C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/113
C01B 17/74 (2006.01) C01B 17/775 (2006.01)
Patent
CA 1059727
ABSTRACT OF THE DISCLOSURE: The present invention relates to a process of producing sulfuric acid from SO3-containing humid gases, in which the SO3-containing humid gases are directly cooled with aqueous sulfuric acid, sulfuric acid is condensed in the gases cooled below the dew point of the sulfuric acid, and the water not required to form sulfuric acid is discharged as water vapor with the end gases, characterized in that sulfuric acid of 70-95% by weight is added to cocurrently flowing, SO3-containing humid gases so that the latter are directly cooled to 120-230°C, a major part of the sulfuric acid is collected in a sump, a partial stream of the collected sulfuric acid is indirectly cooled and then recycled to the SO3-containing gases, the other part of the sulfuric acid is discharged as product acid, cold air is admixed to the cooled gases, the gas-air mixture is sub- sequently treated with dilute sulfuric acid of 5-70% by weight, the dilute sulfuric acid is collected and further diluted by an addition of water, a partial stream of the further diluted sulfuric acid is recycled to the gas-air mixture, the other part of further diluted sulfuric acid is added to the recycled acid of 70-95% by weight, the rates at which air and water are added are controlled 30 that the exhaust gas which has been treated with the dilute sulfuric acid has a temperature which is harmless for the succeeding units, the treatment with the dilute sulfuric acid results in an evaporation of water substantially at the rate at which it is added, and the acid mists are collected from the exhaust gas in a mist collector.
251801
Dorr Karl-Heinz
Grimm Hugo
Schmidt Georg
Tacke Michael
Weber Waldemar
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