High-reproducibility silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis, and the relative standard deviation (R.S.D.) of average separation factor for eight membranes was only 7....High-reproducibility silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis, and the relative standard deviation (R.S.D.) of average separation factor for eight membranes was only 7.5%. By using an effective method called "solution-filling (SF)", the average flux of membranes prepared with SF method was improved by about 49% compared to membranes prepared without SF method, and the highest flux of membrane prepared with SF method towards ethanol/H2O mixture at 80℃ was 1.49 kg/(m2·h). Pervaporation experiments showed that the fluxes of silicalite-1 membranes at 60℃ were 2.63, 0.87, 0.24, and 0.20 kg/(m2·h) towards methanol/H2O, ethanol/H2O, 2-propanol/H2O, and 1-propanol/H2O mixtures, respectively, and the corresponding separation factors were 22, 69, 81, and159, respectively.展开更多
High-performance silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis. By using the “solution-filling (SF)” method, the average flux of membranes with the SF method was improved ...High-performance silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis. By using the “solution-filling (SF)” method, the average flux of membranes with the SF method was improved by about 25% compared to that of the membranes without using the SF method; the flux and the separation factor of the membranes prepared with the SF method for an ethanol/water mixture at 60°C were 0.99 kg/(m2·h) and 73, respectively. It was found that the membranes synthesized on silica tubes exhibited high thermal stability and high reproducibility, and the relatively standard deviations (R.S.D.) of the average flux and separation factor were only 9.6% and 5.6%, respectively, which suggests that the silica support is more suitable than other kinds of supports for preparing high-performance silicalite-1 membranes.展开更多
基金the National Advanced Materials Committee of China (Grant No. 2003AA328010)the Ministry of Science and Technology of China (Grant No. G2003CB615802)
文摘High-reproducibility silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis, and the relative standard deviation (R.S.D.) of average separation factor for eight membranes was only 7.5%. By using an effective method called "solution-filling (SF)", the average flux of membranes prepared with SF method was improved by about 49% compared to membranes prepared without SF method, and the highest flux of membrane prepared with SF method towards ethanol/H2O mixture at 80℃ was 1.49 kg/(m2·h). Pervaporation experiments showed that the fluxes of silicalite-1 membranes at 60℃ were 2.63, 0.87, 0.24, and 0.20 kg/(m2·h) towards methanol/H2O, ethanol/H2O, 2-propanol/H2O, and 1-propanol/H2O mixtures, respectively, and the corresponding separation factors were 22, 69, 81, and159, respectively.
基金Supported by the National Advanced Materials Committee of China (Grant No. 2003AA328010)the Ministry of Science and Technology of China (Grant No. G2003CB615802)
文摘High-performance silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis. By using the “solution-filling (SF)” method, the average flux of membranes with the SF method was improved by about 25% compared to that of the membranes without using the SF method; the flux and the separation factor of the membranes prepared with the SF method for an ethanol/water mixture at 60°C were 0.99 kg/(m2·h) and 73, respectively. It was found that the membranes synthesized on silica tubes exhibited high thermal stability and high reproducibility, and the relatively standard deviations (R.S.D.) of the average flux and separation factor were only 9.6% and 5.6%, respectively, which suggests that the silica support is more suitable than other kinds of supports for preparing high-performance silicalite-1 membranes.
