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You searched for: Subject acetates Remove constraint Subject: acetates Subject term acetone Remove constraint Subject term: acetone Subject term acetic acid Remove constraint Subject term: acetic acid
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1. La‐ H‐zeolites: efficient catalysts for acetic acid ketonic decarboxylation and esterification

Author:
Gheorghiţa Mitran; Shaojiang Chen; Wenyu Huang; Dong‐Kyun Seo
Source:
Journal of chemical technology and biotechnology 2021 v.96 no.7 pp. 2022-2032
ISSN:
0268-2575
Subject:
Fourier transform infrared spectroscopy; Lewis acids; acetates; acetic acid; acetone; acidity; adsorption; ammonium; biotechnology; decarboxylation; drugs; esterification; ion exchange; land evaluation; lanthanum; pyridines; zeolites
Abstract:
... BACKGROUND: Cyclohexyl acetate and acetone are used as environmentally friendly solvents, while isobutene acts as an intermediate in the production of methacrolein, ethers, plastics and pharmaceuticals. Two La‐zeolite catalysts have been studied for converting acetic acid to cyclohexyl acetate, acetone and isobutene. RESULTS: La‐based zeolites were synthesized from Na‐nFAU zeolites by ammonium ion ...
DOI:
10.1002/jctb.6732

2. Species-Specific Induction of Plant Volatiles by Two Aphid Species in Apple: Real Time Measurement of Plant Emission and Attraction of Lacewings in the Wind Tunnel

Author:
Zaid Badra; Sebastian Larsson Herrera; Luca Cappellin; Franco Biasioli; Teun Dekker; Sergio Angeli; Marco Tasin
Source:
Journal of chemical ecology 2021 v.47 no.7 pp. 653-663
ISSN:
0098-0331
Subject:
Aphis pomi; Chrysoperla carnea; Dysaphis plantaginea; acetates; acetic acid; acetone; apples; benzaldehyde; butyrates; chemical ecology; linalool; methyl salicylate; odors; pests; phenylethyl alcohol; volatile compounds; wind tunnels
Abstract:
... Upon damage by herbivores, plants release herbivory-induced plant volatiles (HIPVs). To find their prey, the pest’s natural enemies need to be fine-tuned to the composition of these volatiles. Whereas standard methods can be used in the identification and quantitation of HIPVs, more recently introduced techniques such as PTR-ToF–MS provide temporal patterns of the volatile release and detect addit ...
DOI:
10.1007/s10886-021-01288-5

3. Table olive polyphenols: A simultaneous determination by liquid chromatography–mass spectrometry

Author:
Rocío Moreno-González; M. Emília Juan; Joana M. Planas
Source:
Journal of chromatography 2020 v.1609 pp. 460434
ISSN:
0021-9673
Subject:
European Union; acetates; acetic acid; acetone; acetonitrile; apigenin; bioactive compounds; caffeic acid; catechol; chronic diseases; electrospray ionization mass spectrometry; functional foods; health claims; liquid chromatography; luteolin; oleuropein; olive oil; olives; p-coumaric acid; polyphenols; protective effect; quercetin; rutin; vanillic acid; verbascoside
Abstract:
... Table olives contain a wide range of polyphenols responsible for protective effects on health that have been associated with a lower prevalence of chronic diseases. A new method to identify and quantify these compounds in table olives, by means of methanol:ethanol (1:1; v/v) extraction followed by LC-ESI-MS/MS, has been developed and validated. The chromatographic column Eclipse-XDB-C18, never use ...
DOI:
10.1016/j.chroma.2019.460434

4. Active Site Ensembles Enabled C–C Coupling of CO2 and CH4 for Acetone Production

Author:
Yuntao Zhao; Hua Wang; Jinyu Han; Xinli Zhu; Qingfeng Ge
Source:
Journal of physical chemistry 2018 v.122 no.17 pp. 9570-9577
ISSN:
1932-7455
Subject:
Lewis bases; acetates; acetic acid; acetone; activation energy; active sites; carbon; carbon dioxide; catalysts; density functional theory; energy; methane; moieties; oxygen; production technology; zinc
Abstract:
... The production of acetone through ketonization of acetic acid is both energy intensive and environmentally detrimental, as it emits equimolecular CO₂. Herein, a novel approach for acetone production from CO₂ and CH₄ was proposed through consecutive C–C coupling based on an extensive density functional theory computational study. To realize the consecutive C–C coupling, CeO₂-based catalyst doped wi ...
DOI:
10.1021/acs.jpcc.8b02359

