| About This Archive | | DCHAS-L 2017 Index | | DCHAS-L Yearly Index | |
Check out Safety Emporium for your N95, N99, and face shield needs.
|
Previous by Date: Subject: Re: [DCHAS-L] Fume Hood Ducting Date: Friday, October 13, 2017 at 10:30:15 AM Author: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> |
Next by Date: Subject: [DCHAS-L] HF concentration and gluconate gel Date: Fri, 13 Oct 2017 14:46:51 +0000 Author: Jeffrey Lewin |
Excellent point!
It is all about the proper use of the vacuum pumps and maintenance. A properly maintained vacuum pump and free from chemical contaminations will not generate lot of mist. When
we do not use a proper trap (LN2) and use the vacuum pump for removing the low boiling solvents, solvents will enter into pump system and oil, eventually changing the viscosity of the oil and overheating of the system.
Same practices should be applied to the oil baths inside a chemical fume hood (no polymerization).
Tilak
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Monona Rossol
Sent: Friday, October 13, 2017 8:50 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Fume Hood Ducting
Anyone who cleans the area around a stove in any house should be well aware that oils of all kinds volatilize and/or form mist particulates and deposits on surfaces.
What do you think that nasty grease is all over your cabinet doors? Why do you think commercial kitchen hoods are called "grease hoods" and methods of cleaning the grease out of them and their filters is part of every restaurant maintenance schedule?
Take your chemistry head with you where ever you go.
Monona Rossol, M.S., M.F.A., Industrial Hygienist
President: Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
181 Thompson St., #23
New York, NY 10012 212-777-0062
-----Original Message-----
From: Laurence Doemeny <ldoemeny**At_Symbol_Here**COX.NET>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Thu, Oct 12, 2017 9:39 pm
Subject: Re: [DCHAS-L] Fume Hood Ducting
Yes it is reasonable and possible for mineral oil, even at room temperature, to evaporate and condense on the duct work. Researchers working with high vacuum lines put low temperature traps on the low pressure
side of the pump to prevent oil entering the system. While the vapor pressure of mineral oil is low it is significant that over time an oil film can develop on various surfaces.
This reference is not directly related to your observation but it does show that mineral oil does evaporate.
https://www.cdc.gov/niosh/nioshtic-2/00229101.html
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Elizabeth Brubaker
Sent: Thursday, October 12, 2017 1:14 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] Fume Hood Ducting
Has anyone experienced accumulation of oil (perhaps mineral oil from a heated oil bath?) in fume hood duct work? Is this reasonable or even possible? Could a sufficient amount remain in the system for it to condense
out in the ducts when the exhaust fans were turned off for an extended period?
--
Beth Brubaker
Laboratory/Safety/Waste Coordinator
Murray State University Department of Chemistry
2226 Jesse D. Jones Hall
Murray, KY 42071-3300
(270) 809-6390
--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at
secretary**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at
secretary**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at
secretary**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
Previous post | Top of Page | Next post