Printech Archives, May, 1997: Re: Flashpoint shift

Re: Flashpoint shift

Wayne Pferdehirt (
pferdehi@epd.engr.wisc.edu)
Fri, 16 May 1997 12:38:55 -600


Jeff,

A little more on the DAA question:

The Merck Index states:
"Is dec. [decomposed?] by prolonged exposure to alkalies and by
distillation at atmospheric pressure."

It is also interesting to note the wide variation in reported flash
points for DAA. Merck Index says 151F for reagant grade, but says
flash point for commercial grades is 48F (closed cup) or 55F (open
cup).

Another fact sheet I found on DAA says:
"DAA is available in practical, technical and reagant grades. High
purity products are reported to be 99-100% pure with possible minor
impuriites of water and acetic acid. Practical/technical grades may
contain up to 15% acetone." (see
http://ntp-db.niehs.nih.gov/NTP_Reports/NTP_Chem_H&S_/NTP_MSDS/Hs_123
-42-2.txt)

Based on this, it appears that significant amounts of acetone may be
in commercial-grade DAA, substantially reducing the flashpoint from
that for pure DAA.

-Wayne


 

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