Modelling and optimization of xylose and glucose production from napier grass using hybrid pre-treatment techniques

Mafuleka, Siphelele; Kana, E.B. Gueguim

doi:10.1016/j.biombioe.2015.03.031

Cited by 26 publications

(12 citation statements)

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“…The HNO 3 -based model gave maximum xylose and glucose yields of 49.06 and 15.95 g/L respectively when pre-treatment heating time was increased to 240 min. This is in line with the studies by Mafuleka and Kana [14] who reported a similar pattern of sugar release as a function of pretreatment time.…”

Section: Linear Effect Of Input Variables On Monomeric Sugar Releasesupporting

confidence: 90%

“…Furthermore, the interaction of these input parameters on glucose release showed that at high set-point values (>above 18 h) of acid exposure lag time and 155 min heating time, higher yields were obtained. Similar observations on the improvement of sugar recovery at high acid concentration and process time have been reported by Mafuleka and Kana [14]. However, given the cost of these operational variables, a suitable techno-economic analysis is required to determine the most suitable operational set-points.…”

Section: Interactive Effect Of Pre-treatment Variables On Sugar Releasesupporting

confidence: 57%

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Biohydrogen process development on waste sorghum (Sorghum bicolor) leaves: Optimization of saccharification, hydrogen production and preliminary scale up

Rorke

Kana

2016

International Journal of Hydrogen Energy

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Section: Linear Effect Of Input Variables On Monomeric Sugar Releasesupporting

confidence: 90%

Section: Interactive Effect Of Pre-treatment Variables On Sugar Releasesupporting

confidence: 57%

Biohydrogen process development on waste sorghum (Sorghum bicolor) leaves: Optimization of saccharification, hydrogen production and preliminary scale up

Rorke

Kana

2016

International Journal of Hydrogen Energy

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“…Napier grass biomass has also been subjected to hot water pretreatment at 100°C for a period of 25 minutes in a batch autoclave reactor . The use of acid or alkali, combined with heat or microwave, has also been proposed for the pretreatment of Napier grass . Biological pretreatment is another method that uses lignin‐degrading fungi to decompose lignin and breakdown the recalcitrant linkage between lignin and hemicellulose.…”

Section: Introductionmentioning

confidence: 99%

“…10 The use of acid or alkali, combined with heat or microwave, has also been proposed for the pretreatment of Napier grass. 11 Biological pretreatment is another method that uses lignin-degrading fungi to decompose lignin and breakdown the recalcitrant linkage between lignin and hemicellulose. After microbial pretreatment, cellulose is thus more exposed to hydrolysis and the saccharide yield from Napier grass can be enhanced.…”

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confidence: 99%

Evaluation of different pretreatments of Napier grass for enzymatic saccharification and ethanol production

Tsai

Lee

Kuan

et al. 2018

Energy Science & Engineering

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Due to its fast‐growing and high carbohydrate content, Napier grass has a great potential to be chosen as a raw material for renewable energy production. The Napier grass after different pretreatments was tested for simultaneous saccharification and fermentation (SSF) with dried yeast (Saccharomyces cerevisiae) and cellulase (CTec2) to produce ethanol. For alkaline pretreatment, the grass was incubated with 10% NaOH at a ratio of 1:20 (w/v) at 90°C for 1 hour. For dilute acid pretreatment, the grass was soaked with 1% H2SO4 at a ratio of 1:10 (w/v) and incubated at 120°C for 1 hour. For the two‐stage pretreatment, the resultant solid from dilute acid pretreatment was further treated with 2% NaOH (1:10 w/v) at 80°C for 6 hours. After enzymatic saccharification at 50°C and pH 5.0 for 96 hours using CTec2, yields of glucose from three pretreated Napier grass samples (10% water‐insoluble solids, WIS) were 75.4 ± 2.9%, 55.4 ± 6.5%, and 76.4 ± 5.0%. Using 10% WIS of alkaline‐pretreated Napier grass biomass as the substrate, the 72‐hour SSF led to an ethanol yield of 86.6 ± 3.4%. On the basis of the dried biomass of Napier grass as the raw material, the ethanol yield could reach 0.143 ± 0.006 (g/g). Napier grass biomass could be effectively treated by alkaline, dilute acid, or two‐stage pretreatment methods to remove non‐cellulosic components to some extent. Alkaline pretreatment was found to be superior to dilute acid and two‐stage pretreatment methods, based on ethanol yields obtained under similar SSF conditions.

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“…The physicochemical changes occurring in lignocellulosic biomasses during pretreatment can be determined experimentally, which will aid the development of models for accurate design of pretreatment processes [20]. Modelling and optimization of Napier grass pretreatment using four combined pretreatment techniques for glucose and xylose production was carried out [21], where they reported lower sugar yield from NaOH and moist heat, and NaOH and microwave hybridized pretreatment methods as compared to the HCl-hybridized forms of pretreatments; two reasons may have been responsible for the lower sugar yield and these include, the interference of thermal radiation with the action of NaOH in the sample and the selectivity of the lignin matrix for NaOH. Lignin binds to sites within a biomass/substrate especially at areas where it is least desired for industrial applications [22 -27].…”

Section: Introductionmentioning

confidence: 99%

Chemical Kinetics of Alkaline Pretreatment of Napier Grass (Pennisetum purpureum) Prior Enzymatic Hydrolysis

Sanni¹,

Akinrinola²,

Yusuf³

et al. 2018

TOCENGJ

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Background:Napier grass is a naturally abundant waste material that can be cultivated over a vast area of land which makes it a viable source for sugar and bioethanol production.Introduction:The presence of lignin in the biomass makes cellulose inaccessible for conversion to useful products, however, in order to provide for efficient utilization of the waste material, reagent and energy, a study on the kinetics of lignin removal from Napier grass was carried out in this work using 1 and 3 w/w % NaOH at temperatures between 80 and 120°C.Materials & Methods:Based on the investigation, there was increased lignin removal for increased NaOH concentration. Kinetic parameters were also determined and it was observed that, the reaction of lignin in Napier grass with NaOH obeys a pseudo-zero or pseudo-fractional order kinetics. Furthermore, the orders of the reaction for the pretreatment conditions of 3 w/w% NaOH at 100°C and those of 3 and 1 w/w NaOH at 120°C gave close reaction orders of 0.2, 0.22 and 0.24 respectively after 110 minutes, which implies that, for the three cases, the residual lignin in the extract was almost the same at the pretreatment conditions while slight differences are evident in their pseudo rate constants. Also, it was observed that, the activation energy of the reaction reduced significantly as the concentration of NaOH increased from 1w/w - 3 w/w%.Conclusion:Based on the AIL and the total lignin (i.e.AIL + ASL) in the Napier grass, the recorded delignification efficiencies at the optimum pretreatment time of 17.5 h are 90 and 76% respectively. In addition, the adopted Differential Technique (DT) combined with the Ostwald Method of Isolation (OMI) can be accurately used to study the kinetics of lignin removal from Napier grass.

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Modelling and optimization of xylose and glucose production from napier grass using hybrid pre-treatment techniques

Cited by 26 publications

References 26 publications

Biohydrogen process development on waste sorghum (Sorghum bicolor) leaves: Optimization of saccharification, hydrogen production and preliminary scale up

Biohydrogen process development on waste sorghum (Sorghum bicolor) leaves: Optimization of saccharification, hydrogen production and preliminary scale up

Evaluation of different pretreatments of Napier grass for enzymatic saccharification and ethanol production

Chemical Kinetics of Alkaline Pretreatment of Napier Grass (Pennisetum purpureum) Prior Enzymatic Hydrolysis

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