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A new technique for preparation of PDMS/ceramic nanocomposite membrane for gaseous hydrocarbons separation

机译：PDMS /陶瓷纳米复合膜分离气态烃的新技术

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摘要

A novel composite membrane using polydimethylsiloxane (PDMS) as a top active layer and ceramic nanocomposite as the support layer was developed for the gaseous hydrocarbons separation. For the fabrication of hybrid membranes, nanocomposite technology applied for manufacturing ceramic supports with controllable microstructures. Also, a new method was used for coating a uniform and no penetrated polymeric layer. Top layer of ceramic support with nanocomposite microstructures was fabricated using 5 wt % α-Al _2O _3-SiO _2 bidispersed suspensions with optimum weight fraction of second phase (SiO _2) based on the fractional collision frequency theory. PDMS selective layer was coated on the outer surface of the porous ceramic nanocomposite support by dip-coating method. In this respect, the effect of several parameters such as pretreatment temperature, PDMS solution concentration, and number of coated polymeric layers on prepared layers morphology and hybrid membrane performance in the separation of condensable hydrocarbons (iso and n-butane) from hydrogen were investigated. The results showed that the membranes fabricated at 140°C as pretreatment temperature and three polymeric layers by 7, 15, and 15 wt % PDMS concentration, respectively, had a high selectivity (>25 at 2 bar)) in C _4H _(10)/H _2 separation.
机译：开发了一种新型复合膜，该膜使用聚二甲基硅氧烷（PDMS）作为顶部活性层，并使用陶瓷纳米复合材料作为支撑层，用于气态烃的分离。对于混合膜的制造，纳米复合技术应用于制造具有可控微结构的陶瓷载体。另外，使用一种新方法来涂覆均匀且没有穿透的聚合物层。基于分数碰撞频率理论，使用具有最佳重量分数的第二相（SiO _2）的5 wt％α-Al_2O _3-SiO _2双分散悬浮液制备了具有纳米复合材料微结构的陶瓷载体顶层。通过浸涂法将PDMS选择层涂布在多孔陶瓷纳米复合载体的外表面上。在这方面，研究了从氢气分离可冷凝烃（异丁烷和正丁烷）时，预处理温度，PDMS溶液浓度和涂覆的聚合物层数等参数对制备的层形态和杂化膜性能的影响。结果表明，在140℃（预处理温度）和三个聚合物层（分别为7、15、15 wt％PDMS浓度）下制备的膜在C _4H _（10下）具有高选择性（> 25在2 bar下） ）/ H _2分离。

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