RE: [Distillers] Black Gunge and Cleaning
From: Distillers@yahoogroups.com [mailto:Distillers@yahoogroups.com] On Behalf Of burrows206
Sent: Wednesday, 31 May 2006 9:59 a.m.
Subject: [Distillers] Black Gunge and Cleaning
Hi fellow stillers,
I distilled a 48 hr Turbo Pure in my valved reflux still on
Sunday and got a thickish black crud on the inside wall of my 3"
condenser pipe. I can clean it off when I scrub everything down and
set up for my next run. But I'm a little worried as to what is
causing this. I must be doing something wrong? Or am I?
From my wine distilling days I have a lot of Campden tablets
(Sodium Metabisulphite 92.5% Macragol 7.5%)
Now if I add 2 tea spoon fulls of lemon juice to 6 crushed
Campden tablets to a pint of water will this successfully clean off
the crud as well as sterilize the whole column. (It will also
clean whatever sensation you might retain in your nose, it's a bit
like getting a good whiff of Ammonia if the wind is blowing the
Feed back is needed and wanted before i try this. I know this will
sterilize bottles and fermenting equipment on one pass, but it is
corrosive. What will it do with continuous use on copper pipe? I
just want to use all these flipping Campden tablets if I can and
clean the still at the same time. You can now come to my rescue all
you outlaw chemists
My understanding is it is Ok with glass, stainless steel, plastic fermenters etc I recall reading on this forum some time ago that Sodium Metasulphite and copper produce a “NASTY” compound maybe Harry or others could direct you to the thread.
Cheers Ken Mc
- --- KM Services <km_services@...> wrote:
metabisulphite + acid = sulphur dioxide
this plus copper = copper sulphite which is soluble in water.
Thus, what you are doing is stripping a layer of copper off every time
you clean. Not good if you do it too often, or leave it too long.
I's keep the tabs for glassware and plastic.
I have a suspicion that the black "crud" may be caused by the reaction,
as well as removed by it. Make sure you rinse very well with hot water
after cleaning to remove leftover cleaning solution.
I'm thinking it is similar to the way copper roofs etc go black in
smoggy areas instead of a nice verdigris green.
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