5. Monitoring of selected skin- and breath-borne volatile organic compounds emitted from the human body using gas chromatography ion mobility spectrometry (GC-IMS)

Author:
Paweł Mochalski; Helmut Wiesenhofer; Maria Allers; Stefan Zimmermann; Andreas T. Güntner; Nicolay J. Pineau; Wolfgang Lederer; Agapios Agapiou; Christopher A. Mayhew; Veronika Ruzsanyi
Source:
Journal of chromatography 2018 v.1076 pp. 29-34
ISSN:
1570-0232
Subject:
European Union; acetates; acetic acid; acetone; acrolein; alcohols; benzaldehyde; butyrates; chemical analysis; containers; crime; detection limit; formates; gas chromatography; humans; moieties; monitoring; people; propionic acid; shipping; spectrometers; spectroscopy; statistical analysis; trucks; volatile organic compounds
Abstract:
... Human smuggling and associated cross-border crimes have evolved as a major challenge for the European Union in recent years. Of particular concern is the increasing trend of smuggling migrants hidden inside shipping containers or trucks. Therefore, there is a growing demand for portable security devices for the non-intrusive and rapid monitoring of containers to detect people hiding inside. In thi ...
DOI:
10.1016/j.jchromb.2018.01.013

6. Comparative Kinetic Monte Carlo Study of Acetic Acid Decomposition to Surface Carbon Species and Undesirable Byproducts on Pd(100) and Pd/Au(100) from Density Functional Theory-Based Calculations

Author:
Huang Yanping; Dong Xiuqin; Yu Yingzhe; Zhang Minhua
Source:
The Journal of Physical Chemistry C 2017 v.121 no.48 pp. 26733-26741
ISSN:
1932-7455
Subject:
Monte Carlo method; acetaldehyde; acetates; acetic acid; acetone; adsorption; byproducts; carbon; carbon dioxide; catalysts; decarboxylation; ethylene; gold; hydrogen; methane; methanol; methodology; palladium; vinyl acetate
Abstract:
... Acetic acid decomposition on Pd(100) and Pd/Au(100) during vinyl acetate (VA) synthesis from ethylene acetoxylation is the primary source of such undesirable byproducts as methanol (CH₃OH), acetaldehyde (CH₃CHO), ketene (CH₂CO), acetone (CH₃COCH₃), and methane (CH₄), and also one possible source of surface carbon formation, which will lead to the deactivation of the catalyst. In this work, density ...
DOI:
10.1021/acs.jpcc.7b05072

7. Value-additive utilization of agro-biomass: preparation of cellulose triacetate directly from rice straw as well as other cellulosic materials

Author:
Amita Sharma; Santosh Kumar Giri; K. P. Ravindranathan Kartha; Rajender S. Sangwan
Source:
RSC advances 2017 v.7 no.21 pp. 12745-12752
ISSN:
2046-2069
Subject:
acetates; organochlorine compounds; filtration; sulfonic acids; value added; acetone; pyridines; cellulose; cellulosic materials; silica; toxic substances; rice straw; biomass; cotton; neutralization; acetic acid; aromatic compounds; acetic anhydride; catalysts; methane; acetylation; biofuels; coproducts
Abstract:
... Non-forage crop residues like rice straw are among the most important and pertinent renewable biomass available for utilization for producing biofuels, specialty chemicals, aromatics etc. Recovery of cellulose from them and its processing for products are two key steps of value addition to these materials that are available in abundance. Of these, rice straw is perhaps the most recalcitrant of all ...
DOI:
10.1039/c7ra00078b

8. An experimental and numerical model for the release of acetone from decomposing EVA containing aluminium, magnesium or calcium hydroxide fire retardants

