What is Mass transfer? Fick's law of diffusion.
Mass transfer is the transfer of mass from a region of higher concentration to lower concentration. It is a unit operation(physical changes). So we can not see any chemical change. Mass transfer plays an important role in industrial process. Examples: ln petroleum refinery, distillation of crude oil converts into many fraction like LPG, petrol, kerosene, diesel, lubricating oil, etc. CLASSIFICATION OF MASS TRANSFER OPERATION: We can classify the mass transfer operation into six phase contact. 1. Gas-Gas 2. Gas-Liquid 3.Gas-Solid 4. Liquid-Liquid 5. Liquid-Solid 6. Solid-Solid 1. Gas-Liquid: we talk about gas liquid mass transfer operation we can say that transfer can be from gas to liquid or liquid to gas.we study; (a). Distillation it is a separating process.in distillation we created the gas phase from liquid by application of heat; or created the liquid from the gas by removal of heat. Ex. Solution of acetic acid and water is partially vaporized by heating, and after