INFLUENCE OF SURFACE-ACTIVE AGENTS ON THE CRYSTALLIZATION KINETICS UNDER DIFFERENT STIRRING CONDITIONS

The effects of sodium dodecyl benzene sulphonate as surface active age nt on crystallisation kinetics have been studied in a 'continuously mi xed suspension mixed product removal evaporative crystalliser' (MSMPRC ). Mechanical stirring as well as air stirring are separately tested a nd their relative effects discussed. The nucleation rate is substantia lly higher in the presence of surface active agents for air stirring t han that for mechanical stirring under identical conditions. The growt h fates are observed to be nearly the same for two types of stirring.