Purification of group IVb metal halides
US6770254B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Aug 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G23/024
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to an improved process for removing trace levels of Group IVb contaminants from a Group IVb metal tetrahalide of and particularly to a process for removing zirconium tetrachloride from titanium tetrachloride. The improvement resides in contacting a titanium tetrachloride feedstock containing trace impurities of zirconium tetrachloride or hafnium tetrachloride with a sufficient amount of titanium hydride to convert any zirconium tetrachloride or hafnium tetrachloride to a lower volatile compound. The resultant mixture is distilled and the titanium tetrachloride separated from the lower volatile zirconium or hafnium compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.