Patent · US Active

Process for recovering molybdate or tungstate from aqueous solutions

US8277765B2 · kind B2 · utility

4Cited by

9References

15Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Thomas Dietz · Richmond, US
Hans Ulrich Süss · Hasselroth, DE

Key dates

Filing date	Apr 28, 2009
Grant date	Oct 2, 2012
Priority date	—
Expiry date	Jul 24, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Process for recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound to a water-insoluble, cationized inorganic carrier material from the aqueous solution at a pH in the range from 2 to 6, the laden carrier material is separated off and the bound molybdate or tungstate is liberated once again into aqueous solution at a pH in the range from 6 to 14. The process is suitable for recovering molybdate or tungstate in the delignification of pulp with hydrogen peroxide in the presence of molybdate or tungstate as catalyst. The recovered molybdate or tungstate can be recycled to the delignification.

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