Apparatus and processes for the concentration of sulphuric acid
US4547353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/88
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing concentrated sulphuric acid from a hot gas stream comprising water and sulphur trioxide which process comprises feeding a first portion of said gas stream through a first sulphur trioxide absorption zone and a second portion through a second sulphur trioxide absorption zone; feeding a recycled sulphuric acid stream to said first sulphur trioxide absorption zone whereby substantially all of the sulphur trioxide and sulphuric acid are removed from said first portion of said gas stream to produce an enlarged sulphuric acid stream; recycling a first portion of said enlarged sulphuric acid stream through said first sulphur trioxide absorption zone; feeding a second portion of said enlarged sulphuric acid stream to said second sulphur trioxide absorption zone; and collecting sulphuric acid product from said second sulphur trioxide absorption zone; wherein the ratio of gases to sulphuric acid in said second sulphur trioxide absorption zone is such that the sulphuric acid product leaving said zone is of the desired concentration to a maximum of the azeotropic concentration. The process is of value in the production of concentrated sulphuric acid from waste sulphuric…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.