Discrete molecular sieve and use
AssigneeUop LLC
InventorsHermant W. Dandekar, David A. Lesch, Thomas M. Reynolds, Robert L. Patton, Stephen T. Wilson, Gregory J. Gajda
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Abstract
This invention presents a novel MgAPSO molecular sieve, containing a critical range of magnesium in the sieve framework and having a small crystallite size, which is particularly active for hydrocarbon conversion. The sieve advantageously is incorporated, along with a platinum-group metal, into a catalyst formulation which is useful for isomerization. When utilized in a process for isomerizing a non-equilibrium mixture of xylenes containing ethylbenzene, a greater yield of para-xylene is obtained compared to prior-art processes.
Claims10
A hydrocarbon-conversion process which comprises contacting a hydrocarbon feedstock, at hydrocarbon-conversion conditions, with a catalytic composition comprising a MgAPSO molecular sieve, said sieve comprising from about 0.003 to 0.035 mol fraction of magnesium in the microporous crystalline framework structure and having an average crystallite diameter of between about 0.5 and 1.5 microns, to obtain a converted product.
A process for the isomerization of a non-equilibrium feed mixture of xylenes and ethylbenzene comprising contacting the feed mixture in the presence of hydrogen in an isomerization zone at alkylaromatic-isomerization conditions with a catalytic composition comprising at least one platinum-group metal component and MgAPSO-31 molecular sieve, said sieve comprising from about 0.003 to 0.035 mol fraction of magnesium in the microporous crystalline framework structure and having an average crystallite diameter of between about 0.5 and 1.5 microns, to produce an isomerized product.
Dependencies are inferred from the claim text.