production of sulfuric acid from coke oven gas desulfurisation product

摘要

The present invention relates to a process and a process plant for the production of sulfuric acid from a gas comprising H2S characterized by the following steps; directing said gas to an alkaline absorber containing a liquid ammonia absorbent solution and a combustible material catalytically active in oxidation of H2S to elemental sulfur providing a liquid slurry comprising sulfur and waste liquid, separating at least a portion of said elemental sulfur from waste liquid by mechanical means of separation as a sulfur sludge, combining said sulfur sludge with an ash-free support fuel and a first gas comprising oxy gen in or upstream an incinerator, incinerating said mixture, providing an incinerated gas comprising SO2, optionally adding a second gas comprising oxygen to said incinerated gas, contacting said process gas with a material active in oxidation of SO2 to SO3 providing an oxidized process gas, optionally adding water to said oxidized process gas and condensing concentrated sulfuric acid formed in said oxidized process gas with the associated benefit of the incinerated gas being substantially ash free, such that the process downstream the incinerator may be conducted with little or no filtration.