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Subject:	Re: Is Oxalic Acid Vaporization Harmless?
From:	randy oliver <[log in to unmask]>
Reply To:	Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:	Wed, 30 Oct 2019 12:12:31 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (26 lines)

> The oxalic acid desublimes to a fog of oxalic acid crystals the instant
the temp drops a bit and that is within an inch or less of the sublimer as
near as I can tell.

Agreed.  I'm done some experimentation to quantify the amount of OA that
degrades due to heat.  I use mylar balloons -- injecting the exiting vapor
directly into the balloon.  There is initially zero inflation of the
balloon from the blast of "vapor," since the vapor immediately condenses
into a fog of crystals.  It's not until the temperature of the vaporizer
exceeds 190C that the balloon starts to inflate, presumably from the
degradation products CO2 and formic acid.

I just purchased a bunch of mylar balloons and a microscale to pursue this
avenue of research.


-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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