| 摘要 |
In a method of hydroprocessing a petroleum residuum fraction, there is formed in a hydrothermal treating-stripping zone (10) a mixture which comprises petroleum residuum and its hydrothermal reaction products. Simultaneously, substantial amounts of light products are stripped from the mixture by countercurrent contact with a hydrogen gas stream at elevated temperatures. A gaseous stream comprising the light products is withdrawn and the remaining heavier effluent is contacted in a catalytic reaction zone (35) with a second hydrogen gas stream and externally supplied hydrocracking catalyst at temperatures generally lower than the temperature of the hydrothermal dissolving-stripping zone, a second effluent stream (50) being withdrawn from the hydrocracking zone (35). <IMAGE> |
