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US 8,507,744 B2Granted
Process for the purification of paraxylene
AssigneeExxonMobil Chemical Patents Inc.
InventorsMark Paul Hagemeister, David Lee Johnson, John Joseph Monson
Life of this patent
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Abstract
The proposed process uses crystallization technology to purify paraxylene simultaneously of large concentrations of C8 aromatics and also small concentrations of oxygenated species.
Claims9
A process for the production of para-xylene comprising:
- reacting toluene with methanol under alkylation conditions in the presence of a catalyst suitable for the production of a product comprising para-xylene and oxygenates to produce a first product comprising para-xylene and oxygenates, and then, without any intervening treatment, subjecting said product to purification by crystallization to produce a paraxylene fraction said paraxylene fraction characterized by a BI of 30 or less and having a lower amount of oxygenate impurities than said first product.
Dependencies are inferred from the claim text.