Detailed material balance and ethanol yield calculations for the biomass-to-ethanol conversion process

Riley, Cynthia; Philippidis, George P.

doi:10.1007/bf02941725

Cited by 31 publications

(7 citation statements)

References 16 publications

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“…The fermentative efficiency (%) was calculated considering the ethanol yield of the assay (g alcohol produced g -1 reducing sugars consumed) in relation to the theoretical value of 0.511g alcohol g -1 sugars (HATZIS et al, 1996). In the energy cane juices, the determination of purity (%), Pol (%), Brix, total reducing sugars (g 100mL -1 ) and fiber (g 100g -1 ) were processed according to CONSECANA (2006).…”

Section: Methodsmentioning

confidence: 99%

Deterioration and fermentability of energy cane juice

et al. 2017

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The main interest in the energy cane is the bioenergy production from the bagasse. The juice obtained after the cane milling may constitute a feedstock for the first-generation ethanol units; however, little attention has been dedicated to this issue. In order to verify the feasibility of the energy cane juice as substrate for ethanol production, the objectives of this research were first to determine the microbiological characteristics and deterioration along the time of the juices from two clones of energy cane (Type I) and second, their fermentability as feedstock for utilization in ethanol distilleries. There was a clear differentiation in the bacterial and yeast development of the sugarcane juices assayed, being much faster in the energy canes than in sugarcane. The storage of juice for 8 hours at 30oC did not cause impact in alcoholic fermentation for any sample analyzed, although a significant bacterial growth was detected in this period. A decrease of approximately seven percentage points in the fermentative efficiency was observed for energy cane juice in relation to sugarcane in a 24-hour fermentation cycle with the baking yeast. Despite the faster deterioration, the present research demonstrated that the energy cane juice has potential to be used as feedstock in ethanol-producing industries. As far as we know, it is the first research to deal with the characteristics of deterioration and fermentability of energy cane juices.

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Section: Methodsmentioning

confidence: 99%

Deterioration and fermentability of energy cane juice

et al. 2017

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“…The percent theoretical (stoichiometric) ethanol yield (% Y EtOH ) was calculated according to Eq. (4): where 1.11 is the stoichiometric conversion factor of cellulose to equivalent glucose and 0.51 is the theoretical ethanol yield (in grams) generated per 1 g of glucose . This yield is always <100% as part of the sugars is converted to cell mass and by‐products by the organisms.…”

Section: Methodsmentioning

confidence: 99%

Comparing oxidative and dilute acid wet explosion pretreatment of Cocksfoot grass at high dry matter concentration for cellulosic ethanol production

Njoku

Uellendahl

Ahring

2013

Energy Science & Engineering

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The choice of a suitable pretreatment method and the adjustment of the pretreatment parameters for efficient conversion of biomass are crucial for a successful biorefinery concept. In this study, cocksfoot grass, a suitable lignocellulosic biomass with a potential for large-scale production was investigated for cellulosic ethanol production. The biomass raw materials were pretreated using wet explosion (WEx) at 25% dry matter concentration with addition of oxygen or dilute sulfuric acid. The enzymatic hydrolysis of cellulose was significantly improved after pretreatment. The highest conversion into cellulose monomeric C6 sugars was achieved for WEx condition AC-E (180°C, 15 min, and 0.2% sulfuric acid). For that condition, the highest ethanol yield of 197 g/kg DM (97% of theoretical maximum value) was achieved for SSF process by Saccharomyces cerevisiae. However, the highest concentration of hemicellulose C5 sugars was found for WEx pretreatment condition O2-A (160°C, 15 min, and 6 bar O 2 ) which means that the highest potential ethanol yield was found at this moderate pretreatment condition with oxygen added. Increasing the pretreatment temperature to 180-190°C with addition of oxygen or dilute sulfuric acid significantly degrades the solubilized hemicellulose sugars and thus, achieved the highest formation of by-products.

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“…Mass balance and yield calculations were determined by using the compositional analysis of raw and pretreated materials that are entered into a Microsoft Excel template that determines material balances on a mass and carbon-mole basis. (17). The template calculates the yield and mass balance for each component.…”

Section: Methodsmentioning

confidence: 99%

Efficacy of a Hot Washing Process for Pretreated Yellow Poplar to Enhance Bioethanol Production

Nagle

Elander

Newman

et al. 2002

Biotechnology Progress

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Cost reductions for pretreatment and bioconversion processes are key objectives necessary to the successful deployment of a bioethanol industry. These unit operations have long been recognized for their impact on the production cost of ethanol. One strategy to achieve this objective is to improve the pretreatment process to produce a pretreated substrate resulting in reduced bioconversion time, lower cellulase enzyme usage, and/or higher ethanol yields. Previous research produced a highly digestible pretreated yellow poplar substrate using a multistage, continuously flowing, very dilute sulfuric acid (0.07% (w/v)) pretreatment. This process reduced the time required for the bioconversion of pretreated yellow poplar sawdust to ethanol. This resulted in a substantially improved yield of ethanol from cellulose. However, the liquid volume requirements, steam demand, and complexity of the flow-through reactor configuration were determined to be serious barriers to commercialization of that process. A reconfigured process to achieve similar performance has been developed using a single-stage batch pretreatment followed by a separation of solids and liquids and washing of the solids at a temperatures between 130 and 150 degrees C. Separation and washing at the elevated temperature is believed to prevent a large fraction of the solubilized lignin and xylan from reprecipitating and/or reassociating with the pretreated solids. This washing of the solids at elevated temperature resulted in both higher recovered yields of soluble xylose sugars and a more digestible pretreated substrate for enzymatic hydrolysis. Key operating variables and process performance indicators included acid concentration, temperature, wash volume, wash temperature, soluble xylose recovery, and performance of the washed, pretreated solids in bioconversion via simultaneous saccharification and fermentation (SSF). Initial results indicated over a 50% increase in ethanol yield at 72 h for the hot washed material as compared to the control (no washing, no separation) and a 43% reduction of in the bioconversion time required for a high ethanol yield from cellulose

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Detailed material balance and ethanol yield calculations for the biomass-to-ethanol conversion process

Cited by 31 publications

References 16 publications

Deterioration and fermentability of energy cane juice

Deterioration and fermentability of energy cane juice

Comparing oxidative and dilute acid wet explosion pretreatment of Cocksfoot grass at high dry matter concentration for cellulosic ethanol production

Efficacy of a Hot Washing Process for Pretreated Yellow Poplar to Enhance Bioethanol Production

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