METHOD OF PRODUCING PROPYLENE Russian patent published in 2017 - IPC C07C6/04 C07C11/06 C07C7/04 

FIELD: chemistry.

SUBSTANCE: method is to feed the metathesis reaction stream containing ethylene with butene in the presence of the first metathesis catalyst by the first metathesis reaction to form the product stream of the first metathesis containing propylene, ethylene, butene, and olefins _C5 ; allocating of, at least, a part of propylene and ethylene from the product stream of the first metathesis to form the first upper stream and the first propene stripping bottom stream containing butene and olefins _C5 ; reacting of, at least, a portion of the first propene stripping bottom stream with ethylene in the presence of the second metathesis catalyst by the second metathesis reaction to form the product stream of the second metathesis containing propylene, ethylene, butene, and olefins _C5 ; and allocating of, at least, a portion of propylene and ethylene from the stream of the second metathesis to form the second upper stream; and recovering propylene from the first upper stream, the second upper stream or their combinations. Herewith the first metathesis reaction occurs at the first correlation of ethylene: butene of 0.3:1 to 3:1, and the second metathesis reaction occurs at the second correlation of ethylene: butene of 2.0: 1 to 10:1.

EFFECT: increased degree of the butene conversion to propylene.

14 cl, 2 tbl, 1 dwg