Dicarboxylic acid hydrotrope properties

Aqueous Solution Properties of a Fatty Dicarboxylic Acid Hydrotrope... 

During the 1970 s, a new kind of hydrotrope was introduced, WESTVACO DIACID (9), (Fig. 2). It is a dicarboxylic acid with a total of twenty-one carbon atoms. Its basic properties have been investigated by Matijevic and collaborators (10), who determined its cmc and the association constants for the diacid in water. 

In recent studies, Friberg and co-workers (J, 2) showed that the 21 carbon dicarboxylic acid 5(6)-carboxyl-4-hexyl-2-cyclohexene-1-yl octanoic acid (C21-DA, see Figure 1) exhibited hydrotropic or solubilizing properties in the multicomponent system(s) sodium octanoate (decanoate)/n-octanol/C2i-DA aqueous disodium salt solutions. Hydrotropic action was observed in dilute solutions even at concentrations below the critical micelle concentration (CMC) of the alkanoate. Such action was also observed in concentrates containing pure nonionic and anionic surfactants and C21-DA salt. The function of the hydrotrope was to retard formation of a more ordered structure or mesophase (liquid crystalline phase). 

Ciassification Organic dicarboxylic acid Properties Anionic Toxicoiogy TSCA listed Uses Vise, control agent in cosmetics intermediate for soaps, esters, polyamide derive. surfactant coupling agent hydrotrope esp. in caustic systems hydrotrope, solubilizer for household, industrial, metalworking, textile, and institutional compounding... 

Chem. Descrip. Alkenyl dicarboxylic acid anhydride Uses Solubilizer, hydrotrope for laundry, hard surf., and l l cleaners Features Exc. solubilizer for fomiulations with nonionic surfactants and high electrolyte content Properties Liq. 100% act. 

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