Author:
Fiona Hewitt; Diana Eid Rhebat; Artur Witkowski; T. Richard Hull
Source:
Polymer degradation and stability 2016 v.127 pp. 65-78
ISSN:
0141-3910
Subject:
acetates; acetic acid; acetone; calcium hydroxide; flame retardants; kinetics; magnesium hydroxide; mathematical models; polymers; pyrolysis
Abstract:
... Recent studies have identified acetone as an unexpected pyrolysis product of EVA containing aluminium or magnesium hydroxide fire retardants. It is thought that the freshly formed, open-pored, metal oxide, a thermal decomposition product of the metal hydroxide, traps acetic acid released from EVA and catalyses its conversion to acetone. Such a ketonisation reaction is well-established but the inte ...
DOI:
10.1016/j.polymdegradstab.2016.01.007

9. Optimization of Solketalacetin Synthesis as a Green Fuel Additive from Ketalization of Monoacetin with Acetone

Author:
Gorji Yadollah M.; Ghaziaskar Hassan S.
Source:
Industrial & Engineering Chemistry Research 2016 v.55 no.25 pp. 6904-6910
ISSN:
1520-5045
Subject:
acetates; acetic acid; acetone; catalysts; chemistry; engineering; experimental design; fuels; glycerol; response surface methodology; temperature
Abstract:
... An economical and easy to scale up method for glycerol conversion to solketalacetin (i.e., (2,2-dimethyl-1,3-dioxolan-4-yl)methyl acetate) as a valuable fuel additive is described, for the first time. Monoacetin was synthesized by reacting glycerol with acetic acid, and then solketalacetin was produced from the reaction of monoacetin with acetone using Purolite PD 206 as a catalyst. The central co ...
DOI:
10.1021/acs.iecr.6b00929

10. Anaerobic detoxification of acetic acid in a thermophilic ethanologen

Author:
A Joe Shaw; Bethany B Miller; Stephen R Rogers; William R Kenealy; Alex Meola; Ashwini Bhandiwad; W Ryan Sillers; Indraneel Shikhare; David A Hogsett; Christopher D Herring
Source:
Biotechnology for biofuels 2015 v.8 no.1 pp. 75
ISSN:
1754-6834
Subject:
Thermoanaerobacterium saccharolyticum; acetate kinase; acetates; acetic acid; acetone; acetyl coenzyme A; bacteria; biochemical pathways; biomass; carbon; ethanol; fermentation; ferredoxin hydrogenase; genes; hemicellulose; mutation; phenotype; toxicity
Abstract:
... BACKGROUND: The liberation of acetate from hemicellulose negatively impacts fermentations of cellulosic biomass, limiting the concentrations of substrate that can be effectively processed. Solvent-producing bacteria have the capacity to convert acetate to the less toxic product acetone, but to the best of our knowledge, this trait has not been transferred to an organism that produces ethanol at hi ...
DOI:
10.1186/s13068-015-0257-4
PubMed:
27279899
PubMed Central:
PMC4898469

11. Thermodynamic analysis and reaction routes of steam reforming of bio-oil aqueous fraction

Author:
K.A. Resende; C.N. Ávila-Neto; R.C. Rabelo-Neto; F.B. Noronha; C.E. Hori
Source:
Renewable energy 2015 v.80 pp. 166-176
ISSN:
0960-1481
Subject:
acetates; acetic acid; acetone; biofuels; desorption; hydrogen; models; steam; temperature; thermodynamics
Abstract:
... Steam reforming of the bio-oil aqueous fraction is a potential process to produce hydrogen. Therefore, to perform a thermodynamic study of this process can be interesting to determine the most favorable operating conditions. The calculations were made using a model compound and an aqueous fraction of a specific bio-oil. The data were obtained at different temperatures and for different steam(S)/fu ...
DOI:
10.1016/j.renene.2015.01.057

12. Medium optimization and proteome analysis of (R,R)-2,3-butanediol production by Paenibacillus polymyxa ATCC 12321

Author:
Jinshan Li; Wei Wang; Yanhe Ma; An-Ping Zeng
Source:
Applied microbiology and biotechnology 2013 v.97 no.2 pp. 585-597
ISSN:
0175-7598
Subject:
Paenibacillus polymyxa; acetates; acetic acid; acetone; biosynthesis; carbon; fermentation; methionine; proteins; proteome; stress response; yeast extract
Abstract:
... Paenibacillus polymyxa can produce the (R,R)-stereoisomer of 2,3-butanediol (2,3-BDL) which is industrially very useful. Two important factors affecting (R,R)-BDL production by P. polymyxa ATCC 12321, medium composition, and addition of acetic acid to the culture were investigated in this study with accompanying comparative proteomic analysis. For this purpose, a simple control strategy of O₂ supp ...
DOI:
10.1007/s00253-012-4331-6
PubMed:
22865001

