Process for the concentration of sulphuric acid containing metal sulphates
US5061472A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1990 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the recovery of sulphuric acid from waste acids containing metal sulphates by evaporative concentration and separation of the metal sulphates from the suspension obtained by evaporation, the improvement wherein vapors leaving the evaporators together with droplets of sulphuric acid containing metal sulphates and solid metal sulphates are condensed by direct contact with cooled contaminated vapor condensate, cooling of this vapor condensate which is circulated as cooling medium is carried out in a flash evaporator and the vapors leaving the flash evaporator free from metal sulphates and sulphuric acid are directly or indirectly condensed by means of cooling agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.