Process to prepare propylene
AssigneeGasolfin B.V.
InventorHubertus Wilhelmus Albertus Dries
Life of this patent
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Abstract
The invention is directed to a process to prepare propylene from a mixture of hydrocarbons by performing the following steps. (a) extracting aromatics from the mixture of hydrocarbons thereby obtaining a mixture of hydrocarbons poor in aromatics, (b) contacting the mixture obtained in step (a) with a heterogeneous cracking catalyst as present in a fixed bed thereby obtaining a cracked effluent, (c) separating propylene from the cracked effluent thereby also obtaining a higher boiling fraction, (d) recycling part of the higher boiling fraction to step (b) and at least 5 wt % of the higher boiling fraction to step (a).
Claims18
A process to prepare propylene from a mixture of hydrocarbons by performing the following steps:
- (a) extracting aromatics from the mixture of hydrocarbons thereby obtaining a resulting mixture of hydrocarbons poor in aromatics,
- (b) contacting the resulting mixture obtained in step (a) with a mixture of a heterogenous cracking catalyst and a heterogeneous dehydrogenation catalyst in a fixed bed thereby obtaining a cracked effluent,
- (c) separating propylene from the cracked effluent thereby also obtaining a higher boiling fraction, and
- (d) recycling a first recycle stream comprising between 10 and 30 wt % of the higher boiling fraction to step (a) and a second recycle stream comprising a portion of the higher boiling fraction to step (b), wherein the first recycle stream and the second recycle stream each comprise aromatic compounds originating from the higher boiling fraction.
Dependencies are inferred from the claim text.