Use of Empty Fruit Bunches from the Oil Palm for bioethanol production: A thorough comparison between dilute acid and dilute alkali pretreatment

Chiesa, Simone; Gnansounou, Edgard

doi:10.1016/j.biortech.2014.02.122

Cited by 62 publications

(28 citation statements)

References 26 publications

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“…By contrast, dilute alkaline solution showed limited outcome, probably because of high lignin content (Chiesa and Gnansounou 2014).…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Delignification of Oil Palm Empty Fruit Bunch by Microwave-assisted Dilute Acid/Alkali Pretreatment

Akhtar¹,

Teo²,

Lai³

et al. 2014

BioResources

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Microwave-assisted dilute acid/alkali pretreatment is an efficient and rapid method of removing lignin and hemicellulose, however, the optimized parameters for the maximum efficiency have to date not been presented in the literature. The purpose of this study was to determine those conditions by examining the effects of three factors: microwave power, temperature, and time on delignification in microwave-assisted dilute acid/alkali pretreatment. For the control condition of conventional pretreatment (CP), empty fruit bunches (EFBs) were soaked in 2.5 M NaOH for two hours in the autoclave. In the experimental condition, EFB were first soaked in dilute sulfuric acid with conventional autoclave heating, which removed 90% of their hemicellulose. The acid-treated EFBs were then soaked in 2.5 M NaOH solution and microwaved at different conditions: microwave power (700 -100 watts), time (60 -90 min), and temperature (80 -110 °C). The amount of acid-insoluble lignin was determined by Klason method. Microwave-Alkali (Mw-A) pretreatment was modeled until it attained maximum delignification. More than twice the rate of delignification that is, 71.9% was attained with microwave-assisted alkali/acid pretreatment of 900 W microwave power at 110 °C for 80 min compared to 34.6% with conventional pretreatment.

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“…By contrast, dilute alkaline solution showed limited outcome, probably because of high lignin content (Chiesa and Gnansounou 2014).…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Delignification of Oil Palm Empty Fruit Bunch by Microwave-assisted Dilute Acid/Alkali Pretreatment

Akhtar¹,

Teo²,

Lai³

et al. 2014

BioResources

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“…Chiesa and Gnansounou (2014) reported an acetic acid concentration (1.53 g L -1 ) when the hydrolysis was carried out at 161.5°C, 9.44 min and 1.51% acid sulfuric concentration. However, the severity of this compound was not particularly evident.…”

Section: Opefb Dilute-acid Hydrolysismentioning

confidence: 99%

Xylose recovery from dilute-acid hydrolysis of oil palm (Elaeis guineensis) empty fruit bunches for xylitol production

Manjarrés-Pinzón¹,

Arias-Zabala²,

Londoño³

et al. 2017

Afr. J. Biotechnol.

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The aim of this study was to evaluate the effect of different process conditions, such as the sulfuric acid concentration, contact time, solid:liquid ratio and particle size, on the xylose recovery and the formation of by-products from oil palm empty fruit bunch (OPEFB) with dilute-acid hydrolysis. Moreover, an adapted and non-adapted strain of the yeast Candida guilliermondii was used to obtain xylitol from the optimal hydrolysate. Xylose, glucose, hydroxymethylfurfural (HMF) and acetic acid in the acid hydrolysate were analyzed with high performance liquid chromatography (HPLC). A BoxBehnken-based design was used to find the combination of factors that maximized the formation of xylose in the hydrolysate optimization process. The fermentation to obtain xylitol from the optimized hydrolysate of OPEFB with adapted and non-adapted C. guilliermondii strains was made in 100 ml Erlenmeyer flasks at 30°C for 96 h at 200 rpm in an incubator shaker. The maximum xylose concentration (32.59 g L -1) was obtained at 121°C, for 30 min, with a 1:8 solid:liquid ratio, 2% acid concentration and particle size of around 4 cm. With the same conditions, the inhibitor concentrations, such as HMF, glucose and acetic acid, were 0.023, 1.033 and 11.078 g L -1, respectively. The optimized conditions were the same as previously described. The higher xylitol productivity (10.3 g L -1) and yield (0.43 g g -1) were obtained by fermentation with non-adapted C. guilliermondii strains from the optimized hydrolysate of OPEFB without the need for detoxification. It is not necessary to make an adaptation of C. guilliermondii in the optimized hydrolysate of OPEFB to produce xylitol.

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“…More recently, Sudiyani et al (2013) have obtained promising results using an integrated process that included alkaline pretreatment at the pilot scale. Chiesa and Gnansounou (2014) compared dilute acid and dilute alkali pretreatment and showed that dilute alkali pretreatment performed poorly due to the significant lignin content of the OPEFB. Kristiani et al (2015) studied the effect of combining alkaline treatment with an irradiation pretreatment process using an electron beam machine.…”

Section: Introductionmentioning

confidence: 99%

Suitability assessment of a continuous process combining thermo-mechano-chemical and bio-catalytic action in a single pilot-scale twin-screw extruder for six different biomass sources

Vandenbossche

Brault

Hernández-Meléndez

et al. 2016

Bioresource Technology

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et al.. Suitability assessment of a continuous process combining thermo-mechano-chemical and biocatalytic action in a single pilot-scale twin-screw extruder for six different biomass sources. Bioresource Technology, Elsevier, 2016Elsevier, , vol. 211, pp. 146-153. <10.1016Elsevier, /j.biortech.2016 h i g h l i g h t sAdaptation of lignocellulosic biomass deconstruction process on pilot scale extruder. Combination of alkali pretreatment and biocatalytic action in extruder. Validated of the process on six different lignocellulosic biomasses. Keywords:Lignocellulosic biomass Twin-screw extruder Alkaline pre-treatment Enzymatic hydrolysis Bioextrusion a b s t r a c t A process has been validated for the deconstruction of lignocellulose on a pilot scale installation using six types of biomass selected for their sustainability, accessibility, worldwide availability, and differences of chemical composition and physical structure. The process combines thermo-mechano-chemical and bio-catalytic action in a single twin-screw extruder. Three treatment phases were sequentially performed: an alkaline pretreatment, a neutralization step coupled with an extraction-separation phase and a bioextrusion treatment. Alkaline pretreatment destructured the wall polymers after just a few minutes and allowed the initial extraction of 18-54% of the hemicelluloses and 9-41% of the lignin. The bioextrusion step induced the start of enzymatic hydrolysis and increased the proportion of soluble organic matter. Extension of saccharification for 24 h at high consistency (20%) and without the addition of new enzyme resulted in the production of 39-84% of the potential glucose.

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Use of Empty Fruit Bunches from the Oil Palm for bioethanol production: A thorough comparison between dilute acid and dilute alkali pretreatment

Cited by 62 publications

References 26 publications

Factors Affecting Delignification of Oil Palm Empty Fruit Bunch by Microwave-assisted Dilute Acid/Alkali Pretreatment

Factors Affecting Delignification of Oil Palm Empty Fruit Bunch by Microwave-assisted Dilute Acid/Alkali Pretreatment

Xylose recovery from dilute-acid hydrolysis of oil palm (Elaeis guineensis) empty fruit bunches for xylitol production

Suitability assessment of a continuous process combining thermo-mechano-chemical and bio-catalytic action in a single pilot-scale twin-screw extruder for six different biomass sources

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