Process for xylene and ethylbenzene isomerization using UZM-35HS
AssigneeUop LLC
InventorsPaula L Bogdan, Deng-Yang Jan, Christopher P Nicholas, Jaime G Moscoso
Life of this patent
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Abstract
Xylene and ethylbenzene isomerization process is catalyzed by the UZM-35 family of crystalline aluminosilicate zeolites represented by the empirical formula: Mmn+Rr+Al(1-x)ExSiyOz where M represents a combination of potassium and sodium exchangeable cations, R is a singly charged organoammonium cation such as the dimethyldipropylammonium cation and E is a framework element such as gallium. These UZM-35 zeolites are active and selective in the isomerization of xylenes and ethylbenzene.
Claims22
A process for isomerizing a non-equilibrium feed mixture comprising xylenes and ethylbenzene comprising contacting the feed mixture in the presence of hydrogen in an isomerization zone with a catalyst at isomerization conditions and producing an isomerized product comprising a higher proportion of p-xylene than in the feed mixture, wherein the catalyst comprises a UZM-35HS microporous crystalline zeolite and a hydrogenation component, wherein the UZM-35HS has a three-dimensional framework of at least AlO2 and SiO2 tetrahedral units and an empirical composition on an anhydrous basis expressed by an empirical formula of:
- M1an+Al(1-x)ExSiy′Oz′
- where M1 is at least one exchangeable cation selected from the group consisting of alkali, alkaline earth metals, rare earth metals, ammonium ion, hydrogen ion and mixtures thereof, “a” is the mole ratio of M1 to (Al+E) and varies from about 0.05 to about 50, “n” is the weighted average valence of M1 and has a value of about +1 to about +3, E is an element selected from the group consisting of gallium, iron, boron, and mixtures thereof, “x” is the mole fraction of E and varies from 0 to 1.0, y′ is the mole ratio of Si to (Al+E) and varies from greater than about 4 to virtually pure silica and z′ is the mole ratio of O to (Al+E) and has a value determined by the equation:
- z′=(a·n+3+4·y′)/2
- and is characterized in that it has the x-ray diffraction pattern having at least the d-spacings and intensities set forth in Table A:
- TABLE A
- 2θ
- d (Å)
- I/Io %
- 6.45-6.8
- 13.7-13
- m
- 6.75-7.13
- 13.1-12.4
- m-vs
- 7.86-8.26
- 11.25-10.7
- m
- 8.64-9.04
- 10.23-9.78
- m
- 9.51-10.09
- 9.3-8.77
- m-vs
- 10.62-11.23
- 8.33-7.88
- w-m
- 13.4-14.22
- 6.61-6.23
- w-m
- 14.76-15.55
- 6-5.7
- w
- 17.63-18.37
- 5.03-4.83
- m
- 19.17-19.91
- 4.63-4.46
- w-m
- 19.64-20.56
- 4.52-4.32
- m
- 20.18-21.05
- 4.4-4.22
- w-m
- 20.7-21.57
- 4.29-4.12
- w-m
- 21.36-22.28
- 4.16-3.99
- vs
- 22.17-23.6
- 4.01-3.77
- m-s
- 24.12-25.23
- 3.69-3.53
- w
- 25.6-26.94
- 3.48-3.31
- m
- 26.37-27.79
- 3.38-3.21
- m
- 27.02-28.42
- 3.3-3.14
- m
- 27.53-28.89
- 3.24-3.09
- m
- 28.7-30.09
- 3.11-2.97
- m
- 29.18-30.72
- 3.06-2.91
- w-m
- 30.19-31.73
- 2.96-2.82
- m
- 30.83-32.2
- 2.9-2.78
- w
- 32.81-34.22
- 2.73-2.62
- w
- 35.63-36.99
- 2.52-2.43
- w
- 41.03-42.86
- 2.2-2.11
- w
- 44.18-45.83
- 2.05-1.98
- w
- 44.87-46.57
- 2.02-1.95
- w
- 46.07-47.35
- 1.97-1.92
- w
- 48.97-50.42
- 1.86-1.81
- w
- and is thermally stable up to a temperature of at least 400° C.
A process for isomerizing a non-equilibrium feed mixture comprising xylenes and ethylbenzene comprising contacting the feed mixture in the presence of hydrogen in an isomerization zone with a catalyst at isomerization conditions and producing an isomerized product comprising a lower proportion of ethylbenzene than in the feed mixture, wherein the catalyst comprises a UZM-35HS microporous crystalline zeolite and a hydrogenation component, wherein the UZM-35HS has a three-dimensional framework of at least AlO2 and SiO2 tetrahedral units and an empirical composition on an anhydrous basis expressed by an empirical formula of:
- M1an+Al(1-x)ExSiy′Oz′
- where M1 is at least one exchangeable cation selected from the group consisting of alkali, alkaline earth metals, rare earth metals, ammonium ion, hydrogen ion and mixtures thereof, “a” is the mole ratio of M1 to (Al+E) and varies from about 0.05 to about 50, “n” is the weighted average valence of M1 and has a value of about +1 to about +3, E is an element selected from the group consisting of gallium, iron, boron, and mixtures thereof, “x” is the mole fraction of E and varies from 0 to 1.0, y′ is the mole ratio of Si to (Al+E) and varies from greater than about 4 to virtually pure silica and z′ is the mole ratio of O to (Al+E) and has a value determined by the equation:
- z′=(a·n+3+4·y′)/2
- and is characterized in that it has the x-ray diffraction pattern having at least the d-spacings and intensities set forth in Table A:
- TABLE A
- 2θ
- d (Å)
- I/Io %
- 6.45-6.8
- 13.7-13
- m
- 6.75-7.13
- 13.1-12.4
- m-vs
- 7.86-8.26
- 11.25-10.7
- m
- 8.64-9.04
- 10.23-9.78
- m
- 9.51-10.09
- 9.3-8.77
- m-vs
- 10.62-11.23
- 8.33-7.88
- w-m
- 13.4-14.22
- 6.61-6.23
- w-m
- 14.76-15.55
- 6-5.7
- w
- 17.63-18.37
- 5.03-4.83
- w
- 19.17-19.91
- 4.63-4.46
- w-m
- 19.64-20.56
- 4.52-4.32
- m
- 20.18-21.05
- 4.4-4.22
- w-m
- 20.7-21.570
- 4.29-4.12
- w-m
- 21.36-22.28
- 4.16-3.99
- vs
- 22.17-23.6
- 4.01-3.77
- m-s
- 24.12-25.23
- 3.69-3.53
- w
- 25.6-26.94
- 3.48-3.31
- m
- 26.37-27.79
- 3.38-3.21
- m
- 27.02-28.42
- 3.3-3.14
- m
- 27.53-28.89
- 3.24-3.09
- m
- 28.7-30.09
- 3.11-2.97
- m
- 29.18-30.72
- 3.06-2.91
- w-m
- 30.19-31.73
- 2.96-2.82
- m
- 30.83-32.2
- 2.9-2.78
- w
- 32.81-34.22
- 2.73-2.62
- w
- 35.63-36.99
- 2.52-2.43
- w
- 41.03-42.86
- 2.2-2.11
- w
- 44.18-45.83
- 2.05-1.98
- w
- 44.87-46.57
- 2.02-1.95
- w
- 46.07-47.35
- 1.97-1.92
- w
- 48.97-50.42
- 1.86-1.81
- w
- and is thermally stable up to a temperature of at least 400° C.
Dependencies are inferred from the claim text.