Cellulose triacetate (CTA) is CO2-insoluble primarily due to its crystallinity, but oligomers of CTA have been shown to be highly CO2-soluble. These oligomers were generated via the pivalolysis of high molecular weight CTA. The resultant mixture of oligomers was fractionated with organic solvents, and the CO2-solubility of the each fraction was determined at 300 K. The fluid phase behavior of mixtures containing CO2 and oligo-CTA composed of one to four per-acetylated monosaccharide repeat units was determined over the 0.1–5 wt% oligo-CTA range. In this concentration range, only bubble points were observed for the monomer. Both bubble points and dew points were observed for the dimer, trimer and tetramer. At a concentration of 5 wt% of oligo-CTA, two-phase pressures of 6.14, 7.38, 9.51 and 13.24 MPa were measured for the monomer, dimer, trimer and tetramer, respectively.
You have access to this article
Please wait while we load your content...
Something went wrong. Try again?