球磨晶种粒径分布对DD3R分子筛膜晶化与气体分离性能影响

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关键词：DD3R分子筛膜；中空纤维；球磨；气体分离； CO2/CH4 中图分类号：TQ028.8 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.00.027

Effect of particle size distribution of ball-milled seeds on the crystallization and separation performance ofDD3R zeolite membrane

LIU Haiquan， DU Peng， ZHANG Yuting， GU Xuehong （State Key Laboratory ofMaterials-Oriented Chemical Enginering，College of Chemical Enginering，Nanjing Tech University，Nanjing 211800，China）

Abstract：To prevent the formation of SGT zeolite，ball-milled Sigma-1 zeolites with a uniform particle size distribution were used to prepare hollow fiber DD3R zeolite membranes for CO2/CH4 separation. Effects of ballmilling parameters and centrifugationon the particle size distribution of Sigma-1 seeds weresystematically investigated. When the ball to powder ratio （BPR）， speed and time were 25， 300rmin-1 and 0.5h ，the fraction of agglomerated flakes，average particle size and span value of ball-milled seed were 7wt% ， 370nm and 1.4， respectively.Theagglomerated flakes caused the growth of the impuritycrystal phase ofSGT，which significantly reduced the gas separation performance of membranes. After centrifugation，the agglomerated flakes were removed and a uniform seed was obtained. This seed had an average particle size of 360nm and a span value of O.8， and was then used to prepare pure-phase DD3R zeolite membrane， which exhibited a CO2 permeance of 1.57×10-7 （204号 mol⋅m-2⋅s-1⋅Pa-1 and a CO2/CH4 selectivity of 398 at 30% and 0.1MPa

Key words： DD3R zeolite membrane; hollow fiber；ball milling; gas separation； CO2/CH4

1前言

沸石分子筛膜凭借其规则的孔道结构、良好的水热稳定性、化学稳定性，在有机溶剂脱水、气体分离、催化等领域展现出广泛的应用前景[1]。（剩余11943字）