Solubility in amide-water cosolvent systems: a thermodynamic view

Area of Science:

• Physical Chemistry
• Solution Chemistry

Background:

• Methyl p-hydroxybenzoate is a common ester with applications in various industries.
• Understanding its solubility in mixed solvent systems is crucial for process optimization.
• Amide-water mixtures are frequently used as cosolvents due to their unique properties.

Purpose of the Study:

• To determine the solubility of methyl p-hydroxybenzoate in amide-water cosolvents.
• To investigate the thermodynamic parameters of ester transfer within these systems.
• To elucidate the role of amide alkylation in modulating solute-solvent interactions.

Main Methods:

• Solubility measurements of methyl p-hydroxybenzoate across a temperature range (25-40°C).
• Calculation of thermodynamic transfer values using a specialized method.
• Analysis of results based on hydrophobic bonding principles.

Main Results:

• Solubility data was successfully collected and analyzed.
• Thermodynamic values indicated specific transfer behaviors of the ester.
• The presence of alkyl groups on amides was shown to influence interactions with both water and the ester.

Conclusions:

• Amide alkylation negatively impacts amide-water interactions.
• Alkylation enhances amide-ester interactions, affecting solubility.
• Hydrophobic bonding principles effectively explain the observed solubility trends.