This section begins with Aspen The importance of physical property method selection in plus calculation, and then select NRTL method to simulate the given DME system in this design, and a series of physical property data are calculated. In this section, only the physical property data to be used later are listed. At the same time, the physical property data calculated and the data in the literature are compared, and the difference between the results is very small, which proves that the physical property method selection is more appropriate.<br>Secondly, the preliminary simulation is carried out by using dstwu module. Based on the given design task, the separation temperature and pressure are selected, and the minimum reflux ratio, the minimum number of theoretical plates, the position of feeding plate and other parameters are calculated (see the table for the results Two point one And table Two point three ), which provides the basis for the subsequent RADFRAC calculation.<br>Finally, the RADFRAC module is used for detailed design, and the minimum reflux ratio and heat load required to meet the separation requirements are obtained (see table for the results Two point four And table Two point five )。 Then tray sizing / tray rating is used to get the tower height as 13.1m , tower diameter 0.74m Floating valve tower is adopted for the tray, and the hydraulic performance is checked, and the results meet the requirements.<br>
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