A simple and cheap petroleumvapor mass concentration analysis method is needed.
在该领域研究中，迫切需要简单、便宜的油气质量浓度分析方法。
2
The procedures of some typical vapor-liquid equilibrium calculations of petroleum fractions based upon spline techniques are given in the paper with good agreement with laboratory data.
提出了基于样条函数技术对石油馏份所作的若干种典型汽液平衡计算步骤，并给出了令人满意的数值计算结果。
3
A nonequilibrium nonlinear dynamic model of petroleum fractionators is developed in this paper by directly taking into account the mass and heat transfer between liquid and vapor in the tower.