Mass transfer with chemical reaction in multiphase systems by Erdogan Alper

By Erdogan Alper

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Very fight against the air pollution) - the manufacturing of pure products : BaCl 2 , adipic acid, nitrates, phosphates ... - biology : aerobic fermentation, oxidation nufacturing of proteins from hydrocarbons, treatment ... HP, to , mawaste - multi- and two-phase flow in petroleum and nuclear engineering. The heart of these processes is an absorber or a reactor, of configuration best suited to the chemical or carried out. Indeed gas-liquid contactors present such as tubular spray columns, wetted packed columns, bubble columns, columns, mechare~ctors, jet and venturi reactors, lift loop reactors ...

In contrast with this, C02 undergoes reactions which only under co~ ditions may be regarded as instantaneous. , one where ST equals the right hand side of Equation 78), the chemically com bined form of CO 2 is the bicarbonate ion and therefore the reactio: for C02 can be written as : + + + B + BH + HCO (82) 3 Reaction 82 is in general slow enough as to result in the mass transfer of C02 taking place at most in the fast reaction regime (the kinetics of Reaction 82 will be discussed in some more detail below).

This in turn would require particle diameters no more than 10-5 cm, an unrealistically low value. It therefore appears that, whenever the reaction takes place at the liquid-solid interface, no significant rate ment will be observed for the gas-liquid mass transfer process: the latter will essentially in the slow-reaction In conclusion, one may say that mass transfer from the gasliquid interface to the bulk of the in slurry reactors is unlikely to exhibit any major enhancement effect unless the solu bility of the solid is appreciably larger than the physical sol~ bility of the gas.

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