Influence of alkaline catalyst addition on compressed liquid hot water pretreatment of rice straw

Imman, Saksit; Arnthong, Jantima; Burapatana, Vorakan; Champreda, Verawat; Laosiripojana, Navadol

doi:10.1016/j.cej.2014.12.032

Cited by 56 publications

(20 citation statements)

References 29 publications

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“…Recently, Imman et al. investigated the effect of alkaline‐catalyzed LHW treatment on rice straw . They found an increase in glucose recovery from enzymatic hydrolysis (maximum glucose yield of 71.8 %) when NaOH was added to LHW compared with LHW in the absence of NaOH.…”

Section: Pretreatment Of Lignocellulosic Biomassmentioning

confidence: 94%

Current Pretreatment Technologies for the Development of Cellulosic Ethanol and Biorefineries

et al. 2015

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Lignocellulosic materials, such as forest, agriculture, and agroindustrial residues, are among the most important resources for biorefineries to provide fuels, chemicals, and materials in such a way to substitute for, at least in part, the role of petrochemistry in modern society. Most of these sustainable biorefinery products can be produced from plant polysaccharides (glucans, hemicelluloses, starch, and pectic materials) and lignin. In this scenario, cellulosic ethanol has been considered for decades as one of the most promising alternatives to mitigate fossil fuel dependence and carbon dioxide accumulation in the atmosphere. However, a pretreatment method is required to overcome the physical and chemical barriers that exist in the lignin–carbohydrate composite and to render most, if not all, of the plant cell wall components easily available for conversion into valuable products, including the fuel ethanol. Hence, pretreatment is a key step for an economically viable biorefinery. Successful pretreatment method must lead to partial or total separation of the lignocellulosic components, increasing the accessibility of holocellulose to enzymatic hydrolysis with the least inhibitory compounds being released for subsequent steps of enzymatic hydrolysis and fermentation. Each pretreatment technology has a different specificity against both carbohydrates and lignin and may or may not be efficient for different types of biomasses. Furthermore, it is also desirable to develop pretreatment methods with chemicals that are greener and effluent streams that have a lower impact on the environment. This paper provides an overview of the most important pretreatment methods available, including those that are based on the use of green solvents (supercritical fluids and ionic liquids).

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Section: Pretreatment Of Lignocellulosic Biomassmentioning

confidence: 94%

Current Pretreatment Technologies for the Development of Cellulosic Ethanol and Biorefineries

et al. 2015

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“…LHW pretreatment of corn cobs at 160 • C for 10 min provided maximum hemicellulosederived sugar recovery of 58.8% and enzymatic hydrolysis yield of 73.1% with more than 60% lignin removal (Imman et al, 2018). Furthermore, Imman et al (2015) investigated the effect of the alkaline catalyst on LHW pretreatment of rice straw and demonstrated that rice straw pretreated with LHW in presence of NaOH showed remarkably higher glucose yield compared with LHW pretreatment in the absence of NaOH. Likewise, another study on the effects of acid and alkali promoters during LHW pretreatment of rice straw revealed that the presence of such promoters changes the physical structure of the pretreated biomass and thus lowered the required LHW temperature and improved the enzymatic digestibility (Imman et al, 2014).…”

Section: Liquid Hot Water (Lhw)mentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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Lignocellulosic biomass (LCB) is the most abundantly available bioresource amounting to about a global yield of up to 1. 3 billion tons per year. The hydrolysis of LCB results in the release of various reducing sugars which are highly valued in the production of biofuels such as bioethanol and biogas, various organic acids, phenols, and aldehydes. The majority of LCB is composed of biological polymers such as cellulose, hemicellulose, and lignin, which are strongly associated with each other by covalent and hydrogen bonds thus forming a highly recalcitrant structure. The presence of lignin renders the bio-polymeric structure highly resistant to solubilization thereby inhibiting the hydrolysis of cellulose and hemicellulose which presents a significant challenge for the isolation of the respective bio-polymeric components. This has led to extensive research in the development of various pretreatment techniques utilizing various physical, chemical, physicochemical, and biological approaches which are specifically tailored toward the source biomaterial and its application. The objective of this review is to discuss the various pretreatment strategies currently in use and provide an overview of their utilization for the isolation of high-value bio-polymeric components. The article further discusses the advantages and disadvantages of the various pretreatment methodologies as well as addresses the role of various key factors that are likely to have a significant impact on the pretreatment and digestibility of LCB.

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“…While thermal pathways such as pyrolysis and gasification convert biomass into pyrolysis oil [7] or synthesis gas [8], biomass pretreatment methods depolymerize biomass into their major constituents, which contain the building blocks for the production of a variety of chemicals. Most frequently used technologies are acid hydrolysis [9,10], steam explosion [11] and hot water pretreatment [12]. All pretreatment methods aim at the destruction of the lignocellulosic biomass matrix, which possesses a natural recalcitrance, ascribed to its structural composition.…”

Section: Introductionmentioning

confidence: 99%

Pretreatment and fractionation of lignocellulosic barley straw by mechanocatalysis

Schneider

Haverinen

Jaakkola

et al. 2017

Chemical Engineering Journal

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This study focuses on the mechanocatalytical process combining dilute acid pretreatment and mechanical processing driven by ball milling. Milled and hydrolyzed barley straw samples are subject to reducing sugar analysis by DNS assay and capillary electrophoresis. Optimization of the saccharification conditions was carried out with two different sulfuric acid concentrations, 0.5 mol kg -1 and 1.0 mol kg -1 , and compared. A significant yield of total reducing sugar (53.4 %) was obtained from barley straw impregnated with sulfuric acid (1.0 mol kg -1 ) after milling for only 20 min. Glucose and xylose concentrations accounted for 3.5 % and 11.3 %, respectively. Strikingly, the present study indicates a significant impact of the internal milling vessel temperature in the mechanocatalytical conversion process of barley straw in addition to the mechanical parameters and the catalyst concentration.

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Influence of alkaline catalyst addition on compressed liquid hot water pretreatment of rice straw

Cited by 56 publications

References 29 publications

Current Pretreatment Technologies for the Development of Cellulosic Ethanol and Biorefineries

Current Pretreatment Technologies for the Development of Cellulosic Ethanol and Biorefineries

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Pretreatment and fractionation of lignocellulosic barley straw by mechanocatalysis

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