December 2013

Refining Developments

Mitigate fouling in crude unit overhead—Part 3

CASE STUDYThe basis for this case study is shown in Fig. 18; it is a crude unit with overhead heat integration. This is a one-drum overhead system with heat integration and no water wash. In an attemp..

CASE STUDY The basis for this case study is shown in Fig. 18; it is a crude unit with overhead heat integration. This is a one-drum overhead system with heat integration and no water wash. In an attempt to avoid corrosion, the unit configuration takes diesel through heavy naphtha as a single overhead product. The operating conditions are for a mid-run on 21.6°API (0.9241) mixed-crude blend (Fig. 18).     Fig. 18. Water wash added to crude unit—desalter is too cold. The unit was originally constructed as a light-crude topping unit (atmospheric section only). Later additions added a vacuum column and a preflash column. The unit was expanded at the same t

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