Abstract
The preceeding experiment showed an impossibility of determination of the velocity of thermal decomposition of acetone and ketene by the static method. Therefore, the thermal decomposition reaction of acetone with addition of a small amount of carbon disulfide was carried out by passing through two kinds of chromium nickel steel (25: 20) reaction tubes with internal diameters 25 mm. and 4 mm. It was discovered that the rate of reaciton of acetone was equal to rate of formation of methane, square of the rate of methane formation was equal to rate of formation of carbon monoxide, and the value obtained by substracting the rate of formation of carbon monoxide from the rate of formation of methane, and the rate of formation of ketene. respectively, was approximately equal. The result indicated that acetone was decomposed into ketene and methane without dehydrogenating reaction, and the ketene was further decomposed into carbon monoxide and other substances. An apparent thermal decomposition of acetone is the first order reaction. The total activation energy for thermal decomposition of acetone was 63 kcal/mole. The velocity constant of thermal decomposition of ketene was twice as much greater than that of acetone and it was assumed that the total activation energy the same as that of acetone, if it was assumed that the themal decompsition of ketene was the first order. There was mutual quantitative relation in the formed gases and the determination of either of methane or carbon monoxide in waste gas gives an information on the rate of reaction of acetone and the yield of ketene.
