首页|Separation of alcohol hydrocarbon azeotropic system by supercritical CO2 coupled with thermal diffusion
Separation of alcohol hydrocarbon azeotropic system by supercritical CO2 coupled with thermal diffusion
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Supercritical CO2 (ScCO2) is widely used in the extraction of natural organic compounds because of its superior solubility and high selectivity. Thermal diffusion is a method of separating substances based on temperature gradient, which has been applied to the separation of isotopes. A new process for the separation of alcohol hydrocarbon azeotropes by supercritical CO2 and thermal diffusion coupling was proposed in this paper. Taking five binary azeotropic systems of ethanol-n-hexane, etiianol-n-heptane, isopropanol-n-hexane, isopropanol-n-heptane and nonanol-n-dodecane as the research objects, the best process for separating alcohol hydrocarbon azeotropes by ScCO2 coupled thermal diffusion was explored. The results showed that the process can effectively separate the above five binary alcohol hydrocarbon mixture systems. The optimum process operating conditions were as follows: the separation time was 180 min, the separation pressure was >9 MPa, the temperature difference between the two walls was 70-80 °C, and when the separation effect of each system was greater than 90%, the continuous separation times of the system was ethanol-n-hexane for 3 times; Ethanol-n-heptane, 4 times; Isopropanol-n-hexane, 4 times; Isopropanol-n-heptane, 5 times.
Supercritical CO2Thermal diffusionSeparateAlcohol hydrocarbon azeotropic system
Longwei Liu、Jintao He、Xia Gui
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College of Chemical Engineering Nanjing Tech University, 30 Puzhunan Road, Nanjing 211816, PR China
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