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研究了聚丙烯中空纤维微孔膜（PPHM）减压膜蒸馏（VMD）对0．51mol／LNaCl水溶液的分离性能．实验表明，在40～65℃盐水温度范围内，两个膜组件的脱盐效率接近100％，蒸馏通量J随盐水温度的升高而增大，J与膜两侧的蒸汽压差△p成线性关系．PPHM的装填密度不同时，器件的蒸馏系数Km没有明显差别，但装填密度较低时膜两侧的△p较大，使得J较大，表明渗透过蒸汽在膜下游的传质对蒸馏通量有很大影响．
The separation performance of 0.51 mol / L NaCl aqueous solution by polypropylene hollow fiber microporous membrane (PPHM) vacuum membrane distillation (VMD) was studied. Experiments show that in the temperature range of 40 ~ 65 ℃, the desalination efficiency of the two membrane modules is close to 100%, and the distillation flux J increases with the increase of brine temperature. Linear relationship. When the packing density of PPHM is different, the distillation coefficient Km of the device has no obvious difference, but △ p of the two sides of the membrane is larger when the packing density is lower, making J larger, indicating that the mass transfer of the permeated steam downstream of the membrane has a great influence on the distillation flux have a great impact.