Delignification Kinetics of Corn Stover with Aqueous Ammonia Soaking Pretreatment

Jin-nan, Gao; Xu, Yang; Wan, Junfeng; He, Yuyuan; Chang, Chun; Ma, Xinbin; Bai, Jing

doi:10.15376/biores.11.1.2403-2416

Cited by 10 publications

(11 citation statements)

References 21 publications

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“…In this study, 180 °C was considered a suitable pretreatment temperature. This finding is in agreement with previous research, which showed that temperature affected DS value [22].…”

Section: Figuresupporting

confidence: 94%

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Solihat

Sari

Risanto

et al. 2017

J. Math. Fund. Sci.

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Abstract. Developing an effective pretreatment for the conversion of lignocellulosic biomass to ethanol is an important effort in reducing the cost of this process. Microwave-assisted pretreatment is considered a green technology that can effectively break down lignocellulosic structures. The objective of this study was to investigate the most effective temperature for microwave-assisted oxalic acid pretreatment regarding the structural characteristic changes of oil palm empty fruit bunches (OPEFB) fibers. The fibers were subjected to microwave-assisted oxalic acid pretreatment at 160-200 °C with 2.5 minutes heating time and a liquid to solid ratio of 10. The effectiveness of the pretreatment was determined based on its delignification selectivity, morphological characteristics, and functional group changes. Microwave irradiation of OPEFB fibers at 180 ºC was effective in increasing the cellulose content by 24%. This pretreatment resulted in 1.82 delignification selectivity. More than 50% of the hemicellulose of the OPEFB was removed after this treatment, which was confirmed by a decrease of the absorption bands of functional groups at 1732 cm -1 . The increase of pretreatment temperature disrupted the morphological structure of the OPEFB and removed its hemicellulose but did not change its functional groups and lignin content.

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“…In this study, 180 °C was considered a suitable pretreatment temperature. This finding is in agreement with previous research, which showed that temperature affected DS value [22].…”

Section: Figuresupporting

confidence: 94%

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Solihat

Sari

Risanto

et al. 2017

J. Math. Fund. Sci.

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“…As seen for the same pretreatment time and temperature for 1 w/w % NaOH pretreatment, the concentration of lignin in solution increased with time and temperature for 3 w/w% NaOH pretreatment; this is supported by the results obtained by Wongwatanapaiboon et al [13], although, in their work, ammonia was used to pretreat Napier grass. Here, the highest quantity of lignin removed from the Napier grass sample was recorded at 120°C and after 90 mins Fig.…”

Section: Delignification Kinetics Of 3 W/w% Naohsupporting

confidence: 71%

“…In a recent study, the kinetics of lignin removal from corn Stover was carried out by soaking the biomass in different concentrations of aqueous ammonia aided by thermal treatment between 30 and 70°C [13]. Also, the pretreatment of corn Stover was conducted at temperatures of 170-230°C and 150-210°C using hot water and dilute acid to remove lignin from the substrate and it was discovered that pretreatment conditions from 200-230°C did not enhance lignin removal from the biomass [14].…”

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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“…The intended fraction of raw material (biomass with 7% moisture content was used in a quantity equal to circa 20 g of an absolutely dried material) was placed in a stainlesssteel reactor with the capacity of 250 mL, and either 15% or 20% (w/w) ammonia solution was added in order to apply a solid:liquid ratio of 1:12.5. The pretreatment conditions were based on previous research and selected for their preferable delignification ability (Gao et al 2016). The reactor was placed in oil bath that was pre-set and subsequently maintained at 50 °C or 90 °C for 20 h after the load inside the reactor reached the set temperature, and then it was cooled rapidly.…”

Section: Saa Pretreatmentmentioning

confidence: 99%

“…Additionally, aromatic acids or phenolic compounds, which also can have inhibitory effect on enzymes, may be formed as a result of lignin degradation during alkali pretreatment. The notable advantage of the SAA method is that ammonia used in the pretreatment may be recycled from the effluent and reused (Gao et al 2016). However, the long treatment time, high concentration of the base, and formation of residual salts in biomass are some of the flaws of alkali treatment (Verardi et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of soaking aqueous ammonia pretreatment on selected properties and enzymatic hydrolysis of poplar (Populus trichocarpa) wood

Akus-Szylberg

Antczak

Zawadzki

2021

BioRes

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Effects of soaking aqueous ammonia pretreatment were considered for fast-growing poplar wood in the context of bioethanol production. The milled Populus trichocarpa wood with a particle size of 0.43 to 1.02 mm was pretreated at two temperatures (50 °C and 90 °C) and two concentrations of ammonia solution (15% and 20% w/w) for 20 h. The lignin content decreased by 46% in the biomass treated with the most severe conditions. After enzymatic hydrolysis, the sugar yield was analysed, and the results indicated that increased temperature and ammonia concentration during pretreatment resulted in higher glucose content. Additionally, changes in the degree of polymerization and available pore volume were investigated.

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Delignification Kinetics of Corn Stover with Aqueous Ammonia Soaking Pretreatment

Cited by 10 publications

References 21 publications

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

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

Effects of soaking aqueous ammonia pretreatment on selected properties and enzymatic hydrolysis of poplar (Populus trichocarpa) wood

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