USE OF ALUMINA SUPPORT FOR THE SEPARATION OF ETHOXYLATED OLIGOMER SURFACTANTS ACCORDING TO THE LENGTH OF THE ETHYLENEOXIDE CHAIN

The theoretical plate number, capacity factor, peak assymetry and sepa ration factor of an alumina high-performance liquid chromatographic co lumn were determined using nonylphenyl ethylene oxide oligomers as sol utes and eluents containing n-hexane, dichloro-methane, dioxane, tetra hydrofuran, chloroform and ethyl acetate. The relationship between the chromatographic characteristics and physicochemical parameters of the stronger component in the eluent was calculated by multivariate mathe matical-statistical methods. It has been established that each solvent influences differently the chromatographic characteristics. The best separation was achieved by using n-hexane - dichloro-methane eluent. C alculation proved that the dielectric constant, dipole moment and the bulkiness of the solvent molecule have the highest impact on the separ ation capacity of the alumina column.