Novec and other HFCs and HFEs are very poor solvents by themselves and
have to be blended with trans-DCE, a fairly toxic chlorinated solvent,
similar to TCE to have much effect. If I were you, I'd be looking at
aqueous solutions.
Brian
Kane, Amol (349) wrote:
> Thank you for the very enlightening responses from Technet (as always). I am also investigating alternate solvents to use for (hand) scrubbing boards prior to coat (to remove light oils, finger prints and flux residues (if any) from hand soldering operations etc.)
>
> Currently looking at the 3M Novec line of cleaning fluids. What are y'all using out there?
>
> Thanks,
> Amol
>
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: Saturday, June 27, 2009 2:10 AM
> To: TechNet E-Mail Forum; Kane, Amol (349)
> Subject: Re: [TN] Alcohol Distillation
>
> The thing that shocks me is not the desire to distill IPA but the fact
> that you USE IPA before conformal coating. It is not a good defluxer.
>
> Distillation is not easy. The Black Foresters gather cherries and put
> them in large tubs for a few weeks and then distill the fermented juice.
> They never get pure alcohol, but a deliciously perfumed eau-de-vie
> called Kirschwasser with a distinct aroma of the cherries it was derived
> from. Why? Because of azeotropes. Even a mixture of ethanol and water
> will not distill into pure alcohol but into a mixture of about 96% EtOH.
> Rudy mentions esters; these are the reaction products between alcohols
> and acids and it is what gives Kirschwasser its aroma and flavour.
> Esters usually form azeotropes with alcohols and it is not impossible
> for raw organic acids to do so as well. So distillation may remove most
> of the rosin but the resultant juice may not be brilliant as a safe
> defluxer, possibly even worse than not cleaning at all.
>
> Apart from which, alcohol vapours and air can form a highly explosive
> mixture. H&S regulations would require you to install such a still in an
> explosion-proof bunker KABOOOOM!
>
> Brian
>
> Kane, Amol (349) wrote:
>> I am looking for some information from people who own a alcohol distillation unit that converts alcohol waste (alcohol + fluxes etc.,) into usable alcohol again. I know that such a unit exists, but need to talk to people who actually use it. We are trying to limit the amount of IPA waste we generate from clean boards prior to CC.
>>
>> Offline replies are welcome too.
>>
>> Thanks and regards,
>> Amol
>>
>>
>>
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>
> WARNING: Export Control
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