PDMS修饰STT分子筛膜及天然气提氦性能研究
Study on PDMS-modified STT zeolite membranes for helium extraction from natural gas
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- 引用格式:
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熊英杰,代勇,李莹珂,王学瑞,沙漠,杨苗.PDMS修饰STT分子筛膜及天然气提氦性能研究[J].天然气与石油,2025,43(2):12-19.doi:10.3969/j.issn.1006-5539.2025.02.002
XIONG Yingjie, DAI Yong, LI Yingke, WANG Xuerui, SHA Mo, YANG Miao.Study on PDMS-modified STT zeolite membranes for helium extraction from natural gas[J].Natural Gas and Oil,2025,43(2):12-19.doi:10.3969/j.issn.1006-5539.2025.02.002
- DOI:
- 10.3969/j.issn.1006-5539.2025.02.002
- 作者:
- 熊英杰1 代勇2,3 李莹珂1 王学瑞2,3 沙漠4 杨 苗1
XIONG Yingjie1, DAI Yong2,3, LI Yingke1, WANG Xuerui2,3, SHA Mo4, YANG Miao1
- 作者单位:
- 1. 中国石油工程建设有限公司西南分公司, 四川 成都 610041; 2. 南京工业大学化工学院, 江苏 南京 211816; 3. 南京工业大学材料化学工程全国重点实验室, 江苏 南京 211816; 4. 中国石油技术开发有限公司, 北京 100028
1. CPECC Southwest Company, Chengdu, Sichuan, 610041, China; 2. College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, China; 3. State Key Laboratory of MaterialsOriented Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, China; 4. China Petroleum Technology Development Co., Ltd., Beijing, 100028, China
- 关键词:
- STT分子筛膜;天然气提氦;缺陷修饰;气体分离
STT zeolite membranes; Helium extraction; Defect modification; Gas separation
- 摘要:
- 氦气是一种稀缺性重要资源,主要来源依赖于含氦天然气。中国天然气中氦含量极低,存在提取难度大、成本高等问题,膜分离技术可实现氦气的高效提取。STT(Standard Oil Synthetic Zeolite-twenty-three)分子筛膜因独特的孔道结构,在氦气/甲烷分离中表现出良好的分离性能。然而,STT分子筛膜在水热合成或模板剂脱除过程中容易形成晶间缺陷,导致选择性偏低,不能直接用于天然气提氦。为了修饰STT分子筛膜缺陷并用于天然气提氦,研究提出聚二甲基硅氧烷(Polydimethylsiloxane,PDMS)修饰STT分子筛膜晶间缺陷的方法,研究了PDMS含量、固化温度等操作参数对晶间缺陷修复的影响。在最佳条件下,PDMS修饰STT分子筛膜用于模拟贫氦天然气的提氦(氦气含量为0.075%),压力5.2 MPa下氦气/甲烷分离选择性达到166,氦气浓缩倍数为82,氦气回收率达到55%。PDMS修饰STT分子筛膜有效消除了晶间缺陷,提升了氦气/甲烷分离性能,显示了在贫氦天然气提氦中广阔的应用前景。
Helium(He) is a scarce and strategic resource, and its source is mainly dependent on heliumcontaining natural gas. The helium content of natural gas in China is extremely low, making it challenging and costly to extract. Membrane gas separation is an efficient extraction method. STT(Standard Oil Synthetic Zeolite-twenty-three) zeolite membranes perform well in He/CH4 separation due to their unique pore structure. However, intercrystalline defects are easily formed during hydrothermal synthesis and template removal, leading to a low selectivity of STT zeolite membrane at high pressure. Hence, these STT zeolite membranes cannot be directly used for helium extraction from natural gas. In order to mitigate these intercrystalline defects, a method by coating PDMS(polydimethylsiloxane) was proposed. The operating parameters such as PDMS content and curing temperature on the repair of intercrystalline defects were welloptimized to improve the He/CH4 selectivity. The PDMSmodified STT zeolite membranes were used to simulate helium extraction from the heliumdepleted natural gas containing 0.075% He. At the feed pressure of 5.2 MPa, the He/CH4 selectivity reached 166. In this case, the helium was enriched by 82fold and the helium recovery was 55%. The PDMSmodified STT zeolite membranes effectively eliminated the intercrystalline defects and enhanced the He/CH4 high pressure separation performance, showing the application prospects of modified STT zeolite membrane in helium extraction from heliumdepleted natural gas.
