MULTI-STEP CONVERSION PROCESS FOR CHARGE CONTAINING OLEFINS WITH FOUR, FIVE, OR MORE CARBON ATOMS IN ORDER TO PRODUCE PROPYLENE (OPTIONS) Russian patent published in 2007 - IPC C07C11/06 C07C2/12 C07C4/06 

FIELD: petrochemical processes.

SUBSTANCE: at least one-step oligomerization (step b) is carried out or this oligomerization is carried out in two steps: limited oligomerization b1 and final oligomerization b3, wherein catalytic oligomerization of olefins having 4 carbon atoms is carried out in presence of other olefins also contained in charge, these other olefins belonging to group consisting, on one hand, of ethylene and, on the other hand, of C5- or C6-olefins to produce oligomers. Further, in step d, at least part of oligomers obtained is subjected to catalytic cracking in reactor differing from oligomerization reactor to produce, in particular, propylene. Process also allows fixed-, moving-, and fluidized-bed cracking to be performed and additional oligomers to be possibly obtained.

EFFECT: optimized yield, conversion, and propylene selectivity.

19 cl, 2 dwg, 5 tbl, 3 ex