Problems with temperature and pressure at the top of the diesel hydrocracking distillation column
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I would like to ask everyone: Why is the temperature at the top of the distillation column in a diesel hydrogenation unit sometimes around 160°C and sometimes around 190°C? Is it determined by the destination of the naphtha? Furthermore, the pressure at the top of the distillation tower is around 0.18 MPag; is such an operating pressure on the high side? Thank you first
It seems that both the temperature and pressure are a bit high
This is determined based on the dry point of naphtha, as well as the initial boiling point and flash point of diesel. A higher dry point of naphtha necessitates lowering the top temperature of the tower for control purposes.
The dry point of naphtha is the dew point temperature at the top of the tower, under the partial pressure of naphtha
The pressure is a bit high; temperature determines the dry point of naphtha, as well as the amount extracted
The top temperature of the diesel distillation column is influenced by factors such as the operating pressure at the column top, the composition of the feed to the column, temperature, the bottom temperature of the column, and the quality requirements for the product; specific control measures need to be determined based on the quality requirements of the product.