13. Potential of bioethanol as a chemical building block for biorefineries: Preliminary sustainability assessment of 12 bioethanol-based products

Author:
John A. Posada; Akshay D. Patel; Alexander Roes; Kornelis Blok; André P.C. Faaij; Martin K. Patel
Source:
Bioresource technology 2013 v.135 pp. 490-499
ISSN:
0960-8524
Subject:
acetone; propylene; economic indicators; acetic acid; acetates; ethylene; ethylene oxide; bioethanol; petrochemicals; hydrogen
Abstract:
... The aim of this study is to present and apply a quick screening method and to identify the most promising bioethanol derivatives using an early-stage sustainability assessment method that compares a bioethanol-based conversion route to its respective petrochemical counterpart. The method combines, by means of a multi-criteria approach, quantitative and qualitative proxy indicators describing econo ...
DOI:
10.1016/j.biortech.2012.09.058
PubMed:
23069604

14. Disruption of the acetate kinase (ack) gene of Clostridium acetobutylicum results in delayed acetate production

Author:
Wouter Kuit; Nigel P. Minton; Ana M. López-Contreras; Gerrit Eggink
Source:
Applied microbiology and biotechnology 2012 v.94 no.3 pp. 729-741
ISSN:
0175-7598
Subject:
Clostridium acetobutylicum; acetate kinase; acetates; acetic acid; acetoin; acetone; adenosine diphosphate; adenosine triphosphate; butanol; butyrates; catalytic activity; ethanol; fermentation; genes; iron; lactates; magnesium; microorganisms; mutants; phosphates; solvents
Abstract:
... In microorganisms, the enzyme acetate kinase (AK) catalyses the formation of ATP from ADP by de-phosphorylation of acetyl phosphate into acetic acid. A mutant strain of Clostridium acetobutylicum lacking acetate kinase activity is expected to have reduced acetate and acetone production compared to the wild type. In this work, a C. acetobutylicum mutant strain with a selectively disrupted ack gene, ...
DOI:
10.1007/s00253-011-3848-4
PubMed:
22249720
PubMed Central:
PMC3315644

15. Green leaf volatiles and oxygenated metabolite emission bursts from mesquite branches following light–dark transitions

Author:
K. Jardine; G. A. Barron-Gafford; J. P. Norman; L. Abrell; R. K. Monson; K. T. Meyers; M. Pavao-Zuckerman; K. Dontsova; E. Kleist; C. Werner; T. E. Huxman
Source:
Photosynthesis research 2012 v.113 no.1-3 pp. 321-333
ISSN:
0166-8595
Subject:
acetaldehyde; acetates; acetic acid; acetone; acetyl coenzyme A; branches; ethanol; fatty acid metabolism; leaves; metabolites; photophase; photosynthesis; stress response
Abstract:
... Green leaf volatiles (GLVs) are a diverse group of fatty acid-derived compounds emitted by all plants and are involved in a wide variety of developmental and stress-related biological functions. Recently, GLV emission bursts from leaves were reported following light–dark transitions and hypothesized to be related to the stress response while acetaldehyde bursts were hypothesized to be due to the ‘ ...
DOI:
10.1007/s11120-012-9746-5
PubMed:
22711426

16. EVA-layered double hydroxide (nano)composites: Mechanism of fire retardancy

Author:
Xiaolan Wang; Rajendra Rathore; Ponusa Songtipya; Maria del Mar Jimenez-Gasco; Evangelos Manias; Charles A. Wilkie
Source:
Polymer degradation and stability 2011 v.96 no.3 pp. 301-313
ISSN:
0141-3910
Subject:
X-ray diffraction; acetates; acetic acid; acetone; calorimetry; composite polymers; dispersions; flame retardants; heat; hydrogen; magnesium; magnesium hydroxide; mass spectrometry; melting; nanocomposites; polyethylene; polyvinyl acetate; thermal degradation; thermogravimetry; transmission electron microscopy; zinc
Abstract:
... Composites of ethylene–vinyl acetate copolymer with two different layered double hydroxides have been obtained by melt blending and these have been characterized by X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, thermogravimetric analysis connected to mass spectroscopy and cone calorimetry. There is some small difference in dispersion between the zinc-containing a ...
DOI:
10.1016/j.polymdegradstab.2010.03.014

