Abstract

A method and a facility for wet-scrubbing sulfur dioxide to produce, for example, potassium thiosulfate or ammonium thiosulfate. The facility includes a multi- section vessel having multiple horizontally disposed stages where a preceding stage passes partially-scrubbed waste gas to a succeeding stage. Each stage has a scrubber mechanism to scrub waste gas with circulating fluid that successively reduces waste gas concentration before atmospheric discharge. The scrubber mechanism may include a packing to facilitate absorption of waste gas by the fluid, a sump disposed at the output of the stage to receive fluid as it drains from the packing, and a circulation pump to circulate fluid from the sump to its packing and to cascade at least a portion of the fluid back to a preceding stage. A portion of the fluid is extracted from the facility and reacted in a reaction vessel with a cation to produce ammonium thiosulfate or potassium thiosulfate.

IPC Classes  ?

• B01D 53/18 - Absorbing unitsLiquid distributors therefor
• B01D 53/50 - Sulfur oxides
• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/96 - Regeneration, reactivation or recycling of reactants

Abstract

2 by the fluid, a sump disposed at the output of the stage to receive fluid as it drains from the packing, and a circulation pump to circulate fluid from the sump to its packing and to cascade at least a portion of the fluid back to a preceding stage. A portion of the fluid is extracted and reacted in a reaction vessel with a cation to produce potassium thiosulfate.

IPC Classes  ?

• C01B 17/64 - ThiosulfatesDithionitesPolythionates
• B01D 53/18 - Absorbing unitsLiquid distributors therefor
• B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
• B01D 53/34 - Chemical or biological purification of waste gases
• B01D 53/50 - Sulfur oxides
• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/96 - Regeneration, reactivation or recycling of reactants

Abstract

A method and a facility for wet-scrubbing sulfur dioxide to produce, for example, potassium thiosulfate or ammonium thiosulfate. The facility includes a multi-section vessel having multiple horizontally disposed stages where a preceding stage passes partially-scrubbed waste gas to a succeeding stage. Each stage has a scrubber mechanism to scrub waste gas with circulating fluid that successively reduces waste gas concentration before atmospheric discharge. The scrubber mechanism may include a packing to facilitate absorption of waste gas by the fluid, a sump disposed at the output of the stage to receive fluid as it drains from the packing, and a circulation pump to circulate fluid from the sump to its packing and to cascade at least a portion of the fluid back to a preceding stage. A portion of the fluid is extracted from the facility and reacted in a reaction vessel with a cation to produce ammonium thiosulfate or potassium thiosulfate.

IPC Classes  ?

• C01B 17/64 - ThiosulfatesDithionitesPolythionates
• B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
• B01D 53/18 - Absorbing unitsLiquid distributors therefor
• B01D 53/34 - Chemical or biological purification of waste gases
• B01D 53/50 - Sulfur oxides
• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/96 - Regeneration, reactivation or recycling of reactants