Precise control of the dry point of heavy naphtha
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Our 700,000-ton hydrogenation unit’s distillation system consists of a stripping tower, a main distillation tower, and a side-stream stripping tower connected to the side stream of the 11th tray of the main distillation tower. The top product of the main distillation tower is C5 oil, while the bottom product is National V diesel. The side-stream tower is primarily used to produce heavy naphtha, with the dry point of this naphtha needing to be controlled between 167 and 175 degrees. Do any of you have any good methods for achieving precise control?
The requirement for controlling deviations is a bit high. I am working at a hydrocracking unit, where the dry point control for heavy oil is required to be between 155 and 175. Heavy stone is produced at the top of the distillation tower; based on personal experience, the dry point of the heavy stone is mainly determined by the temperature and pressure at the tower top, with pressure being particularly important.