Solid and liquid phase equilibria and solid-hydrate formation in binary mixtures of water with amines

Solid and liquid phase diagrams have been constructed for {water+triethylamine,or+N,N-dimethylformamide(DMF) or+N,N-dimethlacetamide (DMA)} Solid-hydrates form with the empirical formulae N(C2H5)3 3H2O,DMF 3H2O,DMF 2H2O,DMA 3H2O and (DMA)2 3H2O.All are congruently melting except the first which melts incongruently.The solid-hydrate formation is attributed to hydrogen bond.The results are compared with the references     

胺-水二元系固液相平衡及其水合物

测定了水+三乙胺,+N,N-二甲基甲酰胺(DMF),+N,N-二甲基乙酰胺(DNA)的固液平衡相图,3个体系均有固体水合物形成,它们分别是不相合熔点水合物N(C_2H_5)_3·3H_2O、相合熔点水合物DMF·3H_2O,DMF·2H_2O,DMA·3H_2O和(DMA)_2·3H_2O.对水合物的形成进行了分析并与文献结果相比较.