Considering that the temperatures between the both sides of the membrane are quite close or even the same in osmotic distillation system

there is no phase inversion heat loss in this process. It is possible to achieve a lower energy consumption of membrane distillation process. Therefore

the study on seawater desalination by osmotic distillation was carried out. Firstly

the osmotic distillation experiments were proceeded with the seawater as feed solution

the glucose solution and calcium chloride solution as extractant in seawater desalination. The result showed that the membrane flux of calcium chloride solution as extractant was higher than that of glucose solution. Then the heat and mass transfer model of osmotic distillation was founded

based on which the calculation was carried out. The result showed that the model predictions were in good agreement with the experimental data. Thirdly

The impact of glucose solution or calcium chloride solution as extractant to mass transfer coefficient and polarization phenomenon was calculated. The result revealed that the mass transfer coefficient of calcium chloride solution as extractant is 1.7 times of glucose solution and the reduced value of the steam pressure difference by polarization phenomenon is a quarter of that for the latter.