Candle Filters for Sulfuric Acid Applications

AMISTCO Candle Filter Mist Eliminators are used in Sulfuric Acid processes to prevent corrosion and damage to expensive downstream equipment and to control pollution. Water, shock cooling and oleum based mists result from the various sulfuric acid processes. The exact mist eliminator equipment recommended for a H2SO4 plant depends upon several factors.

1. Sulfur/SO2 source
2. Single absorption or double absorption
3. Location (drying tower, IPAT, FAT)
4. Equipment requiring protection
5. Type of acid produced
6. Pressure Loss
7. Local pollution control requirements

Sulfuric Acid Processes

Sulfur Burning Plant (dark and bright sulfur)-
Sulfur is burned and the SO2 gas is converted to SO3 through catalytic contact. SO3 gasses are absorbed by recirculating H2SO4 solution in an absorbing tower.

Metallurgical Plant-
Ore (pyrite) is roasted. The exit gas is purified, dried and fed into a catalytic converter. SO3 is absorbed on a H2SO4 solution.

Spent Acid plants-
By-products of the organic monomer industry (caprolactam, acrylonitrile) is burned. Exit SO2 is purified, dried, converted and absorbed in H2SO4.

Wet Process (decomposer process)-
The hydrogen sulphite is burned. Exit gas is fed into the converter without being dried.

Sulfuric Acid Candle Filter Applications

• Drying towers
• Interpass Absorbing Towers
• Final Absorbing Towers (FAT)
• CrossFlow Stripper
• Product Stripper
• Acid Concentrator
• Oleum Tank Vents
• SO2 Tail Gas Scrubbers (NH3)