Condensing sulfuric acid vapors to produce sulfuric acid
First Claim
1. A process for producing sulfuric acid comprising condensing sulfuric acid vapors from a gas mixture containing 0.01 to 10% by vol. of H2 SO4 vapor, calculated under the assumption that SO3 is fully hydrated, and 0 to 50% by vol. of aqueous vapor, by direct or indirect cooling in a sulfuric acid tower, including the step of adding before inflow of the gas into the tower a smoke or an aerosol of solid particles having a content of 109 to 1012 solid particles per Nm3 per 0.1% H2 SO4 vapor in the gas at entry thereof into the tower, calculated under the assumption that SO3 in the tower is completely hydrated to H2 SO4.
1 Assignment
0 Petitions
Accused Products
Abstract
When condensing sulfuric acid from gases containing sulfuric acid vapor and steam in excess, e.g. originating from a power station, a substantial decrease of the amount minute droplets of sulfuric acid (the so-called acid mist) escaping to the surroundings is obtained, even in cases where the sulfuric acid plant is equipped with an aerosol filter, if minute nucleation cores are incorporated into the gas in an amount of 109 to 1012 solid particles per Nm3 per 0.1 % H2 SO4 -vapor in the gas. The nucelation cores may, e.g., be generated by combusting hydrocarbons with>2 carbon atoms or silicones, or added as smoke from an electric arc or welding.
12 Citations
19 Claims
- 1. A process for producing sulfuric acid comprising condensing sulfuric acid vapors from a gas mixture containing 0.01 to 10% by vol. of H2 SO4 vapor, calculated under the assumption that SO3 is fully hydrated, and 0 to 50% by vol. of aqueous vapor, by direct or indirect cooling in a sulfuric acid tower, including the step of adding before inflow of the gas into the tower a smoke or an aerosol of solid particles having a content of 109 to 1012 solid particles per Nm3 per 0.1% H2 SO4 vapor in the gas at entry thereof into the tower, calculated under the assumption that SO3 in the tower is completely hydrated to H2 SO4.
Specification