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[savinedanglokta]

i simulated a column for separating diethyl ether from methanol and it always output this error i'm not sure how to fix.

 

***SEVERE ERROR

   THE FOLLOWING STAGES DRIED UP (VAPOR OR LIQUID FLOW APPROACHES 0):

    11   12

   A LIMIT OF  0.10000E-04 * SUM OF FEEDS WAS IMPOSED ON THE FLOW RATES

   OR A LIMIT OF  0.10000E-04 WAS IMPOSED ON THE STAGE V/L OR L/V RATIO.

 

for the configuration of the radfrac i input number of stages, reflux ratio, and distillate to feed ratio that i got from DSTWU earlier. other than that i also input the condenser pressure and column pressure drop.

[Pilesar]

Radfrac unit will not give the exact same answer as DSTWU. In addition to the inputs, add specifications and variables to allow the Radfrac unit to find its own answer. Simple Specs would be Reflux Ratio and the flow rate of one of the product streams. Simple Vary would be the condenser and reboiler duties.