Acidic glycol in solar thermal. [RE-wrenches]

[Peter Duchon]

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Don't know if this is appropriate, but could one simply add ammonia for a
"buffered" solution?

In other "chemical" circumstances, in the separation process for my mining
companies' pure silica from pure titania, we add ammonia to return the
titania side (dissolved as TiSO4) to a base.  Don't know what would happen
if added to acidic glycol, but ammonia will return many acids to base from
what I understand.

Of course, it never freezes down here so...

Peter

-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com]
Sent: Tuesday, May 30, 2006 3:56 AM
To: RE-wrenches at topica.com
Subject: RE: Acidic glycol in solar thermal. [RE-wrenches]

Here is my experiance and guesses.  I have tested many
systems, and find if the system is buffered, it lasts
in most systems for several years I have tested
several systems after 10 years (one after 20 years)
and found it to still have some reserve alklinity.
The systems that get the hottest go acid first.  I
used to use a double glased selective surface
collector that would go acid in one or two years (no
staganation protection on these systems)

Antifreeze without buffers, such as pure food grade or
even pure ethylene glychol fail because they do not
have a buffer added.  ( a buffer is alkline added to
nutralize the acid.)

If you have a system that has gone acid, dump it and
refill with a buffered solution.
Darryl

--- "Carl Emerson, Free Power Ltd."
<freepower at freepower.co.nz> wrote:

> Paul,
>
> We use food grade glycol and that can be expensive
> in a larger system...
>
> =====================================
>
> Drain it and refill?
>
> Carl Emerson, Free Power Ltd. wrote:
>
> >Hi there,
> >
> >If after a few years the mono-propylene glycol
> starts to become acidic in a
> >closed loop solar thermal system, what remedy is
> used to increase the pH,
> >any suggestions ??
> >
> >Thanks,
> >
> >Carl Emerson
> >Free Power Ltd.
> >Auckland NZ
> >

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