초록 ▼

A process is provided for increasing gasoline octane number and/or total gasoline yield in catalytic cracking units by the addition of a very small amount of finely divided shape selective additive promoter, which additive promoter is not intimately combined with a substantial amount of another soli

A process is provided for increasing gasoline octane number and/or total gasoline yield in catalytic cracking units by the addition of a very small amount of finely divided shape selective additive promoter, which additive promoter is not intimately combined with a substantial amount of another solid prior to contact with the cracking catalyst. The additive promoter, in one embodiment, is a crystalline aluminosilicate zeolite having a silica to alumina mole ratio greater than about 12 and a constraint index within the approximate range of 1 to 12.

대표청구항 ▼

In an improved process for increasing gasoline octane number in catalytic cracking of a hydrocarbon chargestock in the presence of a cracking catalyst comprising an active component and a matrix and under cracking conditions, the improvement which comprises addition to said catalyst of a shape selec

In an improved process for increasing gasoline octane number in catalytic cracking of a hydrocarbon chargestock in the presence of a cracking catalyst comprising an active component and a matrix and under cracking conditions, the improvement which comprises addition to said catalyst of a shape selective additive promoter characterized by a particle size of less than 5 microns, a silica to alumina mole ratio greater than about 12 and a constraint index within the approximate range of 1 to 12, said additive promoter not being intimately combined with a substantial amount of other solid prior to contact thereof with said cracking catalyst and wherein the weight ratio of said additive promoter to the said cracking catalyst is in the range between about 1:10000 and about 1:100.