The volatile organic content (VOC) emission in coating application is an important source of air pollution. The use of supercritical carbon dioxide (scCO2) as a carrier for coating systems is a potential solution to these problems. This new technology and its theory basis were discussed in this paper.The interaction of supercritical fluid and solute was investigated at first, the partial mole volume of SCF-toluene was measured. The experiment result shows that the partial mole volume of cosolvent is maximum...