Gasification method

• Sulphur dioxide emission due to burning of coal or fuel oil can be minimized by gasifying them.
• During gasification, coal undergoes partial oxidation resulting in CO and .
• Sometimes, and other gases can also be produced during gasification of coal.
• In this case, sulphur content gets converted into hydrogen sulphide , which can be removed by absorption or adsorption method..
• In absorption method, gases are scrubbed with alkaline reagent such as sodium carbonate or ethylamine.
• Subsequently elemental sulphur is produced.
• In adsorption method, ferric oxide is used to adsorb hydrogen sulphide using fluidized bed around 400°C.