Patent · US Active

Selective removal of sulfide from aqueous alkali solutions

US8454840B1 · kind B1 · utility

1Cited by
35References
14Claims
0Family size

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Inventor

Key dates

Filing dateFeb 28, 2012
Grant dateJun 4, 2013
Priority date—
Expiry dateFeb 28, 2032

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC01D7/30
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A method for removing sulfide from an aqueous alkali solution in which hydrogen peroxide is introduced into a sulfide-containing aqueous alkali solution associated with an alkali mineral recovery operation. The method is particularly useful for the processing of sulfide-containing aqueous alkali solutions containing NaHCO3 and Na2CO3, where bicarbonate in the sulfide-depleted alkali solution is decomposed to form Na2CO3, with concurrent evolution of gaseous carbon dioxide byproduct but without formation of gaseous H2S as a pollutant, and where Na2CO3 values are subsequently recovered from the sulfide-depleted carbonate-rich alkali solution via a crystallization operation.

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