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.

Acetone transformation over Pt/H[Al]ZSM5 and Pt/H[Ga]ZSM5 catalysts: Evidences of a Pt–Ga interaction

Abstract: Acetone transformation into methyl–isobutyl ketone (MIBK) under hydrogen atmosphere, using bifunctional catalysts of the platinum supported over medium-pore zeolites (MFI)-type, was studied. This methodology offers a number of advantages; however, since it implies working at low hydrogen pressure (PH2 ) with respect to the acetone pressure (PAc), a rapid catalyst deactivation is observed. Therefore, to minimize deactivation of bifunctional catalysts, a solid with less strong acidic sites has been considered as a platinum support. In this sense, the use of an MFI-type gallosilicate has been deemed convenient to compare the results with those obtained over a catalyst of the platinum/aluminosilicate MFI-type. The H[Al]ZSM5 and H[Ga]ZSM5 solids were synthesized and evaluated by means of DRX, nitrogen adsorption at −196 °C, TPD–NH3 and chemical analysis, and later used as a support for the metallic phase. Platinum of 0.50 wt.% was introduced by means of the exchange–impregnation method and the Pt(NH3)4Cl2 salt was used as a platinum precursor. The solids were calcinated under dry air flow at 300 °C for 6 h and then reduced under dry hydrogen atmosphere at 500 °C also for 6 h. The bifunctional catalysts obtained, 0.50Pt/H[Ga]ZSM5 (Si/Ga=42) and 0.50Pt/H[Al]ZSM5 (Si/Al=40), were evaluated by means of chemical analysis, nitrogen adsorption, transmission electronic microscopy (TEM), electronic paramagnetic resonance (EPR), and the model reactions of toluene-hydrogenation and n-heptane hydrocracking under the conditions established in previous works. Acetone transformation was run in a dynamic reactor at 160 °C, atmospheric pressure, PAc/PH2=3 and variable WHSV. The results obtained with the model reactions and the acetone transformation shows that metallic centers in the Pt-gallosilicate catalysts exhibit a much lower hydro-dehydrogenating activity than that of the metallic centers in the Pt-aluminosilicate catalyst; this, together with the EPR results, seems to indicate that a strong interaction between platinum and a species of structural or extra-structural gallium (EFGS) of the support used has occurred over the Pt/H[Ga]ZSM5 catalyst.

Determination of gold in waters in the nanogram range by anion exchange and atomic absorption spectrophotometry

Abstract: A method has been developed whereby nanogram amounts of gold in waters can be accurately determined. The development of the method involves determination of optimum conditions for the complete recovery of gold from water using an anion exchange resin column, quantitative elution of gold from the resin, and final measurement of gold by atomic absorption spectrophotometry following MIBK (methyl isobutyl ketone) extraction of gold from a nitric acid solution.

Biofiltration for removal of methyl isobutyl ketone (MIBK): experimental studies and kinetic modelling.

Abstract: The present study deals with the biofiltration of methyl isobutyl ketone (MIBK), which is considered to be a highly toxic volatile organic compound. It is released from the paint and petrochemical industries and is one of the major contributors to air pollution. The biofiltration study was carried out on a lab scale for two months in the presence of acclimated mixed culture. The performance of the biofilter column was evaluated for different inlet loads of MIBK at air flow rates ranging from 0.18 to 0.3 m3 h(-1). The maximum removal efficiency of 93% was obtained after 60 days of biofilter operation for an inlet MIBK concentration of 0.45 g m(-3), and a microbial concentration of 2.36 x 10(8) CFU g(-1) of packing material was obtained. This led to a study of shock loadings for 20 days, by varying the inlet MIBK load and air flow rate after every five days, to observe the behaviour of the biofilter column in removing sudden loads of MIBK. The biokinetic constants r(max) and Ks were obtained using the Michaelis-Menten kinetics and were found to be 1.046 g m(-3) and 0.115 g m(-3) h(-1),respectively, with a coefficient of determination (R2) of 0.993. The obtained experimental results were validated with the Ottengraf and Van den Oever kinetic model. The critical inlet concentration, critical inlet load and biofilm thickness were also estimated using the results obtained from the model predictions.

Synthesis of Methyl Isobutyl Ketone over Pd/MgO/SiO2

Abstract: In this paper, we have examined the activity and selectivity of catalysts for the one-step, gas phase production of methyl isobutyl ketone (MIBK) from acetone (propanone) over the temperature range 373−573 K. The catalysts used were an impregnated MgO/silica, a Pd-MgO/silica formed from coimpregnation of the nitrates, and a Pd supported on a 1% Mg doped silica, Pd/Mg-SiO2. Using MgO/silica, mesityl oxide (MO) was formed with 100% selectivity at 373 and 473 K. Addition of Pd gave 100% selectivity to MIBK at 373 K, albeit at low conversion. Pd-MgO/silica revealed a promotional effect of the MgO on the hydrogenation function of the Pd and a promotional effect of the Pd on the aldol condensation activity of the MgO. The Pd/Mg-SiO2 catalyst showed high selectivity but low conversion, as no promoting effect was observed.