Process and apparatus for treating mercaptans

Patent metadata

Field	Value
Publication number	US-10731090-B2
Application number	US-201816045351-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Apr 14, 2016
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

Processes and apparatuses are disclosed for treating a naphtha stream from a FCC unit comprising passing the naphtha stream to a naphtha splitter column to provide a light naphtha stream and a heavy naphtha stream. The light naphtha stream is reacted in a mercaptan oxidation reactor to provide a demercaptanized naphtha stream. The demercaptanized naphtha stream is stripped in a light stripper column to provide a treated light naphtha stream and a bottoms stream.

First claim

The invention claimed is:

1. A process for treating a naphtha stream from a FCC unit, wherein the process comprises:
reacting a light naphtha stream in a mercaptan oxidation reactor to provide a demercaptanized naphtha stream; and
stripping the demercaptanized naphtha stream in a light stripper column to provide a treated light naphtha stream and a bottoms stream.

2. The process of claim 1 further comprising providing an alkaline stream to the light naphtha stream to the mercaptan oxidation reactor, wherein the alkaline stream comprises one of caustic or ammonia.

3. The process of claim 1 further comprising passing a full range naphtha stream to a naphtha splitter column to provide the light naphtha stream and a heavy naphtha stream.

4. The process of claim 3 further comprising passing the heavy naphtha stream and the bottoms stream from the light stripper column to a hydrodesulfurization reactor to hydrodesulfurize the heavy naphtha stream and the bottoms stream.

5. The process of claim 4 further comprising passing the heavy naphtha stream through a di-olefin saturation reactor prior to passing the heavy naphtha stream through the hydrodesulfurization reactor.

6. The process of claim 4 further comprising passing a hydrodesulfurized naphtha stream from the hydrodesulfurization reactor to a heavy stripper column to provide a heavy stripper overhead stream and a treated heavy naphtha stream.

7. The process of claim 6 further comprising passing the heavy stripper overhead stream to the light stripper column.

8. The process of claim 4 further comprising passing a hydrodesulfurized naphtha stream from the hydrodesulfurization reactor to a separator to provide a liquid hydrodesulfurized naphtha stream and passing the liquid hydrodesulfurized naphtha stream to the heavy stripper column to provide the heavy stripper overhead stream and the treated heavy naphtha stream.

9. A process for treating a naphtha stream from a FCC unit, wherein the process comprises:
passing the naphtha stream to a naphtha splitter column to provide a light naphtha stream and a heavy naphtha stream;
reacting the light naphtha stream in a mercaptan oxidation reactor to provide a demercaptanized naphtha stream; and
stripping the demercaptanized naphtha stream in a light stripper column to provide a treated light naphtha stream and a bottoms stream.

10. The process of claim 9 further comprising providing an alkaline stream to the light naphtha stream to the mercaptan oxidation reactor, wherein the alkaline stream comprises one of caustic or ammonia.

11. The process of claim 9 further comprising passing the heavy naphtha stream and the bottoms stream from the light stripper column to a hydrodesulfurization reactor to hydrodesulfurize the heavy naphtha stream and the bottoms stream.

12. The process of claim 11 further comprising passing the heavy naphtha stream through a di-olefin saturation reactor prior to passing the heavy naphtha stream through the hydrodesulfurization reactor.

13. The process of claim 11 further comprising passing a hydrodesulfurized naphtha stream from the hydrodesulfurization reactor to a heavy stripper column to provide a heavy stripper overhead stream and a treated heavy naphtha stream.

14. The process of claim 11 further comprising passing a hydrodesulfurized naphtha stream from the hydrodesulfurization reactor to a separator to provide a liquid hydrodesulfurized naphtha stream and passing the liquid hydrodesulfurized naphtha stream to the heavy stripper column to provide the heavy stripper overhead stream and the treated heavy naphtha stream.

Assignees

• Uop Llc

Inventors

• Pahwa Piyush
• Munjal Amit

Classifications

• C10G53/14

  including at least one oxidation step · CPC title

• C10G27/04

  with oxygen or compounds generating oxygen · CPC title

• C10G19/02

  with aqueous alkaline solutions · CPC title

• C10G2400/04

  Diesel oil · CPC title

• C10G27/06

  in the presence of alkaline solutions · CPC title