Solubility of R22, R23, R32, R134a, R152a, R125 and R744 refrigerants in water by using equations of state

• VPT and CPA equations of state were used.
• The binary interaction parameters were optimized by two phase equilibrium data.
• The accuracy of VPT EOS- modified mixing rule model was obtained about 1.5%.
• The accuracy of CPA EOS-Van der Waals mixing rule model was obtained about 3.5%.
• The effect of dipole moment of components in error of CPA model was investigated.

This paper tries to demonstrate the ability of VPT and CPA equations of state and modified mixing rules for predicting of solubility CHC1F2 (R22), CHF3 (R23), CH2F2 (R32), C2H2F4 (R134a), C2H4F2 (R152a), C2HF5 (R125) and CO2 (R744) refrigerants in water at different temperatures and pressures. For this purpose, the fugacity of each component in gas and liquid phases is calculated by using VPT and CPA equations of state. Also in this work, the interaction parameters for mixing rules in each mixture are optimized by using two-phase equilibrium data (VLW). Results of the two-phase flash calculation show good agreement between obtained solubility and the experimental data. The predicted solubility of the selected refrigerants in water agrees with the experimental data with accuracy of about 1.5% and 3.5% by VPT equation of state – modified mixing rule and CPA equation of state – Van der Waals classic mixing rule respectively.