Ethanol production from olive oil extraction residue pretreated with hot water.
The olive pulp fraction contained in the residue generated in olive oil extraction by a two-step centrifugation process can be upgraded by using the cellulose fraction to produce ethanol and recovering high value phenols (tyrosol and hydroxytyrosol). Olive pulp was pretreated in a laboratory scale stirred autoclave at different temperatures (150-250 degrees C). Pretreatment was evaluated regarding cellulose recovery, enzymatic hydrolysis effectiveness, ethanol production by a simultaneous saccharification and fermentation process (SSF), and phenols recovery in the filtrate. The pretreatment of olive pulp using water at temperatures between 200 degrees C and 250 degrees C enhanced enzymatic hydrolysis. Maximum ethanol production (11.9 g/L) was obtained after pretreating pulp at 210 degrees C in a SSF fed-batch procedure. Maximum hydroxytyrosol recovery was obtained in the liquid fraction when pretreated at 230 degrees C.
Ballesteros
Ignacio
I
Centro de Investigaciones Energéticas Medioambientales Y Technológicas, Renewable Energies Department, Madrid, Spain.
Oliva
José Miguel
JM
Negro
Maria José
MJ
Manzanares
Paloma
P
Ballesteros
Mercedes
M
D002482:Cellulose / Q000302:isolation & purification / Q000378:metabolism; D000431:Ethanol / Q000302:isolation & purification* / Q000378:metabolism*; D005285:Fermentation; D006358:Hot Temperature; D006868:Hydrolysis; D007700:Kinetics; D007716:Kluyveromyces / Q000254:growth & development / Q000378:metabolism; D000069463:Olive Oil; D010936:Plant Extracts / Q000378:metabolism*; D010938:Plant Oils / Q000378:metabolism*; D013816:Thermodynamics; D014867:Water
D000069463:Olive Oil; D010936:Plant Extracts; D010938:Plant Oils; D014867:Water; D000431:Ethanol; D002482:Cellulose