AMMONIUM SALTS OF RAPESEED OIL FATTY ACID
Abstract
Monoethanolamine, diethanolamine, triethanolamine, methylaminoethanol, piperidine, morpholine (Mr), diethylamine, triethylamine, ethylenediamine, diethylenetriamine and triethylenetetramine salts of rapeseed oil acid fraction have been synthesized. Colloidal–chemical parameters of these salts have been determined (critical micelle concentration, effectiveness of surface tension reduction, surface excess concentration, area per molecule at the interface, changes of Gibbs free energies of micellization and adsorption). For surfactants having the same, a hydrophobic portion a character of change of colloid-chemical parameters depending on the structure of the hydrophilic part has been revealed. Unlike the other synthesized ammonium salts, the surfactants having hydrophilic diethylolammonium and methylethylolammonium groups greatly reduce the surface tension at the water-air interface. Thus, their presence at the indicated border lowers the surface tension from 72,0 down to 25,3 and 26,0 mN/m, respectively. The CMC values of the surfactants having piperidinium group are the lowest. Petroleum-collecting and petroleum-dispersing capacities of the synthesized salts on the surface of water of varying mineralization degree have been studied. The surfactant synthesized on the basis of morpholine has a high petroleum-collecting and petroleum-dispersing effect.Downloads
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