非对称陶瓷分离膜的制备及性能研究

Preparation and Properties of Asymmetric Ceramic Membrane

采用湿化学方法对氧化铝原料进行纳米包裹,以低温固态烧结方式获得高性能的大尺寸非对称陶瓷分离膜,并研究了0.2μm非对称陶瓷分离膜的产品性能。结果表明,该非对称陶瓷分离膜孔径分布集中,基本分布在0.1—0.2μm之间,膜层表面完整无缺陷;样品纯水过滤通量测试表明,当进水口工作压力为0.2MPa,其纯水过滤通量基本稳定在3000L.m-2.h-1以上;从赤霉素发酵液过滤效果来看,该陶瓷分离膜过滤效果良好;样品工作压力及耐化学性检测表明,原始样品的爆破压力可达7.5MPa以上;经过质量分数为20%的硫酸和5%的氢氧化钠在100℃下浸泡36h后,在3.5MPa以上才会破裂,完全可以保证在1.0MPa的工作压力以及pH值为1—14的酸碱环境下安全正常工作,能满足绝大多数高腐蚀性、高温、高压环境下的分离过滤要求。

Employing wet-chemical method, the A1203 powder was packaged with nano-material, through the low-temperature solid-state sintering method, large-size and high-performance asymmetric ceramic membranes were obtained, and the properties of 0.2μm asymmetric ceramic membrane were studied as well. It is demonstrated that the pore size distribution of the ceramic membrane is concentrated in the range of 0.1--0.2μm and its surface is in a perfect condition without any defects. The water flux of the ceramic membranes is stably above 3000L.m-2.h-1. The rejection of gibberellin is excellent. Burst pressure test shows that the membrane would break under the pressure of 7.5MPa. Moreover, the membrane would break under the pressure of 3.5MPa after soaking with the 20%wt sulfuric acid and 5%wt sodium hydroxide at 100℃ for 36h. All of above results indicate that the prepared asymmetric ceramic membrane in the work not only exhibits good performance under the working environment of less than 1.0MPa and pH value of 1--14, but also meets the requirements of most separation process under the extreme environment.