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The effect of chemical and structural factors on the phase behavior of ionic liquids with alcohols is examined, focusing on pyridinium ionic liquids (ILs) for comparison to imidazolium ILs from previous studies. The nonrandom two-liquid (NRTL) equation with binary interaction parameters with linear temperature dependence has provided a good fit of the experimental data for all the systems.

The impact of different characteristics of the ionic liquids (ILs) and the alcohols on the liquid-liquid phase equilibrium of imidazolium-based ionic liquids and alcohols is examined. The ionic liquid-water mutual solubility data for a number of ionic liquids is discussed.

Ab initio molecular modeling is used to design nonfluorous polymers that are potentially soluble in liquid CO2. We have used calculations to design three nonfluorous compounds meant to model the monomeric repeat units of polymers that exhibit multiple favorable binding sites for CO2. These compounds are methoxy isopropyl acetate, 2-methoxy ethoxy-propane, and 2-methoxy methoxy-propane. We have synthesized oligomers or polymers based on these small compounds and have tested their solubility in CO2. All three of these exhibit appreciable solubility in CO2. At 25 degrees C, oligo(3-acetoxy oxetane)6 is 5 wt % soluble at 25 MPa, the random copolymer (vinyl methoxymethyl ether30-co-vinyl acetate9) is 5 wt % soluble at 70 MPa and random copolymer (vinyl 1-methoxyethyl ether30-co-vinyl acetate9) is 3 wt % soluble at 120 MPa. These oligomers and polymers represent new additions to the very short list of nonfluorous CO2-soluble polymers. However, none of these are more soluble than poly(vinyl acetate), which exhibits the highest CO2 solubility of any known polymer containing only the elements C, H, and O.