Case 1 Straight-run, Low Sulfur Feed at 32 Bar

This case is based on straight-run low sulfur gas oil containing 0.2 wt% sulfur operating at a hydrogen partial pressure at the inlet of 32 bar. Feedstock properties are given in Table 4. The catalyst is TK-574, a high activity CoMo catalyst. Catalyst cycle length is fixed at l / years. 

For Case 1, reducing the product sulfur content from 500 wppm to 50 wppm whilst maintaining cycle length requires a doubling of reactor volume, and further reduction from 50 wppm to 10 wppm requires the addition of approximately 65% more reactor volume. There is little or no change in other key product properties. The hydrogen consumption is very similar for all four cases. 

Whether or not it is necessary to implement other changes (e.g. revamp of the recycle gas compressor to cope with the increased pressure drop over the reactor system) will depend on the equipment already in place. 

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