Method for starting up a pre-reforming stage
US-10259708-B2 · Apr 16, 2019 · US
Method of maintaining the activity of pre-reform catalysts
US11826745B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11826745-B2 |
| Application number | US-202217725286-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 20, 2022 |
| Priority date | Apr 22, 2021 |
| Publication date | Nov 28, 2023 |
| Grant date | Nov 28, 2023 |
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- Title
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Abstract
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The present invention addresses to a method of maintaining the activity of pre-reform catalysts in hydrogen production units, in order to avoid deactivation by oxidation or coke deposition of pre-reform catalysts in the absence of hydrogen in the feed consisting of hydrocarbon and water vapor.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of maintaining the activity of pre-reform catalysts, containing nickel as the active phase, in the absence of recycle hydrogen in a feed of a pre-reform reactor, characterized in that the following steps are carried out: a) introducing in the feed of the pre-reform reactor a catalyst activity maintenance fluid, in which a steam/fluid ratio is between 200 and 40 mol/mol and a reactor inlet temperature is between 430 and 550° C.; and b) stopping the feed of the catalyst activity maintenance fluid in the pre-reform reactor, when the hydrogen returns in the reactor feed and it has reached a H 2 /hydrocarbon ratio between 0.1 and 0.2 Nm 3 /kg. 2. The method according to claim 1 , characterized in that the catalyst activity maintenance fluid is selected from methanol, formaldehyde, formic acid, or mixtures thereof. 3. The method according to claim 1 , characterized in that the steam/fluid ratio is between 150 and 80 mol/mol. 4. The method according to claim 1 , characterized in that the reactor inlet temperature is between 450° C. and 500° C. 5. The method according to claim 1 , characterized in that the hydrocarbon (load) is selected from natural gas, liquefied petroleum gas, refinery gas or naphtha.
Assignees
Inventors
Classifications
- B01J38/62Primary
organic · CPC title
Nickel · CPC title
oxygen-containing · CPC title
- B01J37/0036Primary
Grinding · CPC title
- C01B3/38Primary
using catalysts · CPC title
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Frequently asked questions
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- What does patent US11826745B2 cover?
- The present invention addresses to a method of maintaining the activity of pre-reform catalysts in hydrogen production units, in order to avoid deactivation by oxidation or coke deposition of pre-reform catalysts in the absence of hydrogen in the feed consisting of hydrocarbon and water vapor.
- Who is the assignee on this patent?
- Petroleo Brasileiro S A —Petrobras
- What technology area does this patent fall under?
- Primary CPC classification B01J38/62. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 28 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).