三硫化鉬觸媒氫化薄荷酮之研究

Catalytic Hydrogenation of Menthone with Molybdenum Trisulfide

蘇茀第(Phou-Ti Sou)

《化學》 57年1期 (1968/03) Pp. 14-21

https://doi.org/10.6623/chem.1968003

摘要

用三硫化鉬作觸媒，氫化薄荷酮製造薄荷腦，以用三硫化鉬6%，氫氣壓力約80kg/cm^2，溫度在220°C，反應5小時最佳，薄荷腦轉化率最高為54 %， 含有L-menthol 53.82%，D-isomenthol 10.61 % 及D-neomenthol 33.63%，同時有若干生成之薄荷腦被脫水而變為p-menthene，並有少量薄荷酮仍未起反應。反應溫度低時，大部份薄荷酮保持原狀，反應溫度高時，則全部生成之薄荷腦被三硫化鉬脫水而變為p-menthene，繼續再氫化為p-menthane。

並列摘要

Hydrogenation of menthone with molybdenum trisulfide as catalyst is proved to be a feasible process to obtain menthol. The reaction is brought forward under 220°C for 5 hrs, employing 6% catalyst with H_2 pressure 80 kg/cm^2. A conversion of menthol as high as 54% is obtained. The products is composed of 53.82% L-menthol, 10.61% D-isomenthol, and 33.63% D-neomenthol. The balance is menthone which remains unreacted and p-menthene which is interpreted as a dehydration product of the menthol. Temperature should be strictly controlled around 220°C, below which conversion of menthol is very low, while over 250°C the produced menthol will be completely turned to menthene by losing one molecule of water and on further hydrogenation to p-menthane.