r glycerine 61 6 78 8 104 5 09adiponitrile r __________________________________________________________________________ the ratios shown in tables i ii and iii are the parts by weight of extractive agent used per part of isopropyl ether methyl ethyl ketone mixture and the two relative volatilities correspond to the two different ratios for example in table i one part of ethylene carbonate with one part of isopropyl ether methyl ethyl ketone mixture gives a relative volatility of 8 91 6 5 parts of ethylene carbonate gives 8 35 one half part of adiponitrile mixed with one half part of 1 4 butanediol with one part of the isopropyl ether methyl ethyl ketone mixture gives a relative volatility of 6 59 3 5 parts of adiponitrile plus 3 5 parts of 1 4 butanediol gives 6 31 one third parts of adiponitrile plus 1 3 parts of dmso plus 1 3 parts of ethylene glycol mixed with one part of isopropyl ether methyl ethyl ketone mixture gives a relative volatility of 6 68 with 2 5 parts these three give 7 02 table iii lists a few combinations of some of the same compounds presented in tables i and ii which failed to give relative volatilities as high as 3 0 this is principally due to the formation of two phase azeotropes which have the effect of bringing the extractive agent as part of the overhead several of the compounds and mixtures listed in tables i and ii and whose relative.