| 摘要 |
1,147,257. Catalytic cracking. MOBIL OIL CORP. 20 Sept., 1967, No. 42864/67. Heading C5E. A catalytic hydrocarbon conversion process comprises passing hydrocarbon vapour through an arranged series of dilute phase riser reactors through which series catalyst passes generally countercurrent to the flow of hydrocarbon vapours but concurrently with hydrocarbon vapour through any one reactor, the temperature at which vapour contacts catalyst in the individual reactors being progressively decreased in the direction of vapour flow through the series of reactors. The reactors may be followed by series of catalyst strippers and regenerators. The feed may be preheated by inert solid or partially pre-cracked by another catalyst in a preliminary stage which may also be provided with strippers and regenerators. |
