Song Qiang, Kang Jian, Tang Min, Liang Yun
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China.
State Key Laboratory of NBC Protection for Civilian, 35 Huayuan Rd. N., Beijing 100191, China.
Materials (Basel). 2020 Jun 11;13(11):2667. doi: 10.3390/ma13112667.
Traditional water-repellent filter media for water separation in diesel fail to meet requirements due to the high content of surfactants in low sulfur diesel and ULSD (ultra low sulfur diesel). To improve the water separation performance of filter media, a novel dual-layer filter medium was prepared by hydrophilic fibers (glass microfibers) and hydrophobic fibers (kapok fibers and bi-component PET fibers). The results showed that the separation efficiency of a filter medium (sample #2) with the upstream layer containing 20 wt% kapok fibers was 89.5%, which was higher than that of filter samples with the upstream layer containing 0 wt%, 40 wt%, 60 wt% and 80 wt% kapok fibers. When the interfacial tension (IFT) of water in diesel was 21 mN/m, 17 mN/m and 13 mN/m, the separation efficiency of filter sample #2 was 99.5%, 89.5% and 30.5%, respectively, which was 23.9%, 57.4% and 17.8% higher than that of the commercial water-repellent filter samples composed of a polybutylene terephthalate (PBT) fiber layer and cellulose fiber layer.
传统的用于柴油中水分离的疏水过滤介质，由于低硫柴油和超低硫柴油（ULSD）中表面活性剂含量高，无法满足要求。为了提高过滤介质的水分离性能，采用亲水性纤维（玻璃微纤维）和疏水性纤维（木棉纤维和双组分PET纤维）制备了一种新型双层过滤介质。结果表明，上游层含有20 wt%木棉纤维的过滤介质（样品#2）的分离效率为89.5%，高于上游层含有0 wt%、40 wt%、60 wt%和80 wt%木棉纤维的过滤样品。当柴油中水的界面张力（IFT）为21 mN/m、17 mN/m和13 mN/m时，过滤样品#2的分离效率分别为99.5%、89.5%和30.5%，分别比由聚对苯二甲酸丁二醇酯（PBT）纤维层和纤维素纤维层组成的商用疏水过滤样品高23.9%、57.4%和17.8%。
