Patent · US Active

Process for separating zirconium and hafnium

US7635396B2 · kind B2 · utility

1Cited by

2References

17Claims

0Family size

Assignee

H.C. STARCK INC. · US

Inventors

Knud Reuter · Krefeld, DE
Gerd Passing · Wermelskirchen, DE
Stephan Kirchmeyer · Leverkusen, DE

Key dates

Filing date	May 2, 2007
Grant date	Dec 22, 2009
Priority date	—
Expiry date	Jan 31, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F7/003
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention provides a new process for separating zirconium and hafnium compounds, in particular to remove traces of zirconium compounds from hafnium compounds, using fractional crystallisation, as well as hafnium compounds obtainable in accordance with this process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.