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목질바이오매스 에너지 부산물(리그닌)이용에 관한 연구 동향
김영숙 강원대학교 산림과학연구소 2011 Journal of Forest Science Vol.27 No.3
This study reviewed on the research trend of sources and utilization of the byproducts(Lignin) from bioethanol production process with lignocellulosic biomass such as wood, agri-processing by-products(corn fiber, sugarcane bagasse etc.) and energy crops(switch grass, poplar, Miscanthus etc.). During biochemical conversion process, only Cellulose and hemicellulosic fractions are converted into fermentable sugar, but lignin which represents the third largest fraction of lignocellulosic biomass is not convertible into fermentable sugars. It is therefore extremely important to recover and convert biomass-derived Lignin into high-value products to maintain economic competitiveness of cellulosic ethanol processes. It was introduced that lignin types and characteristics were different from various isolation methods and biomass sources. Also utilization and potentiality for market of those were discussed.
Choi, June-Ho,Jang, Soo-Kyeong,Kim, Jong-Hwa,Park, Se-Yeong,Kim, Jong-Chan,Jeong, Hanseob,Kim, Ho-Yong,Choi, In-Gyu Elsevier 2019 Renewable energy Vol.130 No.-
<P><B>Abstract</B></P> <P>The main purpose of this study was simultaneous production of glucose, ethanol organosolv lignin (EOL), and furfural for total utilization of lignocellulosic biomass to improve economics of biorefinery. The glucose production (37.1 g, under conditions of 160 °C with 1% sulfuric acid) was significantly increased after organosolv pretreatment, dissolving 11.4 g of the initial hemicellulose-derived sugars and 22.6 g of the initial lignin. Progressively, organosolv lignin precipitation and furfural production processes were conducted using the liquid hydrolysates obtained after organosolv pretreatment. 12 g of EOL (at 160 °C, 1% sulfuric acid) was yielded with the remaining residues of soluble lignin-derived compounds in the liquid hydrolysates. Also, 7.9 g of furfural (at 160 °C, 1% sulfuric acid) was observed after additional acid-catalyzed treatment from the liquid hydrolysates. Consequently, a high yield of glucose, EOL and furfural can be obtained simultaneously using ethanol organosolv pretreatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ethanol organosolv pretreatment was conducted for total utilization of biomass. </LI> <LI> Biomass components were separated after ethanol organosolv pretreatment. </LI> <LI> 37.1 g of glucose was produced after enzymatic hydrolysis. </LI> <LI> 12.0 g of EOL and 7.9 g of furfural were obtained by additional process. </LI> <LI> This concept of process was proposed for the competitiveness of biorefinery. </LI> </UL> </P>
Ko, Ja Kyong,Jung, Je Hyeong,Altpeter, Fredy,Kannan, Baskaran,Kim, Ha Eun,Kim, Kyoung Heon,Alper, Hal S.,Um, Youngsoon,Lee, Sun-Mi Elsevier 2018 Bioresource technology Vol.256 No.-
<P><B>Abstract</B></P> <P>The recalcitrant structure of lignocellulosic biomass is a major barrier in efficient biomass-to-ethanol bioconversion processes. The combination of feedstock engineering via modification in the lignin synthesis pathway of sugarcane and co-fermentation of xylose and glucose with a recombinant xylose utilizing yeast strain produced 148% more ethanol compared to that of the wild type biomass and control strain. The lignin reduced biomass led to a substantially increased release of fermentable sugars (glucose and xylose). The engineered yeast strain efficiently co-utilized glucose and xylose for fermentation, elevating ethanol yields. In this study, it was experimentally demonstrated that the combined efforts of engineering both feedstock and microorganisms largely enhances the bioconversion of lignocellulosic feedstock to bioethanol. This strategy will significantly improve the economic feasibility of lignocellulosic biofuels production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The use of lignin-modified biomass with engineered yeast improved ethanol production. </LI> <LI> Ethanol yields were elevated by 148%. </LI> <LI> This strategy maximizes the overall efficiency for lignocellulosic biofuel production. </LI> </UL> </P>
Cho, Dong-Wan,Tsang, Daniel C.W.,Kim, Sohyun,Kwon, Eilhann E.,Kwon, Gihoon,Song, Hocheol Elsevier 2018 Bioresource technology Vol.270 No.-
<P><B>Abstract</B></P> <P>Thermochemical conversion of cobalt (Co)-loaded lignin-rich spent coffee grounds (COSCG) was carried out to find the appropriate pyrolytic conditions (atmospheric gas and pyrolytic time) for syngas production (H<SUB>2</SUB> and CO) and fabricate Co-biochar catalyst (CBC) in one step. The use of CO<SUB>2</SUB> as atmospheric gas and 110-min pyrolytic time was optimal for generation of H<SUB>2</SUB> (∼1.6 mol% in non-isothermal pyrolysis for 50 min) and CO (∼4.7 mol% in isothermal pyrolysis for 60 min) during thermochemical process of COSCG. The physicochemical properties of CBC fabricated using optimized pyrolytic conditions for syngas production were scrutinized using various analytical instruments (FE-SEM, TEM, XRD, and XPS). The characterizations exhibited that the catalyst consisted of metallic Co and surface wrinkled carbon layers. As a case study, the catalytic capability of CBC was tested by reducing <I>p</I>-nitrophenol (PNP), and the reaction kinetics of PNP in the presence of CBC was measured from 0.04 to 0.12 s<SUP>−1</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermochemical conversion of Co-loaded waste coffee grounds in N<SUB>2</SUB> and CO<SUB>2</SUB>. </LI> <LI> Enhanced production of syngas by impregnating Co and using CO<SUB>2</SUB> atmosphere. </LI> <LI> Termination of CO generation at 60 min in isothermal pyrolysis stage (700 °C). </LI> <LI> Fabrication of Co-doped biochar under optimal conditions for syngas production. </LI> <LI> Demonstrated catalytic capability of Co-doped biochar. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>