Study on Conditioning of SO2–Ethanol–Water Spent Liquor from Spruce Chips/Softwood Biomass for ABE Fermentation

2013 ◽  
Vol 52 (11) ◽  
pp. 4351-4359 ◽  
Author(s):  
Evangelos Sklavounos ◽  
Mikhail Iakovlev ◽  
Adriaan van Heiningen
Keyword(s):  
Abe Fermentation ◽  
Spent Liquor

Conditioning of SO2-ethanol-water spent liquor from spruce for the production of chemicals by ABE fermentation

Holzforschung ◽  
2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Evangelos Sklavounos ◽  
Mikhail Iakovlev ◽  
Minna Yamamoto ◽  
Lydia Teräsvuori ◽  
German Jurgens ◽  
...  
Keyword(s):  
Forest Biomass ◽  
Mixed Forest ◽  
Abe Fermentation ◽  
Wood Chips ◽  
Spruce Wood ◽  
Spent Liquor ◽  
Acetone Butanol Ethanol

Abstract The objective of this study is to develop a process for conditioning spent liquor produced by SO2-ethanol-water (SEW) fractionation of spruce wood chips for fermentation to butanol, ethanol and acetone/isopropanol, i.e., by means of the so called acetone-butanol-ethanol (ABE) process using Clostridia bacteria. This study serves as part of an overall project aiming at the development of economic processes for producing chemicals and biofuels from mixed forest biomass via SEW fractionation and ABE fermentation technologies.

Ionic liquid‐based in situ product removal ( ISPR ) design exemplified for an ABE fermentation

2021 ◽  
Author(s):  
Yuqiu Chen ◽  
Nipun Garg ◽  
Hao Luo ◽  
Georgios M. Kontogeorgis ◽  
John M. Woodley
Keyword(s):  
Ionic Liquid ◽  
Abe Fermentation ◽  
In Situ Product Removal ◽  
Product Removal

scholarly journals Process Engineering of the Acetone-Ethanol-Butanol (ABE) Fermentation in a Linear and Feedback Loop Cascade of Continuous Stirred Tank Reactors: Experiments, Modeling and Optimization

Fuels ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 108-129
Author(s):  
Katja Karstens ◽  
Sergej Trippel ◽  
Peter Götz
Keyword(s):  
Feedback Loop ◽  
Early Stage ◽  
Formation Rate ◽  
Abe Fermentation ◽  
Operating Conditions ◽  
Stirred Tank ◽  
Second Phase ◽  
Stirred Tank Reactors ◽  
Continuous Stirred Tank ◽  
Continuous Stirred Tank Reactors

The production of butanol, acetone and ethanol by Clostridium acetobutylicum is a biphasic fermentation process. In the first phase the carbohydrate substrate is metabolized to acetic and butyric acid, in the following second phase the product spectrum is shifted towards the economically interesting solvents. Here we present a cascade of six continuous stirred tank reactors (CCSTR), which allows performing the time dependent metabolic phases of an acetone-butanol-ethanol (ABE) batch fermentation in a spatial domain. Experimental data of steady states under four operating conditions—with variations of the pH in the first bioreactor between 4.3 and 5.6 as well as the total dilution rate between 0.042 h−1 and 0.092 h−1—were used to optimize and validate a corresponding mathematical model. Beyond a residence time distribution representation and substrate, biomass and product kinetics this model also includes the differentiation of cells between the metabolic states. Model simulations predict a final product concentration of 8.2 g butanol L−1 and a productivity of 0.75 g butanol L−1 h−1 in the CCSTR operated at pHbr1 of 4.3 and D = 0.092 h−1, while 31% of the cells are differentiated to the solventogenic state. Aiming at an enrichment of solvent-producing cells, a feedback loop was introduced into the cascade, sending cells from a later state of the process (bioreactor 4) back to an early stage of the process (bioreactor 2). In agreement with the experimental observations, the model accurately predicted an increase in butanol formation rate in bioreactor stages 2 and 3, resulting in an overall butanol productivity of 0.76 g L−1 h−1 for the feedback loop cascade. The here presented CCSTR and the validated model will serve to investigate further ABE fermentation strategies for a controlled metabolic switch.

