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From: Nathan Watson <00001bbbf7dfbccd-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: [DCHAS-L] Input on chemical incident
Date: Feb 9, 2024 18:16 UTC
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: <C821D78C-3F84-4D2C-95E3-03C8BB96AFD8**At_Symbol_Here**scishield.com>
In-Reply-To:
Hi Alex,
With no visible signs of polymerization, it seems that the more likely scenario is:
High vapor pressures of methanol and ethyl acetate + small ullage + increase in temperature of mixture in the container
Cause of the increase temperature could be:
* polymerization could have occurred due to mixing in oxygen during disposal + light exposure or presence of catalyst.
Hope this line of thinking helps with your investigation.
Best,
Nathan
Nathan Watson
President & CEO | SciShield
(617) 475-9279
The Scientific Organization’s Choice for Safe and Productive Labs.
From:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of Alex Hagen <fischera**At_Symbol_Here**UW.EDU>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Date: Thursday, February 8, 2024 at 5:23 PM
To: "DCHAS-L**At_Symbol_Here**Princeton.EDU" <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: [DCHAS-L] Input on chemical incident
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Good morning,
We had a small hazardous waste incident in one of our labs recently, and I am trying to help the lab gather information on potential causes. A four-liter amber glass bottle of chemical waste containing 50% methanol, 44% ethyl acetate, and
an assortment of six p-phenylenediamine antioxidants (PPDs) pressurized and broke open. The bottle was tightly capped and very full, it only had about 1.5 inches of space left at the top. The bottle broke open at the bottom of the bottle in a jagged formation.
No polymerization of the contents was observed, but some speculated an event like that could have led to the pressurization of the container. I have already informed the lab that they should not fill waste containers more than 80%.
I have not been able to find information on similar events involving PPDs. Any input or information this group could provide about what may have led to this event is greatly appreciated.
Regards,
ALEX HAGEN, CCHO
Laboratory Safety Inspection Program Manager
Environmental Health & Safety Department
Research & Occupational Safety, Laboratory Safety Inspection Program
Hall Health / Box 354400 / Seattle, WA 98195-4400
206.221.2339 / mobile 206.713.5267 / fax 206.616.3360
fischera**At_Symbol_Here**uw.edu /
www.ehs.washington.edu
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