Xylene Isomerization Process and Catalyst Therefor
First Claim
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1. A process for the isomerization of a paraxylene-depleted aromatic hydrocarbon feedstream comprising at least one of phenol and styrene, wherein said isomerization of a paraxylene-depleted feedstream is conducted in the presence of a catalyst comprising MCM-49 and/or an HZSM-5 catalyst, wherein said HZSM-5 catalyst, if present, is characterized by an average crystal size of <
- 0.1 micron and a SiO2/Al2O3 molar ratio in the range of about 20-100, in a reactor at a temperature of less than 295°
C., and a pressure sufficient to maintain the xylenes in liquid phase.
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Abstract
The invention concerns a xylenes isomerization process for the production of equilibrium or near-equilibrium xylenes from a feedstream comprising phenol and/or styrene.
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15 Claims
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1. A process for the isomerization of a paraxylene-depleted aromatic hydrocarbon feedstream comprising at least one of phenol and styrene, wherein said isomerization of a paraxylene-depleted feedstream is conducted in the presence of a catalyst comprising MCM-49 and/or an HZSM-5 catalyst, wherein said HZSM-5 catalyst, if present, is characterized by an average crystal size of <
- 0.1 micron and a SiO2/Al2O3 molar ratio in the range of about 20-100, in a reactor at a temperature of less than 295°
C., and a pressure sufficient to maintain the xylenes in liquid phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- 0.1 micron and a SiO2/Al2O3 molar ratio in the range of about 20-100, in a reactor at a temperature of less than 295°
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