Catalytic reforming processes

Patent metadata

Field	Value
Publication number	US-9683179-B2
Application number	US-201615178412-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Jun 16, 2015
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Processes for catalytic reforming in which a cracking inhibitor, such as an olefin, or a light olefin, is used to inhibit thermal cracking of larger hydrocarbons in non-reactive zones. The cracking inhibitor may be added at various positions through the processes, such as in the recycle gas stream, before a heater, before a stream is passed into a reforming zone, after an effluent stream is recovered from a reforming zone. A molar ratio of cracking inhibitor to hydrocarbons in stream may be between 0.01 and 0.2.

First claim

The invention claimed is:

1. A process for reducing the thermal cracking in a catalytic reforming unit, the process comprising:
heating a feed stream comprising hydrocarbons in a first heating zone and passing the feed stream from the first heating zone to a first reforming zone;
reforming the hydrocarbons in the feed stream in the first reforming zone, the first reforming zone having catalyst and being configured to provide a reformate effluent stream;
recovering the reformate effluent stream from the first reforming zone;
mixing the reformate effluent stream with a light olefin stream as a cracking inhibitor to reduce thermal cracking of hydrocarbons before the reformate effluent stream is passed to a second reforming zone, wherein a molar ratio of light olefins to hydrocarbons in the reformate effluent stream is between 0.01 and 0.2;
passing the reformate effluent stream to the second heating zone and heating the reformate effluent stream in the second heating zone;
passing the reformate effluent stream from the second heating zone to a second reforming zone; and,
reforming the hydrocarbons in the reformate effluent stream in the second reforming zone, the second reforming zone having catalyst and being configured to provide a second reformate effluent stream.

2. The process of claim 1 further comprising:
mixing the feed stream with a light olefins stream before the feed stream is passed to the first reforming zone.

3. The process of claim 2 , wherein a molar ratio of light olefins to hydrocarbons in the feed stream is between 0.01 and 0.2.

4. The process of claim 3 further comprising:
mixing the second reformate effluent stream with a light olefins stream.

Assignees

• Uop Llc

Inventors

• Holmgreen Erik
• Jin Lin
• Lapinski Mark P
• Devereux Brian M

Classifications

• C10G2400/30

  Aromatics · CPC title

• C10G35/04 Primary

  Catalytic reforming · CPC title

• C10G59/02

  plural serial stages only · CPC title

• C10G2300/80

  Additives · CPC title