Cyclic process for hydrotreating petroleum feedstocks

Details Cyclic process for hydrotreating petroleum feedstocks Cyclic process for hydrotreating petroleum feedstocks

1994-12-22

1998-01-13

Myers, Helane

Mineral oils: processes and products

Refining

Sulfur removal

208 12, 208 78, 208218, C10G 4502

Patent

active

057075115

ABSTRACT:
A process for simultaneously removing heteroatoms, such as sulfur, from a virgin distillate stream and a light catalytic cyclic stream in two reaction zones in a hydrotreating process unit. One reaction zone will be a low temperature reaction zone and the other will be the high temperature zone. In the low temperature reaction zone, the cracked stream is reacted with a hydrotreating catalyst at a predetermined temperature and in high temperature reaction zone, the virgin distillate stream is reacted with a catalyst which is less reactive than that of the first reaction zone. When catalyst in the high reaction zone is replaced with fresh catalyst the temperature is lowered so that it now becomes the low temperature zone in which the cracked stream is redirected. Correspondingly, the virgin stream is redirected to the other reaction zone whose temperature is now raised and which becomes the high temperature zone and which now contains a catalyst less active than the low temperature reaction zone which now contains the fresher more active catalyst. This cyclic operation is repeated each time fresh catalyst is substituted for spent catalyst.

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