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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhancing liquid hot water (LHW) pretreatment of sugarcane bagasse by high pressure carbon dioxide (HP-CO2)

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Author(s):
Alves Gurgel, Leandro Vinicius [1, 2] ; Borges Pimenta, Maria Teresa [3] ; da Silva Curvelo, Antonio Aprigio [2, 3]
Total Authors: 3
Affiliation:
[1] Univ Fed Ouro Preto, Inst Ciencias Exatas & Biol, Dept Quim, Grp Fis Quim Organ, BR-35400000 Ouro Preto, MG - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Fis Quim, Grp Fis Quim Organ, BR-13560970 Sao Carlos, SP - Brazil
[3] Ctr Pesquisa Energia & Mat CNPEM, Lab Nacl Ciencia & Tecnol Bioetanol CTBE, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: INDUSTRIAL CROPS AND PRODUCTS; v. 57, p. 141-149, JUN 2014.
Web of Science Citations: 29
Abstract

Liquid hot water (LHW) pretreatment associated with high pressure carbon dioxide (HP-CO2) was evaluated as a potential green pretreatment technology for extraction of hemicelluloses from depithed sugarcane bagasse to produce fermentable sugars. Developing a technology based on the use of low cost, non-corrosive, and recoverable chemicals as CO2 can result in a more efficient and economic process. In this study, depithed sugarcane bagasse was treated with LHW and HP-CO2 at milder temperatures in comparison with LHW pretreatment alone. To assess the effects of varying pretreatment operational conditions on extraction of xylo-oligosaccharides and xylose release with cellulose preservation a central composite design (CCD) of experiments was used. The pretreatments were carried out at temperatures ranging from 93.8 degrees C (8.62 MPa) to 136.2 degrees C (12.96 MPa) and times from 17.6 to 102.4 min with a liquid-to-solid ratio of 12:1. The maximum xylan and xylose concentrations were achieved by treating depithed bagasse at 100 degrees C for 30 min and 115 degrees C for 60 min, respectively. At these conditions the amount of xylan equivalent ranged 10-12 g/L. At 115 degrees C for 60 min, the cellulose preservation achieved 97.2%. The obtained results showed that HP-CO2 proved to be an efficient hydrolysis agent. Samples of LHW-HP-CO2 pretreated bagasse were tested for enzymatic digestibility. Depithed bagasse pretreated at 115 degrees C for 60 min after enzymatic hydrolysis had a glucose yield of 30.43 g/L and a cellulose conversion of 41.17%. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 07/51755-0 - Development of analytical methodologies and organosolv delignification processes applied to bagasse and straw from sugarcane
Grantee:Antonio Aprigio da Silva Curvelo
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)