Production of high octane gasoline

Claim 2

A process for the production of high octane gasoline having an octane number not less than 87 (RON+0), comprising contacting a substantially dealkylated feedstock with a crystalline silicate zeolite having a Constraint Index less than 2, said substantially dealkylated feedstock containing not less than 50 vol % aromatic content and not greater than 12.5 wt % hydrogen content, said contacting being conducted at hydrogen partial pressure not greater than 1000 psig, temperatures not less than 700° F., and a percentage conversion per pass to 385° F. end point gasoline not greater than 50%, wherein said percentage conversion per pass is numerically no greater than 0.05 times the hydrogen partial pressure.

Claim 3

The process according to claim 1, wherein said contacting is conducted at total pressures not greater than 800 psig.

Claim 4

The process according to claim 1, wherein said contacting is conducted at total pressures not greater than 600 psig.

Claim 5

The process according to claim 1, wherein said zeolite is selected from the group consisting of the structures of Mordenite, faujasite, Zeolite Y, ZSM-3, ZSM-4, ZSM-18, ZSM-20 and Zeolite Beta.

Claim 6

The process according to claim 4, wherein said zeolite has an alpha value not less than 1.

Claim 7

The process according to claim 5, wherein said zeolite comprises at least one hydrogenation component selected from the group consisting of tungsten, vanadium, zinc, molybdenum, rhenium, nickel, cobalt, chromium, manganese, platinum, palladium and mixtures thereof.

Claim 8

The process according to claim 5, wherein said zeolite comprises between 0.1 and 25 wt % of at least one hydrogenation component selected from the group consisting of mixtures of nickel/tungsten, mixtures of nickel/molybdenum, and mixtures of cobalt/molybdenum.

Claim 9

The process according to claim 1, wherein said substantially dealkylated feedstock is selected from the group consisting of light cycle oils from catalytic cracking, liquid products from a delayed coking process, and liquid products from a fluid bed coking process.

Claim 10

The process according to claim 1, wherein said substantially dealkylated feedstock is light cycle oil.

Claim 11

The process according to claim 1, wherein said substantially dealkylated feedstock further comprises an API gravity between 5 and 25, a nitrogen content between 50 and 650 ppm, and a hydrogen content between 8.5 and 12.5 wt %.

Claim 12

The process according to claim 1, wherein said contacting is conducted at LHSV between 0.25 and 2.5.

Claim 13

The process according to claim 1, further comprising hydrotreating said substantially dealkylated feedstock prior to said contacting with said zeolite under hydrotreating conditions sufficient to remove at least a portion of the sulfur and nitrogen compounds from said feedstock.

Claim 14

The process according to claim 12, wherein said hydrotreating catalyst comprises a hydrogenation/dehydrogenation metal on a support and said hydrotreating conditions include a pressure not greater than 1200 psig, LHSV between 0.25 and 5, and temperatures between 600° and 800° F.

Claim 15

The process according to claim 1, further comprising passing the unconverted, upgraded bottom fraction resulting from contacting said substantially dealkylated feedstock with said crystalline silicate zeolite to a fluid catalytic cracking unit.

Claim 16

The process according to claim 14, wherein said unconverted, upgraded bottom fraction is stripped of gases and distilled prior to passing to said fluid catalytic cracking unit.

Claim 17

The process according to claim 14, wherein said unconverted, upgraded bottom fraction is 385° F.+ light cycle oil.

Claim 18

The process according to claim 1, wherein, prior to contacting with said zeolite, said substantially dealkylated feedstock is fractionated into a heavy higher boiling stream and a lighter lower boiling stream, wherein said lighter lower boiling stream is contacted with a hydrotreating catalyst comprising a hydrogenation/dehydrogenation metal on a support, under hydrotreating conditions, including a pressure not greater than 1200 psig, LHSV between 0.25 and 5, and temperture between 600° and 800° F. to produce a hydrotreated product.

Claim 19

The process according to claim 17, wherein said heavy higher boiling stream is admixed with a virgin straight run light gas oil and hydrotreated with a hydrotreating catalyst comprising a hydrogenation/dehydrogenation metal on a support, said hydrotreating conditions including a pressure not greater than 1200 psig, LHSV between 0.25 and 5, and temperature between 600° and 800° F., said hydrotreated heavy higher boiling stream further being admixed with the unconverted portion of said lighter lower boiling stream.

Claim 20

The process according to claim 18, wherein said mixture of said hydrotreated heavy higher boiling stream and said unconverted portion of said lighter lower boiling stream is passed to an FCC unit.

Claim 21

A process for the production of a high octane gasoline, having an octane number not less than 87 (RON+0), from a substantially dealkylated hydrocarbn feedstock comprising not less than 50 vol % aromatic content, an API gravity between 5 and 25, a nitrogen content between 50 and 650 ppm, and a hydrogen content between 8.9 and 12.5 wt %, comprising: hydrotreating said substantially dealkylated feedstock in the presence of a hydrotreating catalyst comprising a hydrogenation/dehydrogenation metal on a support, under hydrotreating conditions, including a pressure not greater than 1200 psig, LHSV between 0.25 and 5, and temperature between 600° and 800° F.; contacting said hydrotreated substantially dealkylated feedstock with a crystalline silicate zeolite having a Constraint Index less than 2, said contacting being conducted at hydrogen partial pressure between 600 and 1000 psi, temperatures not less than 700° F., LHSV between 0.25 and 2.5, and a conversion per pass to 385° F. end point gasoline no greater than 50% to form a product comprising a 385° F. end point gasoline and an unconverted, upgraded bottom fraction; and passing said unconverted, upgraded bottom fraction to an FCC unit for further processing.

Claim 22

A process for the production of a high octane gasoline, having an octane number not less than 87 (RON+0), from a substantially dealkylated hydrocarbn feedstock comprising not less than 50 vol % aromatic content, an API gravity between 5 and 25, a nitrogen content between 50 and 650 ppm, and a hydrogen content between 8.9 and 12.5 wt %, comprising: hydrotreating said substantially dealkylated feedstock in the presence of a hydrotreating catalyst comprising a hydrogenation/dehydrogenation metal on a support, under hydrotreating conditions, including a pressure not greater than 1200 psig, LHSV between 0.25 and 5, and temperature between 600° and 800° F.; contacting said hydrotreated substantially dealkylated feedstock with a crystalline silicate zeolite having a Constraint Index less than 2, said contacting being conducted at hydrogen partial pressure between 600 and 1000 psi, temperatures not less than 700° F., LHSV between 0.25 and 2.5, and a conversion per pass to 385° F. end point gasoline no greater than 50% to form a product comprising a 385° F. end point gasoline and an unconverted, upgraded bottom fraction; and passing said unconverted, upgraded bottom fraction to an FCC unit for further processing.

Claim 23

The process according to claim 20, wherein said unconverted, upgraded stream is 385° F.+ light cycle oil.

Claim 24

The process according to claim 20, wherein said substantially dealkylated feedstock is a product of said FCC unit, such that said process is a cyclic process.

Claim 25

The process according to claim 1, wherein said contacting is conducted at a hydrogen partial pressure not less than 600 psig.