Enhanced bioethanol production from yellow poplar by deacetylation and oxalic acid pretreatment without detoxification

Kundu, Chandan; Lee, Hong-Joo; Lee, Jae Won

doi:10.1016/j.biortech.2014.08.082

Cited by 39 publications

(14 citation statements)

References 29 publications

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“…The utility of CHF is that it can provide reasonably good predictions of sugar yield during subsequent enzymatic hydrolysis Zhang et al, 2015). This is because xylan dissolution that can be accurately predicted by CHF, dictates substrate enzymatic saccharification for lignocelluloses with low lignin content such as hardwoods and herbaceous biomass (Yang and Wyman, 2004;Moxley et al, 2012;Zhu et al, 2012;Leu and Zhu, 2013;Zhang et al, 2013). In our previous laboratory study using the same NE222 wood chips (Zhang et al, 2015), we demonstrated that optimal sugar yield can be obtained when achieving complete dissolution of fast xylan, i.e., X R = θ, corresponding to CHF = 3.1.…”

Section: Frontiers In Energy Research | Bioenergy and Biofuelsmentioning

confidence: 99%

High Titer Ethanol and Lignosulfonate Production from SPORL Pretreated Poplar at Pilot Scale

et al. 2015

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Poplar NE222 (Populus deltoides Bartr. ex Marsh × P. nigra L.) wood chips were pretreated in a 390 L pilot-scale rotating wood-pulping digester using a dilute sulfite solution of approximately pH 1.8 at 160°C for 40 min for bioconversion to ethanol and lignosulfonate (LS). An estimated combined hydrolysis factor (CHF) of 3.3 was used to scale the sulfite pretreatment temperature and time from laboratory bench scale experiments, which balanced sugar yield and inhibitor formation to facilitate high titer ethanol production through fermentation using S. cerevisiae YRH400 without detoxification. A terminal ethanol titer of 43.6 g L -1 with a yield of 247 L tonne wood -1 was achieved at total solids loading of 20%. The relatively low ethanol yield compared with yield from Sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL)-pretreated softwoods was due to inefficient utilization of xylose. The LS from SPORL has a substantially higher phenolic group (Ph-OH) content, though it was less sulfonated and had a lower molecular weight than a purified commercial softwood LS, and therefore has potential for certain commercial markets and future novel applications through further processing. The conversion efficiency achieved through process integration and simplification, demonstrated here, has significant importance to the entire supply chain of biofuel production from woody biomass.

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Section: Frontiers In Energy Research | Bioenergy and Biofuelsmentioning

confidence: 99%

High Titer Ethanol and Lignosulfonate Production from SPORL Pretreated Poplar at Pilot Scale

et al. 2015

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“…따라서 전처리를 수행하기 전에 수산화나트륨 (NaOH)을 이용하여 아세틸기를 제거할 필요가 있다 [6]. 뿐만 아니라 산 촉매 전처리에 의해 alphatic acids (acetic acid, formic acid, levulinic acid), furan aldehydes (furfural, 5-hydroxymethylfurfural), aromatic compounds (phenolics) 등의 부산물이 생산되며 액상 가수분해산물을 이용하여 발효를 수행할 경우 이와 같은 발효저해물질을 제거해야 한 다.…”

Section: 아세트산(Acetic Acid)이 발효저해물질로 생산된다 활엽수 헤미셀룰 로오스의 대부분은 글루쿠로노자이란unclassified

Improved Ethanol Production from Deacetylated Yellow Poplar (Liriodendron tulipifera) by Detoxification of Hydrolysate and Semi-SSF

Kim¹,

Lee

2016

Korean Chemical Engineering Research

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− In order to remove acetyl group from yellow poplar, deacetylation was performed using sodium hydroxide (NaOH) prior to oxalic acid pretreatment. During the deacetylation (60 o C for 80 min, 0.8% NaOH), most of the acetyl group were removed from hemicellulose. Simultaneous saccharification and fermentation (SSF) and semi-SSF were carried out based on solid loading (10, 12.5, 15%) of deacetylated biomass and pre-hydrolysis with enzymes (0, 6, 12, 24 h). The highest ethanol was obtained as 26.73 g/L after 120 h when 10% of biomass was used for SSF. It is corresponding to 88.41% of theoretical ethanol yield. At the 12.5% and 15% of biomass loading, the highest ethanol was obtained from 6 h pre-hydrolysis. It was 32.34 g/L and 27.15 g/L, respectively, and corresponding to ethanol yield of 85.58 and 59.87%. In order to remove fermentation inhibitors from hydrolysates, overliming was performed using calcium hydroxide (Ca(OH) 2 ). The highest ethanol was 5.28 g/L after 72 h of fermentation.

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“…To solve this problem, the deacetylation process at low severe condition prior to dilute acid fractionation could show not only significant improvement on sugars yields, but also toxicity reduction in hydrolyzate, thereby enhancing bioethanol production [20]. Therefore, several researchers have tried to remove the acetyl group with sodium hydroxide before fractionation to reduce the toxicity in hemicellulosic hydrolyzate [7,10,21,22].…”

Section: Introductionmentioning

confidence: 99%

Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation

Kim

2018

Energies

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Abstract:In order to produce bioethanol from yellow poplar sawdust without detoxification, deacetylation (mild alkali treatment) was performed with aqueous ammonia solution. To select the optimal conditions, deacetylation was carried out under different conditions: NH 4 OH loading (2-10% (w/v)) and a solid-to-liquid ratio of 1:4-1:10 at 121 • C for 60 min. In order to assess the effectiveness of deacetylation, fractionation of deacetylated yellow poplar sawdust was performed using dilute acid (H 2 SO 4 , 0.5-2.0% (w/v)) at a reaction temperature of 130-150 • C for 10-80 min. The toxicity-reduced hemicellulosic hydrolyzates that were obtained through a two-step treatment at optimized conditions were fermented using Pichia stipitis for ethanol production, without any further detoxification. The maximum ethanol production was 4.84 g/L, corresponding to a theoretical ethanol yield of 82.52%, which is comparable to those of intentionally made hydrolyzates as controls.

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Enhanced bioethanol production from yellow poplar by deacetylation and oxalic acid pretreatment without detoxification

Cited by 39 publications

References 29 publications

High Titer Ethanol and Lignosulfonate Production from SPORL Pretreated Poplar at Pilot Scale

High Titer Ethanol and Lignosulfonate Production from SPORL Pretreated Poplar at Pilot Scale

Improved Ethanol Production from Deacetylated Yellow Poplar (Liriodendron tulipifera) by Detoxification of Hydrolysate and Semi-SSF

Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation

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