Mixture of catalysts for cracking naphtha to olefins
AssigneeUop LLC
InventorsGavin P. Towler, Hayim Abrevaya
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Abstract
A process is presented for the selective catalytic cracking of naphtha to light olefins. The process includes contacting a naphtha feedstream with a mixture of catalysts to reduce the amount of recycle, and especially the recycle of light paraffins. The mixture of catalysts includes a first molecular sieve made up from a small pore zeolite having a pore index between 13 and 26, and a second molecular sieve made up from an intermediate pore zeolite having a pore index between 26 and 30.
Claims20
A process for selective catalytic cracking of naphtha to light olefins comprising contacting a naphtha feedstock stream with a combination of catalysts at reaction conditions to control the relative production of ethylene and propylene, the catalyst combination comprising a first molecular sieve catalyst comprising a small pore zeolite having a pore index between 13 and 26, and a second molecular sieve catalyst comprising an intermediate pore zeolite having a pore index between 26 and 30, wherein the first molecular sieve catalyst comprises between 5 and 95 wt % of the catalyst, and the second molecular sieve catalyst comprises the remainder of the catalyst combination, wherein the combination of catalysts is a physical mixture of different catalyst particles.
A process for selective catalytic cracking of naphtha to light olefins having a high propylene fraction comprising contacting a naphtha feedstock stream with a combination of catalysts at reaction conditions to control the relative production of ethylene and propylene, the catalyst combination comprising a first molecular sieve catalyst comprising a small pore zeolite having a pore index between 13 and 26, and a second molecular sieve catalyst comprising an intermediate pore zeolite having a pore index between 26 and 30, wherein the first molecular sieve catalyst comprises between 10 and 50 wt % of the catalyst, and the second molecular sieve comprises between 50 and 90 wt % of the catalyst combination, wherein the combination of catalysts is a physical mixture of at least two catalysts.
Dependencies are inferred from the claim text.