From: Tom Spicer <tos**At_Symbol_Here**UARK.EDU>
Subject: Re: [DCHAS-L] Data Sources for Aqueous Mixtures of Flammable Solvents...
Date: September 24, 2012 5:30:44 PM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <CAAszpkwVJtP2PfsYqFK4Leo9GFx1WQGHj=nv1+vmVS7wEq9UxA**At_Symbol_Here**>

I think you can get a reasonable estimate of the flash point using standard VLE estimates of the vapor phase composition of acetonitrile (in water) by setting the vapor phase composition to the LFL.  You would need to account for the fact that acetonitrile/water is a nonideal mixture.  At 141F, you should probably also account for the change in LFL with temperature.  Best regards, ts

Tom Spicer, PhD, PE
Professor and Ralph E. Martin Leadership Chair in Chemical Engineering
3202 Bell/CHEG
University of Arkansas
Fayetteville, AR  72701

479-575-7926 fax

On 9/24/2012 3:33 PM, Margaret Rakas wrote:
Good afternoon,

Short term question (give a woman a fish...):  Does anyone know the concentration at which an acetonitrile/water mixture has a flashpoint above 141F?  (From what I've found by reviewing MSDS's for products, even a 10% mixture apparently has a flashpoint around 80F...)

Longer term question (give a woman a fishing rod):  Is there a sourcebook for these sorts of data/mixtures?  

I have googled many different phrases today and spent an hour or more without success...

I have a PI receiving a radiolabelled compound in acetonitrile; it'll be much diluted by the time it's waste but I'd like to set a clear guideline along the lines of "At X% the material will not be considered mixed waste."

Many thanks-

Margaret A. Rakas, Ph.D.
Manager, Inventory & Regulatory Affairs
Clark Science Center
413-585-3877 (p)

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