<正>分析优级松节油过热水蒸汽蒸馏操作，并根据优油提馏塔的物料衡算、热量衡算和气液平衡基本关系推导出优油提馏段的操作线方程，用逐板计算法计算出提馏塔的理论塔板数。

First. the operation of super-heat distillation of light oil was analysed. Then, according to material bslance. energy balance and vapor-liquid equilbrium relation in distillation of light oil, the operation line equation of distillation was obtained. Finally, the numbers of theoretical plate were calculated by plste-to-plate method.