Low-temperature solvent fractionation of corn oil and calculation of its glyceride structure

Summary Corn oil was subjected to a low-temperature solventfractionation process and separated into 19 glyceride fractions; the glyceride structures of the fractions were calculated and added to obtain the glyceride structure of the oil. The experimentally obtained glyceride structure was compared to the structures calculated according to the mono-acid triglyceride, random, even, and partial random schemes and was found to agree most closely with the partial random system. The generous financial assistance of the Corn Products Refining Company, Argo, Illinois, is gratefully acknowledged. Contribution from the Department of Chemistry, University of Pittsburgh.     

REACTION OF DIFFERENT CLAY MINERALS WITH SOME ORGANIC CATIONS*

Selected pure samples of kaolinite, illite, and montmorillonite were washed with 0.05 N HCl until free from replaceable bases, washed with water or methanol, and then reacted with sufficient KOH to saturate the exchange complex with K⁺ at pH 7. These K clays were given variable dosages of n-butylamine acetate, dodecylamine acetate, and ethyldimethyloctadecenylammonium bromide. The conclusions are as follows: (1) additions of amines or other organic cations in amounts less than equivalent to the base-exchange capacity of the clay are rather. completely adsorbed in base-exchange reactions; amounts of large organic cations added in excess of the base-exchange capacity of the clay tend to be adsorbed by a different reaction, probably dependent on the action of the van der Waals' forces; and (2) the ability of clays to absorb water is greatly reduced by treating the‘clays with certain compounds that furnish a large organic cation.     

A qualitative method for detecting surface active agents

A NEW METHOD is presented for the qualitative detection of small amounts of surface active agents which is generally applicable to all types, i.e. anionic, cationic, and non-ionic. This method is based on the solubilization in aqueous solution of certain oil soluble dyes, particularly Brilliant Oil Blue BMA. Presented at 20th annual fall meeting, American Oil Chemists' Society, Oct. 30 to Nov. 1, 1946, in Chicago, Ill.