In chemical industry, the solvents need for the different procedures is always different. The exchange of solvent consumes lots of energy and sometimes leads to the pollution to the environment. To solve this problem, in the recent years, the CO2-triggered switchable polarity solvent (SPS) have been concerned. And for the utilization of SPS, the experimental polarity data of different SPS and the prediction method of SPS polarity will be very helpful for the chemical process. In this research, the SPS by CO2 based on alcohol (ROH) / DBU (1,8-Diazabicyclo[5.4.0]undec-7-ene) mixture reported by P.G Jessop was chosen [1]. The effect of ROH species and DBU mol% to polarity shift range switched in SPS was studied by Kamlet-Taft parameter π* which shows the polarizability and polarity of the solvent molecular. In addition, experimental data of π* is correlated to the molecular information of SPS using a quantum calculation.
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