Investigation of acetone-butanol-ethanol (ABE) fermentation by fluorescence

1994 ◽  
Vol 4 (1) ◽  
pp. 3-6
Author(s):  
F. Baut ◽  
M. Fick ◽  
M. L. Viriot ◽  
J. C. André ◽  
M. Donner
Keyword(s):  
Abe Fermentation ◽  
Acetone Butanol Ethanol

Eco-friendly Leather Dyeing using Ultrasound Technique

2020 ◽  
Vol 115 (6) ◽  
pp. 199-205
Author(s):  
Md. Abu Sayid Mia ◽  
Refat E Ashraf ◽  
Mohammad Nurnabi ◽  
Md. Zahnagir Alam
Keyword(s):  
Cross Section ◽  
Fiber Structure ◽  
Dye Uptake ◽  
Scanning Calorimetry ◽  
Mechanical Agitation ◽  
Ultrasound Technique ◽  
Dye Penetration ◽  
Spent Liquor ◽  
And Diffusion ◽  
Sem Analyses

In this study, leather was dyed using ultrasound and conventional methods to investigate the influence of ultrasound on leather dyeing. Ultrasound is more effective than mechanical agitation in enhancing leather dyeing. Effects of various process parameters, such as, dyeing temperature, dyeing time and doses of dye on dyeing of leather in presence of ultrasound were investigated. Dyed leathers were characterized with scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), etc. It was observed that percentage exhaustion of dye, dye uptake, dye penetration and diffusion coefficient were increased significantly in presence of ultrasound compared to those of dyeing in absence of ultrasound. Moreover, physical properties of the dyed leathers were also investigated. Color rub fastness, perspiration, tensile strength, etc. of dyed leather in presence of ultrasound were higher than that of without ultrasound. SEM analyses of the surface and cross section of the dyed leather showed that fiber structure was not affected by ultrasound. Photomicrographic analysis of cross-section of the dyed leather also showed a deeper penetration of dye in presence of ultrasound. Consequently, dye content in the spent liquor was decreased resulting in a lower environmental pollution.

Integrated ABE fermentation–adsorption process for enhanced butanol production by Clostridium acetobutylicum

2018 ◽  
Vol 44 ◽  
pp. S41
Author(s):  
F. Raganati ◽  
A. Procentese ◽  
G. Olivieri ◽  
M.E. Russo ◽  
P. Salatino ◽  
...  
Keyword(s):  
Clostridium Acetobutylicum ◽  
Adsorption Process ◽  
Abe Fermentation ◽  
Butanol Production

Nitric Acid-Potassium Hydroxide Fractionation of Rice Straw: an Integrated Biorefinery Initiative

2021 ◽  
Author(s):  
Md. Mostafizur Rahman ◽  
Nur-Al-Sarah Rafsan ◽  
Jannatun Nayeem ◽  
Mohammad Moniruzzaman ◽  
M. Sarwar Jahan
Keyword(s):  
Nitric Acid ◽  
Rice Straw ◽  
Potassium Hydroxide ◽  
Lignin Content ◽  
Soil Nutrient ◽  
Pulp Yield ◽  
Agricultural Residue ◽  
Low Potassium ◽  
Spent Liquor ◽  
Final Effluent

Abstract Rice straw was fractionated with nitric acid in order to avoid the cooking liquor recovery in pulp production from agricultural residue (rice straw). The rice straw treated with 11.03% nitric acid at 90 ℃ for 3hr yields 53.09% pulp. The nitric acid treated rice straw pulp had high amount of lignin and minerals. However, further treatment of nitric acid pulp with low potassium hydroxide reduced the lignin and ash sufficiently as well as the pulp yield. Pulp yield reduced from 53.09 to 34.27%. The papermaking properties of the nitric acid followed by KOH treated pulp showed better quality than the nitric acid pulp. Nitric acid liquor was used several times. Pulp yield decreased in every step of reusing of the nitric acid spent liquor although residual lignin content increased. The final effluent liquor was rich with potassium, nitrogen and biomass that can be used as soil nutrient for cultivation.

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