17. Feasibility Study on Chemometric Discrimination of Roasted Arabica Coffees by Solvent Extraction and Fourier Transform Infrared Spectroscopy

Author:
Wang, Niya; Fu, Yucheng; Lim, Loong-Tak
Source:
Journal of agricultural and food chemistry 2011 v.59 no.7 pp. 3220–3226
ISSN:
0021-8561
Subject:
Fourier transform infrared spectroscopy; acetates; acetic acid; acetone; chemometrics; coffee beans; ethanol; hexane; liquid-liquid extraction; methylene chloride; models; principal component analysis; roasting
Abstract:
... In this feasibility study, Fourier transform infrared (FTIR) spectroscopy and chemometric analysis were adopted to discriminate coffees from different geographical origins and of different roasting degrees. Roasted coffee grounds were extracted using two methods: (1) solvent alone (dichloromethane, ethyl acetate, hexane, acetone, ethanol, or acetic acid) and (2) coextraction using a mixture of equ ...
DOI:
10.1021/jf104980d
PubMed:
21381653

18. Interannual and seasonal changes in the soil exchange rates of monoterpenes and other VOCs in a Mediterranean shrubland

Author:
Asensio, D.; Peñuelas, J.; Prieto, P.; Estiarte, M.; Filella, I.; Llusià, J.
Source:
European journal of soil science 2008 v.59 no.5 pp. 878-891
ISSN:
1351-0754
Subject:
acetaldehyde; acetates; acetic acid; acetone; drought; emissions; foliar uptake; inventories; methanol; monoterpenoids; phenology; roots; seasonal variation; shrublands; soil ecology; soil temperature; soil water; volatile organic compounds
Abstract:
... Information about soil VOC inventories and exchange rates in different soils is very scarce. Seasonality of soil VOC exchange rates is also largely unknown, despite the increasing interest in some soil volatile compounds, such as monoterpenes, because of their important role in soil ecology. We aimed to explore and quantify soil VOC exchange rates in a Mediterranean shrubland and their seasonality ...
DOI:
10.1111/j.1365-2389.2008.01057.x

19. Separation of acylglycerols, FAME and FFA in biodiesel by size exclusion chromatography

Author:
Kittirattanapiboon, Kanisa; Krisnangkura, Kanit
Source:
European journal of lipid science and technology 2008 v.110 no.5 pp. 422-427
ISSN:
1438-7697
Subject:
acetone; acetic acid; acetates; detection limit; vegetable oil; diacylglycerols; free fatty acids; methylene chloride; monoacylglycerols; triacylglycerols; solutes; gel chromatography; animal fats and oils; biodiesel; toluene; molecular weight
Abstract:
... Size-exclusion chromatography separates solutes according to their molecular sizes. Free fatty acids (FFA), fatty acid methyl esters (FAME) and monoacylglycerols (MG) of vegetable oils or animal fats have very close molecular sizes and they cannot be baseline-separated on a single Phenogel column (100 Å, 300 mm x 7.8 mm ID, 5 μm) by using tetrahydrofuran (THF) as the mobile phase. When toluene is ...
DOI:
10.1002/ejlt.200700164

20. Electromigration of a heteroconjugated imidazole-acetate complex in ACN

Author:
Porras, Simo P.; Jussila, Matti
Source:
Electrophoresis 2007 v.28 no.20 pp. 3590-3599
ISSN:
0173-0835
Subject:
acetates; acetic acid; acetone; anions; electrophoresis; equations; hydrogen bonding; ionic strength; methanol
Abstract:
... ACN is an extremely poor hydrogen bond donor and therefore the anions dissolved in it are solvated mainly by other hydrogen bond donors (e.g. uncharged acids) possibly present in the solution. Under properly selected experimental conditions stabilization via hydrogen bonding can be used for separation in CE as has been demonstrated for uncharged acids by several authors. Electromigration based on ...
DOI:
10.1002/elps.200700291