Activity coefficients at infinite dilution of {N-methyl-2-pyrrolidinone (NMP), orN,N- dimethylformamide (DMF), or dimethyl sulfoxide (DMSO)+ 1-heptyne, or 1-octyne } using comparative ebulliometry

The determination of activity coefficients at infinite dilution using g.l.c. for hydrocarbons in furfural at T=278.15 K and T=298.15 K

“…The values of S 1 ij in table 4 are comparable, in magnitude, to the S 1 ij value for hexane and benzene in N -methylpyrrolidinone, (NMP) [8]. This value is 12.5.…”

“…A sample of the raw data obtained for one of the 22 sets of table 3 and were each determined from at least five points over a period of between half an hour and four and a half hours. The estimated error in c 1 13 , as calculated in previous work of this nature [4,5,8], is better than 4%.…”

Activity coefficients at infinite dilution for hydrocarbons in furfuryl alcohol at T=(278.15 and 298.15) K, determined by g.l.c.

“…Equation (1) is a modified form of the Everett and Cruickshank equation [1,2,6] and takes into account the volatility of the solvent.…”

“…These dissociation effects are also reflected in the large H E1 1 values. The values of S 1 ij in table 4, are relatively large and can be compared to the S 1 ij value (of 12.5) for hexane and benzene in N-methyl-pyrrolidinone [1]. The latter compound is used commercially for the separation of aromatics from alkane compounds.…”

“…Highly polar solvents such as sulfolane and N-methyl-pyrrolidinone, which also have low volatility, are used to effect such separation [1]. Furfuryl alcohol (C 5 H 6 O 2 ) is a polar solvent with a high boiling point (443.2 K) and low vapour pressure, and as a result, has the potential of being a good solvent for separating aromatic and aliphatic compounds.…”