Process and apparatus for para-xylene production
AssigneeExxonMobil Chemical Patents Inc.
InventorsTimothy F. Kinn, Kevin J. Knob
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Abstract
A process of producing PX comprising providing a C8+ feedstock, the C8+ feedstock has C8 hydrocarbons and C9+ hydrocarbons, to a crystallization unit under crystallization conditions to produce a PX enriched stream having a PX concentration of at least 99.5 wt % based on the weight of the PX enriched stream, wherein the C8+ feedstock has a PX concentration of at least 70 wt % based on total weight of xylenes in the C8+ feedstock, which the C8+ feedstock having a C9+ hydrocarbons concentration in a range from 1 wppm to 10 wt % based on the total weight of the C8+ feedstock.
Claims1
In a process for producing para-xylene comprising toluene methylation to produce a stream comprising C7− hydrocarbons, xylenes, and C9+ hydrocarbons, and then recovery of para-xylene by crystallization, including a step of removal of said C7− hydrocarbons from said stream prior to said crystallization, the improvement comprising the absence a step of removal of C9+ hydrocarbons between said toluene methylation and said crystallization.
Dependencies are inferred from the claim text.