3 replies to this topic

[sschuette]

I work with a process in which liquid DIMETHYLISOPROPYLAMINE (DMIPA) is converted to a gas for use in curing a resin mixture. DMIPA is an amine which I believe is derived from ammonia. I am trying to find a practical way to recover the excess DMIPA gas back into a liquid so that it can be recycled back into the process. I have been trying to find a T-P Phase Diagram for DMIPA. I have also tried experimenting with DMIPA gas to see at what temperature it would begin to condense. So far I have not had very much success. I would appreciate any advice on how to return the DMIPA gas back into a liquid.

[pawan]

This chemical is having CAS# - 996-35-0.
Its boiling point is ~65°C

I have also tried experimenting with DMIPA gas to see at what temperature it would begin to condense.

So I am unable to understand your point. Once you are vaporizing it from liquid to vapors you must be having the boiling point at that pressure.

If you are interested in devising a recovery process then its a different issue & you need to provide more deatils.

[bmk]

I think while curing the resin the temperature of system rises and DMIPA is vaporized. If you want to recover the amine you may compress it to about 1.5 atm and try to condense it.

Alternatively, use Nitrogen pressure 1.5 atm to add DMAPA to resin mixture in a vessel with nitrogen blanketing pressure lower than 1.5 atm. The arrangement is likely to prevent vaporisation of amine and you will be able to avoid excess of amine.

---- bmkhare, M.Chem.Engg.

[Mehrdad]

I work with a process in which liquid DIMETHYLISOPROPYLAMINE (DMIPA) is converted to a gas for use in curing a resin mixture. DMIPA is an amine which I believe is derived from ammonia. I am trying to find a practical way to recover the excess DMIPA gas back into a liquid so that it can be recycled back into the process. I have been trying to find a T-P Phase Diagram for DMIPA. I have also tried experimenting with DMIPA gas to see at what temperature it would begin to condense. So far I have not had very much success. I would appreciate any advice on how to return the DMIPA gas back into a liquid.

Hi

you may try a spray chamber or direct intact condenser ,and to contact liquid DMIPA with vapor DMIPA for condensing the vapor then an aircooler for cooling the outlet of chamber to desired temperature.
a plan of your work is very useful and help all to give you a good suggestion.
regards