Presumably this is a concern of many solvent recovery machine manufacturers. In understanding this problem, let us first understand what a mixed solvent is.
The mixed solvent is not a simple average of the performance of two or more single solvents. In some good solvents/polymer solutions, inferior solvents (or non-solvents) are gradually added. Good, and then weakened; even a mixture of two non-solvents may show the behavior of a good solvent, which is the so-called cosolvent; but there are also cases where the two solvents become non-solvents after being mixed. In this way, the performance of the mixed solvent cannot be directly deduced from the performance of the corresponding two-component solvents. The situation of mixed solvents is more complicated. Its solubility properties, good and bad properties and elimination of volume effects, the interaction between two solvent molecules, the self-association of solvent molecules, the aggregation of polymers in solution, and the effect of polymers on a certain component Various factors such as preferential adsorption of solvents are related. The dielectric constant of the solvent can directly affect the solubility of the substance. The solubility change leads to changes in the thermodynamic state, kinetic process, and thermodynamic and kinetic balance of the solute. At the same time, the solvent medium changes, the interaction between solid particles, and the interaction between solid and solvent also change. Therefore, changes in the solvent environment will greatly change the state of the product.
