From: Michael D Ahler <mahler**At_Symbol_Here**HANCOCKCOLLEGE.EDU>
Subject: Re: [DCHAS-L] Heating tape for DMSO column
Date: Wed, 30 Sep 2015 21:48:40 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 99080534A99D89479A51A4EB6489672E05F7296D**At_Symbol_Here**


How difficult would it be to arrange for the DMSO to pass through a water jacketed column?   A warm water source at 30 - 40  degrees C pumped slowly through an outer jacket should keep the DMSO liquid for a good while.    Without knowing the mass or flow rate of the DMSO involved, my engineering answer is a little soft, but a heat capacity of 0.47 for 30 degree DMSO is respectable enough, I think, to keep things flowing.   A big warm water reservoir will help greatly - perhaps heated remotely with a hot plate or just use the domestic hot water that flows in the building. 

Good Luck.

Michael Ahler
Part-Time Faculty Member
LPS (Chemistry), Allan Hancock College
Also retired CHO, Cal Poly San Luis Obispo

From: DCHAS-L Discussion List [dchas-l**At_Symbol_Here**] on behalf of Debbie M. Decker [dmdecker**At_Symbol_Here**UCDAVIS.EDU]
Sent: Wednesday, September 30, 2015 1:00 PM
Subject: [DCHAS-L] Heating tape for DMSO column



My newest researcher will be using a column purification system to purify his suite of solvents for organic synthesis.  One of those is DMSO.  It freezes at about room temperature.  He wishes to use a heating tape to keep it gooey enough to go through the column.  Here's what he's proposing to use:


I'm inclined to say go ahead, so long as he installs this column at the end of the rack and in proximity to the least flammable of the other solvents.  I'm also wondering if he should just have it on at low temperature all the time or wait until they have a problem and then thaw it using a heat gun.  I don't like the heat gun idea, particularly, but there are also risks associated with having something heating all the time.


What do ya'll think?





Debbie M. Decker, CCHO, ACS Fellow

Chair, Division of Chemical Health and Safety

University of California, Davis





Birkett's hypothesis: "Any chemical reaction

that proceeds smoothly under normal conditions,

can proceed violently in the presence of an idiot."


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