Topic
Acetone
About: Acetone is a research topic. Over the lifetime, 9458 publications have been published within this topic receiving 120867 citations. The topic is also known as: propanone & dimethylketone.
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TL;DR: In this article, both acidic and basic carbon based catalysts have been prepared by chemical activation of olive stone waste with H3PO4 and H2SO4 of acid character and Ca(OH)2 and Ba(OH)-2 of basic character.
60 citations
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TL;DR: In this article, the carboxymethylation of wood pulp cellulose and cotton linters cellulose in different organic media, namely, ethanol, acetone, and ethanol-acetone mixtures, is performed.
Abstract: A study of the carboxymethylation of wood pulp cellulose and cotton linters cellulose in different organic media, namely, ethanol, acetone, and ethanol-acetone mixtures, is performed. Previously, the ethanol-acetone 1 : 1 (w/w) mixture used as reaction medium was found to give a higher degree of substitution (DS) than the pure solvents separately. In the present work, the kinetic investigation of cellulose carboxymethylation was carried out in ethanol-acetone 3 : 7 (w/w) mixture, as well as in acetone as reaction media, and the same synergistic effect of the solvents mixture was observed. The data suggested a pseudo-first-order kinetic behavior satisfactorily described by the following equation: ln(1.11 − DS) = −kt. The two reaction steps observed are related to the transformations of less ordered regions with higher reaction rate and more ordered regions with smaller reaction rates, respectively. A possible explanation for this behaviour is given, taking into account the different structural changes of cellulose crystallinity and accessibility produced by ethanol-acetone 3 : 7 (w/w) mixture, ethanol, and acetone, as revealed by X-ray diffraction and calorimetry determinations. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67: 481–486, 1998
60 citations
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TL;DR: In this paper, the hydrogenation of benzylidene acetone has been accomplished under biphasic conditions (water/diethyl ether) utilizing CpRu(PTA)2H as the catalyst under mild conditions.
60 citations
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TL;DR: In this article, the adsorptions of acetone on various Bronsted and Lewis acid sites (from weak acid to superacid) are theoretically studied, in order to elucidate the quantitative relationship between C-13 chemical shifts of the acetone and intrinsic acid strength of solid acids.
Abstract: Adsorption of basic probe molecules is one of the widely used methods to characterize the acid strength of solid acids. In this contribution, the adsorptions of acetone on various Bronsted and Lewis acid sites (from weak acid to superacid) are theoretically studied, in order to elucidate the quantitative relationships between C-13 chemical shifts of acetone and intrinsic acid strength of solid acids. The Bronsted acid sites are represented by a series of 8T zeolite models with varying terminal Si-H bond lengths, and the different extents of acidic proton transfer from these acid sites to acetone are revealed explicitly. We found that three adsorption conformations (hydrogen-bonded, proton-shared, and ion-pair) exist for acetone, and concurrently, a correlation of three-broken lines is obtained for the C-13 chemical shift of acetone versus the deprotonation energy (DPE). The correlation can be used as a scale for quantitatively measuring the Bronsted acid strength of solid acids. A threshold of 245 ppm is determined for superacidity, in good agreement with the experimental value (244 ppm). The Lewis acid sites are modeled by tricoordinate framework aluminum species and various extra-framework aluminum cations or neutral species such as Al3+, AlO+, AlOH2+, Al(OH)(2)(+), Al(OH)(3), and AlOOH. We found that acetone is coordinately adsorbed on the aluminum atoms of Lewis acid sites and that the C-13 chemical shift of acetone is almost linear to the lowest unoccupied molecular orbital (LUMO) energy of the acid sites.
60 citations
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TL;DR: Sugar beet pulp (SBP) has been investigated as a promising feedstock for ABE fermentation by Clostridium beijerinckii but a pretreatment is needed to enhance enzymatic hydrolysis and fermentation yields.
59 citations