A Preliminary Assessment of Aqueous Ethanol Pulping of Bagasse: The Ecopulp Process

Lavarack, Bryan, Rainey, Thomas J., Falzon, Kaye L., & Bullock, Graeme (2005) A Preliminary Assessment of Aqueous Ethanol Pulping of Bagasse: The Ecopulp Process. International Sugar Journal, 107(1283), pp. 611-615.

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SRI has examined the organosolv (organic solvation) pulping of Australian bagasse using technology supplied by Ecopulp. In the process, bagasse is reacted with aqueous ethanol in a digester at elevated temperatures (between 150 degrees Celsius and 200 degrees Celsius). The products from the digester are separated using proprietary technology before further processing into a range of saleable products. Test trials were undertaken using two batch digesters; the first capable of pulping about 25g of wet depithed bagasse and the second, larger samples of about 1.5kg of wet depithed bagasse. From this study, the unbleached pulp produced from fresh bagasse did not have very good strength properties for the production of corrugated medium for cartons and bleached pulp. In particular, the lignin contents as indicated by the Kappa number for the unbleached pulps are high for making bleached pulp. However, in spite of the high lignin content, it is possible to bleach the pulp to acceptable levels of brightness up to 86.6%ISO. The economics were assessed for three tier pricing (namely low, medium and high price). The economic return for a plant that produces 100 air dry t/d of brownstock pulp is satisfactory for both high and medium pricing levels of pricing. The outcomes from the project justify that work should continue through to either pilot plant or upgraded laboratory facility.

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ID Code: 4873
Item Type: Journal Article
Refereed: No
Additional URLs:
Keywords: Pulp, Ehtanol, Biorefinery, Bagasse, Fractionation
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Timber Pulp and Paper (091210)
Divisions: Current > QUT Faculties and Divisions > Division of Research and Commercialisation
Copyright Owner: Copyright 2005 (The authors)
Deposited On: 04 Sep 2006 00:00
Last Modified: 29 Feb 2012 13:17

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