Simulation of acid hydrolysis of lignocellulosic residues to fermentable sugars for bioethanol production

2012 ◽  
Author(s):  
Dimitris Sidiras
Keyword(s):  
Acid Hydrolysis ◽  
Fermentable Sugars ◽  
Bioethanol Production ◽  
Lignocellulosic Residues ◽  
Hydrolysis Of

scholarly journals Optimized acid hydrolysis of the polysaccharides from the seaweed Solieria filiformis (Kützing) P.W. Gabrielson for bioethanol production

2017 ◽  
Vol 39 (4) ◽  
pp. 423 ◽  
Author(s):  
George Meredite Cunha de Castro ◽  
Norma Maria Barros Benevides ◽  
Maulori Curié Cabral ◽  
Rafael De Souza Miranda ◽  
Enéas Gomes Filho ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Kinetic Parameters ◽  
Renewable Resource ◽  
Bioethanol Production ◽  
Seaweed Species ◽  
Mild Conditions ◽  
Hydrolysis Of ◽  
Solieria Filiformis

 The seaweeds are bio-resource rich in sulfated and neutral polysaccharides. The tropical seaweed species used in this study (Solieria filiformis), after dried, shows 65.8% (w/w) carbohydrate, 9.6% (w/w) protein, 1.7% (w/w) lipid, 7.0% (w/w) moisture and 15.9% (w/w) ash. The dried seaweed was easily hydrolyzed under mild conditions (0.5 M sulfuric acid, 20 min.), generating fermentable monosaccharides with a maximum hydrolysis efficiency of 63.21%. Galactose and glucose present in the hydrolyzed were simultaneously fermented by Saccharomyces cerevisiae when the yeast was acclimated to galactose and cultivated in broth containing only galactose. The kinetic parameters of the fermentation of the seaweed hydrolyzed were Y(P⁄S) = 0.48 ± 0.02 g.g−1, PP = 0.27 ± 0.04 g.L−1.h−1, h = 94.1%, representing a 41% increase in bioethanol productivity. Therefore, S. filiformis was a promising renewable resource of polysaccharides easily hydrolyzed, generating a broth rich in fermentable monosaccharides for ethanol production. 

The acid hydrolysis of potato tuber mash in bioethanol production

2009 ◽  
Vol 43 (2) ◽  
pp. 208-211 ◽  
Author(s):  
Marija B. Tasić ◽  
Budimir V. Konstantinović ◽  
Miodrag L. Lazić ◽  
Vlada B. Veljković
Keyword(s):  
Potato Tuber ◽  
Acid Hydrolysis ◽  
Bioethanol Production ◽  
Hydrolysis Of

scholarly journals Dilute-Acid Hydrolysis of Apple, Orange, Apricot and Peach Pomaces as Potential Candidates for Bioethanol Production

2013 ◽  
Vol 7 (3) ◽  
pp. 376-389 ◽  
Author(s):  
Can Ucuncu ◽  
Canan Tari ◽  
Hande Demir ◽  
Ali Oguz Buyukkileci ◽  
Banu Ozen
Keyword(s):  
Acid Hydrolysis ◽  
Bioethanol Production ◽  
Dilute Acid ◽  
Dilute Acid Hydrolysis ◽  
Hydrolysis Of

scholarly journals Bioethanol production from lignocellulosic sugarcane leaves and tops

2017 ◽  
Vol 28 (3) ◽  
pp. 1 ◽  
Author(s):  
Charlie Marembu Dodo ◽  
Samphson Mamphweli ◽  
Omobola Okoh
Keyword(s):  
Acid Hydrolysis ◽  
Sodium Hydroxide ◽  
Cost Effective ◽  
Enzyme Hydrolysis ◽  
Fermentable Sugars ◽  
Bioethanol Production ◽  
Dilute Acid ◽  
Dilute Acid Hydrolysis ◽  
Pre Treatment ◽  
Biological Methods

Bioethanol production is one of the most promising possible substitutes for fossil-based fuels, but there is a need to make available cost-effective methods of production if it is to be successful. Various methods for the production of bioethanol using different feedstocks have been explored. Bioethanol synthesis from sugarcane, their tops and leaves have generally been regarded as waste and discarded. This investigation examined the use of lignocellulosic sugarcane leaves and tops as biomass and evaluated their hydrolysate content. The leaves and tops were hydrolysed using concentrated and dilute sulphuric acid and compared with a combination of oxidative alkali-peroxide pre-treatment with enzyme hydrolysis using the enzyme cellulysin® cellulase. Subsequent fermentation of the hydrolysates into bioethanol was done using the yeast saccharomyces cerevisae. The problem of acid hydrolysis to produce inhibitors was eliminated by overliming using calcium hydroxide and this treatment was subsequently compared with sodium hydroxide neutralisation. It was found that oxidative alkali pre-treatment with enzyme hydrolysis gave the highest yield of fermentable sugars of 38% (g/g) for 7% (v/v) peroxide pretreated biomass than 36% (g/g) for 5% (v/v) with the least inhibitors. Concentrated and dilute acid hydrolysis each gave yields of 25% (g/g) and 22% (g/g) respectively, although the acid required a neutralisation step, resulting in dilution. Alkaline neutralisation of acid hydrolysates using sodium hydroxide resulted in less dilution and loss of fermentable sugars, compared with overliming. Higher yields of bioethanol of 13.7 g/l were obtained from enzyme hydrolysates than the 6.9 g/l ethanol from dilute acid hydrolysates. There was more bioethanol yield of 13.7 g/l after 72 hours of fermentation with the yeast than the 7.0 g/l bioethanol after 24 hours.This research showed that it is possible to use sugarcane waste material to supplement biofuel requirements and that combining the chemical and biological methods of pretreatments can give higher yields at a faster rate.

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