Solvent Substitution Strategies for Finishers
The cleaning and coatings industrial sectors have been affected by restrictions on ozone-depleting (OD) solvents, hazardous air pollutants (HAPs), smog producing volatile organic carbon (VOC), and solvents with a high global warming potential (GWP).
The cleaning solvent, the surface, and the soil must spontaneously “like each other”. For the soil and solvent a negative Gibbs energy of mixing (DGmix) indicates that the substances “like” each other enough to mix spontaneously.
The DGmix can be written (Eq. 1) in terms of the enthalpy of mixing (DHmix), the entropy of mixing (DSmix), and the temperature of the system (T).