Method for continuously preparing N,N-Bis(2,2,6,6-Tetramethyl-4-piperidyl)-1,6-hexamethylenediamine
US12084427B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | May 9, 2022 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Sep 7, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00889
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a method of continuously preparing N,N-Bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexamethylenediamine, which relates to chemical engineering. The Pt/C catalyst and the quartz sand are mixed uniformly and loaded to the continuous-flow fixed-bed reactor. Then, hydrogen gas and a substrate solution containing 2,2,6,6-tetramethyl-4-piperidinone and 1,6-hexanediamine are simultaneously fed to the micro-mixer and the continuous-flow fixed-bed reactor in sequence to undergo a continuous catalytic reductive amination to obtain the N,N-Bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexamethylenediamine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.