Hydroprocessing product separation

Claim 2

The process of claim 1 wherein said first liquid phase in step (iv) is cooled to a temperature of about 75* to about 150* F.

Claim 3

The process of claim 1 wherein said first separation zone of step (i) is maintained at a temperature below about 850* F.

Claim 4

The process of claim 4 wherein said temperature is about 700* to about 800* F.

Claim 5

The process of claim 1 wherein said third liquid phase of step (v) is separated in a fourth separation zone at substantially the same temperature as said third separation zone and under a substantially reduced pressure to provide a fourth liquid phase containing normally liquid hydrocarbons and a fourth vapor phase containing normally gaseous compounds.

Claim 6

The process of claim 1 wherein said hydroprocessing is effected at a temperature of about 600* to about 950* F. and a pressure of about 1,000 psig to about 3,500 psig.

Claim 7

The process of claim 1 wherein said charge stock is a distillate boiling within the range of about 400* to about 1, 100* F.

Claim 8

The process of claim 1 wherein said charge stock is a petroleum based residuum having at least 10 percent by volume boiling above 1,050* F.

Claim 9

A process for catalytically hydrocracking a hydrocarbon charge stock boiling above about 400* F. which comprises the steps of: i. contacting, in a catalytic hydrocracking zone said charge stock with hydrogen, at least a portion of which hydrogen is supplied by a hereinafter described hydrogen recycle, and a hydrocracking catalyst at hydrocracking conditions including a pressure of about 1,000 psig to about 3,500 psig, a temperature of about 600* to about 950* F., and a hydrogen to hydrocarbon ratio of about 500 SCF/BBL to 50,000 SCF/BBL; ii. separating the resultant hydrocracking zone effluent in a first separation zone maintained under an elevated temperature and substantially the same pressure as said reaction zone to provide a first liquid phase and a first vapor phase; iii. cooling said vapor phase from said first separation zone at substantially the same pressure as said first separation zone to a temperature of about 75* to about 150* F. to produce a first cooled product; iv. separating said first cooled product from step (iii) in a second separation zone at substantially the same pressure as said first separation zone to provide a hydrogen rich, second vapor phase and a second liquid phase; v. cooling at least a portion of said first liquid phase at substantially the same pressure as said first separation zone to a temperature of about 50* to about 300* F. to produce a second cooled product. vi. separating said second cooled product from step (v) at substantially the same pressure as said first separation zone in a third separation zone to provide a hydrogen rich, third vapor phase and a third liquid phase; and, vii. recycling at least a portion of said hydrogen rich second vapor phase of step (iv) and at least a portion of said hydrogen rich, third vapor phase of step (vi) as said hydrogen recycle to said hydrocracking zone of step (i).

Claim 10

The process of claim 10 wherein said first separation zone of step (ii) is maintained at a temperature below about 850* F.

Claim 11

The process of claim 11 wherein said temperature is about 700* to about 800* F.

Claim 12

The process of claim 10 wherein said third liquid phase of step (vi) is separated in a fourth separation zone at substantially the same temperature as said third separation zone and under a substantially reduced pressure to provide a fourth liquid phase containing normally liquid hydrocarbons and a fourth vapor phase containing normally gaseous compounds.

Claim 13

The process of claim 10 wherein said charge stock is a distillate boiling within the range of 400* to about 1,100* F.

Claim 14

The process of claim 10 wherein said charge stock is a petroleum based residuum having at least 10 percent by volume boiling about 1,050* F.