Pretreatment of waste biomass in deep eutectic solvents: Conductive heating versus microwave heating

Kumar, Narendra; Muley, Pranjali D.; Boldor, Dorin; Coty, Gary G.; Lynam, Joan G.

doi:10.1016/j.indcrop.2019.111865

Cited by 59 publications

(17 citation statements)

References 40 publications

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“…Additionally, there are some advantages of DESs for the following treatment, including low toxicity and biocompatibility. Moreover, the barely volatile components of DESs make them easy to recycle and reuse with no influence on the treatment efficiency [ 45 , 46 ]. DES pretreatment demonstrates specific selectivity to lignin, resulting in high-purity lignin extraction, which favours the fractionation and valorization of lignocellulose [ 46 ].…”

Section: Recent Advances In Lignocellulosic Biomass Treatment Processesmentioning

confidence: 99%

Recent advances in the valorization of plant biomass

Ning

Yang

et al. 2021

Biotechnol Biofuels

159

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Plant biomass is a highly abundant renewable resource that can be converted into several types of high-value-added products, including chemicals, biofuels and advanced materials. In the last few decades, an increasing number of biomass species and processing techniques have been developed to enhance the application of plant biomass followed by the industrial application of some of the products, during which varied technologies have been successfully developed. In this review, we summarize the different sources of plant biomass, the evolving technologies for treating it, and the various products derived from plant biomass. Moreover, the challenges inherent in the valorization of plant biomass used in high-value-added products are also discussed. Overall, with the increased use of plant biomass, the development of treatment technologies, and the solution of the challenges raised during plant biomass valorization, the value-added products derived from plant biomass will become greater in number and more valuable.

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Section: Recent Advances In Lignocellulosic Biomass Treatment Processesmentioning

confidence: 99%

Recent advances in the valorization of plant biomass

Ning

Yang

et al. 2021

Biotechnol Biofuels

159

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“…Mass yield for FA:CC was low because more of the solids were solubilized, leading to a higher mass of the precipitate from the filtrate. Heat required was 0.31 kW-h for the pretreatment process, which is relatively low as more energy can be produced with resultant glucose concentration [17].…”

Section: Mass Yield From Deep Eutectic Solvents (Des) Pretreatmentmentioning

confidence: 99%

Pretreatment of Loblolly Pine Tree Needles Using Deep Eutectic Solvents

Gujjula

Kumar

Lynam

2021

Biomass

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Deep eutectic solvents (DES) are new ‘green’ solvents that have a high potential for biomass processing because of their low cost, low toxicity, biodegradability, and easy recycling. When Loblolly pine trees are harvested, their branches with needles are typically left in brush piles and decompose very slowly. Exploring the effect of DES pretreatment on waste pine needles was the goal of the present work. Loblolly pine needles were treated with three types of DES to prepare the biomass for enzymatic hydrolysis to glucose, a subject not readily found in the literature. The resulting products were analyzed by Fourier transform infrared spectroscopy, fiber analysis, and high-performance liquid chromatography. Glucose yields after pretreatment and hydrolysis were found to be six times that for untreated biomass with two of the DES. Fiber analysis indicated removal of lignin, hemicellulose, and ash from the needle biomass. Enhanced glucose yield was due to removal of lignin and disruption of biomass structure during pretreatment, so that the pretreated biomass was rich in cellulosic content. Based on the results shown in this study, among the three types of DES, formic acid:choline chloride and acetic acid:choline chloride pretreatment had better potential for biomass pretreatment compared to lactic acid:choline chloride.

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“…The pretreatments were carried out using a biomass concentration of 9.1 wt% (3 g of dry biomass and 30 g of DES, for a 1:10 mass ratio) in a flask that was immersed in an oil bath with magnetic stirring. The pretreatment of biomass with the DES in Table 2 was conducted at 155 ˚C for 2 h. These conditions were chosen as optimal from previously performed studies in the literature [38,39]. The flask with the biomass and each DES was attached to a condenser to precipitate the slightly volatile DES [32], in order to keep the solvent volume constant.…”

Section: Pretreatment Of Biomass With Desmentioning

confidence: 99%

“…S1a and b that all the pretreated samples showed a FTIR vibration at 1425 cm −1 , indicating the pretreated biomass still contained considerable amount of crystalline cellulose. Details related to the vibrations associated with each biomass component are shown in Table S1 and explained by Kumar et al (2019) [39]. In the pretreated samples, the lignin and hemicellulose related characteristic vibrations are less prominent compared to the respective raw biomass.…”

Section: Ftir Analysismentioning

confidence: 99%

Secondary Agriculture Residues Pretreatment Using Deep Eutectic Solvents

Kumar

Gautam

Stallings

et al. 2020

Waste Biomass Valor

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The purpose of this work is to investigate a new class of solvents for separating secondary agricultural residues, which have already been transported to processing centers, into individual biomass components. Using biocompatible deep eutectic solvents (DES) on secondary agricultural residues could valorize these wastes into bioproducts by separating lignin from cellulose. DES pretreatment to achieve this separation involves chemicals that are less hazardous for the environment than other pretreatments. Methods Five deep eutectic solvents that are biocompatible have been investigated for their ability to deconstruct rice hulls and sugarcane bagasse. Mass yield, enzymatic hydrolysis of the pretreated biomass, fiber analysis, pKa analysis and Fourier transform infrared spectroscopy (FTIR) were performed to explore the effect of the DES on these secondary agricultural residues. Results Experimental results confirmed that the DES formic acid:choline chloride (FA:CC), lactic acid:choline chloride, and acetic acid:choline chloride were effective in removing lignin, thus concentrating cellulose in both pretreated biomass. Addition of water precipitated lignin from the spent DES, as confirmed by FTIR. However, the higher pKa DES lactic acid:betaine and lactic acid:proline had little effect on rice hulls or sugarcane bagasse. FA:CC was the most effective of the DES tested in preparing the biomass for enzymatic saccharification. All the effectively pretreated samples had higher inorganic content compared to the relevant raw biomass. Conclusions DES with stronger acidity (lower pKa) were found to be more efficient for delignification, leading to higher glucose yield. Further work is required to determine how inorganics affect waste biomass pretreatment.

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Pretreatment of waste biomass in deep eutectic solvents: Conductive heating versus microwave heating

Cited by 59 publications

References 40 publications

Recent advances in the valorization of plant biomass

Recent advances in the valorization of plant biomass

Pretreatment of Loblolly Pine Tree Needles Using Deep Eutectic Solvents

Secondary Agriculture Residues Pretreatment Using Deep Eutectic Solvents

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