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首页> 外文期刊>Separation and Purification Technology >Isomorphously substituted B-MFI hollow fibre membranes for p-xylene separation from C8 aromatic mixtures
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Isomorphously substituted B-MFI hollow fibre membranes for p-xylene separation from C8 aromatic mixtures

机译：同构取代的B-MFI中空纤维膜，用于从C8芳烃混合物中分离对二甲苯

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摘要

In this study, AI-MFI and B-MFI (Si/B = 100 and Si/B = 50) hollow fibres with nanocomposite architecture have been prepared on α-alumina by pore-plugging hydrothermal synthesis at 443 K for 89 h using a precursor clear solution with molar composition 1 SiO2: 0.45 TPAOH: 27.8 H2O: xH3BO3 (x = 0-0.02). The synthesized materials were characterized by XRD, SEM, ICP-AES and ~(29)Si, ~(27)Al- and ~(11)B-MAS-NMR, revealing the genesis of well-intergrown materials with isomorphously substituted boron in the MFI unit cell. The pure ethylbenzene permeance within these membranes decreased in the order Al-MFI > B-MFI (Si/ B = 50) > B-MFI (Si/B = 100). All the MFI materials were selective to p-xylene in the vapour permeation of ternary p-/m-/o-xyIene mixtures and quaternary p-/m-/o-xylene/ethylbenzene model mixtures in the temperature range 400-650 K and for total feed vapour pressures lower than 4.5 kPa. The p-/m-xylene separation factor increased in the sense Al-MFI < B-MFI (Si/B = 100) ≈ B-MFI (Si/B = 50). The p-/ m-xylene and p-/o-xylene separation factors, as well as p-xylene mixture fluxes, decreased with the ethylbenzene feed concentration, probably due to configurational entropy effects in the mixture adsorption patterns. The membranes showed however slightly preferential p-xylene permeation than ethylbenzene at low total aromatic vapour pressures despite the similar kinetic diameter of both molecules (5.8 vs. 6.0 A), the B-MFI (Si/B = 50) material achieving a p-xylene/ethylbenzene separation factor as high as 5.
机译：在这项研究中，通过在443 K上使用孔塞水热合成89 h在α-氧化铝上制备了具有纳米复合结构的AI-MFI和B-MFI（Si / B = 100和Si / B = 50）中空纤维。摩尔组成为1 SiO2：0.45 TPAOH：27.8 H2O：xH3BO3（x = 0-0.02）的前体透明溶液。用XRD，SEM，ICP-AES和〜（29）Si，〜（27）Al-和〜（11）B-MAS-NMR对合成的材料进行表征，揭示了同构取代硼的良好共生材料的成因。 MFI单位单元。这些膜中的纯乙苯渗透率按Al-MFI> B-MFI（Si / B = 50）> B-MFI（Si / B = 100）的顺序降低。所有MFI材料在温度范围为400-650 K和200-650 K的三元对/间/邻二甲苯混合物和季对/间/邻二甲苯/乙苯模型混合物的蒸汽渗透中对对二甲苯具有选择性。总进料蒸汽压力低于4.5 kPa。对-/间二甲苯分离因子在Al-MFI

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