Support materials and solvents

Hambleton, Paul

doi:10.1007/978-94-011-0597-2_4

Cited by 1 publication

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“…(1) with x 1 and x 2 being the volume fractions and P 1 ′ and P 2 ′ being the polarity indices of the solvents (5.1, 4.3, and 10.2 for MeOH, EtOH, and water, respectively). 88,90 On the basis of this formula, Figure 4b was constructed and depicts the degree of delignification as a function of polarity P′. The amount of lignin extracted from the biomass follows a parabolic curve, with a maximum for P′ ≈ 8.…”

Section: ■ Results and Discussionmentioning

confidence: 64%

“…A quantitative method, earlier proposed by Snyder, to express relative solvent polarity is based on an experimentally determined polarity index P ′ . The polarity of a solvent mixture is given by the following formula with x 1 and x 2 being the volume fractions and P 1 ′ and P 2 ′ being the polarity indices of the solvents (5.1, 4.3, and 10.2 for MeOH, EtOH, and water, respectively). , On the basis of this formula, Figure b was constructed and depicts the degree of delignification as a function of polarity P ′.…”

Section: Resultsmentioning

confidence: 99%

“…A quantitative method, earlier proposed by Snyder, to express relative solvent polarity is based on an experimentally determined polarity index P′. 88 The polarity of a solvent mixture is given by the following formula 89…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Synergetic Effects of Alcohol/Water Mixing on the Catalytic Reductive Fractionation of Poplar Wood

Renders

Bosch

Vangeel

et al. 2016

ACS Sustainable Chem. Eng.

136

145

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One of the foremost challenges in lignocellulose conversion encompasses the integration of effective lignin valorization in current carbohydrate-oriented biorefinery schemes. Catalytic reductive fractionation (CRF) of lignocellulose offers a technology to simultaneously produce ligninderived platform chemicals and a carbohydrate-enriched pulp via the combined action of lignin solvolysis and metal-catalyzed hydrogenolysis. Herein, the solvent (composition) plays a crucial role. In this contribution, we study the influence of alcohol/water mixtures by processing poplar sawdust in varying MeOH/water and EtOH/water blends. The results show particular effects that strongly depend on the applied water concentration. Low water concentrations enhance the removal of lignin from the biomass, while the majority of the carbohydrates are left untouched (scenario A). Contrarily, high water concentrations favor the solubilization of both hemicellulose and lignin, resulting in a more pure cellulosic residue (scenario B). For both scenarios, an evaluation was made to determine the most optimal solvent composition, based on two earlier introduced empirical efficiency descriptors (denoted LFDE and LFFE). According to these measures, 30 (A) and 70 vol % water (B) showed to be the optimal balance for both MeOH/water and EtOH/water mixtures. This successful implementation of alcohol/water mixtures allows operation under milder processing conditions in comparison to pure alcohol solvents, which is advantageous from an industrial point of view.

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Section: ■ Results and Discussionmentioning

confidence: 64%