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D uring t h e sulfonation of petroleum d i s t i l l a t e s for highly refined white o i l s , oil-soluble mahogany sulfonic a c i d s a r e obtained as a by-product i n t h e sour oil. T h i s oil may b e considered a heterogeneous system, a s it c o n t a i n s some of the s p e n t sulfuric acid not separated with t h e a c i d sludge p h a s e and t r a c e s of sulfur dioxide formed by redox s i d e reactions. T h e corresponding sodium s o a p may b e obtained a s a crude product by neutralization with sodium hydroxide and extraction from t h e refined oil with a q u e o u s alcoholic solutions. T h e crude extract, referred t o a s raw s o a p , is e s s e n t i a l l y a n aqueous alcoholic solution of mahogany sulfonates and oil, sodium sulfate, and t r a c e s of sodium sulfite.In t h e c o u r s e of s e v e r a l experiments, i t w a s observed t h a t when aqueous ethyl alcohol w a s u s e d as t h e extracting solvent, t h e raw s o a p could b e separated from t h e refined neutral oil a s a homogeneous solution, whereas with isopropyl alcohol t h e raw s o a p further separated into two individual layers.A n a l y s e s have shown that i n s u c h i n s t a n c e s t h e lower s o a p p h a s e w a s mainly a n aqueous solution of sodium sulfate, while t h e upper s o a p p h a s e w a s a n alcoho!ic solution containing most of t h e available sodium sulfonates.Solubility d a t a for sodium s u l f a t e i n aqueous solutions of ethyl and isopropyl alcohols were required t o permit a thorough examination of t h e p o s s i b l e application of alcohol for t h e removal of inorganic s a l t s (mainly sodium sulfate) from t h e raw s o a p by either precipitation or solution in water. B y t h i s means and after solvent evaporation, a salt-free solution of sodium sulfonates in oil may b e obtained.Solubility d a t a for t h e ternary s y s t e m ethyl alcohol-sodium sulfate-water have been reported by Seidell (3) and h a v e been extensively studied by Vener and Thompson (5). T h e latter authors s t u d i e d t h e system a t temperatures between 25" and 70°C. and found only o n e liquid p h a s e over t h e range of conditions examined. They were a b l e t o demonstrate, however, t h a t two liquid p h a s e s were obtained, over most of t h e solvent composition range, when a c e t o n e or isopropyl alcohol w a s t h e organic component. T h e saturated density data recorded w a s used by T u r s i and Thompson (4) t o study t h e effect of sodium s u l f a t e on t h e vapor-liquid equilibrium of ethyl alcohol and water. d e Bruyn (1) h a s reported liquid-liquid equilibria for t h e s y s t e m ethyl alcohol-sodium sulfate-water between certain concentrations of alcohol and t h e s e d a t a a r e copied by Seidell. Schreinemakers and d e B a a t (2) l a t e r noted that d e Bruyn's d a t a w e r e metastable equilibria. Evidence t o s u g g e s t a close relationship between t h e phenomenon of two-phase formation i n raw sodium sulfonate solutions and i n solutions of sodium s u l f a t e ...

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