Multi-bore hollow fiber membranes were prepared through phase inversion spinning process using new locally designed spinnerets of various geometrical shapes. The spun cylindrical-like, rectangular or ribbon-like, and triangular-like are prepared, dried, and characterized by scanning electronic microscope. Fibers of circular (seven, five, and four bores) shape, rectangular of five bores, and triangular of three bores were chosen to study the effect of both geometrical configuration and the number of bores on the amorphous structure and the mechanical properties of the membranes. Membrane geometry, surface amorphous, and bore arrangements are very sensitive to the operating conditions, especially the extrusion and drawing rates. Three polymeric blends of different compositions are used to prepare multi-bore hollow fiber membranes. This study revealed that the blend composition of PES 16%, PVP 2%, PEG 2%, diethylene glycol 2%, and NMP 78% gives excellent mechanical properties. Optimization of the preparation conditions also developed, where the dope flow rate, the bore flow rate, and the air gap were 1.14 cm 3 s −1 , 1.1 cm3 s −1 , and 0 cm, respectively. Furthermore, this study proved that the circular arrangement has high mechanical strength. The prepared seven-MBHF membranes were applied in the membrane distillation process, a solution of 35 g/l NaCl was used to test the membrane performance, and the achieved flux and rejection were 28.32 L/m 2 h and 98.9%, respectively. This performance demonstrated that the prepared membrane in this way is suitable to compete with conventional reverse osmosis technology that uses single track hollow fibers.

中文翻译：

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不同几何形状多孔中空纤维膜的制备、表征及其在真空膜蒸馏中的应用

多孔中空纤维膜是通过使用新的局部设计的各种几何形状的喷丝头通过转相纺丝工艺制备的。将纺成的圆柱状、矩形或带状、三角形状制备、干燥，并用扫描电子显微镜进行表征。选择圆形（七孔、五孔和四孔）纤维、五孔矩形纤维和三孔三角形纤维来研究几何构型和孔数对膜的无定形结构和机械性能的影响. 膜几何形状、表面无定形和孔排列对操作条件非常敏感，尤其是挤出和拉伸速率。三种不同组成的聚合物共混物用于制备多孔中空纤维膜。该研究表明，PES 16%、PVP 2%、PEG 2%、二甘醇 2% 和 NMP 78% 的共混组合物具有优异的机械性能。还开发了制备条件的优化，其中涂料流速、孔流速和气隙分别为1.14 cm 3 s -1 、1.1 cm3 s -1 和0 cm。此外，该研究证明圆形排列具有高机械强度。将制备的7-MBHF膜应用于膜蒸馏过程，用35 g/l NaCl溶液测试膜性能，实现的通量和截留率分别为28.32 L/m 2 h和98.9%。这一性能表明，以这种方式制备的膜适合与使用单轨中空纤维的传统反渗透技术竞争。