Recovery of by-products: coal, Biology

Recovery of tar: the coke oven gas coming out from ovens is passed through a tower where liquid ammonia is sprayed. The tar and dust are removed and then recovered.

Recover of NH3: the gases are then passed through a tower in which water is sprayed. It is removed as ammonia hydroxide.

                                 NH3 + H2O  404_hydrocarbon.png  NH4OH

Instead Of Water, If Sulphuric Acid Is Sprayed, It forms Ammonium Sulphate Which Can Be Recovered.

                                 2NH4OH + H2SO4  404_hydrocarbon.png (NH4)2SO4 + 2H2O.

Recovery of Naphthalene:  after removal of nh3, the gases are passed through a cooling tower where water at low temperature is sprayed. Naphthalene and some condensed gases are recovered.

Recovery of benzene: it can be recovered by passing the gas through chamber where petroleum is sprayed.

Recovery of H2S :  the gas is passed through chamber containing moist Fe2O3, where it is recovered

                                 Fe2O3 + 3H2404_hydrocarbon.png Fe2S3 + 3H2O

                     Fe2O3 can be regenerated by treating Fe2S3 with air

                                 Fe2S3 + 4O404_hydrocarbon.png2FeO + 3SO2

                                 4FeO + O2 404_hydrocarbon.png 2Fe2O3

The coal gas is recovered and collected in a gas holder after passing through various chambers to removed the by- products. The calorific value of the gas is 5000 kcal/m3.

Posted Date: 7/12/2012 4:45:11 AM | Location : United States

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