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Supercritical hydrolysis of cellulose for oligosaccharide production in combined technology

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Abstract.
A combined supercritical/subcritical technology was used as a pre-treatment and hydrolysis method for
ethanol production from cellulose/lignocelluloses. In a batch study for supercritical hydrolysis, which
is the primary step of the combined technology, 60 mg of microcrystalline cellulose in 2.5 ml deionized
water was loaded into each reactor and heated in a salt bath at a selected temperature for a specified
reaction time. Cellulose was quickly hydrolyzed to oligosaccharides, hexoses and other small molecular
products at temperatures above the critical point of water. Temperature and reaction time were the two
key parameters that determined the products of cellulose hydrolysis. The highest yield of oligosaccharides
(approximately 40%) was obtained at optimum conditions of 380 ◦C and a reaction time of 16 s. The
corresponding yield of hexoseswas 24%, giving a maximum yield of hydrolysis products of approximately
63%. A complete decomposition of hydrolysis products occurred at higher temperatures and/or longer
reaction times. A kinetic analysiswas performed to explain the reaction of cellulose in supercriticalwater.
The results presented here provide a rigid framework for the use of combined supercritical/subcritical
technology in subsequent research.

Keywords: Cellulose hydrolysis, Supercritical water, Oligosaccharides production, Lignocellulosic waste, Combined supercritical/subcritical, technology

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Informasi Detail

Judul Seri

Chemical Engineering Journal

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Chemical Engineering Journal 150 (2009) 411–417

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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