Comparison Study of Different Ionic Liquid Pretreatments in Maximizing Total Reducing Sugars Recovery

BioResources, 9 (1), 1552-1564.

13 Pages Posted: 19 Jan 2015

See all articles by Kiat Moon Lee

Kiat Moon Lee

University of Malaya (UM)

Gek-Cheng Ngoh

University of Malaya (UM) - Department of Chemistry

Adeline Seak May Chua

University of Malaya (UM)

Li Wan Yoon

University of Malaya (UM)

Teck Nam

The University of Auckland

Min Gyu Lee

Pukyong National University

Date Written: 2014

Abstract

A process scheme combining the most suitable ionic liquid pretreatment, followed by solid acid and enzymatic saccharification was used to maximize the reducing sugars recovery from sago waste. Three types of ionic liquids, i.e. 1-butyl-3-methylimidazolium chloride ([BMIM]Cl), 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) and 1-ethyl-3-methylimidazolium diethyl phosphate ([EMIM][(EtO)2PO2]) were evaluated based on their performance in terms of the total reducing sugars recovery, chemical cost, and pretreatment energy requirement. The results showed that all the ionic liquids assisted the saccharification processes by dissolving and depolymerizing the carbohydrates of the sago waste into shorter chain soluble oligosaccharides, as well as disrupting the biomass structure to produce an amorphous pretreated solid residue. The solid acid saccharifications of the prehydrolysates obtained from the [BMIM]Cl pretreatment gave the highest reducing sugars recovery (61-63%) irrespective of the solid acid catalyst employed. On the other hand, enzymatic saccharification of [EMIM][OAc] pretreated solid residues showed the highest reducing sugars recovery (29%). A maximum recovery of 90% reducing sugars was achieved via incorporation of the ionic liquid pretreatment, solid acid and enzymatic saccharifications using [BMIM]Cl, Amberlyst 15 (A15) and Trichoderma viride cellulase respectively. This study suggests that the combined sequential process can maximize the reducing sugars recovery from sago waste effectively.

Keywords: Sago waste; Ionic liquid pretreatment; Solid acid saccharification; Enzymatic saccharification; Reducing sugars

JEL Classification: C09, C93, N55, O13, Q00, Q10, Q16, Q20, Q23, Q40, Q42

Suggested Citation

Lee, Kiat Moon and Ngoh, Gek-Cheng and Chua, Adeline Seak May and Yoon, Li Wan and Ang, Teck Nam and Lee, Min Gyu, Comparison Study of Different Ionic Liquid Pretreatments in Maximizing Total Reducing Sugars Recovery (2014). BioResources, 9 (1), 1552-1564., Available at SSRN: https://ssrn.com/abstract=2550038

Kiat Moon Lee

University of Malaya (UM) ( email )

Kuala Lumpur, Wilayah Persekutuan 50603
University of Malaya (UM)
Kuala Lumpur, Wilayah Persekutuan 50603
Malaysia

Gek-Cheng Ngoh

University of Malaya (UM) - Department of Chemistry

Jalan Lembah Pantai
Kuala Lumpur, Wilayah Persekutuan 50603
Malaysia

Adeline Seak May Chua

University of Malaya (UM) ( email )

Kuala Lumpur, Wilayah Persekutuan 50603
University of Malaya (UM)
Kuala Lumpur, Wilayah Persekutuan 50603
Malaysia

Li Wan Yoon

University of Malaya (UM) ( email )

Kuala Lumpur, Wilayah Persekutuan 50603
University of Malaya (UM)
Kuala Lumpur, Wilayah Persekutuan 50603
Malaysia

Teck Nam Ang (Contact Author)

The University of Auckland ( email )

Department of Chemical and Materials Engineering
Auckland, AK 1010
New Zealand

Min Gyu Lee

Pukyong National University ( email )

599-1 Daeyeo-dong, Nam-Gu
Pusan 608-737
Korea, Republic of (South Korea)

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