Ultrasound-assisted production of biodiesel and ethanol from spent coffee grounds.

Autor: Rocha MV; Universidade Federal do Ceará, Departamento de Engenharia Química, Fortaleza, CE, Brazil. Electronic address: valponterocha@yahoo.com.br., de Matos LJ; Universidade Federal do Ceará, Departamento de Engenharia Química, Fortaleza, CE, Brazil., Lima LP; Universidade Federal do Ceará, Departamento de Engenharia Química, Fortaleza, CE, Brazil., Figueiredo PM; Universidade Federal Rural do Semiárido, Departamento de Agrotecnologia e Ciências Sociais, Mossoró, RN, Brazil., Lucena IL; Universidade Federal Rural do Semiárido, Departamento de Agrotecnologia e Ciências Sociais, Mossoró, RN, Brazil., Fernandes FA; Universidade Federal do Ceará, Departamento de Engenharia Química, Fortaleza, CE, Brazil., Gonçalves LR; Universidade Federal do Ceará, Departamento de Engenharia Química, Fortaleza, CE, Brazil.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2014 Sep; Vol. 167, pp. 343-8. Date of Electronic Publication: 2014 Jun 17.
DOI: 10.1016/j.biortech.2014.06.032
Abstrakt: This study evaluates the production of biodiesel and ethanol from spent coffee grounds (SCG). The extraction of oil from SCG, biodiesel production and ethanol production processes were studied. The liquid-to-solid ratio and temperature were evaluated in the ultrasound-assisted extraction of the oil from SCG. The highest yield (12%) was obtained using 4 mL g(-1) liquid-to-solid ratio at 60°C for 45 min. The process to produce biodiesel showed a yield of 97% into fatty acid methyl esters (FAME). The highest glucose yield (192 mg g SCG(-1)) was obtained by hydrolysis with 0.4 mol L(-1) sulfuric acid at 121°C for 15 min. The hydrolysate was used as fermentation medium for ethanol production by Saccharomyces cerevisiae obtaining 19.0 g L(-1) at 10h of process of ethanol with a yield of ethanol and productivity of 0.50 g g(-1) and 1.90 g L(-1)h(-1), respectively. Spent coffee grounds were considered a potential feedstock for biodiesel and ethanol production.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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