The diesel fraction from a hydrogenated shale oil as reported previously, proved to be a satisfactory catalytic cracking charge stock it however, gave a somewhat poorer product distribution than our typical heavy California virgin vacuum distillate. To improve the catalytic cracking characteristics of the diesel fraction, it was felt that the nitrogen content should be further lowered, so the U. S. Bureau of Mines forwarded a rehydrogenated coker distillate containing .003 weight per cent nitrogen. The hydrogenation operation was reportedly carried out at 825 degrees F., at a pressure of 100 p.s.i., a hydrogen injection rate of 3,200 cubic feet per barrel, and a liquid hourly space velocity of 1. The liquid recovery was 98 volume per cent, of which 84.1 volume percent was in the diesel fuel boiling range, and 15.0 volume percent was naphtha.