BioChem - DOS

A green process for simultaneous production of fructose and ethanol via selective fermentation

Journal of cleaner production

Putra, Meilana Dharma; Sulieman, Ashraf K.; Abasaeed, Ahmed E.; Gaily, Mohamed H.; Al-Zahrani, Saeed M.; Zeinelabdeen, Mohamed A.; Atiyeh, Hasan K.

<P><B>Abstract</B></P> <P>Date <I>(Phoenix dactylifera</I> L.<I>)</I> fruits can provide a renewable source for the production of fructose and ethanol through selective fermentation processes. The effects of scale-up on ethanol yield and remaining fructose from date syrup in three 1 L, 7.5 L and 80 L fermentors were investigated. Fermentations were simultaneously conducted in the fermentors (working volume ratios of 1:10:100) using date syrups having an initial total sugars concentration of 142.5 g/L and <I>Saccharomyces cerevisiae</I> ATCC 36859 at 30 &deg;C and 120 rpm. Experiments showed good and comparable results for the three fermentors. Glucose was completely consumed in the three fermentors. Fructose remained was 83.5%, 89.6% and 90.7% in the 1 L, 7.5 L and 80 L fermentors. The ethanol yields were 59.1%, 76.4% and 75.4%. The fructose fraction in the final syrup was >93% in the three fermentors. Statistically insignificant differences (p > 0.05) were obtained for the two larger fermentors. A kinetic model based on Monod equation was developed and successfully tested against the experimental data; also, the hydrodynamic was investigated using dimensionless correlations. A conceptual framework for the process was proposed. These results could provide a step forward towards commercialization of this clean process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Selective fermentation is a viable route for producing fructose and ethanol. </LI> <LI> Highly concentrated fructose solutions were produced from date syrups. </LI> <LI> Scaling the fermentors by 100 folds has minimal effect on fermentation performance. </LI> <LI> External mass transfer resistance affects fermentation performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

2017

Elsevier

0959-6526

1879-1786

162

pp.420-426

10.1016/j.jclepro.2017.06.069

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART78163579

Date syrup; Fructose; Ethanol; Selective fermentation; Saccharomyces cerevisiae; Scale-up