recyclability of ILs is scrutinized, considering the technological advancements in IL recovery processes and their implications for circular economy models in biorefineries. Emerging opportunities for IL applications are explored, including advancements in designer ILs tailored for targeted biomass components and the integration of IL pretreatment with downstream enzymatic or microbial hydrolysis. The convergence of IL technology with recent innovations in biorefinery infrastructure promises to drive forward the development of more sustainable, economically viable biofuel production pathways.