Methyl isobutyl ketone

About: Methyl isobutyl ketone is a research topic. Over the lifetime, 2071 publications have been published within this topic receiving 26976 citations. The topic is also known as: Hexone & Isobutyl methyl ketone.

Analysis of Fe, Cu, Ni and Co in fluoride glasses and their precursors

Abstract: A method for the determination of iron, copper, nickel and cobalt in zirconium fluoride and heavy metal fluoride glasses is presented. This method involves dissolution in a boric acid solution, complexation of transition metal ions with sodium diethyl dithiocarbamate and ammonium pyrrolidine dithiocarbamate at pH 2.2, extraction of the complexes with methyl isobutyl ketone, back extraction with Hg (II) solution and graphite furnace atomic absorption spectroscopy analysis. This method is applicable for determination of Fe, Cu, Ni and Co at concentrations

Combustion of volatile organic compounds over composite catalyst of Pt/γ-Al₂O₃ and beta zeolite.

Abstract: Catalytic oxidation of volatile organic compounds (VOCs) was carried out over a composite catalyst comprising Pt/γ-Al₂O₃ and protonated beta zeolite. The conversion of several VOCs such as ethyl acetate, butyl acetate, 2-propanol, 1,2-dichloroethane, and chloroethane over the composite catalyst was higher than the conversion over the conventional Pt/γ-Al₂O₃ catalyst, indicating a remarkable improvement in the oxidation activity of the composite. On the other hand, no difference in the conversion of methyl ethyl ketone, methyl isobutyl ketone, toluene, benzene, and chloroethylene was observed for the composite catalyst versus the Pt/γ-Al₂O₃ catalyst. To clarify the role of the zeolite component, the reaction products obtained using the composite catalyst were compared with those obtained using the Pt/γ-Al₂O₃ catalyst. For the cases in which considerable improvement in the oxidation activity was observed with the composite, it was revealed that the conversion of VOCs to intermediate compounds took place over the acidic sites of the zeolite; the intermediates tended to be easily oxidized to CO₂ on the Pt/γ-Al₂O₃ catalyst. In addition, the composite catalyst also exhibited high durability. High catalytic activity was maintained even after aging at 600°C for more than 1000 h.

Preparation of aromatic carbonyl compound

Abstract: PURPOSE:To obtain an aromatic carbonyl compound efficiently in remarkably high yield, by decomposing a hydroperoxide in the presence of an aqueous layer containing an iron salt, a copper salt and an acid in an atmosphere of an inert gas. CONSTITUTION:A hydroperoxide of formula I [R1 and R2 are H or CH3; R3 and R4 are H, alkyl, -C(CH3)2OH, -COCH3 or COOH, etc.] or formula II is decomposed to give an aromatic carbonyl compound of formula III or IV. In the process, the decomposition reaction is carried out in the presence of an aqueous layer containing an iron salt, copper salt (preferably both being sulfates) and an acid in a solution of the above-mentioned hydroperoxide in an organic solvent, e.g. methyl isobutyl ketone, to give the aimed aromatic carbonyl compound. The molar amounts of the salts are preferably as follows; 0.001-1mol, based on 1mol hydroperoxide group in the hydroperoxide, iron salt and 0.01-4mol, based on 1mol iron salt, copper salt. The amount of the aqueous layer containing the iron salt, copper salt and acid is preferably 10pts.wt. or more based on 100pts.wt. organic solvent layer containing the hydroperoxide.

Extraction Equilibria and Solvent Sublation for Determination of Ultra Trace Bi(III), In(III) and TI(III) in Water Samples by Ion-Pairs of Metal-2-Naphthoate Complexes and Tetrabutylammonium Ion

Abstract: The solvent sublation using ion pairs of metal-2-naphthoate(2-HNph) and tetrabutyl ammonium (TBA + ) ion has been studied for the concentration and determination of ultra trace Bi(III), In(III) and Tl(III) ions in water samples. The partition coefficients (Kp) and the extraction percentages of 2-HNph and the ion pairs to methyl isobutyl ketone (MIBK) were obtained as basic data. After the ion pair TBA + .M(Nph) 4 - was formed in water samples, the analytes were concentrated by the solvent sublation and the elements were determined by GF-AAS. The pH of the sample solution, the amount of the ligand and counter ion added and stirring time were optimized for the efficient formation of the ion pair. The type and amount of optimum surfactant, bubbling time with nitrogen and the type of solvent were investigated for the solvent sublation as well. 10.0 mL of 0.1 M 2-HNph and 2.0 mL of 0.1 M TBA + were added to a 1.0 L sample solution at pH 5.0. After 2.0 mL of 0.2%(w/v) Triton X-100 was added, the ion pairs were extracted into 20.0 mL MIBK in a flotation cell by bubbling. The analytes were determined by a calibration curve method with measured absorbances in MIBK, and the recovery was 80-120%.