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8. ABSORPTION | Download for quality grades |

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8.1 Introduction Absorption is one of the important gas – liquid contact operations in which a gaseous mixture is contacted with a solvent to dissolve one or more components of the gas preferenti ... ally and provide a solution of them in the solvent. Some of the applications of this operation are as follows: (i) Ammonia is removed from coke – oven gas with water (ii) Benzene and toluene vapors are removed using hydrocarbon oil from the coke – oven gas. (iii) Hydrogen sulfide is removed from naturally occurring hydrocarbon gases with alkaline solutions. (iv)Ammonia and other water soluble harmful gases from air are removed using water. 8.2 Gas solubility in liquids at equilibrium The equilibrium characteristics of gas solubility in liquids are generally represented as partial pressure of solute in gas (p*) vs mole fraction of solute in liquid (x). A typical gas solubility curve drawn at a particular temperature and pressure for different gases is shown in Fig 8.1. [Show More]

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