Modeling high-pressure vapor–liquid equilibrium of limonene, linalool and carbon dioxide systems

✍ Scribed by S.A.B Vieira de Melo; G.M.N Costa; A.M.C Uller; F.L.P Pessoa

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 204 KB
• Volume: 16
• Category: Article
• ISSN: 0896-8446
• DOI: 10.1016/s0896-8446(99)00030-3

✦ Synopsis

The research reported in this study is focused on modeling high-pressure phase behavior for CO 2 -limonene and CO 2 -linalool. A modified Peng-Robinson equation of state was applied to calculate vapor-liquid equilibrium using five different mixing rules obtained by incorporating activity coefficient models. The methodologies proposed by Heidemann-Kokal, Wong-Sandler and LCVM were used coupled with NRTL, UNIQUAC and UNIFAC models. A comparative analysis of the generated models was done for the binary systems and the best model was chosen to describe phase behavior of the system CO 2 -limonene-linalool. An isothermal flash calculation was applied to investigate selectivity and yield simultaneously for this ternary system in order to understand better the process parameters governing supercritical CO 2 deterpenation of citrus peel oil. The results showed that to obtain good separation between limonene and linalool at 50°C and pressures from 80 to 90 bar a high CO 2 /oil ratio is needed. As this ratio decreases, the process can be operated at 60 and 70°C over the same pressure range with equivalent performance.