Homebrew PCBs

"Azeotropic" ?

There's another term I never heard before. Another thing to read and learn!
Thank you!

Nuno T.

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: sexta-feira, 8 de Janeiro de 2016 1:22
To: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] Heatless (cold) Toner Transfer for PCB making

To get past 95.6% requires something other than distillation to separate the
alcohol from the water. At 95.6%, the ethanol and water boil off
simultaneously at the same temperature (it's an azeotropic mixture; look it
up if you want to know more) and the concentration just doesn't change any
more.

<https://en.wikipedia.org/wiki/Ethanol#Purification> has a good writeup.

Donald.

----- Original Message -----
> From: "'keith printy' keethpr@... [Homebrew_PCBs]"
<Homebrew_PCBs@yahoogroups.com>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, January 7, 2016 7:41:02 PM
> Subject: RE: [Homebrew_PCBs] Heatless (cold) Toner Transfer for PCB making
> 
> To get it past 96% maybe they distill the alcohol again to further reduce
the
> water content ?  remember alcohol boils at a lower temp than water that is
> how a still leaves the water behind. I would think the alcohol is only
being
> used in the toner transfer process as maybe a carrier?  Most toners I have
> seen are polyester based and acetone will dissolve them. You can for
example
> clean vinyl with acetone but you must dilute with water or it will
dissolve
> it.
> 
>  
> 
> From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
> Sent: Tuesday, January 05, 2016 11:01 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] Heatless (cold) Toner Transfer for PCB making
> 
>  
> 
>   
> 
> WOW, that’s really expensive! $144.10 per liter + hazardous material fee +
> shipping.
> 
> Jean-Paul
> N1JPL
> 
> > On Jan 5, 2016, at 9:18 PM, Roger Blair Roger.Blair@...
> > [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
> > 
> > FYI...
> > http://www.sciencelab.com/page/S/PVAR/SLE2248
> > 
> > General Chemical Specifications: Assay (C2H5OH; by Volume) Min. 99.5%
Water
> > (H2O)0.2%
> > Roger Blair
> > 
> > On 1/5/2016 5:43 PM, Jean-Paul Louis louijp@... [Homebrew_PCBs]
> > wrote:
> >> 
> >> Pure Ethyl Alcohol (Ethanol) will be the hardest to find in the US. All
> >> the pharmacies in the US now carry IPA (Iso Propyl Alcohol) which is
not
> >> Ethanol. 96% purity limit for current ethanol is not by accident. It is
> >> the maximum purity that you can obtain by distillation. In order to get
> >> 99%, you need to use a different process that will go beyond the 96%
> >> limit. I do not know the english name of the process.
> >> When I was in France, 99% Ethanol was available at any pharmacy and was
> >> called “Alcool rectifié” which translate approximately by rectified
> >> alcohol.
> >> 
> >> My $0.02,
> >> Jean-Paul
> >> N1JPL / ex-AC9GH
> >> 
> >> > On Jan 5, 2016, at 7:02 PM, alienrelics@... [Homebrew_PCBs]
> >> > <Homebrew_PCBs@yahoogroups.com> wrote:
> >> > 
> >> > It says Ethyl Alcohol, which is often denatured. Not everyone uses
the
> >> > same denaturing agents.
> >> > 
> >> > 
> >> > However, in one of the comments he says:
> >> > "The one I use is Ethyl alcohol (pure 96%) also called Ethanol. It's
the
> >> > one used as antiseptic."
> >> > 
> >> > Medical Ethyl alcohol seems to be about 95% or so.
> >> > 
> >> > Hardware store denatured alcohol seems to be about 90%.
> >> > https://en.wikipedia.org/wiki/Denatured_alcohol
> >> > 
> >> > Some people in the comments mentioned Everclear. It seems to be sold
in
> >> > 75.5% (151 proof) and 95% (190 proof).
> >> > 
> >> > Steve Greenfield AE7HD
> >> > 
> >> > 
> >> 
> >> 
> > 
> > 
> > 
> 
> 
> 
> 


------------------------------------
Posted by: Donald H Locker <dhlocker@...>
------------------------------------

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