Patent · US Active

Process for removing impurities from iron chloride solutions

US8287738B2 · kind B2 · utility

0Cited by

10References

20Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Peter Hill · Wilmington, US
Mitchell Scott Chinn · Wilmington, US
Ulrich Klabunde · West Chester, US

Key dates

Filing date	Apr 14, 2010
Grant date	Oct 16, 2012
Priority date	—
Expiry date	Apr 28, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/80
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The disclosure provides a process for removing dissolved niobium, titanium, and zirconium impurities from an iron chloride solution having an iron concentration of about 50 to about 250 grams/liter comprising: (a) heating the iron chloride solution comprising a compound selected from the group consisting of a niobium compound, titanium compound, zirconium compound, and mixtures thereof, in a vessel, at a temperature of about 120° C. to about 300° C., and at least autogenous pressure, to precipitate the compound as a solid; and (b) separating the solid from the iron chloride solution. The separation of the solid is accomplished by filtration, settling, or centrifugation. In one embodiment, the iron chloride solution is a byproduct of the chlorination process for making titanium dioxide.

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