Straight-run Kerosene Research Articles

Sulfiding hydrogenation catalysts

A study was carried out in high-pressure hydrogenation units with circulation of hydrogen-rich gas to determine the influence of the type of sulfiding agent on the activity of two samples of nickel-molybdenum catalysts in the dearomatization of a straight-run cut from West Siberian crude. The catalysts were sulfided by various sulfur-containing agents including hydrogen sulfide, elemental sulfur, a solution of elemental sulfur in a low-sulfur straight-run kerosene cut, and a solution of thiophene in a straight-run kerosene cut. The most effective agent was hydrogen sulfide. The activity of the catalysts in oxide form was also determined.

Changes in the group composition of organosulfur compounds during hydrofining of kerosene distillates

1. The group composition of the organosulfur compounds in the straight-run kerosene distillates from the Arlan, Bondyug, and Tuimazy crudes has been investigated. 2. Study has been made of the effect of hydrofining conditions on the group composition of the organosulfur compounds in these distillates. 3. It has been shown that hydrofining primarily removes mercaptans and disulfides, which are mot detrimental to the thermal-oxidation stability of jet fuels. 4. It has been established that with optimum hydrofining depth (system pressure 30 atm, reaction temperature 325°C, space velocity of feed 6–8 h−1) the organosulfur compounds in the fuels are represented mainly by thiophens and stable sulfides. 5. In order to obtain the T-7 type fuel with high stability, the hydrofining of kerosene distillates should be performed under the optimum conditions (with allowance made for crude quality), that rule out the kerosene distilates being refined.