The liquid phase hydrogenation of cyclohexene on a 5% platinum on ｒ-alumina catalyst was investigated to obtain the intrinsic reaction rate data. A well-stirred semi-batch reactor was employed. Intrinsic reaction rate data were obtained with the catalyst powdered to an 270-325 mesh size and in the temperature range between 30℃ and 60℃.
From the experiment of effect of stirring speed on the reaction rate, mass transfer resistances are found to be negligible above 2,000rpm. Experimental evidence and numerical calculations show that the mass transfer resistances both outside and inside the catalyst powder are negligble. The reaction rate is found to be first order with respect to the concentration of hydrogen and zero order with respect to the concentration of cyclohexene. The activation energy is 7.1 Kcal per gram mole. Also the effect of various solvents on the reaction rate was investigated.
With the $\frac{1}{4}''$, $\frac{1}{8}"$ catalyst pellets effectiveness factor, effective diffusivity, tortuosity factor were obtained. Through the destruction test we compare the activity of catalyst powder with that of catalyst pellets.
5% Platinum 촉매를 사용하여 cyclohexene의 액상반응을 교반반응기 내에서 행하였다.
30℃∼60℃의 온도범위 내에서 270∼325 mesh 크기의 촉매분말을 사용하여 intrinsic reaction rate를 구하였다.
교반속도에 따른 반응속도의 영향을 관찰한 결과, 2000rpm 이상에서 mass transfer resistance가 무시됨을 알 수 있었다. 실험과 Carberry criterion을 적용하여 본 실험의 system에서는 mass transfer resistance가 존재하지 않음을 증명하였으며 수소농도에 대해서는 1차반응이며 cyclohexene의 농도에 대해서는 0차반응이었다.
Arrhenius plot에 의해 구한 activation energy는 grammole당 7.1 Kcal 이다.
또한 여러가지 용매가 반응속도에 미치는 영향도 관찰하였는데 aromatic solvent는 반응속도에 커다란 영향을 미치나 non-aromatic solvent는 반응속도에 영향을 미치지 않는다는 것을 알 수 있었다.
$\frac{1"}{4}$, $\frac{1"}{8}$ 크기의 catalyst pellet을 사용하여 effectiveness factor, effective diffusivity, tortuosity factor를 구했으며 destruction test를 통하여 catalyst powder의 activity와 catalyst pellet의 activity를 비교하였다.
