Fabrication of high-selective hollow fiber DD3R zeolite membrane modules for high-pressure CO2/CH4 separation
Fabrication of high-selective hollow fiber DD3R zeolite membrane modules for high-pressure CO2/CH4 separation
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DOI：
10.1016/j.memsci.2023.121703
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发表时间：
2023-04
影响因子：
9.5
通讯作者：
Peng Du;Xiuyuan Liang;Lekai You;Xuerui Wang;J. Zhang;Xuan Ying;Zhou Hong;Yuting Zhang;
中科院分区：
文献类型：
--
作者：
Peng Du;Xiuyuan Liang;Lekai You;Xuerui Wang;J. Zhang;Xuan Ying;Zhou Hong;Yuting Zhang;
全硅十烷基硅3r （DD3R）沸石膜具有0.36 nm × 0.44 nm的小孔径，在天然气中具有良好的脱除co2效果。本文采用系综合成策略成功制备了膜长40 cm、有效膜面积811 cm2的中空纤维DD3R沸石膜组件。在封釉上生长的膜段厚度在4 ~ 6 μm之间。采用聚四氟乙烯螺旋柱辅助膜单元臭氧检测时间缩短了一半。所得膜组件在3.1 MPa的高进料压力下具有良好的CO2/ ch4分离选择性（105）和25.7%的级切率。研究了进料压力、进料气流量和渗透压力对膜组件分离性能和浓度极化的影响。当进料气流量为2 L min - 1时，在进料压力和渗透压力分别为3.1 MPa和2 kPa时，co2的保留浓度降至9.45%，ch4的损失控制在4.87%。在较高的进料压力或较低的进料气流量下，浓度极化效应更为严重。
All-silica Decadodecasil 3 R (DD3R) zeolite membranes, possessing small pore size of 0.36 nm × 0.44 nm, have been attractive in CO2removal from natural gas. In this work, hollow fiber DD3R zeolite membrane modules with membrane length of 40 cm and effective membrane area of 811 cm2for each were successfully fabricated by ensemble synthesis strategy. Different membrane segments including that was grown on sealing glaze have similar thickness in the range of 4–6 μm. The ozone detemplation time of membrane unit was reduced by a half with the assistance of Teflon spiral column. The resulting membrane module exhibited a good CO2/CH4separation selectivity (105) as well as a stage-cut of 25.7% at high feed pressure of 3.1 MPa. Effects of feed pressure, feed gas flow rate and permeate pressure on separation performance of the membrane module and concentration polarization were investigated extensively. When the feed gas flow rate was 2 L min−1, the retentate CO2concentration was lowered to 9.45% and the CH4loss was limited to 4.87% at the feed and permeate pressures of 3.1 MPa and 2 kPa. The concentration polarization effect became more serious at higher feed pressure or lower feed gas flow rate.