聚偏氟乙烯疏水平板膜用于真空膜蒸馏的研究

摘要

The self- made microporous hydrophobic membrane of polyvinylidene fluoride was used to research the performance of vacuum membrane distillation by changing the influencing factors such as the inlet water temperature, influent flow, the vacuum degree of the cold side and feed concentration. The result shows that the permeation flux of membrane increases with the increase of vacuum tightness(0.038 ~ 0.093 Mpa), feed flux(1.8 ~ 17.5 L/h)and feed temperature(40 ~ 65 ℃),and reaches the maximum flux at 39.22 kg/(m2·h). The permeation flux decreases while the reject rate increases with the increase of the concentration of feed( 1 ~ 40 g/L). The membrane flux is only 9. 59 kg/(m2 ? H) and the reject rate is 98.6% when the concentration is 40 g/L.%采用自制聚偏氟乙烯疏水平板膜,通过改变进水温度、进水流量、冷侧真空度及进料浓度等影响因素,对真空膜蒸馏的性能进行实验研究.结果表明,随进水温度(40～65℃)、进水流量(1.8～ 17.5 L/h)、冷侧真空度(0.038～ 0.093 MPa)的增加,膜通量呈增大趋势,最大可达39.22kg/(m2·h)；随进料NaCl溶液浓度(1～40 g/L)的增加,膜通量减小,截留率增加.在40g/L时,膜通量仅为9.59 kg/(m2·h),截留率达到98.6％.