Hydrolysis of dilute acid-pretreated cellulose under mild hydrothermal conditions

•The hydrolysis of cellulose assisted by microwave irradiation was greatly promoted.•The selectivity to glucose was enhanced by the dicarboxylic acid.•Oxalic acid preferentially removed the amorphous region of the cellulose. The hydrolysis of dilute acid-pretreated cellulose was investigated in a co...

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Bibliographic Details
Published in:Carbohydrate polymers 2014-10, Vol.111, p.116-124
Main Authors: Chimentão, R.J., Lorente, E., Gispert-Guirado, F., Medina, F., López, F.
Format: Article
Language:English
Subjects:
Applied sciences
Cellulose
Cellulose - chemistry
Cellulose - ultrastructure
Cellulose and derivatives
Dilute acid
Exact sciences and technology
Glucose
Heating
Hydrolysis
Microwave assisted
Microwaves
Natural polymers
Oxalic Acid - chemistry
Physicochemistry of polymers
Sulfuric Acids - chemistry
X-Ray Diffraction
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Summary:•The hydrolysis of cellulose assisted by microwave irradiation was greatly promoted.•The selectivity to glucose was enhanced by the dicarboxylic acid.•Oxalic acid preferentially removed the amorphous region of the cellulose. The hydrolysis of dilute acid-pretreated cellulose was investigated in a conventional oven and under microwave heating. Two acids – sulfuric and oxalic – were studied. For both hydrothermal conditions (oven and microwave) the resultant total organic carbon (TOC) values obtained by the hydrolysis of the cellulose pretreated with sulfuric acid were higher than those obtained by the hydrolysis of the cellulose pretreated with oxalic acid. However, the dicarboxylic acid exhibited higher hydrolytic efficiency towards glucose. The hydrolysis of cellulose was greatly promoted by microwave heating. The Rietveld method was applied to fit the X-ray patterns of the resultant cellulose after hydrolysis. Oxalic acid preferentially removed the amorphous region of the cellulose and left the crystalline region untouched. On the other hand, sulfuric acid treatment decreased the ordering of the cellulose by partially disrupting its crystalline structure.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.04.001