The invention discloses a compounding technology of preparing olefin with
compound C4, which solves the problems that the C4 resource is unable to be fully utilized and the schizolysis separation
cryogenic system has relatively much recycle
hydrogen. The invention is characterized in that the compounding technology takes schizolyzied C4 or refined C4 as
raw material; combines an
ethylene device; combines technologies such as olefin catalyses and schizolysis, hydrogenation and steam thermal schizolysis to respectively process C4olefin and
alkane; the C4 single olefin which comprises no dialkene and
alkyne is transformed into low carbon olefin which mainly comprises propylene through the olefin catalyses and the schizolysis; and the
alkane is transformed into low carbon olefin which mainly comprises
ethylene through steam thermal schizolysis so as to maximally produce the
ethylene and the propylene. The invention has the advantages that the compounding technology fully utilizes the C4 resource, thereby obtaining maximal economic benefit; the expensive schizolysis raw materials, for example
naphtha, are replaced with the cheap refined C4, thereby decreasing the production cost, avoiding the interference of organic
sulfur, decreaseing the load of the
cold area and reducing the
energy consumption.