Preparing bioethanol from oat hulls pretreated with a dilute nitric acid: Scaling of the production process on a pilot plant

Baibakova, O. V.; Скиба, Е. А.; Будаева, В. В.; Сакович, Г. В.

doi:10.1134/s2070050417030023

Cited by 5 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1a and Table S2 illustrate the chemical compositions of pulps p1 and p2 obtained under pilot-scale conditions from 2% NaOHpretreated-o.h. 17 and 4% HNO 3 -pretreated-o.h., 33 respectively. The cellulose loss for p2 after the HNO 3 -pretreatment was 36%-w, which is ∼1.5% higher than that for p1 after the NaOH-delignification.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…The resulting pulps were subjected to dSSF under a wet condition. The dSSF step took 72 h: after 24 h pre-saccharification, the enzymatic hydrolysis and fermentation were run simultaneously for 48 h. , Bioethanol produced from o.h. in a pilot plant ( r1 and r2 ) was further subjected to dewatering (#3.1) to obtain biodistillates d1 and d2 .…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Previously, we described our pilot-scale methods for o.h.-to-bioethanol production. 17,33 The methods differed in pretreatment with either NaOH 17 or HNO 3 ; 33 the other stages (enzymatic saccharification, fermentation, and purification) were identical (Table 1).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability

Овчинникова

Mironova

Банзаракцаева

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Agricultural wastes are cost-effective, renewable, and abundant. Using bioethanol from oat hulls (o.h.) could be a promising technology to produce ethylene and valuable derivatives. This process follows the Principles of Green Chemistry, albeit facing certain challenges. We compared pretreatment options with either 4%-HNO 3 or 2%-NaOH for the complete recycling of o.h. to ethylene and coproducts. On a pilot-scale, 10 kg of o.h. was converted to 1.10−0.95 kg of bioethanol (93%-w); on a lab scale, bioethanol was converted to 0.55−0.39 kg of ethylene; under optimum pilot-scale conditions, this would be equivalent to ∼0.67−0.55 kg of ethylene. NaOH-delignification results in ∼20% loss in ethylene productivity. Residual Na ions in the pulp cause inhibition of both fermentation to ethanol and alumina-catalyzed dehydration to ethylene. HNO 3 -pretreatment excludes Na and reduces the content of fusel alcohols and acetaldehyde in bioethanol 10-fold. Compared to NaOH-delignification, HNO 3 -pretreatment gives ∼13 times more coproduct and ∼1.6 times less waste, which makes the o.h.-to-ethylene technology more sustainable and green. E-factor (wastes/products) is 1.5 and W-factor (water/products) is 1.8 if the pulp-washing step is considered. Both factors can be greatly improved by eliminating this step. The estimated production of ethylene from the local o.h. in Siberia is 43 KTPA (or 71 KTPA-ethanol).

show abstract

Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Experimental Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability

Овчинникова

Mironova

Банзаракцаева

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Oat straw and husks were investigated for the production of biogas [10], xylanase [11], xylitol [12], ethanol [12,13], bacterial cellulose [14][15][16], hydrogels [17], and polypropylene composites [18]. The pretreatment strategies to overcome lignocellulosic recalcitrance mostly included dilute-acid pretreatment using sulfuric acid [11,19] and nitric acid [13,[20][21][22][23], which exhibited the highest impact on dissolution of hemicellulose, and dilute-alkali pretreatment using sodium hydroxide [17,24] and ammonium hydroxide [25], which showed the highest impact on delignification. The use of concentrated salts solutions such as sodium benzoate [26] were also investigated for delignification.…”

Section: Introductionmentioning

confidence: 99%

Biorefining Oat Husks into High-Quality Lignin and Enzymatically Digestible Cellulose with Acid-Catalyzed Ethanol Organosolv Pretreatment

2020

View full text Add to dashboard Cite

Oat husks are low-value lignocellulosic residues of oat processing that carry an environmental impact. Their polymers (cellulose, hemicellulose, and lignin) can be converted into a wide variety of value-added products; however, efficient pretreatment methods are needed that allow their fine separation for further tailored valorization. This study pioneered the use of milling-free and low acid-catalyzed ethanol organosolv for the delignification of oat husks, allowing their conversion into three high-quality streams, namely, glucan-rich, lignin-rich, and hemicellulosic compound-rich streams. Temperature, retention time, and solid-to-liquid ratio were found to impact the delignification of oat husks when using a one-factor-at-a-time strategy. The ideal conditions that were found (210 °C, 90 min, and solid-to-liquid ratio of 1:2) culminated into glucan and lignin fractions containing 74.5% ± 11.4% glucan and 74.9% ± 7.6% lignin, respectively. These high-purity lignin fractions open the possibility for higher value applications by lignin, potentially impacting the feasibility of second generation biorefineries. The glucan fraction showed 90% digestibility after 48 h of hydrolysis with 10 filter paper units of enzyme cocktail per gram of glucan. Considering the absence of size reduction and high solid loading, together with the quality of the obtained streams, organosolv pretreatment could be a potential strategy for the valorization of oat lignocellulosic residues.

show abstract

Scaling up the Mechanochemical Technology for Producing Materials Enriched in Humic Acids

Skripkina

Бычков

Rozhanskaya

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Mechanochemical treatment is widely used in industry as it allows one to reduce the number of processing stages, either reduce or completely eliminate the use of solvents, automate the technology and ensure its mobility. Energy input is an important parameter of mechanochemical treatment. In this study, the technology of mechanochemical oxidation of brown coal was scaled up using the planetary mills of AGO-2 and APF types, as well as K-7 and CEM-20 flow-type vibrocentrifugal mills. The technology of mechanochemical oxidation of brown coal makes it possible to increase the availability of humic acids in brown coal and the content of oxygen-bearing groups capable of complexation, as well as to improve sorption characteristics of the resulting product. Materials enriched in humic acids can be used as heavy metal sorbents in water bodies and as agents for soil amelioration. The rotor speed of 1400 rpm and the feed rates of 15 kg/h and 1.8 kg/h for CEM-20 and for K-7 vibrocentrifugal mills, respectively, are the optimal modes from the point of view of chemical and economic efficiency. These modes increase the yields of alkali-soluble and water-soluble humic acids from 23 to 59 % and from <1 to 7%, respectively, which corresponds to the values reached using the laboratory-scale equipment.

show abstract

Preparing bioethanol from oat hulls pretreated with a dilute nitric acid: Scaling of the production process on a pilot plant

Cited by 5 publications

References 22 publications

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability

Biorefining Oat Husks into High-Quality Lignin and Enzymatically Digestible Cellulose with Acid-Catalyzed Ethanol Organosolv Pretreatment

Scaling up the Mechanochemical Technology for Producing Materials Enriched in Humic Acids

Contact Info

Product

Resources

About

Preparing bioethanol from oat hulls pretreated with a dilute nitric acid: Scaling of the production process on a pilot plant

Cited by 5 publications

References 22 publications

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO3- or NaOH-Pretreatment on Process Efficiency and Sustainability

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO3- or NaOH-Pretreatment on Process Efficiency and Sustainability

Biorefining Oat Husks into High-Quality Lignin and Enzymatically Digestible Cellulose with Acid-Catalyzed Ethanol Organosolv Pretreatment

Scaling up the Mechanochemical Technology for Producing Materials Enriched in Humic Acids

Contact Info

Product

Resources

About

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability

Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO₃- or NaOH-Pretreatment on Process Efficiency and Sustainability