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Previous by Date: Subject: Re: [DCHAS-L] oil baths use Date: January 31, 2013 3:54:36 PM EST Author: ILPI Support |
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Yung,
Back in my undergraduate schooling days, I accidentally set a small mineral oil bath on fire for an addition reaction. My temperature application was 250C and the only oil we had at the time was mineral oil, who's flash point is 168C.
After the fire, we switched to silicone oil, who's flash point is 316C, where the flash point is greater than my reaction temperature.This oil bath worked out for me, however please note, silicone oil is more expensive than mineral oil ($709 USD per 2.5L bottle.
Anything higher than 300C will require Nickel-Chrome heating wire, sand or glass bead baths. It is difficult to regulate the temperature on solid bath, as solids do not heat uniformly (the bottom of the sand is hotter than the top of the sand). Liquids are easier to heat uniformly when stirred.
Please also note, once an oil bath has been contaminated with a flammable solvent, the flash point of the contaminated oil is unknown.
Michael Ng
Environmental Health and Safety Manager
Long Island University Brooklyn Campus
Buildings and Grounds
1 University Plaza M101
Brooklyn, NY 11201
Tel: (718)-488-1608
Fax: (718)-488-3337
michael.ng**At_Symbol_Here**liu.edu
Dear members,
I was wondering if I can tap on the group expertise and wisdom on the use of Oil baths. We have had a few small fires due to overheating or faulty thermostat. In your opinion, how often oil baths must be changed? What type of oil (not too expensive) is recommended? What do you suggest replacing them with ? I have heard: beads, sand etc.. Please share any experience you may have with oil baths substitutions. Do they work to heat up solvents evenly?
Again, thank you for all ideas or suggestions you may have. Keep up the great work you do.
Best regards,
Yung Morgan, MsPH
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From: Yung Morgan
Reply-To: DCHAS-L
Date: Thu, 31 Jan 2013 13:20:04 -0500
To:
Subject: [DCHAS-L] oil baths use
Laboratory Safety
Industrial Hygiene Services
Environmental Health and Safety
117 Draper hall
UMASS,Amherst MA 01003
phone (413) 545-2682
Fax (413) 545-2600
email : pmorgan**At_Symbol_Here**ehs.umass.edu