BioChem - DOS

Keys for Bioethanol Production Processes by Fermentation and Ionic Liquid Extraction

ACS sustainable chemistry et engineering

Pé rez de los Rí os, Antonia; Herná ndez-Ferná ndez, Francisco José Zapata Henrí quez, Patricio Alfredo; Missoun, Fatiha; Herná ndez-Ferná ndez, Jesú s; Ortiz-Martí nez, Ví ctor; Salar-Garcí a, Marí a José Lozano Blanco, Luis Javier; Godí nez, Carlos

<P>Bioethanol is produced by fermenting biomass. However, the main drawback of this process is the high purification costs involved, which are due to the energy-intensive distillation step and a drying step if high ethanol purity is required. This work evaluates an alternative separation&ndash;purification process for the production of ethanol, in which an ionic liquid is used to develop an integrated extraction&ndash;fermentation process. The capacity of ionic liquids to extract ethanol from an ethanol aqueous solution and their biocompatibility with <I>Saccharomyces cerevisiae</I> was analyzed. Ethanol extraction percentages ranging from 33% to 62% were obtained with the following water insoluble ionic liquids: [EPy<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>] < [MTOA<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>] < [OMIM<SUP>+</SUP>][BF<SUB>4</SUB><SUP>&ndash;</SUP>] < [Hex<SUB>3</SUB>TDP<SUP>+</SUP>][dca<SUP>&ndash;</SUP>] < [Hex<SUB>3</SUB>TDP<SUP>+</SUP>][Br<SUP>&ndash;</SUP>] < [ Hex<SUB>3</SUB>TDP<SUP>+</SUP>][Cl<SUP>&ndash;</SUP>]. These ionic liquids could be used for in the postfermentation step of extraction. To evaluate the potential use of these ionic liquids as extraction phase in an integrated reaction/separation process, their biocompatibility with <I>S. cerevisiae</I> was analyzed. Of the above ionic liquids, [MTOA<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>], [BMIM<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>], [OMIM<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>], [BMIM<SUP>+</SUP>][PF<SUB>6</SUB><SUP>&ndash;</SUP>] and [Hex<SUB>3</SUB>TDP<SUP>+</SUP>][Cl<SUP>&ndash;</SUP>] were found to be biocompatible with <I>S. cerevisiae</I> because they allowed bacterial growth. From the extraction and biocompatibility tests, it can be concluded that [MTOA<SUP>+</SUP>][NTf<SUB>2</SUB><SUP>&ndash;</SUP>] and [Hex<SUB>3</SUB>TDP<SUP>+</SUP>][Cl<SUP>&ndash;</SUP>] would be suitable for an integrated extraction-fermentation process for ethanol production.</P><P>Ethanol production by extraction and fermentation with ionic liquids could overcome energy-intense and complex conventional high purity ethanol production.</P><P><B>Graphic Abstract</B><BR><IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ascecg/2017/ascecg.2017.5.issue-8/acssuschemeng.7b01170/production/images/medium/sc-2017-01170j_0003.gif'></P>

2017

American Chemical Society

2168-0485

5

8

pp.6986-6993

10.1021/acssuschemeng.7b01170

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART78344201

Bioethanol; Ionic liquids; Liquid&#x2212; liquid extraction; Fermentation; Saccharomyces cerevisiae;