Process For Preparing Amino Compounds From Nitrile Compounds
US-2018339959-A1 · Nov 29, 2018 · US
Process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile with reduced formation of diaminocyclohexane
US12415775B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12415775-B2 |
| Application number | US-202117913175-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 24, 2021 |
| Priority date | Mar 25, 2020 |
| Publication date | Sep 16, 2025 |
| Grant date | Sep 16, 2025 |
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- Title
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Abstract
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The present invention relates to a process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein the Raney nickel catalyst is modified by treatment with carbon monoxide or carbon dioxide in a liquid medium. 2. The process according to claim 1 , wherein the Raney nickel catalyst has been modified by pre-treatment with carbon monoxide in hydrogen prior to the hydrogenation. 3. The process according to claim 2 , wherein carbon monoxide is applied in a concentration of from 50 to 1000 ppm in hydrogen. 4. The process according to claim 1 , wherein the Raney nickel catalyst has been modified by pre-treatment with carbon dioxide in an inert gas prior to the hydrogenation. 5. The process according to claim 4 , wherein carbon dioxide is applied in a concentration of from 1 to 25 vol.-% in an inert gas. 6. The process according to claim 5 , wherein the inert gas is argon. 7. The process according to claim 2 , wherein the pre-treatment is carried out in water. 8. The process according to claim 2 , wherein the pre-treatment is carried out at a total pressure of from 2 to 50 bar at a temperature of from 0 to 40° C. 9. The process according to claim 1 wherein the Raney nickel catalyst is modified during hydrogenation by adding carbon monoxide to the hydrogenation gas. 10. The process according to claim 9 , wherein carbon monoxide is added in a concentration of from 50 to 1000 ppm to the hydrogenation gas. 11. The process according to claim 1 , wherein the hydrogenation is carried out at a temperature of from 50 to 150° C. at a hydrogen pressure of from 1 to 100 bar. 12. The process according to claim 4 , wherein the pre-treatment is carried out in water.
Assignees
Inventors
Classifications
1,6-Diaminohexanes · CPC title
by reduction with other reducing agents · CPC title
Diamines · CPC title
- C07C209/26Primary
by reduction with hydrogen · CPC title
- C07C209/48Primary
by reduction of nitriles · CPC title
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Frequently asked questions
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- What does patent US12415775B2 cover?
- The present invention relates to a process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.
- Who is the assignee on this patent?
- Basf Se
- What technology area does this patent fall under?
- Primary CPC classification C07C209/26. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 16 2025 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).