Patent · US Expired

Method and apparatus for processing waste sulfuric acid

US5466352A · kind A · utility

3Cited by

7References

9Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Volker Brucken · Eschborn, DE
Manfred Potzschke · Kronberg, DE
Bernd Langner · Winsen, DE
Michael Stelter · Chemnitz, DE

Key dates

Filing date	Jun 17, 1994
Grant date	Nov 14, 1995
Priority date	—
Expiry date	Jun 17, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/10
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method for processing waste sulfuric acid which is contaminated with halides and has an acid content up to 40% which comprises subjecting the waste sulfuric acid to an electrodialysis in which the electric field causes the univalent halides to permeate through an anion exchange membrane and to be selectively removed while the divalent sulfate ions of the sulfuric acid are substantially retained, the sulfuric acid leaving the electrodialyzer being almost entirely free of halides. A corresponding apparatus is also provided.

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