Deep Eutectic Solvents as Medium for Pretreatment of Biomass

Abstract

In the field of green chemistry is the study of new solvent systems the great challenge. Deep eutectic solvents (DESs) represent the principles of green chemistry. Currently are preferred these new types of chemicals suitable for the selective removal of extractives, lignin or polysaccharides from biomass. Biomass is selectively treated to the individual fractions, of which is possible with following purification to obtain products in higher yields and purity. In this work are describes various deep eutectic solvents, which can be used for pretreatment of biomass.

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

“…Francisco et al reported that DESs have high lignin solubility and very poor or negligible cellulose solubility, [69] and the properties of DESs can be easily tuned by changing the HBDs and HBAs. [70] Mechanism investigation revealed that the functional groups in the DESs significantly affected their ability to dissolve lignin, [71] and they evaluated the potential of DESs for lignin processing more closely. Jablonský et al found that the best fractionation of wheat straw (based on the selectivity of lignin removal) was a DES composed of ChCl with lactic acid (1 : 10) compared with choline chloride with urea (1 : 2), malonic acid (1 : 1), lactic acid (1 : 9; 1 : 10), malic acid (1 : 1).…”

“…Francisco et al. reported that DESs have high lignin solubility and very poor or negligible cellulose solubility, and the properties of DESs can be easily tuned by changing the HBDs and HBAs . Mechanism investigation revealed that the functional groups in the DESs significantly affected their ability to dissolve lignin, and they evaluated the potential of DESs for lignin processing more closely.…”

Novel and Efficient Lignin Fractionation Processes for Tailing Lignin-Based Materials

“…The lignin-rich solid fractions were obtained with distinct purities and yields by aqueous ionic liquid solution ([emim][HSO4]/H2O), and the IL was successful separation, recovery and reused [51]. cellulose solubility [61], and the properties of DESs can be easily tuned by changing the HBDs and HBAs [62]. Mechanism investigation revealed that the functional groups in the DESs significantly affected their ability to dissolve lignin [63], and it can evaluate the potential of DES for lignin processing more closely.…”

Comprehensive wheat straw processing with deep eutectic solvent to deliver reducing sugar and lignin streams

“…A key advantage of using DES is their lower sensitivity to water content, which eliminates the need for energy-intensive drying processes for wet biomass processing, providing economic bene ts over other chemical pretreatment methods [19,20]. Additionally, DES have been recently studied for their promising potential in the intensi cation of the biomass pretreatment process [21,22]. Due to the biocompatibility advantages of some DES, there is a possibility of skipping the biomass washing step between biomass pretreatment and enzymatic hydrolysis that is usually crucial when handling organic solvents as they can inhibit enzymes.…”