In this study, biodiesel production by using supercritical methyl acetate in a continuous flow reactor was investigated for the first time. The aim of this study was to elucidate the reaction kinetics of biodiesel production by using supercritical methyl. Experiments were conducted at various reaction temperatures (300-400°C), residence times (5-30min), oil-to-methyl acetate molar ratio of 1:40, and a fixed pressure of 20MPa. Reaction kinetics of biodiesel production with supercritical methyl acetate was determined. Finally, biodiesel yield obtained from this method was compared to that obtained with supercritical methanol, ethanol, and MTBE (methyl tertiary-butyl ether). The results showed that biodiesel yield with supercritical methyl acetate increased with temperature and time. The developed kinetic model was found to fit the experimental data well. The reactivity of supercritical methyl acetate was the lowest, followed by that of supercritical MTBE, ethanol, and methanol, under the same conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.biortech.2017.05.210 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Quest for Contrast in Digital Images of Micro/Nano Structured Polymer Blends Before and After CO Foaming: Impact of Block Copolymer Content and Size Upon Acrylic Cellular Structures.
Small
December 2024
UMR CNRS 5629, laboratoire LCPO, Université de Bordeaux, Pessac, F-33600, France.
This work addresses the structural quantification of multiphase materials, here nanostructured polymer solid precursors and their micro/nano sized foamed counterparts. It is based on a strategy of contrast/edge enhancement, locally adaptive to image data in digital images of materials. The method allows to binarize straightforwardly the structures (the phases) in TEM and SEM images after edge identification, edge choice, and image virtual reconstruction.
View Article and Find Full Text PDFScenting: An effective processing technology for enriching key flavor compounds and optimizing flavor quality of decaffeinated tea.
Food Chem
March 2025
Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha 410128, China; National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha 410128, China. Electronic address:
Article Synopsis
- * Supercritical carbon dioxide (SCD) decaffeination reduces the desirable floral and sweet flavors in tea, leading to a less satisfying taste.
- * Scenting DTs with fresh jasmine significantly enhances their aroma and flavor, resulting in a rich jasmine taste that can be achieved by using a full amount of jasmine flowers.
Structure-properties correlations in low-methylated pectin hydrogels and aerogels crosslinked by divalent ions.
Int J Biol Macromol
January 2025
Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, Kemistintie 1, 02150 Espoo, Finland. Electronic address:
In this paper, structure-properties relationship between ionically crosslinked pectin hydrogels and aerogels is drawn, by focusing the study on the small amount of added cationic crosslinkers. Through this strategy and by coupling results from rheology and nanostructure of the gels provided by small-angle X-ray scattering, the early stages of the formation of ionic crosslinking junction zones are observed. Furthermore, as a major predictor of the samples' ability to resist linear shrinkage upon solvent exchange and supercritical drying processes, the gel-state (and thus rheological properties) emerges as a key element.
View Article and Find Full Text PDFAdvantages of dimethyl carbonate as organic modifier for enantioseparation of novel psychoactive substances in sub/supercritical fluid chromatography.
Anal Chim Acta
December 2024
Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 12800, Prague, Czech Republic. Electronic address:
Article Synopsis
- Sub/supercritical fluid chromatography is a greener technique using carbon dioxide, with organic co-solvents like dimethyl carbonate enhancing its effectiveness for separation.
- A study tested dimethyl carbonate as a co-solvent for separating novel psychoactive substances, finding it effective, especially with basic or mixed additives, outperforming traditional co-solvents like methanol.
- Using sustainable co-solvents like dimethyl carbonate reduces the environmental impact of analytical processes, promoting greener chemistry practices.
Synthesis of 3-methyl-3-buten-1-ol by supercritical CO in coordination with HZSM-5-catalyzed formaldehyde-isobutene Prins reaction.
Turk J Chem
June 2024
Department of Chemical Engineering and Technology, School of Chemical Engineering, East China University of Science and Technology, Shanghai, P.R. China.
The reaction solvent and catalyst play essential roles in the Prins reaction for the synthesis of 3-methyl-3-buten-1-ol (MBO) from formaldehyde and isobutene. The reactivity of the solid base-catalyzed Prins condensation reaction by formaldehyde and isobutene in supercritical CO was investigated using CsHPO-modified HZSM-5. We found that the alkaline sites of the alkali-loaded catalyst could extract the α-H on isobutene to generate olefin carbon-negative ions, while the supercritical CO with weak Lewis acidity could activate formaldehyde to carbon-positive ions, which can combine more easily with carbon-negative isobutene to react, thus improving the reactivity of the reaction system.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!