Abstract
Dodecyl and tetradecylbenzoic acids were prepared by oxidation of the corresponding alkyl-acetophenones derived from acetylation of alkylbenzenes. These acids were neutralized with various bases including alkali metal hydroxides and aminoalcohols such as 2-aminoethanol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1, 3-propanediol, tris (hydroxymethyl) -aminomethane and triethanolamine. Surface activities of these salts were determined and compared with each other.
These salts showed excellent lowering power of surface tension, except triethanolamine and tris (hydroxymethyl) -aminomethane salts. Most organic salts had larger value of cmc than inorganic salts. 2-Aminoethanol salts of both acids and 2-amino-2-methyl-1-propanol salt of dodecylbenzoic acid showed excellent emulsifying power for benzene, and for kerosene 2-aminoethanol and 2-amino-2-methyl-1-propanol salts of the acids proved to be better emulsifier than the other salts, but all of these salts emulsified moderately soy-bean oil as well as DBS (sodium dodecylbenzenesulfonate). 2-Aminoethanol salt and potassium salt of dodecylbenzoic acid showed better wettability than other salts, but inferior to DBS. Foaming properties of these salts were found not good.
