In the 2016 case, in the afternoon, Y=1.425X; determine the distillate yield D at the top of the tower
Thread Content
The feed rate is 120 kmol/h, and the vapor flow rate in the stripping section is 100 kmol (it’s not clear whether these two values are reversed). R = 1.3Rmin, Y = 1.425X; determine the overhead distillate flow rate D. I’ve been trying to calculate it for ages with no answer; please, someone knowledgeable can help!
I calculated this several times as well, but it was always a bit off; in the end I chose one that was close enough. I’m not sure if I made a mistake
This post was last edited by nigel19861 on 2016-9-6 at 11:11. By using a bubble feed, the amount of vapor rising during distillation and rectification becomes equal. Then the minimum reflux ratio is calculated; this ratio needs to satisfy the equation given in the problem. I’m not sure if this is correct – maybe it matches one of the options
Dew point feed: (q=0 ................................ not bubble point
Dew point feed: (q=0 ................................ not bubble point
The topic mentions fed batch processing; I remember that very well
Dude, there are two questions in total: the first is the dew point, and the second is the bubble point
This can be calculated. In the previous question, it involved feeding at the dew point; I substituted the values and got a result that didn’t match the answer, so I guessed. After the exam I remembered what went wrong
This question isn’t difficult; it’s sufficient to find V based on the relationship between V and V’.
It’s indeed a dew point, a bubble point; there are quite a few issues. I don’t even know the formula for calculating Rmin for feeding at the drawing point. Since I know it’s feeding at the drawing point, I have no choice but to use the formula for feeding at the bubble point. It’s impossible to get by without reading books or summarizing what one has learned
To calculate the dew point, it is also necessary to know the content of the feed components; yq = xf. This value is then used in the phase equilibrium equation to determine xq. Substituting these values into the formula Rmin = (xd – yq) / (yq – xq), along with R = 1.3Rmin and D = (V + F) / (1 + R), allows for further calculations