| 摘要 |
A process for minimizing hydrogen losses in a high pressure hydrogen contacting system wherein an effluent liquid leaves a contact zone with hydrogen in the presence of less volatile contaminating gases comprises flashing the effluent liquid to yield flashed vapours and returning the recompressed vapours to the contact zone. As applied to a hydrocracking process, vapour from the reactor 26 is taken to absorber 60 in which it is contacted with an oil which absorbs light hydrocarbons, hydrogen sulphide and some hydrogen. The enriched oil is fed to a first flash drum 74 at 1250 p.s.i.g.; vapour from this, containing hydrogen, is recycled to the reactor, and the liquid goes to second flash drum 78 at 20 to 60 p.s.i.g.; vapour from this is used as fuel gas and the liquid is recycled to the absorber. <PICT:1092039/C4-C5/1> Vapours not absorbed in the absorption tower, mostly hydrogen, are also recycled to the reactor. |
