Chemical Equilibria and Kinetics in the Catalytic Formation of Methyl Mercaptan and Dimethyl Sulfide

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  • メチルメルカプタンおよびジメチルサルアイド接触合成反応の平衡論ならびに速度論
  • メチルメルカプタン オヨビ ジメチルサルファイド セッショク ゴウセイ ハンノウ ノ ヘイコウロン ナラビニ ソクドロン

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The relation between methyl mercaptan and dimethyl sulfide, two product com-pon entsobtained from the vapor phase reaction of hydrogen sulfide and methyl alcohol over gamma-alumina catalyst, agreed with the equilibrium calculated from the equation 2 CH3SH CHCH3SCHCH3+HCH2S, assuming that Kp is 1.57 at 370°C. The true equilibrium states were confirmed by carrying out the reaction from both sides of the equation. A 2.2 kcal difference was noted in the value of free energy of formation of the reaction between the value calculated from the measured equilibria and that reported in the literature. This may be attributed to the probable errors in estimating the heat of formation of methyl mercaptan and dimethyl sulfide. The velocity of formation of methyl mercaptan and dimethyl sulfide from hydrogen sulfide and methyl alcohol over gamma-alumina catalyst of 2 mm diameter at 390°C was shown as follows:

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