A two-layer polyetherimide ultrafiltration membrane was fabricated by a double-blade casting technique and used for separation of the toluene–water emulsion. The cross-linking process was used to make membranes chemically stable when exposed to solvents. Membranes with different top layer thickness ranging from 40 to 10 μm were selected for toluene–water separation. These membranes were fabricated in a way that they would have maximum flux while having pore sizes in the tight ultrafiltration range. The results revealed that the two-layer membranes showed higher flux when used for filtration of the toluene–water emulsion so that toluene/water mixture flux increased from 1.27 L m⁻² h⁻¹ for the single-layer membrane to 3.19 L m⁻² h⁻¹ for the two-layer membrane with 20 μm of top layer thickness. Also, toluene rejection improved from 94.11% for the single-layer membrane to 95.25% for the two-layer membrane with 20 μm top layer thickness. Moreover, the total resistance against water permeation in the two-layer membranes was lower than that in the single-layer membranes. To evaluate the long-term chemical stability of the membranes, they were immersed in a mixture of toluene and water for 5 days. Then again, they were used for filtration of the toluene–water emulsion. It was shown that these membranes could significantly preserve their performance which is a sign of good resistance against toluene.

通过双叶片流延技术制备了两层聚醚酰亚胺超滤膜，用于分离甲苯-水乳液。当暴露于溶剂时，使用交联工艺使膜化学稳定。选择不同顶层厚度从40到 10μm的膜进行甲苯-水分离。这些膜的制造方式使其具有最大的通量，同时孔径在紧密的超滤范围内。结果表明，当用于过滤甲苯-水乳液时，两层膜的通量更高，因此甲苯/水混合物的通量从单层膜的1.27  L  m ^-2  h ^-1增加到3.19  L  m 对于顶层厚度为20μm的两层膜，为^-2 h ^-1 。而且，甲苯排斥率从单层膜的94.11％提高到 顶层厚度为20μm的两层膜的95.25％。而且，两层膜的总的耐水渗透性低于单层膜。为了评估膜的长期化学稳定性，将其浸入甲苯和水的混合物中5天。然后，它们又被用于过滤甲苯-水乳液。结果表明，这些膜可以显着保持其性能，这是对甲苯具有良好抵抗力的标志。