中文摘要：

松节油是经松脂蒸馏分离出的中性油，其主要组分是α-蒎烯和β-蒎烯（C10H16）双环单萜烯^[1]。蒎烯可以开环异构为柠烯、莰烯单环萜烯。柠烯具有广泛的用途：在香料工业方面，它不仅可在软饮料、糖果、烘烤食品、口香糖等食品中作为食物香料直接使用，而且还被用于生产香芹酮心’等几十种高级香料；

英文摘要：

The gas chromatography-mass spectrometry-data system （GC-MS-DS） is used to study the changes of major chemical components and to discuss the reaction mechanism during catalytic isomerization of turpentine over Pd/C. At 250 ℃, when the quantity of catalyst is 0. 05% turpentine weight, we study the catalytic isomerization of turpentine to prepare high-strength limonene. The contents of pinene and limonene are respectively 8. 36% and 57.67% at reaction time of 120 min, while camphene is just 2. 72% of the oil. The tracking analysis indicats that the reaction rate of pinene isomerizing to monocyelic monoterpene is faster than that to acyclic monoterpene, and pinene isomerized to limonene is the main reaction, whose speed is greater than that of camphene. Meanwhile, we find that the content of sesquiterpene is not changed on the whole.