Back to results
US 2005/0115901 A1Published application
Preparation of waste water containing sodium chloride for use in chlor-alkali electrolysis
OwnerJuergen Heuser, Werner Verhoeven +1inventors
InventorsJuergen Heuser, Werner Verhoeven, Domien Sluyts
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the treatment of waste waters containing common salt, characterised in that, by a specific sequence of acidification, extraction, alkalisation and stripping steps, an aqueous common salt solution is obtained, which can be used directly in chlor-alkali electrolysis.
Claims12
1-10. (canceled)
A process for purifying waste water containing one or more chlorides, residual acids, residual bases or residual solvents comprising:
- a) acidifying the waste water,
- b) contacting the waste water from step a) with an extracting agent in a manner such that an organic phase and an aqueous phase are generated,
- c) adding an alkaline material to the aqueous phase generated in b) in an amount sufficient to cause that phase to have a pH of from 7 to 13, and
- d) stripping the treated phase from step c) to obtain purified water.
1 more element
Dependencies are inferred from the claim text.