A question for a beginner: the DSTWU module~
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As the title suggests, the results obtained from DSTWU include two ratios: one is the reflux ratio and the other is the D:F ratio. Are these ratios mass ratios or molar ratios? When using the general module with MetCBAR units for calculations, I verified that D:F remains a molar ratio; however, I’m not sure whether the reflux ratio is a mass ratio or a molar ratio. Please give me some guidance.
Reply to 1# zhangfxz: Are the composition of the reflux and the distillate different? Software is a tool; one still needs to have a clear understanding of the basic concepts in specialized courses.
To correct what was said above: in the case of a full condenser, the composition of the reflux and the distillate is the same, but with a partial condenser, there should be differences. Additionally, what I’m asking is about the reflux ratio – that is, whether the reflux ratio calculated using the DSTWU module is a mass ratio or a molar ratio, and what relationship it has with the composition of the reflux stream and the distillate stream
Reply to 3# zhangfxz: If the composition is the same, can the molar ratio and mass ratio be different?
This post was last edited by zhangfxz on 2011-12-16 at 10:40. Reply to 4# rjb119: What about the situation with that condenser?
Reply to 5# zhangfxz: DSTWU is essentially an approximate calculation; moreover, the composition of the distillate from fractional distillation and that of the reflux are separated by one theoretical tray, hence no distinction is made in DSTWU. Other strict modules can be distinguished.
Reply to 5# zhangfxz: You really do have solid professional knowledge; I had no idea what quality or moles were. I just know that when things with the same unit are compared, the result is a number without a unit; that’s common sense.