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pintoshine wrote:I can show evidence of the negligibility of column insulation as a design criteria.
The McCabe-Thiele approach is a graphical one, and uses the VLE plot to determine the theoretical number of stages required to effect the separation of a binary mixture. It assumes constant molar overflow and this implies that:
-molal heats of vaporisation of the components are roughly the same
-heat effects (heats of solution, heat losses to and from column, etc.) are negligible
-for every mole of vapour condensed, 1 mole of liquid is vaporised
many of the columns are insulated
How do you get rid of the excess heat and achieve a heat gradient required for the fractions?
pintoshine wrote:You know I forgot to ask some questions.
You guys have to tell me what it is that the insulation is supposed to improve.
I am curious to see if the myth is busted.
junkyard dawg wrote:The temperature gradient is determined by the mash. The column and packing and insulation function to reflux and redistill at what ever temperature the boiler is providing. Most of us are not developing a wide temp gradient were we could draw different products at different levels. We are only making a big column that will effectively redistill whatever is refluxed back to it...
junkyard dawg wrote:I'd rather hear if you've tried using an insulated column... It seemed like an improvement when I insulated... have you had a negative experience with insulation?
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