| 摘要 |
PURPOSE: Provided is catalytic hydrocracking process which provides higher liquid product yields, especially higher yields of turbine oil and diesel oil and which provides the yield advantages associated with a low conversions per pass without an effect of unit economics. CONSTITUTION: The catalytic hydrocracking process comprises the steps of (i) passing a hydrocarbonaceous feedstock, a liquid recycle stream and hydrogen to a denitrification and desulfurization reaction zone containing a catalyst and recovering a denitrification and desulfurization reaction zone effluent therefrom, (ii) passing the denitrification and desulfurization reaction zone effluent to a hydrocracking zone containing hydrocracking catalyst, (iii) passing a resulting effluent from the hydrocracking zone directly to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock, (iv) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock as at least a portion of the liquid stream to the denitrification and desulfurization reaction zone, (v) passing at least a portion of the first vapor stream comprising hydrogen and hydrocarbonaceous compounds from step(iv) into an aromatic saturation zone to reduce the concentration of aromatic compounds, and (vi) passing and cooling the resulting effluent from the aromatic saturation zone in step(v) and at least a portion of the first liquid stream from step(iii) to a vapor-liquid separator to produce a hydrogen-rich gaseous stream and a hydrocracked hydrocarbonaceous product stream.
|
