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Special Issue "Biorefinery and Biomass Conversion and Utilization"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: 31 January 2019

Special Issue Editor

Guest Editor
Prof. Dr. Christophe Len

PSL Research University, IRCP, UMR 8247 CNRS Chimie ParisTech, 11 rue Pierre et Marie Curie, F-75005 Paris, France
Website | E-Mail
Interests: green chemistry; organic chemistry; catalysis

Special Issue Information

Dear Colleagues,

Due to the severe degradation of oil-based resources, food and water associated with an increasing population, the 21st century (compared to the previous three) is important for society and future generations. In this context, alternative solutions able to mitigate climate change and reduce the consumption of fossil fuels, have to be promoted. Therefore, the replacement of fossil oil by promising renewable resources, such as biomass and waste for the production of fuel and bio-based chemicals, is an interesting option and is the driving force for the development of biorefinery complexes.

The aim of this Special Issue is to cover promising recent research and emerging trends using biomass (lignocellulose, hemicellulose, oil, etc.) and platform molecules (furfural, hydroxymethylfurfural, levulinic acid, glycerol, etc.) in the fields of (i) thermochemical conversion technologies; (ii) physicochemical conversion technologies; and (iii) biochemical conversion technologies. The development of ambitious alternative technologies (flow chemistry, microwave, microreactors, nanocatalysts), as new cornerstones to green chemistry and sustainable development will also be covered.

Prof. Dr. Christophe Len
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access bimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • biomass
  • biorefinery
  • green chemistry
  • thermochemistry
  • physicochemistry
  • biochemistry
  • chemical catalysis
  • alternative technologies
  • microwave
  • sonochemistry
  • continuous flow

Published Papers (3 papers)

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Research

Open AccessArticle Characteristics of the Water- and Alkali-Soluble Hemicelluloses Fractionated by Sequential Acidification and Graded-Ethanol from Sweet Maize Stems
Molecules 2019, 24(1), 212; https://doi.org/10.3390/molecules24010212
Received: 3 December 2018 / Revised: 24 December 2018 / Accepted: 3 January 2019 / Published: 8 January 2019
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Abstract
Sweet maize stems were treated with hot water and potassium hydroxide to fractionate hemicellulosic polymers. The results showed that the water-soluble hemicelluloses were mainly composed of glucose (27.83%), xylose (27.32%), and galactose (16.81%). In comparison, alkali-soluble hemicelluloses fractionated by acidification and a graded
[...] Read more.
Sweet maize stems were treated with hot water and potassium hydroxide to fractionate hemicellulosic polymers. The results showed that the water-soluble hemicelluloses were mainly composed of glucose (27.83%), xylose (27.32%), and galactose (16.81%). In comparison, alkali-soluble hemicelluloses fractionated by acidification and a graded ethanol solution (10%, 20%, 35%, 50%, 65%, and 80%) were mainly composed of xylose (69.73 to 88.62%) and arabinose (5.41 to 16.20%). More highly branched hemicelluloses tended to be precipitated in a higher concentration of ethanol solution, as revealed by the decreasing xylose to arabinose ratio from 16.43 to 4.21. Structural characterizations indicated that alkali-soluble hemicelluloses fractionated from sweet maize stems were mainly arabinoxylans. The results provided fundamental information on hemicelluloses composition and structure and their potential utilization in the fields of biofuels, biochemicals, and biomaterials. Full article
(This article belongs to the Special Issue Biorefinery and Biomass Conversion and Utilization)
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Open AccessArticle Effects of Water Content and Particle Size on Yield and Reactivity of Lignite Chars Derived from Pyrolysis and Gasification
Molecules 2018, 23(10), 2717; https://doi.org/10.3390/molecules23102717
Received: 22 September 2018 / Revised: 13 October 2018 / Accepted: 20 October 2018 / Published: 22 October 2018
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Abstract
Water inside coal particles could potentially enhance the interior char–steam reactions during pyrolysis and gasification. This study aims to examine the effects of water contents on the char conversion during the pyrolysis and gasification of Shengli lignite. The ex-situ reactivities of chars were
[...] Read more.
Water inside coal particles could potentially enhance the interior char–steam reactions during pyrolysis and gasification. This study aims to examine the effects of water contents on the char conversion during the pyrolysis and gasification of Shengli lignite. The ex-situ reactivities of chars were further analyzed by a thermo gravimetric analyzer (TGA). Under the pyrolysis condition, the increase in water contents has monotonically decreased the char yields only when the coal particles were small (<75 µm). In contrast, the water in only large coal particles (0.9–2.0 mm) has clearly favored the increase in char conversion during the gasification condition where 50% steam in argon was used as external reaction atmosphere. The waved reactivity curves for the subsequent char–air reactions were resulted from the nature of heterogeneity of char structure. Compared to the large particles, the less interior char–steam reactions for the small particles have created more differential char structure which showed two different stages when reacting with air at the low temperature in TGA. Full article
(This article belongs to the Special Issue Biorefinery and Biomass Conversion and Utilization)
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Open AccessFeature PaperArticle Biodetoxification of Phenolic Inhibitors from Lignocellulose Pretreatment using Kurthia huakuii LAM0618T and Subsequent Lactic Acid Fermentation
Molecules 2018, 23(10), 2626; https://doi.org/10.3390/molecules23102626
Received: 23 August 2018 / Revised: 21 September 2018 / Accepted: 28 September 2018 / Published: 12 October 2018
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Abstract
Phenolic inhibitors generated during alkaline pretreatment of lignocellulosic biomasses significantly hinder bacterial growth and subsequent biofuel and biochemical production. Water rinsing is an efficient method for removing these compounds. Nevertheless, this method often generates a great amount of wastewater, and leads to the
[...] Read more.
Phenolic inhibitors generated during alkaline pretreatment of lignocellulosic biomasses significantly hinder bacterial growth and subsequent biofuel and biochemical production. Water rinsing is an efficient method for removing these compounds. Nevertheless, this method often generates a great amount of wastewater, and leads to the loss of solid fiber particles and fermentable sugars. Kurthia huakuii LAM0618T, a recently identified microorganism, was herein shown to be able to efficiently transform phenolic compounds (syringaldehyde, hydroxybenzaldehyde, and vanillin) into less toxic acids. Taking advantage of these properties, a biodetoxification method was established by inoculating K. huakuii LAM0618T into the NH3/H2O2-pretreated unwashed corn stover to degrade phenolic inhibitors and weak acids generated during the pretreatment. Subsequently, 33.47 and 17.91 g/L lactic acid was produced by Bacillus coagulans LA204 at 50 °C through simultaneous saccharification and fermentation (SSF) from 8% (w/w) of NH3/H2O2-pretreated corn stover with or without K. huakuii LAM0618T-biodetoxification, indicating biodetoxification significantly increased lactic acid titer and yield. Importantly, using 15% (w/w) of the NH3/H2O2-pretreated K. huakuii LAM0618T-biodetoxified corn stover as a substrate through fed-batch simultaneous saccharification and fermentation, high titer and high yield of lactic acid (84.49 g/L and 0.56 g/g corn stover, respectively, with a productivity of 0.88 g/L/h) were produced by Bacillus coagulans LA204. Therefore, this study reported the first study on biodetoxification of alkaline-pretreated lignocellulosic material, and this biodetoxification method could replace water rinsing for removal of phenolic inhibitors and applied in biofuel and biochemical production using the alkaline-pretreated lignocellulosic bioresources. Full article
(This article belongs to the Special Issue Biorefinery and Biomass Conversion and Utilization)
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