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4-Metylopent-3-en-2-on – metoda oznaczania

Jeżewska A.

Podstawy i Metody Oceny Środowiska Pracy

2007

Nr 4 (54)

79--84

Metoda polega na adsorpcji par 4-metylopent-3-en-2-onu na ORBO-33, desorpcji roztworem propan-2-olu w disiarczku węgla i analizie chromatograficznej (GC-FID) otrzymanego roztworu. Oznaczalność metody wynosi 2 mg/m3.

Determination of a worker’s exposure to airborne 4-methyl-3-penten-2-one is made using ORBO-33 tube (100/50 mg sections). Samples are collected at a maximum flow rate of 12 litres/hour until a maximum collection volume of 12 litres is reached. After sampling the ORBO-33 tube is desorbed in carbon disulfide/propan-2-ol (98:2). Analysis is conducted by gas chromatography using a flame ionisation detector (GC-FID). The determination limit of the method is 2 mg/m3.

Production of isophorone by the vapour-phase self-condensation of acetone over the hydrotalcite-derived catalysts

Kuśtrowski P., Sułkowska D., Chmielarz L., Cap S.

Polish Journal of Chemical Technology

2004

Vol. 6, nr 4

41-46

The magnesium-aluminum precursor with the structure of hydrotalcite, confirmed by XRD and FTIR, was transformed into mixed metal oxides by a thermal activation at 450, 500, 550 or 600°C for 16 h. The obtained catalysts were characterized with respect to their textural properties (surface area, total porosity and pore size distribution) and used in the gas-phase aldolization of acetone. The effect of reaction temperature and calcination conditions on the catalytic performance was studied. The highest initial conversion of acetone (87.1%) with the selectivity to isophorone of 89.7% was measured for the hydrotalcite-derived Mg-Al oxides calcined at 600°C in the reaction carried out at 240°C.