Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO3- or NaOH-pretreatment on Process Efficiency and Sustainability Full article
| Journal |
ACS Sustainable Chemistry & Engineering
ISSN: 2168-0485 |
||||
|---|---|---|---|---|---|
| Output data | Year: 2021, Volume: 9, Number: 49, Pages: 16588–16596 Pages count : 9 DOI: 10.1021/acssuschemeng.1c05112 | ||||
| Tags | oat-hulls, pretreatment, bioethanol-to-ethylene dehydration, impurities, material balance, sustainability metrics, E-factor | ||||
| Authors |
|
||||
| Affiliations |
|
Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0014 |
| 2 | Ministry of Science and Higher Education of the Russian Federation | FUFE-2021-0007 (121061500030-3) |
Abstract:
Agricultural wastes are cost-effective, renewable and abundant. 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%-HNO3 or 2%-NaOH for the complete recycling of o.h. to ethylene and coproducts. On a pilot-scale, 10 kg-o.h. was converted to 1.10–0.95 kg-bioethanol (93%-w); on a lab scale, the bioethanol was converted to 0.55–0.39 kg-ethylene; under optimum pilot-scale conditions, this would be equivalent to ~0.67–0.55 kg-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. HNO3-pretreatment excludes Na and reduces the content of fusel alcohols and acetaldehyde in bioethanol tenfold. Compared to NaOH-delignification, HNO3-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 taken into account. Both factors may be significantly improved by excluding pulp-washing. The estimated production of ethylene from the local o.h. in Siberia is 43 KTPA (or 71 KTPA-ethanol).
Cite:
Ovchinnikova E.V.
, Mironova G.F.
, Banzaraktsaeva S.P.
, Skiba E.A.
, Budaeva V.V.
, Kovgan M.A.
, Chumachenko V.A.
Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO3- or NaOH-pretreatment on Process Efficiency and Sustainability
ACS Sustainable Chemistry & Engineering. 2021. V.9. N49. P.16588–16596. DOI: 10.1021/acssuschemeng.1c05112 WOS Scopus РИНЦ AN OpenAlex
Bioprocessing of Oat Hulls to Ethylene: Impact of Dilute HNO3- or NaOH-pretreatment on Process Efficiency and Sustainability
ACS Sustainable Chemistry & Engineering. 2021. V.9. N49. P.16588–16596. DOI: 10.1021/acssuschemeng.1c05112 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Jul 28, 2021 |
| Accepted: | Nov 11, 2021 |
| Published online: | Nov 26, 2021 |
| Published print: | Dec 13, 2021 |
Identifiers:
| Web of science: | WOS:000753961000007 |
| Scopus: | 2-s2.0-85120655469 |
| Elibrary: | 47536593 |
| Chemical Abstracts: | 2021:2565753 |
| OpenAlex: | W3216665814 |