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1. WO1993019138 - PROCEDE DE CRAQUAGE CATALYTIQUE A LIT FLUIDE PERMETTANT D'AMELIORER LA FORMATION D'ISOBUTYLENE ET D'ISOAMYLENES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

We claim:
1. A process for the catalytic cracking of a
hydrocarbon charge to produce isobutylene and
isoamylenes which comprises contacting said hydrocarbon charge at cracking temperature in the absence of added hydrogen with a composite fluid catalytic cracking catalyst comprising a non-zeolitic component containing at least 45% by weight A1203 and < 30% Y zeolite having a unit cell size < 24.29 A°, the matrix of said composite catalyst having a BET surface area .> 50 m2/g, said catalyst having a Lewis/Bronsted acid site ratio of > 1.5 wherein the total number of Bronsted sites is < 30 micromoles/g of catalyst, and recovering from the resulting products of conversion a concentrate of isobutylenes and isoamylenes.
2. The process of claim 1 wherein the total number of Bronsted sites is less than 20 micromoles/g of catalyst.

3. The process of claim 1 wherein said catalyst
contains less than 0.3% Na20 on a dry weight basis.
4. The process of claim 1 wherein said catalyst
contains less than 0.1% Na20 on a dry weight basis.
5. The process of claim 1 wherein said catalyst
contains less than 1% REO on a dry weight basis.
6. The process of claim 1 wherein said catalyst is essentially free from rare earth.
7. The process of claim 1 wherein the A1203 content of said non-zeolitic component is selected from the group consisting of alumino-silicate, silica-alumina, mixtures of alumina and silica, and mixtures thereof.
8. The process of claim 1 wherein ZSM-5 is present with said cracking catalyst.
9. The process of claim 1 wherein the unit cell size of said Y zeolite catalyst is less than 24.26 Angstroms.