研究了BiCl3 HCl H2 O系蒸发过程馏余物的物相 ,结果表明 :馏余物物相随蒸馏温度的不同而不同 ,较低温度下蒸发馏余物物相除BiCl3以外还存在BiCl3·xHCl,而较高温度下蒸发馏余物中存在BiCl3和BiOCl两种物相。并探讨了形成不同馏余物物相的原因 The phase of the residue of the BiCl3 HCl H2 O system was studied. The results showed that the phase of the residue was different with the distillation temperature. In addition to BiCl3, there was still BiCl3 · xHCl , While the higher temperature evaporation of the existence of BiCl3 and BiOCl two phases. The reasons for the formation of different distillate phases were also discussed