Optimizing treatment condition of coir fiber with ionic liquid and subsequent enzymatic hydrolysis for future bioethanol production
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19
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2018
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Oliveira Ribeiro W.C.
Silva Lima A.C.
Araujo Morandim-Giannetti A.
Silva Lima A.C.
Araujo Morandim-Giannetti A.
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Periódico
Cellulose
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OLIVEIRA RIBEIRO, WILLIAM CESAR DE; SILVA LIMA, ANA CRISTINA DA; ARAÚJO MORANDIM-GIANNETTI, ANDREIA DE. Optimizing treatment condition of coir fiber with ionic liquid and subsequent enzymatic hydrolysis for future bioethanol production. Cellulose, v. 25, p. 527-536, 2017.
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© 2017, Springer Science+Business Media B.V., part of Springer Nature.In the present study, we pretreated coir fiber with an ionic liquid (IL), n-butylammonium acetate, to expose its cellulose fibers. The best IL pretreatment conditions were determined by central composite design using a desirability function to maximize the enzymatic hydrolysis. To collect data for this optimization, coir fiber was subjected to a pulping process with 9% (w/w) sodium hydroxide for 6 h at 137 °C with a pressure of 2.5 atm. The pulping fiber was then treated with the IL for a range of times and at a range of temperatures. Based on the results, the best treatment conditions were determined to be 90 °C for 40 h. The best conditions for enzymatic hydrolysis were determined to be pH 6 at 44.16 °C for 25.57 h. Under these conditions, 32.33 ± 1.08% of the coir fiber was converted to glucose. The efficiency obtained with pulped coir fiber was 14.34 ± 0.14% and with crude coir fiber was 6.27 ± 0.15%, demonstrating the benefits of the proposed IL pretreatment.