Significantly enhancing enzymatic hydrolysis of rice straw after pretreatment using renewable ionic liquid–water mixtures

Hou, Xue-Dan; Li, Ning; Zong, Min‐Hua

doi:10.1016/j.biortech.2013.02.118

Cited by 78 publications

(48 citation statements)

References 28 publications

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“…14 The development of biocompatible and bio-derived ILs (e.g., choline-based ILs) that are proven to be effective for biomass pretreatment makes one-pot biofuel production from lignocellulose possible. 15,16 We report here a one-pot HG production of ethanol using bio-derived ILs (bionic liquids). For the first time, an ethanol titer of over 40 g L -1…”

Section: Introductionmentioning

confidence: 99%

Transforming biomass conversion with ionic liquids: process intensification and the development of a high-gravity, one-pot process for the production of cellulosic ethanol

Sun

Konda

et al. 2016

Energy Environ. Sci.

206

189

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Producing concentrated sugars and minimizing water usage are key elements in the economics and environmental sustainability of advanced biofuels. Conventional pretreatment processes that require a water-wash step can result in losses of fermentable sugars and generate large volumes of wastewater or solid waste. To address these problems, we have developed high gravity biomass processing with a one-pot conversion technology that includes ionic liquid pretreatment, enzymatic saccharification, and yeast fermentation for the production of concentrated fermentable sugars and high-titer cellulosic ethanol. The use of dilute bio-derived ionic liquids (a.k.a. bionic liquids) enables one-pot, high-gravity bioethanol production due to their low toxicity to the hydrolytic enzyme mixtures and microbes used. We increased biomass digestibility at >30 wt% by understanding the relationship between ionic liquid and biomass loading, yielding 41.1 g L -1 of ethanol (equivalent to an overall yield of 74.8% on a glucose basis)using an integrated one-pot fed-batch system. Our technoeconomic analysis indicates that the optimized one-pot configuration provides significant economic and environmental benefits for cellulosic biorefineries by reducing the amount of ionic liquid required by ~90% and pretreatment-related water inputs and wastewater generation by ~85%. In turn, these improvements can reduce net electricity use, greenhouse gas-intensive chemical inputs for wastewater treatment, and waste generation. The result is an overall 40% reduction in the cost of cellulosic ethanol produced and a reduction in local burdens on water resources and waste management infrastructure.

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Section: Introductionmentioning

confidence: 99%

Transforming biomass conversion with ionic liquids: process intensification and the development of a high-gravity, one-pot process for the production of cellulosic ethanol

Sun

Konda

et al. 2016

Energy Environ. Sci.

206

189

View full text Add to dashboard Cite

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“…According to the previous work (Hou et al 2013), the acidity of ILs played an important role in enhancing the dissolution process, and Hammett acidity function (H0) could effectively represent the acidity strength of an acid in organic solvents. In this research, the H0 values (Fig.…”

Section: Effects Of Morpholine-based Ils On Dissolution Of Cellulose mentioning

confidence: 99%

Synthesis and Properties of Non-Aromatic Ionic Liquids and their Role in Cellulose Dissolution

Liu¹,

Chen²,

Ren³

et al. 2017

BioResources

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The dissolution of cellulose is an important pretreatment method required for some of its catalytic conversion processes. Morpholinium-based ionic liquids (ILs) are challenging solvent choices available for "greener" and "cheaper" dissolution of cellulose. In this study, morpholinium-based ILs were prepared, and their influencing factors were experimentally investigated. The unique bipolar chemical structure derived from oxygen (electron-rich center) and nitrogen (electron-poor center) considerably enhanced the Hammett acidity function (H0) of task-ILs. N-Methyl-N-allylmorpholinium acetate IL showed the highest H0 (2.324) and polarizability power (1.096). The anion of ILs determined the hydrogen bond basicity (β). The acetate anion contributed to β (0.88) values. As to fluid properties, the morpholinium-based ILs exhibited much lower viscosity. The properties of ILs improved the dissolution efficiency. The cellulose was directly dissolved in morpholinium-based Ils, and no other derivatives were formed. The cations and the anions of ILs studied reacted with oxygen and hydrogen atoms on the hydroxyl groups of cellulose, respectively.

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“…The ionic liquids, 1-butyl-3-methylimidazolium chloride (C 8 4 , purity ≥97%) was summarized in Figure 1. Ethanesulfonic acid, polymer Nafion ® NR50, (≥0.8 meq/g ion exchange capacity) was purchased from the Sigma-Aldrich Co. LLC.…”

Section: Materials and Chemicalsmentioning

confidence: 99%

“…The pretreatment processes were most effective in enhancement of cellulose digestibility [4]. The pretreated products were used as raw materials applications in saccharification chemistry [5] [6] and enzymatic hydrolysis [7] [8]. ILs solvents are able to catalyze homogenous hydrous is of cellulose by strong minerals or organic acids [9] [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Content on Crystalline Structure of Ionic Liquids Mixture Pretreated Microcrystalline Cellulose (MCC)

Wang¹,

Chen²,

Niida³

et al. 2014

MSA

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How to cite this paper: Wang, Q.Y., et al. (2014) AbstractMicrocrystalline cellulose (MCC) was pretreated by using ionic liquids (ILs)-water mixtures solvent with solid acid catalysts. Different amount of water was considerate as the main variable. The peak shift of pretreated sample was determined by FT-IR related to the water content. The XRD was applied to characterize the change in MCC crystalline structure. Thermal decomposition technique was applied to investigate the thermal stability of pretreated MCC. The result indicated that three state of samples were occurred in pretreated MCC sample which was related the amount of water in ILs mixture system. XRD result suggested that the raw sample was distorted and transformed into a less ordered intermediate structure and the smaller crystallite size in lump state sample was obtained which could lead to lower thermal stability. This study revealed the physical chemicals properties, characteristic of molecular structures in MCC using ILs-water mixtures.

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Significantly enhancing enzymatic hydrolysis of rice straw after pretreatment using renewable ionic liquid–water mixtures

Cited by 78 publications

References 28 publications

Transforming biomass conversion with ionic liquids: process intensification and the development of a high-gravity, one-pot process for the production of cellulosic ethanol

Transforming biomass conversion with ionic liquids: process intensification and the development of a high-gravity, one-pot process for the production of cellulosic ethanol

Synthesis and Properties of Non-Aromatic Ionic Liquids and their Role in Cellulose Dissolution

Effect of Water Content on Crystalline Structure of Ionic Liquids Mixture Pretreated Microcrystalline Cellulose (MCC)

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