Hi Mark
It looks like you're talking about distilling ethanol from water. It because these form an azeotrope with the ratio of 95% ethanol vs 5% water is as good as you can get without a third compound present that requires all of the fractional distillation. In my system there is just water with a salt present that does not form an azeotrope and there is only one fraction. Ken Gotberg --- On Sat, 8/7/10, Mark Ludlow <[email protected]> wrote: From: Mark Ludlow <[email protected]> Subject: Re: [Gasification] Can use some help with stoves To: "'Discussion of biomass pyrolysis and gasification'" <[email protected]> Date: Saturday, August 7, 2010, 5:31 PM All distillation is dependent on a heat source and a heat sink and the difference between their two temperatures. Multiple effect evaporators can have up to ten stages or more (if one can afford the hardware); fractional distillation usually requires high reflux rates. Vacuum exists to remove non-condensibles. It's the delta-T that, ultimately determines the overall efficiency; a sub-atmospheric operating pressures primarily makes heat exchange surfaces more efficient, according to Fourier's law which states that heat transfer across a given area is proportional to delta-T. Best, Mark _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org
