Processes for removing contaminants from a dehydrogenation effluent

Patent metadata

Field	Value
Publication number	US-9962682-B2
Application number	US-201615346619-A
Country	US
Kind code	B2
Filing date	Nov 8, 2016
Priority date	Jun 1, 2015
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A process for the providing a regenerant gas stream for a regenerable adsorbent used to remove water and hydrogen sulfide from a reactor effluent in a catalytic dehydrogenation process is described. The reactor effluent is compressed in a compressor to provide a compressed effluent. The compressed effluent may be treated to remove chlorides, and then passed to a dryer zone having a regenerable adsorbent. A regenerant gas stream is used to desorb the water and hydrogen sulfide and the spent regenerant stream may be passed to a cleaning zone having a sorbent configured to remove hydrogen sulfide from the spent regenerant stream. The cleaned regenerant gas stream may be recycled to the dryer zone to desorb and/or regenerate the regenerable adsorbent.

First claim

The invention claimed is:

1. A process for cleaning a spent regenerant stream, the process comprising:
removing water and hydrogen sulfide from a reactor effluent stream in a first zone;
regenerating a regenerable adsorbent in the first zone with a regenerant gas stream to provide a spent regenerant stream, the spent regenerant stream including water and hydrogen sulfide from the first zone;
removing the hydrogen sulfide from the spent regenerant stream in a second zone comprising a regenerant cleaning zone to provide a cleaned regenerant stream, the regenerant cleaning zone including one or more vessels having a solid adsorbent including a metal oxide configured to selectively immobilize hydrogen sulfide; and,
regenerating a regenerable adsorbent with at least a portion of the cleaned regenerant stream.

2. The process of claim 1 wherein regenerable adsorbent that is regenerating with the at least a portion of the cleaned regenerant stream is in the first zone.

3. The process of claim 1 further comprising:
cooling the cleaned regenerant stream before regenerating the regenerable adsorbent with the cleaned regenerant stream.

4. The process of claim 1 further comprising:
removing water from the cleaned regenerant stream before regenerating the regenerable adsorbent with the cleaned regenerant stream.

5. The process of claim 1 further comprising:
passing the cleaned regenerant stream to a hydrocarbon removal zone before regenerating the regenerable adsorbent with the cleaned regenerant stream.

6. The process of claim 1 further comprising:
cooling the spent regenerant stream.

7. The process of claim 6 wherein the spent regenerant stream is cooled in the regenerant cleaning zone.

8. A process for cleaning a spent regenerant stream, the process comprising:
removing water and hydrogen sulfide from a reactor effluent stream in a first zone, the reactor effluent stream including olefins;
regenerating a regenerable adsorbent in the first zone with a regenerant gas stream to provide a spent regenerant stream, the spent regenerant stream including water and hydrogen sulfide from the first zone;
removing the hydrogen sulfide from the spent regenerant stream in a second zone comprising a regenerant cleaning zone to provide a cleaned regenerant stream, the regenerant cleaning zone including one or more vessels having a solid adsorbent including a metal oxide configured to selectively immobilize hydrogen sulfide, the second zone different than the first zone; and,
regenerating a regenerable adsorbent in the first zone with at least a portion of the cleaned regenerant stream.

9. The process of claim 8 further comprising:
cooling the cleaned regenerant stream before regenerating the regenerable adsorbent.

10. The process of claim 8 further comprising:
removing water from the cleaned regenerant stream before regenerating the regenerable adsorbent with the cleaned regenerant stream.

11. The process of claim 8 further comprising:
passing the cleaned regenerant stream to a hydrocarbon removal zone before regenerating the regenerable adsorbent with the cleaned regenerant stream.

12. The process of claim 8 further comprising:
cooling the spent regenerant stream.

13. The process of claim 12 wherein the spent regenerant stream is cooled in the regenerant cleaning zone.

Assignees

• Uop Llc

Inventors

• Kanazirev Vladislav I
• Gorawara Jayant K
• Zimmermann Joseph E

Classifications

• B01D2259/402

  using two beds · CPC title

• B01D2257/304

  Hydrogen sulfide · CPC title

• B01J20/3433

  of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425 · CPC title

• B01D53/82

  with stationary reactants · CPC title

• B01D2259/40086

  by using a purge gas (B01D2259/4009 takes precedence) · CPC title