Bob87 Posted October 9, 2015 Share Posted October 9, 2015 reaction mixture where DMF is, in 50 degrees not under reflux, but just in closed glass? Link to comment Share on other sites More sharing options...
John Cuthber Posted October 9, 2015 Share Posted October 9, 2015 Possibly, but probably not safely. It depends what else is there. Link to comment Share on other sites More sharing options...
BabcockHall Posted October 9, 2015 Share Posted October 9, 2015 It is generally bad to heat a closed system. Could you have a drying tube present? Could you use a Firestone valve? Link to comment Share on other sites More sharing options...
GM11 Posted October 11, 2015 Share Posted October 11, 2015 No please dont do this, look at the vapour pressure. In a closed system this could be extremely unsafe. Can you give details of what you are trying to react or do? It is likely we can find a much safer and better way for you. Link to comment Share on other sites More sharing options...
John Cuthber Posted October 11, 2015 Share Posted October 11, 2015 The vapour pressure of DMF at 50 C is about the same as that of water at 20C and that's not going to do much. (Both are around 20 mmHg). The real question is what's the reaction? If it generates gas or causes the DMF to decompose then you have an issue. https://secure2.pnl.gov/nsd/NSD.nsf/CAS/D5F1E8C50B004BA688257592005ECA05/$FILE/DMF_25T.pdf?OpenElement Link to comment Share on other sites More sharing options...
GM11 Posted October 11, 2015 Share Posted October 11, 2015 The vapour pressure of DMF at 50 C is about the same as that of water at 20C and that's not going to do much. (Both are around 20 mmHg). The real question is what's the reaction? If it generates gas or causes the DMF to decompose then you have an issue. https://secure2.pnl.gov/nsd/NSD.nsf/CAS/D5F1E8C50B004BA688257592005ECA05/$FILE/DMF_25T.pdf?OpenElement Yes I should learn not to assume, obviously there is some kind of reaction. So I suggested in a succint way to go check the vapour pressure, as stated as well unless there is a very good reason closed systems are not good for heating. What is the glass? how thick? what is the reaction? How are people supposed to guess these things? Link to comment Share on other sites More sharing options...
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