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 paper, a novel method for the preparation of α-oso-aldehydes by dimethyl dioxirane oxidation of α -diazoketones is described, particularly useful when the desired compound cannot be purified by chromatography or distillation: the by-products (acetone and nitrogen) can be evaporated and the reaction crude consists only of the pure compound.
42 citations
TL;DR: In this article, the reaction of an equimolar mixture of H2 and CO was studied over ZrO2 at 350 to 450 °C, 35 atm total pressure, and varying residence times.
42 citations
TL;DR: Observations indicate that P11 has a secondary alcohol dehydrogenase that enables it to reduce acetone to isopropanol, while P7 lacks this enzyme, which offers an opportunity for biological production of isOPropanol from acetone reduction in the presence of gaseous substrates (CO, CO2, and H2).
Abstract: Gasification-fermentation is an emerging technology for the conversion of lignocellulosic materials into biofuels and specialty chemicals. For effective utilization of producer gas by fermenting bacteria, tar compounds produced in the gasification process are often removed by wet scrubbing techniques using acetone. In a preliminary study using biomass generated producer gas scrubbed with acetone, an accumulation of acetone and subsequent isopropanol production was observed. The effect of 2 g/L acetone concentrations in the fermentation media on growth and product distributions was studied with “Clostridium ragsdalei,” also known as Clostridium strain P11 or P11, and Clostridium carboxidivorans P7 or P7. The reduction of acetone to isopropanol was possible with “C. ragsdalei,” but not with P7. In P11 this reaction occurred rapidly when acetone was added in the acidogenic phase, but was 2.5 times slower when added in the solventogenic phase. Acetone at concentrations of 2 g/L did not affect the growth of P7, but ethanol increased by 41% and acetic acid concentrations decreased by 79%. In the fermentations using P11, growth was unaffected and ethanol concentrations increased by 55% when acetone was added in the acidogenic phase. Acetic acid concentrations increased by 19% in both the treatments where acetone was added. Our observations indicate that P11 has a secondary alcohol dehydrogenase that enables it to reduce acetone to isopropanol, while P7 lacks this enzyme. P11 offers an opportunity for biological production of isopropanol from acetone reduction in the presence of gaseous substrates (CO, CO2, and H2). Biotechnol. Bioeng. 2011;108: 2330–2338. © 2011 Wiley Periodicals, Inc.
42 citations
TL;DR: In this article, the effects of changes in phenol, hypochlorite and catalyst concentrations on the indophenol blue reaction to determine ammonia-nitrogen, using acetone and sodium nitroprusside as catalysts.
42 citations
TL;DR: In this paper, a combined experimental, spectroscopic and theoretical study of acid-catalyzed dehydration-etherification of fructose in ethanol for understanding the mechanistic role of polar solvent additives and product selectivity is presented.
Abstract: We report on a combined experimental, spectroscopic and theoretical study of acid catalysed dehydration-etherification of fructose in ethanol for understanding the mechanistic role of polar solvent additives and product selectivity. Herein, we show that polar solvent additives (e.g. tetrahydrofuran, acetone, acetonitrile, gamma-valerolactone, dimethyl sulfoxide) protonated with a common solid acid catalyst in ethanol allow transformation of biomass-related compounds into desired dehydration or etherification products. Fructose in ethanol with DMSO additive is selectively transformed into 5-hydroxymethylfurfural with negligible formation of 5-ethoxymethylfurfural due to preferential DMSO protonation according to its polarity. Spectroscopic methods and density functional theory show that additives having higher polarity than ethanol are readily protonated and act as the key catalytic protonation species and as the key stabilization species for reaction intermediates. Understanding the mechanism of protonated polar additives in reaction systems allows one to tailor selectivity in acid-catalyzed dehydration-etherification schemes and to develop sustainable chemistry for biomass resources.
42 citations