マイクロ・ワックスの組成分析

抄録

A rapid method of composition analysis for microcrystalline (M.C.) wax using liquid adsorption. chromatography and the urea adduction method was established. Physico-chemical properties, infrared absorption spectrum, differential thermal analysis of each component in M.C. waxes were measured.
The following conclusions were obtained from the experimental results.
(1) n-Paraffins, iso-paraffins, aromatics and resins in M.C. waxes were separated and then determined quantitatively by the combined analysis using liquid adsorption chromatography and urea adduction. The repeatability of this analytical method was quite good.
(2) Distribution of n-paraffins, iso-paraffins, aromatics and resins during the production of M.C. wax could make clear by analyzing the composition of crude wax, M.C. wax products and wax by-products. It was suggested that this analytical method is very useful in the production research of commercial M.C. wax.
(3) Infrared absorption spectrum of each component in M.C. waxes showed that n-paraffins had an intense methylene absorption band, while iso-paraffins had an intense methyl absorption band and aromatics showed a substituted benzene absorption band. The change in methylene rocking absorption spectrum of M.C. waxes at various temperaturs was investigated and correlated to the melting point of M.C. waxes.
(4) Differential thermal analysis curves of each component in M.C. waxes showed special characteristics. The melting point of M.C. waxes could be inferred from the transition point of these curves.