Chromatographic analysis of petroleum fractions used in oil-extended rubber

Abstract

Th e class ification of oils wi th r esp ect to differe nces in composition is important in t heir use in the manufacture of oil-exte nded butadiene-styr ene rubber. A ra pid chromatographic method of anal ys is has been developed in whic h 2.5-to 3.0-gram samples of oil are desorbed from silica gel into fi ve different fractions by s uccess i ve el u tio n with p entane, benzene, carbon tetrachloride, a nd etha nol as eluents. Six extender-oils were analyzed by t hi s method . Ph ysical properties of t he separated fractions showed marked differences betwee n fractio ns of t he sa m e oil and sim.ilari ties b et ween corresponding fractions of t h e difl'erent o ils. Th e chromatographic separation of extender-oils in to composit iollally different fractio ns provides a method for eval uation of t he eff ect of different componen ts on sp ecifi c properties of t he finished rubber product.

Chromatography

“…Although gas chromatography is now the method of choice for separation of hydrocarbons, interest in the improvement and application of liquid chromatography continues. In addition to the conventional fractional elution from silica gel columns (394,850,1578), very long (294,464) and reuseable alumina columns, operating analogous to gas chromatographic columns are now in use (778). Coupled columns (1752), displacement (1164), linear elution adsorption (1460), and fractional precipitation (1380) chromatography have also been applied.…”