Comparison of homogeneous and heterogeneous acid promoters in single-step aqueous-organosolv fractionation of eucalyptus wood chips

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Author list: Klamrassamee T., Champreda V., Reunglek V., Laosiripojana N.

Publisher: Elsevier

Publication year: 2013

Journal: Bioresource Technology (0960-8524)

Volume number: 147

Start page: 276

End page: 284

Number of pages: 9

ISSN: 0960-8524

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883335370&doi=10.1016%2fj.biortech.2013.08.015&partnerID=40&md5=0adaa1422e65b2f1c5fca930d170a68b

Languages: English-Great Britain (EN-GB)

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Abstract

Fractionation of lignocellulosic biomass is a primary step for converting multi-structure biomass to biofuels and other industrial products in integrated biorefinery processes. Here, the effects of homogeneous and heterogeneous acid promoters (HNO3-, HCl-, H2SO4-, and H3PO4-activated carbons) on Clean Fractionation (CF), a single-step aqueous-organosolv fractionation, of eucalyptus wood chips was studied and optimised. The optimised process contained 16.7% w/v biomass in a ternary mixture of methyl isobutyl ketone:methanol:water (25:42:33) with 5% AC-H3PO4 and incubated at 180ฐC for 60min. Under these conditions, 41.2wt.% cellulose was obtained in enriched solid pulp with the average glucan content of 75.9%. The majority of the hemicelluloses was hydrolysed into the aqueous-methanol phase, which contained 17.8wt.% monomeric xylose and xylooligomers while 13.7wt.% lignin was separated into the organic phase. The heterogeneous acid-promoter process is a potent alternative to corrosive homogeneous acids for lignocellulose fractionation in integrated biorefineries. ฉ 2013 Elsevier Ltd.

Keywords

Organosolv fractionation, Solid acid promoter