scholarly journals Integration of First- and Second-generation Bioethanol Production from Beet molasses and Distillery Stillage After Dilute Sulfuric Acid Pretreatment

2021 ◽  
Author(s):  
D. Mikulski ◽  
G. Kłosowski
Keyword(s):  
Ethanol Production ◽  
First Generation ◽  
Second Generation ◽  
Raw Material ◽  
Dilute Acid Pretreatment ◽  
Acid Pretreatment ◽  
Fourfold Increase ◽  
Beet Molasses ◽  
Dilute Sulfuric Acid Pretreatment ◽  
By Products

AbstractThe possibility of using waste distillery stillage (first-generation technology) after dilute acid pretreatment, as a medium for the preparation of beet molasses mash, for ethanol production according to the simultaneous saccharification and fermentation (SSF) technology, was assessed. The combination of lignocellulosic hydrolysates made from acid-pretreated stillage with sugar-rich beet molasses is an effective way of utilizing the first-generation ethanol production by-products in the second-generation ethanol production technology. It was demonstrated that the final ethanol concentration could be as high as 90 g/L. The process yield was over 94% of the theoretical yield when the molasses was diluted using acid-pretreated maize distillery stillage. An attempt to increase the pool of fermentable sugars by using cellulases to hydrolyze cellulose failed due to product inhibition in the fermentation medium with a high glucose concentration. A more than threefold increase in the concentration of ethyl acetate (even up to 924.4±11.8 mg/L) was observed in the distillates obtained from the media incubated with cellulases. The use of beet molasses combined with the hydrolysate of pretreated distillery stillage also changed the concentration of other volatile by-products. An increase in the concentration of aldehydes (mainly acetaldehyde to a concentration of above 1500 mg/L), methanol, 1-propanol, and 1-butanol was observed, while the concentration of higher alcohols (isobutanol, 2-methyl-1-butanol, 3-methyl-1-butanol) decreased. Interestingly, the use of cellulases in fermentation media from molasses and stillage hydrolysates resulted in an average fourfold increase in the concentration of this ester to a maximum level of 924.4±11.8 mg/L. Hydrolysates made from acid-pretreated distillery stillage, combined with sugar-rich beet molasses to boost the efficiency of the conversion process, can be successfully used in the production of second-generation fuel ethanol. However, further optimization of the cellulose enzymatic hydrolysis process is required for efficient use of the raw material.

scholarly journals Development opportunities of biomass-based ethanol production in relation to starch- and cellulosebased bioethanol production

2013 ◽  
pp. 71-75
Author(s):  
Zoltán Balla
Keyword(s):  
Ethanol Production ◽  
Life Cycle Analysis ◽  
Liquid Fuel ◽  
First Generation ◽  
Second Generation ◽  
Point Of View ◽  
Raw Material ◽  
Bioethanol Production ◽  
Fuel Production ◽  
Second Generation Bioethanol

The biomass is such a row material that is available in large quantities and it can be utilizied by the biotechnology in the future. Nowadays the technology which can process ligno cellulose and break down into fermentable sugars is being researched. One possible field of use of biomass is the liquid fuel production such as ethanol production. Based on the literary life cycle analysis, I compared the starch-based (first generation) to cellulose-based (second generation) bioethanol production in my study considering into account various environmental factors (land use, raw material production, energy balance). After my examination I came to the conclusion that the use of bioethanol, independent of its production technology, is favorable from environmental point of view but the application of second generation bioethanol has greater environmentally benefits.

Dilute acid pretreatment of starch-containing rice hulls for ethanol production

Holzforschung ◽  
2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Yoney López ◽  
Beatriz Gullón ◽  
Jürgen Puls ◽  
Juan C. Parajó ◽  
Carlos Martín
Keyword(s):  
Ethanol Production ◽  
Sulfuric Acid Concentration ◽  
Enzymatic Saccharification ◽  
Raw Material ◽  
Dilute Acid Pretreatment ◽  
Small Scale ◽  
Dilute Acid ◽  
Acid Pretreatment ◽  
Rice Hulls ◽  
Pretreatment Conditions

