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Multiple-stage catalyst system for self-metathesis with controlled isomerization and cracking

  • US 10,550,048 B2
  • Filed: 01/17/2018
  • Issued: 02/04/2020
  • Est. Priority Date: 01/20/2017
  • Status: Active Grant
First Claim
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1. A multiple-stage catalyst system for producing propylene from a hydrocarbon stream comprising 2-butene, the multiple-stage catalyst system comprising an isomerization catalyst zone, a metathesis catalyst zone downstream of the isomerization zone, and a cracking catalyst zone downstream of the metathesis catalyst zone where:

  • the isomerization catalyst zone comprises a silica-alumina catalyst with a ratio by weight of alumina to silica from 1;

    99 to 20;

    80, where the silica-alumina catalyst zone isomerizes the 2-butene to 1-butene;

    the metathesis catalyst zone comprises a mesoporous silica catalyst support impregnated with metal oxide to form a mesoporous silica catalyst, where the mesoporous silica catalyst zone cross-metathesizes the 2-butene and 1-butene into a metathesis product stream comprising propylene and C4-C6 olefins;

    the cracking catalyst zone comprises a mordenite framework inverted (MFI) structured silica catalyst, where the cracking catalyst zone cracks the metathesis product stream to produce propylene; and

    the MFI structured catalyst is directly downstream of the mesoporous silica catalyst such that the metathesis product stream is passed directly from the mesoporous silica catalyst to the MFI structured silica catalyst.

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