Temperature of hydrogenation fine fractionation tower
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The unit contains about 13% straight-run gasoline, which causes the temperature in the upper part of the distillation tower to rise suddenly by 10–20°C. Is this phenomenon normal? Based on the volume of the product, gasoline has been separated – why then is the diesel flash point still occasionally failing to meet the standards? Let’s all share our opinions and discuss freely
Is it normal? Gasoline typically consists of components ranging from C5 to C9, with C9 overlapping somewhat with those found in diesel. The distillation tower isn’t effective enough in separating these components
Your setup is likely a diesel and gasoline mixed hydrogenation unit. It is normal for the temperature in the upper middle part of the distillation tower to rise; the exact amount of increase depends on the type of oil. There are many reasons for the issue of the product’s flash point not meeting the standards, as you mentioned. In the case of a distillation column, it is not possible to ensure that the bottom temperature, top temperature, top pressure, reflux rate, and even the feed temperature and composition entering the distillation column remain constant; therefore, it is quite normal for the flash point to fail to meet the specifications from time to time.