Why does residual heat remain throughout the entire tower in crude oil distillation?
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Why does residual heat remain throughout the entire tower in crude oil distillation? I would be extremely grateful if the seniors could give me some guidance!
This residual heat is necessary to ensure the quality of each side stream as well as the degree of overlap between them; therefore, the distillation column needs to have a large temperature gradient. If heat removal is stopped and this temperature gradient is to be established through vapor-liquid equilibrium, a very high column height would be required. In reality, a high tower height is not required to achieve the desired precision in product fractionation.
The reasons for residual heat include: first, an imbalance in materials, that is, more heat enters the tower than exits it. II. The vaporization rate is too high, causing the tower top cooling system to become overloaded.