Phase Behavior of Binary and Ternary Mixtures for Polydodecyl methacrylate and Dodecyl Methacrylate in Supercritical Fluid Solvents

摘要

Experimental cloud-point curves for poly(dodecyl methacrylate) [P(DDMA)] + dodecyl methacrylate (DDMA) or dimethyl ether (DME) in supercritical CO2 show the binary and ternary mixtures up to 200 o C and 2,480 bar. The location of the P(DDMA) + CO2 cloud-point curve shifts to lower temperatures and pressures when DDMA or DME is used as a cosolvent. P(DDMA) does not dissolve in pure CO2 to the temperature of 220 ℃ and the pressure of 2,600 bar. High pressures phase behavior data is presented for the CO2 + DDMA system at 40 ~ 120 ℃ and up to ca. 252 bar. The system exhibit type-I phase behavior with a continuous mixture-critical curve and the system is adequately modeled with the Peng-Robinson equation of state. High pressure phase behavior data are reported for P(DDMA) in supercritical propane, propylene, butane, and 1-butene. Cloud-point curves for the P(DDMA) in C4 hydrocarbons are at lower temperatures than the P(DDMA) + C3 hydrocarbons curves at fixed pressures.