Separation of technical waxes by temperature-programmed packed-capillary liquid chromatography

A high-melting saturated hydrocarbon wax in the carbon range C-28 to C-90, with an average molecular mass of 785, and a saponified, oxidized Fisher-Tr opsch wax of average molecular mass 745 have been characterized by reversed -phase packed-capillary liquid chromatography with isocratic nonaqueous mob ile phases. High-temperature injection, temperature-programming, and miniat urized evaporative light-scattering detection were successfully employed fo r these separations. The injection of the wax samples, of low solubility at ambient temperature, was achieved by use of a high-temperature sample-intr oduction device. Temperature programming was required to achieve satisfacto ry resolution between the numerous components of the complex wax samples.