Expert ForumsDistillation

Topic: Re: The difference between cohobation and rectification columns

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I must admit I had not heard of the term Cohobation so I looked into it.  I found this: “Cohobation,” a word in alchemy and pharmaceutical chemistry that means “continuous distillation to extract the very essence of a compound substance.” From this and other various sites I visited, I concluded that a cohobation column is the same as a rectification column mostly on a laboratory scale and that the columns are not very sophisticated.  I’m not really able to determine exactly the column internals, but they appeared to be packed. However, one called a Vigreux column could be packed or not packed.  For more information, visit:  and 
I think the inquirer would be well served if he spoke with one of the vendors or contact someone in the pharmaceutical or essential oil industries.