Synthesis Of Methyl Isobutyl Ketone Research Articles

Na promotion of Pd/MgO catalysts for low-pressure one-step synthesis of MIBK from acetone + H 2

Highly selective one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen at 200°C and 1 atm has been developed utilizing magnesia-supported palladium catalysts. Sodium vapor deposition on magnesia followed by impregnation with tetraamine palladium (II) chloride apparently enhances the catalyst basicity as compared with that of magnesia supported palladium, resulting in a great increase of both acetone conversion and MIBK yield. Such a catalyst exhibits good stability, high activity and MIBK selectivity; it gives 47–64% conversion, 50–65% MIBK selectivity and 31–33% MIBK yield during a period of 8 h on stream.

One-step synthesis of methyl isobutyl ketone catalyzed by palladium supported on niobic acid

The one-step synthesis of methyl isobutyl ketone from acetone and hydrogen was investigated by using Pd/Nb 2O 5· nH 2O catalyst. Pd/Nb 2O 5·nH 2O showed much higher catalytic activity and selectivity than Pd/γ-Al 2O 3. Palladium metal, supported on niobic acid, seems to inhibit the hydrogenation of CO double bond. As a result, isopropanol was scarcely formed. Efficiency of the bifunctional catalyst probably depends not only on its acidic character but also on the dispersion state of the palladium metal on the catalyst surface. The catalytic activity of Pd/Nb 2O 5·nH 2O, as was expected, decreased slightly with an increase in the water content. This is one of the excellent properties of niobic acid in comparison with other usual solid acids. Pd/Nb 2O 5· nH 2O catalyst also showed good durability for methyl isobutyl ketone formation.

Integration of pervaporation for the removal of water in the production process of methylisobutylketone

Results of pervaporation experiments are reported for the dehydration of two different mixtures: a ternary synthetic mixture containing acetone, methylisobutylketone (MIBK) and water and a so-called product mixture consisting of 50–60 wt% acetone 40-30 wt% MIBK 7–8 wt% water and 3-2 wt% by-products as directly obtained from a MIBK production plant. The pervaporation experiments have been carried out with PVA composite membranes of different degrees of crosslinking and two different types of TexSep composite membranes. The influence of feed composition, permeate pressure and temperature on the separation characteristics has been investigated. Especially the highly crosslinked PVA-1001 membrane yields high water concentrations in the permeate and fluxes good enough for practical application. The pervaporation results for the PVA-1001 membrane obtained with a laboratory test cell are compared with results obtained in a pilot unit. Two possibilities for integrating a pervaporation unit in a process of the synthesis of MIBK are discussed in detail.

Application of a new hydrogenated aluminophosphate oxynitride (ALPON) as a catalytic support for the one-step synthesis of methyl isobutyl ketone from acetone

A new hydrogenated aluminophosphate oxynitride (ALPON) obtained by nitridation of AlPO 4 can be used as a support to prepare a polyfunctional catalyst with both basic and metallic sites. Ni/ ALPON catalyst was effective for the low-pressure one-step methyl isobutyl ketone (MIBK) synthesis from acetone. The selectivity of the process depended on the temperature and time-on-stream of the hydrogen reduction treatment suggesting that selective MIBK production is achieved by a fine balance between basic and metallic sites.

Direct Synthesis of Methyl Isobutyl Ketone by Reductive Aldol Condensation. III. Kinetics

Abstract The kinetics of the direct catalytic conversion of acetone and hydrogen into methyl isobutyl ketone (MIBK) were investigated in the liquid phase using palladium–zirconium phosphate as a catalyst. Kinetic studies on the conversion of acetone into mesityl oxide (4-methyl-3-pentene-2-one) and its hydrogenation were separately carried out using the same catalyst. It was found that the direct reaction proceeded via a sequence of processes: mesityl oxide was first formed by condensation of acetone on acid sites of the catalyst and MIBK was then produced by hydrogenation of the mesityl oxide on palladium metal in the catalyst. Moreover, the experimental results were well interpreted by assuming that the condensation of acetone was controlled by a surface reaction between the acetone molecules adsorbed on the catalyst surface and that the rate of hydrogenation of mesityl oxide was determined by a surface reaction between dissociated hydrogen atoms and adsorbed mesityl oxide molecules.