Degradation of cellulose polymorphs into glucose by HCl gas with simultaneous suppression of oxidative discoloration

Wang, Yingfeng; Pääkkönen, Timo; Miikki, Kim; Maina, Ndegwa Henry; Nieminen, Kaarlo; Zitting, Aleksi; Penttilä, Paavo A.; Han, Tao

doi:10.1016/j.carbpol.2022.120388

Cited by 6 publications

(3 citation statements)

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“…The humin formation is visible as discoloration of the samples during hydrolysis (Figure S2), but humins are such strong chromophores that even trace amounts result in darkening. 15,22 According to HPLC measurements, the degradation of HMF to formic and levulinic acid was negligible. In addition, the samples do contain acetic acid (0.7%−7% of the dry weight of wood) originating from the acetyl groups of hemicellulose.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Anhydrous HCl gas has been used for concentrated acid hydrolysis in various studies and pilot scale operations since the late 19th century to convert biomass into oligosaccharides and monosaccharides. However, most of earlier research has concentrated on breaking down crystalline cellulose into glucose − or on isolating cellulose nanocrystals from fibers. ,, The purpose of this study is to demonstrate the utilization of HCl gas as a pretreatment step for nearly exclusive hydrolysis of xylan directly from an aspen wood flour sample. The idea is to adjust the HCl concentration inside biomass to 36% under the pressure of 0.1 MPa, which enables the selective removal of C5 sugars as the HCl concentration is maintained under the 40% threshold where crystalline cellulose would be degraded.…”

Section: Introductionmentioning

confidence: 99%

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Pretreatment to Retrieve Xylose and Xylooligosaccharides by HCl Gas Directly from Biomass

Kilpinen,

Nieminen,

Kontturi

2024

ACS Sustainable Chem. Eng.

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In this study, anhydrous hydrogen chloride gas was employed to selectively hydrolyze hemicellulose from aspen wood flour utilizing a gas–solid system. Selectivity toward hemicellulose was achieved by adjusting the acid concentration inside wood flour to 36% during gas hydrolysis, so only hemicellulose and disordered cellulose would be degraded during hydrolysis. Process parameters included the moisture content of the aspen wood flour (20%, 40%, and 60%) and reaction times from 30 min to 24 h. The optimal reaction conditions for the production of xylose and xylooligosaccharides was achieved with 40% moisture content and 6 h reaction time. Under these parameters, it was possible to retrieve 84% of the available xylan from aspen wood flour with only 1% glucan degradation.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pretreatment to Retrieve Xylose and Xylooligosaccharides by HCl Gas Directly from Biomass

Kilpinen,

Nieminen,

Kontturi

2024

ACS Sustainable Chem. Eng.

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“…Cellulose is a large linear homopolymer with a high degree of polymerization, in which the main component is monomeric glucose that can form fibrils of up to 15,000 glucose units. The internal glucose units in cellulose are connected by a β-1,4-glycosidic bond and have a strong fiber structure [ 5 ]. Cellulose is easy to obtain in nature and has a single structure.…”

Section: Introductionmentioning

confidence: 99%

Fast Pyrolysis of Cellulose and the Effect of a Catalyst on Product Distribution

Sun

Zhang

Yang

et al. 2022

IJERPH

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Fast pyrolysis of microcrystalline cellulose (MC) was carried out by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The effects of temperature, time, and a catalyst on the distribution of the pyrolysis products were analyzed. The reaction temperature and time can significantly affect the types and yields of compounds produced by cellulose pyrolysis. A pyrolysis temperature of 500–600 °C and pyrolysis time of 20 s optimized the yield of volatile liquid in the pyrolysis products of cellulose. In all catalytic experiments, the relative contents of alcohols (1.97%), acids (2.32%), and esters (4.52%) were highest when K2SO4 was used as a catalyst. HZSM-5 promoted the production of carbohydrates (92.35%) and hydrocarbons (2.20%), while it inhibited the production of aldehydes (0.30%) and ketones (1.80%). MCM-41 had an obvious catalytic effect on cellulose, increasing the contents of aldehydes (41.58%), ketones (24.51%), phenols (1.82%), furans (8.90%), and N-compounds (12.40%) and decreasing those of carbohydrates (5.38%) and alcohols (0%).

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Enhanced Production of Furfural via Methanolysis of Wood Biomass with HCl Gas

Topias Kilpinen,

Yousefi,

Kontturi

2024

ChemSusChem

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This study explores the production of furfural, xylose and methylxylosides through the methanolysis of wood flour using anhydrous HCl gas. The process involves methanolysis of wood flour with HCl gas under pressure to generate methylxylosides, which are subsequently converted to xylose and furfural via autohydrolysis in a Parr batch reactor system. The methanolysis was conducted in temperature‐controlled HCl gas chamber employing 24 h reaction time and 50% methanol content in wood flour. During the methanolysis step with HCl gas, 65% of the available xylan in wood flour was converted to water‐soluble methylxylosides, xylose, xylooligosaccharides (XO) and water‐soluble methyl xylooligosaccharides (MXO). Methanolysis filtrates were then autohydrolyzed with Parr 50 mL batch reactor system to xylose and furfural in two different pH values at 180˚C. The highest furfural yield of 91% from methanolysis filtrate was achieved with pH 1.2 and 25 min reaction time.

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Degradation of cellulose polymorphs into glucose by HCl gas with simultaneous suppression of oxidative discoloration

Cited by 6 publications

References 50 publications

Pretreatment to Retrieve Xylose and Xylooligosaccharides by HCl Gas Directly from Biomass

Pretreatment to Retrieve Xylose and Xylooligosaccharides by HCl Gas Directly from Biomass

Fast Pyrolysis of Cellulose and the Effect of a Catalyst on Product Distribution

Enhanced Production of Furfural via Methanolysis of Wood Biomass with HCl Gas

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