Selection and application of nontoxic solvents in extractive ethanol fermentation

Lemos, Diego Andrade; Sonego, Jorge Luíz Silveira; Boschiero, Martina; Araujo, Everaldo Cesar Costa; Cruz, Antonio José Gonçalves; Badino, Alberto Colli

doi:10.1016/j.bej.2017.08.003

Cited by 24 publications

(14 citation statements)

References 31 publications

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“…The K DE values were used in the simulation of the extractive fermentations as a function of C E . An important point is that using oleic acid, there was a considerable difference between the K DE values at the beginning (0.17 kg kg ‐1 ) and end (0.26 kg kg ‐1 ) of the extractive fermentation process . In previous work, Offeman et al found values for oleic acid of 0.19 and 0.16 in hydroalcoholic solutions with 5% w w ‐1 ethanol and initial pH of 5.9 and 3.4, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…This process starts with screening for biocompatible solvents, followed by experimental assays using selected solvents in order to characterize the best one in terms of its ethanol extraction capacity . Oleic acid, a solvent that is nontoxic towards Saccharomyces cerevisiae , has already been used for ethanol extraction in different processes and configurations . However, it has not yet been used in extractive ethanol fermentation employing a drop column bioreactor (DCB) with recirculation of the solvent.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] Oleic acid, a solvent that is nontoxic towards Saccharomyces cerevisiae, has already been used for ethanol extraction in different processes and configurations. [17][18][19][20][21][22] However, it has not yet been used in extractive ethanol fermentation employing a drop column bioreactor (DCB) with recirculation of the solvent.…”

Section: Introductionmentioning

confidence: 99%

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In situ extractive ethanol fermentation in a drop column bioreactor

Lemos

Sonego

Cruz

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND In conventional ethanol fermentation processes, the low ethanol content in the wine is due to inhibition of its production by the yeast cells. Extractive fermentation is an alternative process that can be used to overcome product inhibition by removing the ethanol from the fermentation broth. The present study describes the modeling and experimental validation of ethanol production in extractive batch fermentation, with in situ ethanol extraction by oleic acid, in a non‐conventional drop column bioreactor (DCB) operated under industrial conditions. RESULTS A model was developed using the hybrid Andrews–Levenspiel equation and the ethanol distribution coefficient (KDE), which provided an excellent description of the extractive fermentation process with oleic acid. Furthermore, higher ethanol productivities were obtained in the extractive fermentations, with ethanol productivity of 11.27–12.98 kg m‐3 h‐1, 12.7–29.8% higher when compared with the conventional process without ethanol removal. This was especially evident for the best extractive fermentation, which finished around 2 h earlier than the conventional fermentation. CONCLUSION The DCB showed good performance for use in extractive fermentation with liquid–liquid extraction of the ethanol and this technique presented higher ethanol productivity compared with the conventional process. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In situ extractive ethanol fermentation in a drop column bioreactor

Lemos

Sonego

Cruz

et al. 2017

J of Chemical Tech & Biotech

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“…In many separation processes performed by industry, large quantities of volatile and flammable organic solvents are used, thus, affecting the environmental and economic performance of the overall extraction [10]. Therefore, currently there is a search for nontoxics solvents that generate less waste and reduce costs [11,12].…”

Section: Introductionmentioning

confidence: 99%

Specific Energy: A New Approach to Ultrasound-assisted Extraction of Natural Colorants

Strieder¹,

Silva²,

Meireles³

2019

fph

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The demand for natural colorants has boosted the search for innovative technologies to obtain them. Ultrasound-assisted extraction (UAE) is one of the new green techniques that has been studied due to its process advantages that include high yields, short extraction times and nonutilization of elevated temperatures. However, a nonstandardization of the UAE variables complicates comparisons and hinders progress in the studies of this topic. In this review, the focus is the verification and discussion of which UAE process conditions authors have used to obtain natural colorants. Thus, it is possible to confirm that some authors used ultrasonic systems that are not appropriate for performing a good extraction, that some used a great amount of solvent and a long extraction time, and that researchers did not express the main variables (nominal power, extraction time and sample mass) as a function of the specific energy applied to processing. Therefore, it is possible to conclude that some studies using UAE were not conducted to obtain the best results, and the expression of the variables as a function of specific energy can generate a standardization, which facilitates comparison among the results obtained by the scientific community.

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“…There are several processes for the purification of alcohols and production of anhydrous alcohols, such as azeotropic and extractive distillation (Zhao et al 2017), absorption (Fei and Hongzhang 2009), gas stripping (Schläfle et al 2017); pervaporation (Bello et al 2014;Xu et al 2018); solvent extraction (Lemos et al 2017), and adsorption (Farzaneh et al 2017;Pal et al 2017;Raganati et al 2018). Combination of one or more of these methods can also be employed to enhance the efficiency of the process.…”

Section: Introductionmentioning

confidence: 99%

Agricultural byproducts-based biosorbents for purification of bioalcohols: a review

Dhabhai

Niu

Dalai

2018

Bioresour. Bioprocess.

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For the purification of alcohols derived from microbial fermentations, extensive processing is required. Adsorption is described as one of the most cost-effective and efficient techniques for the separation of water and purification of alcohols. Biobased sorbents (called biosorbents) are advantageous for dehydration of alcohols as they can be developed from cost-effective feedstocks such as waste agricultural biomass or byproducts, have adsorption capacities at par with chemical adsorbents, and can be safely disposed. Alternatively, the spent adsorbents can be reused for fuel or energy production. Agricultural byproducts are low cost and abundantly available materials containing cellulose, hemicellulose, proteins, and lignin as their constituents. Biosorbents have the capability to adsorb water by the polar interaction of their hydroxyl, carboxyl, carbonyl, and amine groups with water molecules. The pore size distribution and thermal stability of biosorbents are also industrially relevant features. They are a promising option to be used in industries for dehydration of alcohols. This paper reviews adsorptive purification of bioalcohols with a focus on using biosorbents, and describes their structure, global availability, water adsorption mechanism, and the use of biosorbents in liquid phase and vapor phase adsorption systems for the purification of ethanol, butanol, and other higher alcohols.

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Selection and application of nontoxic solvents in extractive ethanol fermentation

Cited by 24 publications

References 31 publications

In situ extractive ethanol fermentation in a drop column bioreactor

In situ extractive ethanol fermentation in a drop column bioreactor

Specific Energy: A New Approach to Ultrasound-assisted Extraction of Natural Colorants

Agricultural byproducts-based biosorbents for purification of bioalcohols: a review

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