As concerns the methyl acetate + methanol system, three
ILs have been examined as possible entrainers so far, namely
1-ethyl-3-methylimidazolium trifluoromethanesulfonate [EMIM]
[OTF] [11], 1-ethyl-3-methylimidazolium acetate [EMIM][Ac]
[12], and 1-octyl-3-methylimidazolium hexafluorophosphate
[OMIM][PF6] [13]. All were found to be capable of breaking the
azeotropic behavior of methyl acetate + methanol mixture and
providing its separation. Nevertheless, neither of these IL entrainers
appears to provide optimal performance that would qualify it
for a real industrial application: these ILs are either too viscous
([OMIM][PF6], [EMIM][Ac]) which would excessively increase
power requirements for their pumping and limit heat and mass
transfer rates, or contain fluorine ([OMIM][PF6] and [EMIM][OTF])
which would imply corrosion and environmental risks. Inspecting
the current portfolio of commercially available ILs, it turns out that
other IL structures might yield more convenient properties including
the separation selectivity itself.
As concerns the methyl acetate + methanol system, threeILs have been examined as possible entrainers so far, namely1-ethyl-3-methylimidazolium trifluoromethanesulfonate [EMIM][OTF] [11], 1-ethyl-3-methylimidazolium acetate [EMIM][Ac][12], and 1-octyl-3-methylimidazolium hexafluorophosphate[OMIM][PF6] [13]. All were found to be capable of breaking theazeotropic behavior of methyl acetate + methanol mixture andproviding its separation. Nevertheless, neither of these IL entrainersappears to provide optimal performance that would qualify itfor a real industrial application: these ILs are either too viscous([OMIM][PF6], [EMIM][Ac]) which would excessively increasepower requirements for their pumping and limit heat and masstransfer rates, or contain fluorine ([OMIM][PF6] and [EMIM][OTF])which would imply corrosion and environmental risks. Inspectingthe current portfolio of commercially available ILs, it turns out thatother IL structures might yield more convenient properties includingthe separation selectivity itself.
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