Pequi cake composition, hydrolysis and fermentation to bioethanol

A. L. Macedo, R. S. Santos, L. Pantoja, A. S. Santos
2011 Brazilian Journal of Chemical Engineering  
Pequizeiro (Caryocar brasiliense Camb) fruits have been evaluated as a potential raw material for the newly established biodiesel industry. This scenario demands applications using the solid co-product derived from the extraction of pequi oil, called cake or meal. This study analyses the acid hydrolysis of carbohydrates present in the pequi meal in order to obtain fermentable sugars and evaluates their conversion to bioethanol. There was 27% starch in the pequi meal. The use of a CCRD
more » ... of a CCRD experimental design type to study the acid saccharification of pequi meal results in 61.6% conversion of its starch content to reducing sugars. Positive and significant linear effects were observed for H 2 SO 4 concentration and temperature factors, while the quadratic effect of H 2 SO 4 concentration and the linear effect of solid-liquid ratio were negative. Even, with non-optimized fermentative condition using 1% of dried baker's yeast in conical flasks, it was possible to obtain a value equivalent to 53 L of ethanol per ton of hydrolyzed pequi meal.
doi:10.1590/s0104-66322011000100002 fatcat:fzdqskew6bhpjkms5c6an4gthu