[Bug] Component wise mass balance not getting satisifed in Distillation Column

[nayakpriyam]

Describe the bug
Although the distillation column's overall mass balance is satisfied, the component-wise balance is not satisfied. For example, there is 1200 kmol/hr of phenol in feed, whereas distillate has 200 kmol/hr and bottoms has 1200 kmol/hr. Also, other components in the feed, like toluene and MCH, are not present in distillate and bottoms.

To Reproduce
Run the attached DWSIM File :
DC-Error.zip

Expected behavior
Component-wise mass balance should be satisfied.

Screenshots

Desktop (please complete the following information):

• Windows OS
• DWSIM v8.6.8

[DanWBR]

@nayakpriyam in the next release it will work with the napthali-sandholm solver + NRTL. UNIFAC is slow. Bubble Point algorithm converges to a wrong solution because of the strong non-indeality of the system. I'll add an additional mass balance check for all compounds.