Synthesis of high-crystallinity MIL-125 with outstanding xylene isomer separation performance

2021 ◽  
Vol 42 (12) ◽  
pp. 2313-2321
Author(s):  
Liping Yang ◽  
Jiacheng Xing ◽  
Danhua Yuan ◽  
Lin Li ◽  
Yunpeng Xu ◽  
...  
Keyword(s):  
Separation Performance ◽  
Isomer Separation ◽  
High Crystallinity ◽  
Xylene Isomer

scholarly journals Formation Process of Columnar Grown (101)-Oriented Silicalite-1 Membrane and Its Separation Property for Xylene Isomer

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 949
Author(s):  
Motomu Sakai ◽  
Takuya Kaneko ◽  
Yukichi Sasaki ◽  
Miyuki Sekigawa ◽  
Masahiko Matsukata
Keyword(s):  
Secondary Growth ◽  
Microscopic Analysis ◽  
Separation Performance ◽  
Membrane Thickness ◽  
Alumina Support ◽  
Separation Factors ◽  
Growth Method ◽  
Thin Part ◽  
Xylene Separation ◽  
Xylene Isomer

Silicalite-1 membrane was prepared on an outer surface of a tubular α-alumina support by a secondary growth method. Changes of defect amount and crystallinity during secondary growth were carefully observed. The defect-less well-crystallized silicalite-1 membrane was obtained after 7-days crystallization at 373 K. The silicalite-1 membrane became (h0l)-orientation with increasing membrane thickness, possibly because the orientation was attributable to “evolutionally selection”. The (h0l)-oriented silicalite-1 membrane showed high p-xylene separation performance for a xylene isomer mixture (o-/m-/p-xylene = 0.4/0.4/0.4 kPa). The p-xylene permeance through the membrane was 6.52 × 10−8 mol m−2 s−1 Pa−1 with separation factors αp/o, αp/m of more than 100 at 373 K. As a result of microscopic analysis, it was suggested that a very thin part in the vicinity of surface played as effective separation layer and could contribute to high permeation performance.

scholarly journals Sonochemical Synthesis of UiO-66 for CO2Adsorption and Xylene Isomer Separation

2013 ◽  
Vol 51 (4) ◽  
pp. 470-475 ◽  
Author(s):  
Hee-Young Kim ◽  
Se-Na Kim ◽  
Jun Kim ◽  
Wha-Seung Ahn
Keyword(s):  
Isomer Separation ◽  
Sonochemical Synthesis ◽  
Xylene Isomer

Nanocomposite MFI–ceramic hollow fibre membranes via pore-plugging synthesis: Prospects for xylene isomer separation

2009 ◽  
Vol 337 (1-2) ◽  
pp. 106-112 ◽  
Author(s):  
M.O. Daramola ◽  
A.J. Burger ◽  
M. Pera-Titus ◽  
A. Giroir-Fendler ◽  
S. Miachon ◽  
...  
Keyword(s):  
Hollow Fibre ◽  
Isomer Separation ◽  
Xylene Isomer ◽  
Pore Plugging

scholarly journals Uniform hierarchical MFI nanosheets prepared via anisotropic etching for solution-based sub–100-nm-thick oriented MFI layer fabrication

2020 ◽  
Vol 6 (7) ◽  
pp. eaay5993 ◽  
Author(s):  
Yi Liu ◽  
Weili Qiang ◽  
Taotao Ji ◽  
Mu Zhang ◽  
Mingrun Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Single Mode ◽  
Anisotropic Etching ◽  
Separation Performance ◽  
Isomer Separation ◽  
Assembly Method ◽  
Tetrapropylammonium Hydroxide ◽  
Wide Range ◽  
Plane Solution ◽  
Air Liquid Interface

Zeolite nanosheets have shown unprecedented opportunities for a wide range of applications, yet developing facile methods for fabrication of uniform zeolite nanosheets remains a great challenge. Here, a facile approach involving anisotropic etching with an aqueous solution of tetrapropylammonium hydroxide (TPAOH) was developed for preparing uniform high–aspect ratio hierarchical MFI nanosheets. In addition, the mechanism associated with the formation of MFI nanosheets was proposed. In the next step, a dynamic air-liquid interface–assisted self-assembly method and single-mode microwave heating were used for b-oriented MFI nanosheets monolayer deposition and controlled in-plane solution-based epitaxial growth, respectively, ensuring the formation of well-intergrown b-oriented MFI layers with sub–100-nm thickness. Moreover, our study indicated that b-oriented ultrathin MFI layers could be fabricated on diverse substrates demonstrating excellent anticorrosion capacity, ionic sieving properties, and n-/i-butane isomer separation performance.

Field testing CFD-based predictions of storage chamber gross solids separation efficiency

1999 ◽  
Vol 39 (9) ◽  
pp. 161-168 ◽  
Author(s):  
Virginia R. Stovin ◽  
Adrian J. Saul ◽  
Andrew Drinkwater ◽  
Ian Clifforde
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Settling Velocity ◽  
Separation Efficiency ◽  
Flow Patterns ◽  
Total Efficiency ◽  
Separation Performance ◽  
Storage Chamber ◽  
Solids Separation ◽  
Simulated Flow

The use of computational fluid dynamics-based techniques for predicting the gross solids and finely suspended solids separation performance of structures within urban drainage systems is becoming well established. This paper compares the result of simulated flow patterns and gross solids separation predictions with field measurements made in a full size storage chamber. The gross solids retention efficiency was measured for six different storage chambers in the field and simulations of these chambers were undertaken using the Fluent computational fluid dynamics software. Differences between the observed and simulated flow patterns are discussed. The simulated flow fields were used to estimate chamber efficiency using particle tracking. Efficiency results are presented as efficiency cusps, with efficiency plotted as a function of settling velocity. The cusp represents a range of efficiency values, and approaches to the estimation of an overall efficiency value from these cusps are briefly discussed. Estimates of total efficiency based on the observed settling velocity distribution differed from the measured values by an average of ±17%. However, estimates of steady flow efficiency were consistently higher than the observed values. The simulated efficiencies agreed with the field observations in identifying the most efficient configuration.

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