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using a reflux what purpous, if any is there in clearing a wash totally??

For one the reflux will have a eisier job of stripping all the other stuff from the alcohol. Making it more efficent at its job.

It's not really necessary, some do some don't. You'll have to try it and decide for yourself.

i would have to say that clearing a wash will provide you with a more stable boil. Think of boiling piece wihch are placed inside your pot. if you have a ton of slugde kicking arounf the bottom it will not boil as effectivly. Also I would assume that the column (when doing large runs) may begin to lose effective plates since the packing will begin to get dirty. but i am not a chemist, I am only thinking out loud here..but I do know that the cleaner the wash the easier the clean up afterwards...

Clearing the wash could be desireable if you have an internal heating element to prevent scorching.