Inventors:
Peter Hill - Woodstown NJ, US
Mitchell Scott Chinn - Wilmington DE, US
Ulrich Klabunde - West Chester PA, US
Assignee:
E I du Pont de Nemours and Company - Wilmington DE
International Classification:
B01D 21/00
B01D 21/01
C02F 1/52
US Classification:
210737, 210719, 423140, 423141
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.
