was maintained for one hour after which the temperature of the catalyst bed was raised to 400 u00b0 c while the hydrogen was continued to be passed thereover for an additional four hour period hydrogenation as discussed below then proceeded pretreatment of the catalyst need not be done as indicated above but can be carried out by passing hydrogen over the catalyst in a substantially inert atmosphere while maintaining the temperature in the catalyst bed between about 250 u00b0 to about 600 u00b0 c and a hydrogen partial pressure of about 1 0 to about 1000 pounds per square inch gauge about 0 007 to about 7 0 mpa for about 0 5 to about 48 hours the desired hydrogenation was effected by passing 33 grams of the liquid feed per hour as measured at ambient temperature and ambient pressure that is at a liquid hourly space velocity of 8 0 and four liters per hour of hydrogen while maintaining the temperature of the catalyst bed at 50 u00b0 c and the hydrogen partial pressure at 100 pounds per square inch gauge 0 8 mpa the reaction was permitted to proceed in each run for five hours the results obtained are tabulated below in tables i and ii in each of examples i and.