Environmental-friendly castor oil (CO) and soybean oil (SO) were used as mixed diluents to spin polypropylene (PP) hollow fiber microporous membrane (HFMM) via thermally induced phase separation. With the addition of castor oil, the cloud point temperature gradually increases, and the region of liquid-liquid phase separation becomes larger. The membrane pore structure changes from a spherulitic form to a continuous sponge-like pore structure. Particularly, the effects of spinning process parameters (spinning speed, spinneret temperature and bore liquid temperature) on HFMM properties (e.g., mechanical properties, water contact angle, pore size and pore size distribution) and desalination performance of vacuum membrane distillation (VMD) were further studied. A higher spinning speed and smaller temperature difference between dope and spinneret/bore fluid increase pore size and reduce membrane porosity. The PP HFMM produced under the spinneret temperature of 160 °C, the bore fluid temperature of 113 °C, and spinning speed of 16.1 m/min reached relatively high VMD desalination performance both feeding 10 g/L NaCl solution (water flux 18.4 kg/m²·h and salt rejection 99.99 %) and petrochemical saline wastewater (water flux 14.0 kg/m²·h and salt rejection 99.5 %). This paper has important guiding significance for the mass production of PP HFMMs.

以环保蓖麻油（CO）和大豆油（SO）为混合稀释剂，通过热致相分离法纺制聚丙烯（PP）中空纤维微孔膜（HFMM）。随着蓖麻油的加入，浊点温度逐渐升高，液-液相分离区域变大。膜孔结构由球晶型转变为连续的海绵状孔结构。特别是纺丝工艺参数（纺丝速度、喷丝头温度和孔液温度）对HFMM性能（如机械性能、水接触角、孔径和孔径分布）和真空膜蒸馏（VMD）脱盐性能的影响是进一步研究。纺丝速度越高，涂料和喷丝头/孔流体之间的温差越小，孔径越大，膜孔隙率就越低。PP HFMM 在喷丝板温度 160 ℃、孔液温度 113 ℃、纺丝速度 16.1 m/min 条件下生产的 PP HFMM 在投加 10 g/L NaCl 溶液（水通量 18.4 kg/米² ·h 脱盐率 99.99 %）和石化含盐废水（水通量 14.0 kg/m ² ·h 脱盐率 99.5 %）。该论文对PP HFMMs的量产具有重要的指导意义。