Chemical Recovery of γ-Valerolactone/Water Biorefinery

Lê, Huy; Pokki, Juha Pekka; Borrega, Marc; Uusi–Kyyny, Petri; Alopaeus, Ville; Sixta, Herbert

doi:10.1021/acs.iecr.8b03723

Cited by 37 publications

(20 citation statements)

References 36 publications

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“…The liquid fraction could be further processed for the recovery of lignin, hemicellulose derived sugars, and GVL. The GVL can be employed in a new OV cycle, thus decreasing the whole process' environmental pollution impact [15].…”

Section: Introductionmentioning

confidence: 99%

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

et al. 2020

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Lignocellulosic biomass is a non-edible feedstock that can be used in integrated biorefinery for the production of biochemicals and biofuel. Among lignocellulosic biomass, Cynara cardunculus L. (cardoon) is a promising crop thanks to its low water and fertilizer demand. Organosolv is a chemical treatment that uses numerous organic or aqueous solvent mixtures, and a small amount of acid catalyst, in order to solubilize the lignin and hemicellulose fractions, making the cellulose accessible to hydrolytic enzymes. Lignocellulosic residues of cardoon underwent a two-step treatment process to obtain fermentable glucose. In the first step, the milled biomass was subjected to microwave-assisted extraction using an acidified γ-valerolactone (GVL)/water mixture, yielding a solid cellulose pulp. In the second step, the pre-treated material was hydrolyzed by cellulolytic enzymes to glucose. The first step was optimized by means of a two-level full factorial design. The investigated factors were process temperature, acid catalyst concentration, and GVL/water ratio. A glucose production equal to 30.17 g per 100 g of raw material (89% of the maximum theoretical yield) was achieved after conducting the first step at 150 °C using an acidified water solution (1.96% H2SO4w/w).

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Section: Introductionmentioning

confidence: 99%

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

et al. 2020

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“…Recovery of the solvent is of high importance to enable a cost-efficient process, where make-up chemicals should be kept at a minimum. Lê et al [108] processed Eucalyptus globulus wood chips using GVL/water fractionation with different liquid-to-solids ratios ranging from 2 L kg −1 to 10 L kg −1 at a reaction temperature of 180 °C and a residence time of 150 min. The GVL content in the liquor was 50%.…”

Section: Pretreatment Methodsmentioning

confidence: 99%

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Galbe

Wallberg

2019

Biotechnol Biofuels

357

195

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The implementation of biorefineries based on lignocellulosic materials as an alternative to fossil-based refineries calls for efficient methods for fractionation and recovery of the products. The focus for the biorefinery concept for utilisation of biomass has shifted, from design of more or less energy-driven biorefineries, to much more versatile facilities where chemicals and energy carriers can be produced. The sugar-based biorefinery platform requires pretreatment of lignocellulosic materials, which can be very recalcitrant, to improve further processing through enzymatic hydrolysis, and for other downstream unit operations. This review summarises the development in the field of pretreatment (and to some extent, of fractionation) of various lignocellulosic materials. The number of publications indicates that biomass pretreatment plays a very important role for the biorefinery concept to be realised in full scale. The traditional pretreatment methods, for example, steam pretreatment (explosion), organosolv and hydrothermal treatment are covered in the review. In addition, the rapidly increasing interest for chemical treatment employing ionic liquids and deep-eutectic solvents are discussed and reviewed. It can be concluded that the huge variation of lignocellulosic materials makes it difficult to find a general process design for a biorefinery. Therefore, it is difficult to define "the best pretreatment" method. In the end, this depends on the proposed application, and any recommendation of a suitable pretreatment method must be based on a thorough techno-economic evaluation.

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“…Other well-established methods are MILOX (formic acidperoxyformic acid) and Clean Fractionation (methyl isobutyl ketone-ethanol-water). An insu cient pulp quality, low recovery rates, and a corrosive character of the solvent prevent these techniques to enter the level of full-scale operation (Lê et al 2018b). On the other side, Chempolis has successfully commercialized Formico™, a technology for the production of ethanol, biochemicals, and green power from the cellulosic biomass fractionated in formic acid (Anttila 2019).…”

Section: Introductionmentioning

confidence: 99%

Stability of Gamma-valerolactone Under Pulping Conditions as a Basis for Process Optimization and Chemical Recovery

Granatier

Schlapp‐Hackl

Lê

et al. 2021

Preprint

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This study investigates the extent of the g-valerolactone (GVL) hydrolysis forming an equilibrium with 4-hydroxyvaleric acid (4-HVA) in aqueous solutions over a wide pH range. The hydrolysis of pure 50 wt% GVL to 4-HVA (3.5 mol%) was observed only at elevated temperatures. The addition of sulfuric acid (0.2×10-5 wt% to 6 wt%) at elevated temperatures (150 – 180°C) and reaction times between 30-180 min caused the formation of 4 mol% 4-HVA but with decreasing acidity, the 4-HVA remained constant at about 3 mol%. The hydrolysis reactions in alkaline conditions were conducted at constant time (30 min) and temperature (180 °C) with variation of the NaOH concentration (0.2×10-6 wt% to 7 wt%). The addition of less than 0.2 wt % of NaOH resulted in the formation of less than 4 mol% of sodium 4-hydroxyvalerate. A maximum amount of 21 mol% of 4-HVA was observed in a 7 wt% NaOH solution. The stability after synthesis was determined by NMR analysis. To verify the GVL stability results obtained under practical conditions, Betula pendula sawdust was fractionated in 50% GVL with and without addition of H2SO4 or NaOH at 180°C and 120 min, and spent liquor was analyzed. The spent liquor contained 5.6 mol% and 6.0 mol% of 4-HVA in a highly acidic (20 kg H2SO4/t wood) and alkaline (192 kg NaOH/ t wood) environment, respectively.

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Chemical Recovery of γ-Valerolactone/Water Biorefinery

Cited by 37 publications

References 36 publications

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

Pretreatment for biorefineries: a review of common methods for efficient utilisation of lignocellulosic materials

Stability of Gamma-valerolactone Under Pulping Conditions as a Basis for Process Optimization and Chemical Recovery

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