Abstract Rice hulls are potential low-cost feedstocks for fuel ethanol production in many countries. Most of the relevant publications are devoted to homogenous (high quality) hulls generated in industrial mills. On the other hand, small-scale mills give rise to hulls containing grain fragments and bran. In the present work, the dilute-acid pretreatment of such heterogeneous rice hulls was investigated based on a central composite rotatable experimental design. The variables were: temperature (140–210°C), biomass load (5–20%), and sulfuric acid concentration (0.5–1.5% based on reaction mixture). A total of 16 experimental runs were carried out, including a 23-plan, two replicates at the central point and six star points. Low temperatures were found to be favorable for the hydrolysis of xylan and of the easily hydrolyzable glucan fraction. High glucose formation (up to 15.3% of the raw material dry weight), attributable to starch hydrolysis, was detected in the hydrolysates obtained under the least severe pretreatment conditions. Several models were developed for predicting the effect of the operational conditions on the yield of pretreated solids, xylan and glucan conversion upon pretreatment, and on enzymatic convertibility of cellulose. The pretreatment temperature exerted the most significant effect on the conversion of the polysaccharides. Optimum results were predicted for the conversion of easily-hydrolyzable glucan in the material pretreated at 140.7°C, and for the enzymatic saccharification of cellulose in the material pretreated at 169°C. These results are interpreted that a two-step acid hydrolysis may be the best pretreatment strategy for heterogeneous rice hulls produced in small mills.

Dilute sulfuric acid pretreatment of cardoon for ethanol production

2008 ◽  
Vol 42 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Ignacio Ballesteros ◽  
Mercedes Ballesteros ◽  
Paloma Manzanares ◽  
M. José Negro ◽  
J. Miguel Oliva ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Ethanol Production ◽  
Acid Pretreatment ◽  
Dilute Sulfuric Acid ◽  
Dilute Sulfuric Acid Pretreatment ◽  
Sulfuric Acid Pretreatment

scholarly journals Second Generation Biobutanol: An Update

REAKTOR ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 101-110
Author(s):  
Dian Burhani ◽  
Eka Triwahyuni ◽  
Ruby Setiawan
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Cost Effective ◽  
Production Method ◽  
Raw Material ◽  
Food Crops ◽  
Butanol Production ◽  
Clostridium Species ◽  
Food Scarcity ◽  
Absolute Requirement

Butanol, a rising star in biofuel, can be produced by two approaches, petrochemically and biologically. Currently, the most promising route for butanol production is by fermentation using Clostridium species through an anaerobic condition. However, similar to other biofuels, feedstock has greatly influenced the production of biobutanol and the search for inexpensive and abundant raw material is an absolute requirement for a cost-effective process. Second-generation biobutanol which is produced from lignocellulosic biomass of agricultural and forestry waste not only meets the requirement but also alleviates competition with food crops and thereby solves the problems of food scarcity from the first generation biobutanol. This paper delivered the latest and update information regarding biobutanol production specifically second-generation biobutanol in terms of production method, recovery, purification, status, and technoeconomic.  Keyword: biobutanol, lignocellulose, purification, recovery, technoeconomic

scholarly journals Ethanol Production from Waste of Cassava Processing

2018 ◽  
Vol 8 (11) ◽  
pp. 2158 ◽  
Author(s):  
Daiana Martinez ◽  
Armin Feiden ◽  
Reinaldo Bariccatti ◽  
Katya de Freitas Zara
Keyword(s):  
Enzymatic Hydrolysis ◽  
Ethanol Production ◽  
First Generation ◽  
Chemical Compositions ◽  
Energy Matrix ◽  
Average Yield ◽  
Ph Values ◽  
Cassava Bagasse ◽  
High Starch ◽  
By Products

Cassava processing produces by-products such as brown bark, between bark, disposal, bran, fiber and bagasse. Cassava bagasse is characterized as a source of starch that can be converted into sugars to obtain biofuels. The objective of this work was to produce ethanol from this cassava processing residue and to evaluate its contribution potential in the Brazilian energy matrix. Cassava processing residues were obtained from four different starch manufacturers in Brazil. Analysis of the chemical compositions of these samples provided the content of starch, sugar, crude grease, moisture, ash and also their pH values. For the ethanol process, the samples were submitted to enzymatic hydrolysis using the alpha-amylase and amyloglucosidases enzymes, followed by fermentation and distillation. The samples showed high starch indices, approximately 64% on average. The average yield of ethanol obtained was 30% after treatment of the sample like this. Considering the estimated volume of cassava bagasse in Brazil, it is possible to produce an average of 789 million cubic meters per bagasse, replacing about 24% of the first generation ethanol. Cassava bagasse can be considered an interesting biomass for the production of biofuels, contributing to the expansion of the energy matrix.

