Process for producing propylene and aromatics from butenes by metathesis and aromatization

A process for producing propylene and aromatics comprising:

• a) reacting in a metathesis reactor a hydrocarbon feed mixture comprising 1-butene, 2-butene and, optionally, isobutene in the presence of a metathesis catalyst at conditions to produce a product comprising ethylene, propylene, product butenes, pentenes, hexenes and higher olefins;
• b1) separating from the product and recycling to the metathesis reactor the pentenes, the butenes, and optionally, the ethylene;
• b2) separating the propylene from the product;
• b3) separating the hexenes and higher olefins from the product;
• and
• c) reacting the hexenes and higher olefins to aromatics in the presence of an aromatization catalyst, wherein the aromatization catalyst is Pt/CsGeZSM-5, Pt/KGeZSM-5 or Pt/KZSM-5,wherein greater than or equal to 86% aromatic selectivity is achieved;
• wherein in step a) the molar ratio of 1-butene:2-butene in the hydrocarbon feed is in the range of from about 1:6 to about 6:1.

A process for producing propylene and aromatics comprising:

• a) reacting in a metathesis reactor a hydrocarbon feed mixture comprising 1-butene, 2-butane and, optionally, isobutene in the presence of a metathesis catalyst at conditions to produce a product comprising ethylene, propylene, product butenes, pentenes, hexenes and higher olefins;
• b1) separating from the product and recycling to the metathesis reactor the pentenes, the butenes, and optionally, the ethylene;
• b2) separating the propylene from the product;
• b3) separating the hexenes and higher olefins from the product;
• and
• c) reacting 3-hexene and higher olefins to aromatics in the presence of an aromatization catalyst, wherein the aromatization catalyst is Pt/CsGeZSM-5, Pt/KGeZSM-5 or Pt/KZSM-5,
• wherein in step a) the molar ratio of 1-butene:2-butene in the hydrocarbon feed is in the range of from about 1:6 to about 6:1.