The feed streams in many distillation columns contain small amounts of very light components that must be removed in the overhead system. To avoid having to operate at the high pressures or low temperatures required to totally condense the distillate, a small vapor vent stream is removed from the top of the reflux drum. This paper considers the economic and controllability issues involved in the design and control of these inert venting systems. An important engineering trade-off exists between product losses in the vent and energy consumption leads to an optimum operating pressure, which varies with the concentration of inert in the feed.

中文翻译：

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惰性排气蒸馏塔的设计与控制

许多蒸馏塔中的进料流包含少量非常轻的组分，必须在塔顶系统中将其除去。为了避免必须在完全冷凝馏出物所需的高压或低温下运行，请从回流鼓顶部除去少量的蒸汽排放流。本文考虑了这些惰性通风系统的设计和控制中涉及的经济性和可控性问题。在通风口中的产品损失与能耗之间会存在重要的工程折衷，这会导致最佳工作压力，该压力随进料中惰性气体的浓度而变化。