Topic
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.
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TL;DR: The proposed method for simultaneously monitoring airborne carbonyls compounds and aromatic hydrocarbons is simple, feasible and has an acceptable accuracy and precision and can be adopted as a reference method for making relevant measurements.
Abstract: Volatile organic chemicals (VOC) such as aromatics and carbonyls are ubiquitous, and have environmental and health significance. This work presents a novel analytical method for simultaneously monitoring airborne carbonyls compounds and aromatic hydrocarbons. Carbonyls were collected onto an adsorbent (Tenax TA, coated with pentafluorophenyl hydrazine (PFPH)) that reacted with carbonyl groups to form thermo-stable derivatives that are suitable for subsequent analysis by thermal-desorption and GC/MS. Aromatic hydrocarbons were collected onto Tenax TA that was packed in the same sampling tube, and analyzed using the same method as carbonyls. Six carbonyls (formaldehyde, acetaldehyde, benzaldehyde, acetone, methyl ethyl ketone and methyl isobutyl ketone) and five aromatics (benzene, toluene, ethylbenzene, xylenes and styrene) were evaluated following standard test protocols. Calibration ranges were 30–200 ng per tube for most test chemicals, and 200–1000 ng per tube for formaldehyde. The analytical precision was 7% or better, and the collection efficiency, tested using a static sampling bag, was between 94 and 98%. PFPH-coated Tenax TA (for collecting carbonyls) needs to be placed in the front section of the tube, and Tenax TA in the back section (for collecting aromatics). The method detection limits of the current method ranged between 0.2 and 25 ng per tube, which corresponded to sub- to 17.2 ppbv (for formaldehyde), based on a typical 6 l sample from a sampling rate of 25 ml/min. Samples were stable for at least ten days under ambient conditions. The proposed method was also tested in the field and proved satisfactory. The proposed method is simple, feasible and has an acceptable accuracy and precision. It can thus be adopted as a reference method for making relevant measurements.
11 citations
11 citations
Patent•
06 Oct 1969
TL;DR: In this paper, a method for producing methyl isobutyl ketone from acetone and hydrogen in one stage with improved conversion and selectivity by contacting acetone in liquid phase with hydrogen in the presence of a catalyst of (a) palladium and synthetic zeolite, or (b) Palladium and alumina together with or without thorium oxide, zirconium oxide and/or chromium oxide.
Abstract: A novel method for producing methyl isobutyl ketone from acetone and hydrogen in one stage with improved conversion and selectivity by contacting acetone in liquid phase with hydrogen in the presence of a catalyst of (a) palladium and synthetic zeolite, or (b) palladium and alumina together with or without thorium oxide, zirconium oxide and/or chromium oxide, at a temperature of 100 DEG to 250 DEG C. and under a partial pressure of hydrogen of 0.1 to 10 kg per square centimeter.
11 citations
TL;DR: In this paper, a review of advances in boron-10 isotope separation by chemical exchange distillation is presented, with a brief introduction of the principle of the separation, the progress on the research of this method and the problems relating to the separation coefficient are discussed.
11 citations
TL;DR: In this article, the 2,4-dinitrophenylhydrazones of long carbon chain produced in beef fat heated at 200°C in air were also examined, and hexanal, heptanal and octanal were tentatively identified by gas-liquid chromatography.
Abstract: Volatile carbonyl compounds produced in beef fat heated at 150°C in nitrogen were investigated. Ethanal, propanal, isobutanal, isopentanal, crotonal, benzaldehyde, acetone, methyl ethyl ketone, methyl isobutyl ketone, glyoxal, and pyruvaldehyde were isolated as their 2,4-dinitrophenylhydrazones and identified by means of thin layer chromatography, infrared, mass and proton magnetic resonance spectroscopy. These carbonyls were considered to be contained also in the volatiles from beef fat heated in air from the results of thin layer chromatography.Volatile carbonyl compounds of longer carbon chain produced in beef fat heated at 200°C in air were also examined, and hexanal, heptanal, 2-heptenal, octanal, 2-octenal, nonanal, 2-nonenal, 2-decenal, 2,4-decadienal and 2-undecenal were tentatively identified by gas-liquid chromatography. The amount of long-chain carbonyls was larger and the oily odor in beef aroma was stronger in beef fat heated in air than in nitrogen.
11 citations