Desulphurization of waste gases
AssigneeEuropean Economic Community
InventorsDaniel Van Velzen, Heinrich W. Langenkamp, Dimosthenis Papameletiou
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Abstract
The present invention relates to a process for the removal of sulphur dioxide from waste gases which process comprises contacting a waste gas containing sulphur dioxide with an aqueous solution containing sulphuric acid, hydrogen bromide and bromide to form sulphuric acid and hydrogen bromide; catalytically oxidizing in the vapor phase the hydrogen bromide formed to bromine and thereafter recycling the bromine to the first step of the process.
Claims16
A process for the removal of sulphur dioxide from waste gases which process comprises contacting a waste gas containing sulphur dioxide with an aqueous solution containing sulfuric acid, hydrogen bromide and bromine to form sulfuric acid and hydrogen bromide in the aqueous solution;
- wherein a portion of the solution containing the hydrogen bromide formed by said contact is subjected to a two-stage evaporating process to produce a concentrated hydrogen bromide containing vapor by evaporating a large portion of water from the solution in the first stage, continuing the evaporation in the second stage to produce said concentrated hydrogen bromide containing vapor;
- and catalytically oxidizing the hydrogen bromide in the concentrated hydrogen bromide containing vapor to produce bromine and thereafter recycling the bromine to the aqueous solution used to contact the sulfur dioxide waste gas.
Dependencies are inferred from the claim text.