Low-pressure depropanizer
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Why does the cooling power consumption for propylene freezing in the condenser increase when an ethylene plant uses a single-tower low-pressure depropanization tower, compared to when a high-pressure depropanization tower is used?
As I understand it, the temperature at the top of the twin towers is high; the high-pressure tower is cooled using circulating water, while the low-pressure tower is cooled using circulating water together with C3R to bring the temperature down to around 20 degrees. Compared to the single-tower De C3, the double-tower system uses circulating water to replace part of the C3R, resulting in a lower grade of refrigerant and thus energy savings.