Effect of acid pretreatment on different parts of corn stalk for second generation ethanol production

2016 ◽  
Vol 206 ◽  
pp. 86-92 ◽  
Author(s):  
Ping Li ◽  
Di Cai ◽  
Zhangfeng Luo ◽  
Peiyong Qin ◽  
Changjing Chen ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Second Generation ◽  
Corn Stalk ◽  
Acid Pretreatment ◽  
Different Parts ◽  
Second Generation Ethanol

ESTIMATIVA DA PRODUÇÃO POTENCIAL DE ETANOL A PARTIR DE DIFERENTES ESPÉCIES DE BRAQUIÁRIAS

2017 ◽  
Vol 32 (2) ◽  
pp. 178
Author(s):  
Itana Neiva Batista ◽  
Flávia Lucila Tonani De Siqueira ◽  
Guilherme Benko De Siqueira ◽  
Walysson Bernardo Rodrigues Santos ◽  
Paulo Ricardo Américo Glória
Keyword(s):  
Ethanol Production ◽  
Second Generation ◽  
Renewable Energy Sources ◽  
Neutral Detergent Fiber ◽  
Raw Material ◽  
Acid Detergent Fiber ◽  
Normality Test ◽  
The Subject ◽  
Interesting Alternative ◽  
Second Generation Ethanol

Alternativas energéticas, por meio de fontes renováveis de energia, tem sido objeto de pesquisas no mundo inteiro. Sendo assim, o material lignocelulósico consiste em uma alternativa interessante de matéria-prima. Diante disso nesse trabalho foi estudada a produção potencial de etanol de quatro espécies de braquiárias. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos (Braquiárias) e quatro repetições. Os dados obtidos foram submetidos ao teste de normalidade Shapiro-Wilk e posteriormente à análise de variância pelo teste F. As médias dos tratamentos e dos seus respectivos desdobramentos foram comparadas pelo teste Scott-Knott a 5% de probabilidade. Foram avaliados os teores de fibra em detergente neutro e ácido, digestibilidade e a estimativa de produção de etanol por estequiometria. Foram observadas diferenças entre as espécies de braquiárias para o potencial de produção de etanol de segunda geração, em função da quantidade de fibra em detergente neutro digestível. As espécies B. decumbens e B. Brizantha cv. Marandu apresentaram menores potenciais de produção de etanol de segunda geração quando comparadas à B. ruziziensis e Convert HD364.Palavras-chave: Digestibilidade, etanol 2G, potencial, hidrólisePOTENTIAL ETHANOL PRODUCTION FROM DIFFERENT BRACHIARIA SPECIES ABSTRACT: Energy alternatives, through renewable energy sources, have been the subject of worldwide researches. Thus, the lignocellulosic material consists of an interesting alternative of raw material. In this work, the potential ethanol production of four Brachiaria species was studied. The experimental design was completely randomized, with four treatments (Brachiaria) and four replications. The data obtained were submitted to the Shapiro-Wilk normality test and later to the analysis of variance by the test F. The means of the treatments and their respective unfolding were compared by the Scott-Knott test at 5% probability. The levels of neutral and acid detergent fiber and digestibility were experimentally assayed and ethanol production was estimated by stoichiometry. Differences were observed between the brachiaria species for the potential of second generation ethanol production, as a function of the amount of digestible neutral detergent fiber. B. decumbens and B. brizantha cv. Marandu presented lower potential of second generation ethanol production when compared to B. ruziziensis and Convert HD364.KEYWORDS: Digestibility, 2G ethanol, potential, hydrolysis.

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