DCHAS-L Discussion List Archive
Date: Thu, 11 Dec 2008 13:28:27 -0500
Reply-To: ILPI <info**At_Symbol_Here**ILPI.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Re: Glove box exhaust; heat sources in Organic labs
In-Reply-To: <E18BF132-D15C-4D30-A55B-B2CB354DDF15**At_Symbol_Here**uvm.edu>
1. Gloveboxes. When you regenerate the catalyst, you may blow a fair
amount of liquid (water and adsorbed organics) out, so the outlet from
the catalyst train should go to a trap to collect the liquid and then
vent to a fume hood. Later, you use a vacuum pump to make sure all
the Bad Stuff is pumped away, so make sure that is vented to the hood
as well. The manufacturer should be able to provide you with an
operating manual or may even have one on their web site.
The regeneration process uses forming gas, which is usually 96% inert
and 4% hydrogen (the exact ratio may vary), so your usual compressed
gas considerations come into play as well as the LEL for H2.
[DISCLAIMER: My company is a distributor for both Chemglass and Glas-
Col products]
2. If you go completely microscale, you can use resistively heated
aluminum blocks. See, for example: http://www.chemglass.com/product_view.asp?pnr=MW-114
. Heating mantles are a fairly reliable tool. I like them because it
is good for organic students to experience standard laboratory
equipment in their training (sounds like your philosophy with
"semimicro"). I have used sand in a heating mantle to assure a good
fit, although glass wool usually suffices.
Glas-Col makes a series of microscale mantles in 5, 10, 20, 25, 35, 50
and 100 mL for round bottoms, and 5,10, 25, 50, 65 and 100 mL for pear-
shaped flasks. See, for example, http://www.SafetyEmporium.com/?20352
and the Related Items section of that page.
Please note the Glas-Col is having a 10% across-the-board price
increase effective January 1, which is probably too soon for your
budgeting process, but I assume others on the list might appreciate
the advance warning.
You may also wish to check out my page on laboratory heating sources
at http://www.ilpi.com/inorganic/glassware/heatsources.html as well as
the glovebox entry at http://www.ilpi.com/inorganic/glassware/glovebox.html
Best regards,
Rob Toreki
On Dec 11, 2008, at 12:55 PM, List Moderator wrote:
> From: bmowery**At_Symbol_Here**ycp.edu
> Subject: Glove box exhaust; heat sources in Organic labs
>
> Date: December 11, 2008 10:52:04 AM EST (CA)
>
> I have two questions:
>
> 1. We are attempting to resurrect a glove box that has not been used
> in more than five years, and I have no recent experience with glove
> boxes. Where can I find information about exhaust requirements,
> especially after the regeneration of the catalyst? What other safety
> considerations I should be aware of?
>
> 2. We will be equipping a renovated Organic teaching lab sometime in
> 2009 Any thoughts on the use of Thermowells versus the Glass-col
> type heating mantles? I'm not thrilled with the idea of sand in the
> Thermowells to make one size fit several sizes of rbf. We use
> semimicro scale, 100 mL rbf max.
>
> Thank you.
>
> Barbara Mowery
> General Chemistry Laboratory Coordinator
> Physical Sciences Department
> York College of Pennsylvania
> 441 Country Club Road
> York PA 17403-3651
> 717-815-6480
> Fax 717-849-1653
=====================================================
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