Minimum in Their S T function

Compounds with a Minimum in Their S(T) function Many compounds, such as alkanes and its derivatives with a hydrophilic polar group, exhibit a solubility minimum at a temperature Thu,. For liquid alkanols, alkanoic acids, and alkylamines, Tmjn lies between 15 and 80°C [6]. The following qualitative results were given  

For each of the series of liquid alkanols, alkanoic acids, and alkylamines, rmin decreases with increasing Nc [6]. 

The estimation of the aqueous solubility at rmin and at other temperatures requires data on the enthalpy and the heat capacity of the solution. These properties are themselves temperature dependent and have been systematically studied for various sets of compounds such as hydrocarbons [58,59], 1-alkanols [60], alkoxyethanols, and 1,2-dialkoxyethanes [61], carboxylic acids, amines, and N-substituted amides [62], monoesters, ethylene glycol diesters, glycerol triesters [63], and crown ethers [64], Additive schemes for the estimation of aqueous solution heat capacities have been evaluated [65,66], 

Quantitative Property-S T) Relationship Dickhut et al. [67] developed a QP-5VV(7 )R based on experimental mole fraction solubilities for alkylbenzenes, PAHs, PCBs, chlorinated dibenzofuranes and p-dioxins, and alkyl- and halo-substituted naphthalenes and p-terphenyls in the range 4 to 40°C  

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