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对制膜条件进行了优化控制，并在多孔支撑聚乙烯烧结管的外表面涂覆聚偏氟乙烯（ＰＶＤＦ）微孔膜，成功地制备出管式复合微孔膜，同时也为抑制ＰＶＤＦ在成膜过程中的形变提供了一个新的方法．利用自制的膜组件进行了生物酶制剂———腹蛇抗栓酶的膜蒸馏浓缩实验．结果表明，这种新型的管式膜具有许多优良的性能，如稳定、可靠性强、易于放大等．在透过侧压力为１３．３３ｋＰａ、温度为２０℃时，其通量可以达到７～１１ｋｇ／（ｍ２·ｈ），酶活的回收率达８４％．同时也表明低温膜蒸馏技术在热敏物质的分离、浓缩和提纯方面具有很大的发展潜力．
The membrane conditions were optimized and controlled. Polyvinylidene fluoride (PVDF) microporous membrane was coated on the outer surface of the porous support polyethylene sintered tube to successfully prepare the tubular composite microporous membrane. At the same time, Deformation during film formation provides a new method. The self-made membrane module was used to carry out the membrane distillation concentration experiment of the biological enzyme preparation-vestibular snake antithrombotic enzyme. The results show that this new tubular film has many excellent properties, such as stability, reliability, easy to enlarge and so on. When the permeate side pressure is 13.33kPa and the temperature is 20 ℃, the flux can reach 7 ~ 11kg / (m2 · h), and the recovery of enzyme activity can reach 84%. It also shows that cryogenic membrane distillation has great potential for the separation, concentration and purification of thermal materials.