Substantially pure cyclic phosphonitrilic chloride trimer
US4259305A · kind A · utility
2Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 31, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Dec 31, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/0986
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the separation of phosphonitrilic chloride trimer from mixtures containing other higher cyclic and linear phosphonitrilic chlorides involves contacting the crude phosphazene mixture with a ketone and preferably in the presence of a solvent and water so that a separable liquid fraction whose phosphazene constituent consists essentially of cyclic phosphonitrilic chloride is formed. The fraction is then separated and the trimer easily isolated by known methods in the art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.