Acid Hydrolysis of Cellulose

Fan, L.T.; Gharpuray, Mahendra Moreshwar; Lee, Yong-Hyun

doi:10.1007/978-3-642-72575-3_4

Cited by 46 publications

(40 citation statements)

References 97 publications

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“…Most hydrolysis data were fit to this simple model from 1945 to 1990, and Table 21 shows the model parameters from various studies. 253 Using these parameters the maximum yield of glucose is always less than 70%. Enzymatic hydrolysis can produce glucose yields above 95% as shown in Table 19.…”

Section: Hydrolysismentioning

confidence: 99%

“…The proton can either attack the oxygen bond between the two glucose units or the cyclic oxygen, which is defined as pathways A-1 and A-2, respectively. 253 The mechanism is thought to involve the rapid formation of an intermediate complex with the oxygen and proton, followed by the slow splitting of glucosidic bonds by the addition of a water molecule.…”

Section: Hydrolysismentioning

confidence: 99%

“…253 After the rapid initial decrease, the DP reaches an asymptotic value where the DP remains at a constant value called the degree of polymerization (LOPD). The LODP is dependent on the type of cellulose samples and is reached when only 2-5% of the sample has been hydrolyzed.…”

Section: Hydrolysismentioning

confidence: 99%

“…Recrystallization can occur during acid or enzymatic hydrolysis. 253 Prior to enzymatic hydrolysis, the cellulose structure must be pretreated to open up the structure of biomass for reaction of the cellulose with cellulase. Initially, a process was designed to produce ethanol through enzymatic hydrolysis by separate hydrolysis and fermentation (SHF) steps.…”

Section: Hydrolysismentioning

confidence: 99%

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Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

2006

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Section: Hydrolysismentioning

confidence: 99%

Section: Hydrolysismentioning

confidence: 99%

Section: Hydrolysismentioning

confidence: 99%

Section: Hydrolysismentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

2006

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“…(4) was used to obtain the DP as hydrolysis approaches equilibrium. This empirical equation was chosen since it has been found to fit data for acid hydrolysis of cellulose consisting of crystalline and amorphous regions [23]. The Blue 19-substituted cellulose data had an R 2 of 0.993, and the pure cellulose data had an R 2 of 0.999. ðDP À DP 0 Þ À1 ¼ ðktÞ À1 þ À DP eq À DP 0 Á À1 ð4Þ…”

Section: Validation Of Molecular Modelingmentioning

confidence: 99%

An explanation of increased hydrolysis of the β-(1,4)-glycosidic linkages of grafted cellulose using molecular modeling

Karst

Yang

Tanaka³

2006

Polymer

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Grafting various groups onto cellulose is found to substantially increase acid hydrolysis of the b-(1,4)-glycosidic linkages. Molecular modeling is used to explain how various substituents such as esters and ethers cause this phenomenon. A substituent helps stabilize hydrolyzed cellulose by serving as an anchor to the end of the cleaved cellulose to which it is bonded, making it less mobile, and allowing it to have stronger interactions than those in pure hydrolyzed cellulose. Hydrolysis increases with increasing size of the substituent. Molecules sorbed but not grafted to cellulose do not increase hydrolysis. Hydrolysis mainly occurs at glucoses bonded to the substituent, and supporting experiments show that hydrolysis approaches equilibrium when no substituent remains on the cellulose fiber.

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Polyvinyl alcohol and allyl α, α'‐trehalose copolymers for a sustainable strengthening of degraded paper

Poggi

Papacchini

Baracani

et al. 2021

J of Applied Polymer Sci

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Acid-catalyzed hydrolysis of glycosidic bonds is the most important degradation mechanism affecting cellulose-based materials. It results in the decrease of DP and in the loss of the original mechanical properties. The neutralization of acidity is therefore one of the most efficient ways to hamper the degradation of cellulosic artworks. However, in the case of acidic and strongly degraded artifacts, in addition to deacidification, a consolidation treatment must be performed. To this aim, a new class of biopolymers, obtained by a synthetic procedure that considers the principles of Sustainable Chemistry, was investigated. Three allyl saccharide/vinyl acetate copolymers, having different molar ratios between starting monomers, were prepared using α,α'-trehalose, and used to synthesize the corresponding allyl saccharide/vinyl alcohol copolymers. The use of saccharide derivatives as monomers improves the affinity and compatibility of the biopolymer with the artifacts to be treated. After characterization, the efficacy of the copolymers in the strengthening of degraded paper was evaluated with mechanical tests. The most effective system was thus selected for further testing. Its performance was compared to that of Klucel G ® , a commercial product belonging to the class of cellulose derivatives, which are largely used in conservation practice.

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Acid Hydrolysis of Cellulose

Cited by 46 publications

References 97 publications

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

An explanation of increased hydrolysis of the β-(1,4)-glycosidic linkages of grafted cellulose using molecular modeling

Polyvinyl alcohol and allyl α, α'‐trehalose copolymers for a sustainable strengthening of degraded paper

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