吸附功能膜的三维通道构建及其脱硫行为

以耐高温基聚合物聚酰亚胺(PI)为基质材料,以Y分子筛为功能颗粒,通过相转化法制备了吸附功能膜,用于燃料油的深度脱硫,采用FT-IR、XPS和电镜分析手段系统研究了该吸附功能膜的形态结构、通道与吸附脱硫性能的关系。结果表明,所制备的吸附功能膜具有发达的孔结构,功能颗粒镶嵌于基膜表面层的三维网络通道中。膜的孔结构随凝固浴介质的不同而有显著区别,以水、乙醇、异丙醇、正丁醇的顺序,从指状孔结构逐渐向海绵状孔结构过渡;挥发时间的增加有利于海绵状孔的形成,海绵状、指状孔通道共存有利于吸附功能的实现。AgY-PI膜的吸附性能高于NaY-PI膜,这与分子筛与硫化物的结合力大小有关;AgY-PI膜可将燃料油硫质量浓度降至0.1mg/L以下,为燃料油脱硫提供了一种新途径。

Construction of Three-Dimensional Channel and Desulfurization Behavior of Absorption Function Membrane

The membrane adsorbents for desulphurization of fuel oil were prepared with polyimide(PI) as matrix material and Y zeolite as adsorptive functional materials. The relationships between membrane morphology, mass transfer channel and membrane adsorption desulfurization behavior of the membrane were investigated by means of FT-IR、XPS and SEM. The detailed characterization results showed that the membranes possessed abundant pores, and the zeolites particles were dispersed in the membrane surface and incorporated with the polymer matrix. The pore structure of the prepared membrane was also related with the medium of coagulation bath used in preparation. With the order of the medium from water, ethanol, em-propanol, n-butanol, the pore structure of the prepared membrane changed gradually from finger-like to sponge-like. The increase of the volatile time during the preparation was favor to the formation of spongy-like pores. Both of finger-like and sponge-like pores were the functional zone of adsorption. The adsorption capacity of AgY-PI for sulphur was higher than that of NaY-PI membrane due to their different binding forces with sulfur compounds. After adsorption by AgY-PI membrane, the sulpher content of fuel oil could be below 0.1 mg/L, meaning that the membrane adsorption is an effective desulfurization technology for fuel oil.