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Improvement of ethanol production from mixed softwood by ionic liquid pretreatment
( Trinh Thi Phi Ly ),( Jae-won Lee ),( Hong-joo Lee ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Bioethanol is one of the promising alternative fuels that can be biolo gically produced from a variety of materials. Until now, most bioethanol has been produced from starch-containing feedstocks such as corn, sugarcane, rice, barley, and potato. Recently, there has been an increasing interest in the utilization of non-starch feedstocks such as lignocellulosic materials for the production of bioethanol. Lignocellulosic biomass is composed of cellulose, hemicellulose, and lignin, which are highly recalcitrant to chemicals or enzymes due to their complex arrangement and high degree of polymerization. Ionic liquids (ILs) have been reported as a promising solvent in the cellulose processing due to their interesting properties. In this work, pretreatment of mixed softwood with ionic liquids was examined for downstream saccharification and fermentation. The optimization of pretreatment conditions was considered to provide the cost-effectiveness process. The pretreated samples were hydrolyzed using a cocktail of enzymes, including cellulase, β-glucosidase, and xylanase. Ethanol fermentation was performed by the separate hydrolysis and fermentation. Ionic liquid pretreatment clearly modified the crystalline structure of softwood, facilitating the enzyme accessibility to biomass. Therefore, biomass digestibility significantly enhanced compared to that of untreated sample. Fermentation of hydrolysates resulted in high ethanol production that can be comparable to reported data. This result demonstrated the feasibility to improve bioethanol production of mixed softwood from ionic liquid pretreatment and subsequent bioconversion process.
Pervaporative separation of butanol using a composite PDMS/PEI hollow fiber membrane
Trinh, Ly Thi Phi,Lee, Young Ju,Bae, Hyeun-Jong,Lee, Hong-Joo Elsevier 2014 Journal of industrial and engineering chemistry Vol.20 No.5
<P><B>Abstract</B></P> <P>In the study, the separation and purification of butanol was carried out using the composite hollow fiber membrane having the active layer of polydimethylsiloxane (PDMS) on the macroporous support of polyetherimide (PEI). The pervaporation results with the initial butanol concentration showed a trade-off between flux and separation factor. However, both the flux and the separation factor increased as the operating temperature increased. The pervaporation results showed the butanol flux and the separation factor were higher than those of the reported results. In this study, butanol was concentrated by the pervaporation as a feasibility study for the biofuel applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Separation and purification of butanol was carried out as a feasibility study. </LI> <LI> Composite hollow fiber membrane having the active layer of PDMS/PEI was used. </LI> <LI> Pervaporation results showed higher than those of the reported results. </LI> <LI> Butanol was concentrated by the pervaporation for the biofuel applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>In the influence of the initial butanol concentration on the flux through the pervaporation membrane, the butanol flux increased linearly with the increasing initial butanol concentration at lower initial feed concentration than 2% butanol.</P>
Pervaporative separation of butanol using a composite PDMS/PEI hollow fiber membrane
Ly Thi Phi Trinh,Young Ju Lee,배현종,이홍주 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In the study, the separation and purification of butanol was carried out using the composite hollow fiber membrane having the active layer of polydimethylsiloxane (PDMS) on the macroporous support of polyetherimide (PEI). The pervaporation results with the initial butanol concentration showed a trade-off between flux and separation factor. However, both the flux and the separation factor increased as the operating temperature increased. The pervaporation results showed the butanol flux and the separation factor were higher than those of the reported results. In this study, butanol was concentrated by the pervaporation as a feasibility study for the biofuel applications. 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Pervaporative separation of bioethanol produced from the fermentation of waste newspaper
Ly Thi Phi Trinh,이홍주,조은진,배현종 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
In this study, a hydrophobic polymeric polydimethylsiloxane (PDMS) membrane was used for the pervaporative separation of bioethanol produced from fermentation of lignocellulosic biomass (waste newspaper) and glucose. As a preliminary study, the pervaporation permeation performance showed strong dependence on feed concentration and temperature. The pervaporation of bioethanol produced by the fermentation of waste newspaper by Saccharomyces cerevisiae decreased process performance. However, the process performance was restored reversibly by water cleaning. The pervaporative separation of bioethanol from the fermentation of waste newspaper was carried out without any significant decreasing process performance in the study.
Ly Thi Phi Trinh,이영주,박찬송,배현종 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Acidified [Bmim]Cl solution showed a great efficacy for the pretreatment of softwood, hardwood, rice straw, and sugarcane bagasse. The pretreatment resulted in 29 and 20-fold increase in cellulose digestibility of hardwood and softwood, respectively, and most cellulose in rice straw and sugarcane bagasse was converted into glucose. Fermentation of biomass hydrolysates produced 21.86–29.56 g/L ethanol, thereby achieving ethanol yields of 0.49–0.51 g/g. Ethanol was concentrated up to 79.8% from a fermentation broth containing 2.4% ethanol using four consecutive pervaporations. This work demonstrates the viability of biofuel production from diverse feedstocks and the feasibility of ethanol recovery using pervaporative separation.
√3 × 2 and √3 × √7 Charge Density Wave Driven by Lattice Distortion in Monolayer VSe2
Trinh Thi Ly,DUVJIR GANBAT,Nguyen Huu Lam,Jungdae Kim,Byoung Ki Choi,Young Jun Chang 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.5
A charge density wave (CDW), an ordered modulation of electron distribution and lattice distortion, is one of the intriguing phenomena observed in transition metal dichalcogenides. Recent STM studies reported a new CDW phase with √3 × 2 and √3 × √7 periodicities in monolayer (ML) VSe2 grown on graphene, which is totally different from the 4 × 4 × 3 CDW periodicity in bulk. Although the emergence of new CDW phase is of great research interest, the origin of the new modulation in ML VSe2 has not been clearly investigated. In this report, we conduct a systematic study to understand the nature of the √3 × 2 and √3 × √7 CDW in ML VSe2 using scanning tunneling microscopy (STM). Bias dependent topography and differential conductance (dI/dV) mapping indicate that the √3 × 2 and √3 × √7 modulations are mostly driven by strong lattice distortions of the Se atoms rather than by charge orderings. In addition, STM topography reveals that the √3 × 2 modulation corresponds to a gap feature, and the √3 × √7 modulation corresponds to an isolated Se atom in the distorted lattice structures. Our work provides prerequisite information to understand the emergence of √3 × 2 and √3 × √7 CDW in ML VSe2.
Ly Thi Phi Trinh,이영주,이재원,이원흥 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.2
We investigated the feasibility of producing bioethanol from mixed softwood pretreated with the ionic liquid 1-butyl-3-methylimidazolium acetate ([Bmim]Ac). The optimal pretreatment conditions were determined by response surface methodology to be 100°C for 15 h, and the fermentable sugar yield was estimated to be 92.5%. Efficient pretreatment of softwood was maintained even after reutilizing [Bmim]Ac up to four times. Through the enzymatic saccharification and subsequent fermentation, bioethanol was produced with 0.42 g/g of yield and 0.24 g/L/h of productivity, which clearly suggests that efficient and economical bioethanol production can be achieved by optimizing pretreatment processes and reutilizing ionic liquid.