Dilute acid hydrolysis of lignocellulosics: An application to medium consistency suspensions of hardwoods using a plug flow reactor

Abatzoglou, Nicolas; Koeberle, P. G.; Chornet, E.; Overend, R. P.; Koukios, Emmanuel G.

doi:10.1002/cjce.5450680414

Cited by 44 publications

(22 citation statements)

References 11 publications

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“…The coefficient a represents the ratio of the molecular weight of the polymer per unit sugar to the molecular weight of the monomer. For example, the molecular weight of hemicelluloses per unit xylose is 132 kg kmol À1 and that of xylose is 150 kg kmol À1 , thereby giving a value of a ¼ 0.88 [19,21]. Similarly, a ¼ 0.9 (i.e.…”

Section: Kinetics Of Acid Hydrolysismentioning

confidence: 96%

Kinetic studies of two-stage sulphuric acid hydrolysis of sugarcane bagasse

et al. 2015

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a b s t r a c tThe present paper reports the two-stage hydrolysis of sugarcane bagasse to produce monomer sugars by using dilute and concentrated sulphuric acid. About 88% of the sugars present in bagasse could be recovered with a little formation of toxic compounds such as furfural/HMF. The sugar concentration in the first-stage of hydrolysis was obtained as xylose-rich solution of 49.7 g l À1 using 8% acid concentration at 100 C and a solid to liquid ratio of 1:4, whereas, with the same solid to liquid ratio of 1:4, 73.4 g l À1 glucose-rich solution was obtained in the second-stage of hydrolysis by using 40% acid concentration at 80 C. The acid hydrolysis of bagasse could be described by a first-order, two-step consecutive reaction model, where the polysaccharides first decompose into monomers through hydrolysis, and thereafter, decompose into various products in the second step. The proposed kinetic model correlates the experimental data satisfactorily.

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Section: Kinetics Of Acid Hydrolysismentioning

confidence: 96%

Kinetic studies of two-stage sulphuric acid hydrolysis of sugarcane bagasse

et al. 2015

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“…Pyranosidic ring structures will be dehydrated into hydroxymethylfurfural and furanosidic ring structures in furfural (Bobleter and Binder, 1980). According to Abatzoglou et al (1990), hemicellulose are easy to hydrolysed at high temperatures between 200 to 230°C even without the presence of an acid catalyst because of its structure and characteristics for example non-crystalline, highly disordered and heteropolymers (Ishii and Shimizu, 2001). Boonstra and Tjeerdsma (2005), stated that the heat treatment at 180°C are less effective to depolymerise of hemicellulose however depolymerisation increased after temperature was raised to 185°C consequent degraded of hemicellulose content.…”

Section: Hemicellulose Contentmentioning

confidence: 99%

Effect of Oil Heat Treatment on Chemical Constituents of Semantan Bamboo (Gigantochloa scortechinii Gamble)

Salim

Wahab

Ashaari³

2009

JSD

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Effect of oil heat treatment on chemical constituents of 3 years old Gigantochloa scortechinii Gamble bamboo was investigated. The bamboo splits within epidermis were heat-treated using crude palm oil at temperature 140°C, 180°C and 220°C for duration 30 and 60 min. After removed the epidermis, the samples were then grind to pass a BS 40-mesh sieve and retained on a BS 60-mesh sieve. The sawdust was air dried for several days before conducted to chemical analyses (cellulose, hemicellulose and lignin) based on TAPPI Standard Methods. The colorimetric method devised by Humprey and Kelly (1960) was adapted to analysis starch in bamboo. Reading was obtained through Baush Lomb UV Spectrophotometer at 650 µm calculated by standard reference using A.R. potato starch. Control was used as comparison for each type of test conducted. There was no significant different between control and condition at 140°C for 60 min (81.4%) of holocellulose content. The value was decreased by 2.1 to 10.7% (79.7 to 72.7%) after heating at 180 to 220°C for 30 to 60 min. The hemicellulose content of bamboo was ranged 24.1 to 27.8% after heating at 140-220°C for 30 to 60 min. The cellulose content of heat-treated bamboo was ranged 47.4 to 55.2% after reduced about 2 to 14%. Lignin content increased about 16% (26%) at 220°C/60 min after reduced approximately 1 to 5% at 140 to 180°C for 30 to 60 min. Starch content was largely reduced about 2 to 54% (4 to 1.9%) at 140 to 180°C for 30 to 60 min of treatment. The results indicated that degradation of cellulose and hemicellulose of heat-treated bamboo was attributed to plasticization of lignin during heating in the same time hydrolysed the starch content.

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“…This difference led to more xylose loss in NMR method and needs conversion factor. In acidic medium, furfural was not stable intermediate which could be further reacted to the degradation or condensation (Root et al 1959;Abatzoglou et al 1990). Due to still lower xylose content in 1 H-NMR spectroscopic method, we tried to check the conversion factor for accurate xylose content estimation.…”

Section: Resultsmentioning

confidence: 97%