Process and apparatus for recovering hydrotreated hydrocarbons with two strippers

Patent metadata

Field	Value
Publication number	US-2016348013-A1
Application number	US-201514726956-A
Country	US
Kind code	A1
Filing date	Jun 1, 2015
Priority date	Jun 1, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A process and apparatus is disclosed for recovering hydrotreating effluent from a hydrotreating unit utilizing a hot stripper and a cold stripper. Only the hot hydrotreating effluent is heated in a fired heater prior to product fractionation, resulting in substantial operating and capital savings. The cold stripped stream from the cold stripper bottoms line may be passed directly to a diesel pool when VGO is hydrotreated in the hydrotreating reactor bypassing the product fractionation column.

First claim

1 . A hydrotreating process comprising:
hydrotreating a hydrocarbon feed stream in a hydrotreating reactor to provide hydrotreating effluent stream; separating said hydrotreating effluent stream into a cold separator stream and a hot separator stream. stripping said cold separator stream in a cold stripper column to provide a cold stripped stream; stripping said hot separator stream in a hot stripper column to provide a hot stripped stream; fractionating said hot stripped stream in a product fractionation column; and bypassing said cold stripped stream around said product fractionation column.

2 . The hydrotreating process of claim 1 further comprising passing said cold stripped stream to a diesel pool.

3 . The hydrotreating process of claim 1 wherein said hydrotreating reactor is a hydrotreating reactor containing a hydrotreating catalyst.

4 . The hydrotreating process of claim 1 further comprising operating said product fractionation column at below atmospheric pressure.

5 . The hydrotreating process of claim 1 further comprising transporting an entirety of said hot stripped stream directly to said product fractionation column.

6 . The hydrotreating process of claim 2 further comprising recycling a condensed overhead stream from said product fractionation column to said cold stripper column.

7 . The hydrotreating process of claim 1 wherein said hydrocarbon feed stream is a VGO stream.

8 . The hydrotreating process of claim 7 further comprising stripping an overhead stream of said hot stripper column in said cold stripper column.

9 . The hydrotreating process of claim 1 further comprising heating said hot stripped stream in a fired heater before fractionating said hot stripped stream.

10 . The hydrotreating process of claim 1 wherein said hot separator stream is of a higher temperature than said cold separator stream.

11 . A hydrotreating process comprising:
hydrotreating a hydrocarbon feed stream in a hydrotreating reactor to provide hydrotreating effluent stream; separating said hydrotreating effluent stream into a cold separator stream and a hot separator stream. stripping said cold separator stream in a cold stripper column to provide a cold stripped stream; stripping said hot separator stream in a hot stripper column to provide a hot stripped stream; fractionating said hot stripped stream in a product fractionation column; and passing said cold stripped stream around said product fractionation column to a diesel pool.

12 . The hydrotreating process of claim 11 further comprising operating said product fractionation column at below atmospheric pressure.

13 . The hydrotreating process of claim 11 further comprising transporting said hot stripped stream directly to said product fractionation column.

14 . The hydrotreating process of claim 11 further comprising transporting said cold stripped stream directly to said diesel pool.

15 . The hydrotreating process of claim 11 further comprising stripping an overhead stream of said hot stripper column in said cold stripper column.

16 . An apparatus for hydrotreating comprising:
a hydrotreating reactor; a separation section in communication with said hydrotreating reactor; a cold stripper column in communication with said separation section; a hot stripper column in communication with said separation section; a product fractionation column in communication with said hot stripper column via a hot stripped line; and a cold stripped line from a bottom of said cold stripper column bypassing said product fractionation column.

17 . The apparatus of claim 16 further comprising a diesel pool in communication with said cold stripped line.

18 . The apparatus of claim 16 wherein said product fractionation column is a vacuum column.

19 . The apparatus of claim 16 wherein said hydrotreating reactor is a hydrotreating reactor.

20 . The apparatus of claim 16 wherein said cold stripper column is in downstream communication with said product fractionation column.

Assignees

• Uop Llc

Inventors

• Ladkat Kiran
• Hoehn Richard K
• Mahajan Hemant

Classifications

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title

• C10G67/02 Primary

  plural serial stages only · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title

• C10G2300/1074

  Vacuum distillates · CPC title

• C10G2400/02

  Gasoline · CPC title