Pd/陶瓷复合膜分离器中H_2/N_2混合气的分离过程

H_2/N_2 gaseous mixture separation in dense palladium/ceramiccomposite membrane

采用光催化沉积法结合化学镀制备出有效膜长为33 cm、膜厚约10μm的致密Pd膜.单气体测试表明,该膜有良好的H2/N2选择性,H2渗透系数在350、400、450及500℃时分别为0.7×103、1.1×103、1.4×103及1.9×103L/(m2.min.MPa0.5).通过H2/N2混合气分离的研究,考察了流体传输对Pd膜分离性能的影响,结果表明H2渗透总流量随着原料气总流量、温度及膜两侧的总压差的增加而增大.采用活塞流模型计算的结果与实验结果吻合较好.

A tubular palladium membrane with a length of 33 cm and a thickness of about 10μm was fabricated by an improved photoeatalytic deposition and electroless plating. Single gas permeation experiments showed that the membrane was defect free, the hydrogen permeability were 0. 7 × 10^3, 1.1× 10^3 , 1.4× 10^3 and 1.9 × 10^3 L/（m^2·min. MPa^0.5） at 350, 400, 450 and 500 ℃, respectively. The effect of fluid transport on separation performance of the palladium membrane was investigated by separating H2/N2 mixing gas. Experimental results showed that the hydrogen flow rate increased with increaseing the feed flow rate, the trans-membrane pressure difference and the temperature. A plug flow model was used to describe the mixture gas permeation experiments. The experimental data are in good agreement with calculated data.