| 摘要 |
PURPOSE:To separate dimethylformamide from a mixed solvent at a low cost, by utilizing the formation of a molecular clathrate, consisting of dimethylformamide and a diol or monool and having a shift of the infrared absorption peak of OH group within a specific range. CONSTITUTION:A molecular clathrate complex, consisting of dimethylformamide and a diol or monool and having the absorption peak of OH group at a position shifted to the side of 100-230cm<-1> shorter wavelength than the absorption peak of an infrared absorption spectrum assigned to stretching vibration of OH group of the diol or monool. A substance capable of forming the above- mentioned complex, e.g. a diol expressed by formula I or monool expressed by the formula II (R is H or methyl) is brought into contact with a dimethylformamide-containing solution to form the molecular clathrate complex, which is then separated from the mixture solution. The dimethylformamide is further eliminated from the separated clathrate complex. If the shift of the absorption peak of the OH group is within the above-mentioned range, separation of the solvent can be efficiently carried out.
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