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.

Synthesis of methyl isobutyl ketone from acetone over metal-doped ion exchange resin catalyst

Abstract: The kinetics of one-step synthesis of methyl isobutyl ketone from acetone was studied in the presence of the bifunctional commercial ion exchange resin, Amberlyst CH28 over a wide range of temperature, total pressure and catalyst loading in a batch reactor. An activity-based kinetic model is proposed to predict the observed results, with the non-idealities of the liquid phase being described using the UNIQUAC method. Formation of mesityl oxide was found to govern the overall rate of reaction. Low reaction rates were observed at higher conversion, possibly due to a pseudo-equilibrium caused by reversible deactivation of the catalyst as a result of formation of water in the reaction system. Simultaneous removal of water during the course of the reaction may result in an enhanced conversion.

Using Butanol Fermentation Wastewater for Biobutanol Production after Removal of Inhibitory Compounds by Micro/Mesoporous Hyper-Cross-Linked Polymeric Adsorbent

Abstract: In the present study, a novel micro/mesoporous hyper-cross-linked polymeric adsorbent, SY-01, was tested to remove several inhibitory compounds from butanol fermentation wastewater (BFW) for biobutanol production for the first time. Characterization of the SY-01 resin was determined by scanning electron microscopy, nitrogen adsorption desorption isotherms, Fourier transform infrared spectroscopy and elemental analysis. The results showed that the SY-01 resin possessed a high Brunauer-Emmett-Teller surface area (1334 m(2)/g) with large rnicropores and mesopores volumes (0.42 and 0.69 mL/g, respectively). After fixed-bed column adsorption, more than 96.0% of D-xylose and 95.0% of o-glucose remained in the treated butanol fermentation wastewater (TBFW). Acetic acid removal varied from 5.1% to 18.7%, butyric acid removal varied from 64.9% to 100% and color removal was effective between 52.9% and 99.2%. In the column desorption process, 99.4% of acetic acid and 99.1% of butyric acid were recovered by an acetone solution. Furthermore, the TBFW was used as substrate for biobutanol production by Clostridium acetobutylicum CH06. The detoxification by the SY-01 resin column increased the maximum acetone butanol ethanol concentration by 4.08 times and enhanced the total sugar utilization by 1.95 times. In conclusion, our results suggest a new approach for treating the butanol fermentation wastewater.

Cellulose acetate solution and process for the preparation of the same

Abstract: A cellulose acetate solution has cellulose acetate in a solvent. The cellulose acetate has an average acetic acid content in the range of 58.0 to 62.5%. In the first embodiment of the invention, the solvent is a mixture of acetone and another organic solvent. The organic solvent is an ether having 3 to 12 carbon atoms, a ketone having 4 to 12 carbon atom, an ester having 3 to 12 carbon atoms, or an alcohol having 1 to 6 carbon atoms. In the second embodiment, the solvent is the ether, the ketone or the ester. Processes for the preparation of the solution and a cellulose acetate film are also disclosed.

Carbon-Dioxide Fixation as the Initial Step in the Metabolism of Acetone by Thiosphaera-Pantotropha

Abstract: SUMMARY: Evidence is presented for a new pathway of acetone metabolism in Thiosphaera pantotropha. The initial step involves a carboxylation, probably resulting in the formation of acetoacetate. Cells grown on acetone and propan-2-ol fixed large quantities of 14CO2, in contrast to cells grown on acetate and acetoacetate. Growth on acetone and propan-2-ol, but not on other substrates, was dependent on the exogenous supply of CO2. NMR studies on the labelling pattern of the intracellular poly-β-hydroxybutyrate (PHB) confirmed that C2 units are produced from acetone after initial carboxylation. The metabolism of acetone and propan-2-ol was associated with drastic changes in the ultrastructure of the organisms. During growth on these substrates, proteinaceous, crystalline inclusions were observed. These were absent in acetate-grown cells. The nature of these crystalline inclusions remains to be elucidated.