Separation of polyaromatic hydrocarbons from model diesel composition via pervaporation using a fabricated aromatic polyimide membrane and process optimization

2018 ◽  
Vol 37 (6) ◽  
pp. 1982-1992 ◽  
Author(s):  
Sayan Roychowdhury ◽  
Debarati Mitra
Keyword(s):  
Process Optimization ◽  
Polyaromatic Hydrocarbons ◽  
Aromatic Polyimide ◽  
Polyimide Membrane ◽  
Model Diesel

Study on molecular weight cut-off performance of asymmetric aromatic polyimide membrane

1997 ◽  
Vol 123 (1) ◽  
pp. 143-147 ◽  
Author(s):  
H. Ohya ◽  
I. Okazaki ◽  
M. Aihara ◽  
S. Tanisho ◽  
Y. Negishi
Keyword(s):  
Molecular Weight ◽  
Aromatic Polyimide ◽  
Polyimide Membrane

scholarly journals The aromatic polyimide membrane for gas separation and its applications.

1988 ◽  
Vol 67 (12) ◽  
pp. 1038-1051 ◽  
Author(s):  
Asumaru NAKAMURA ◽  
Minoru HOTTA ◽  
Kohei NINOMIYA
Keyword(s):  
Gas Separation ◽  
Aromatic Polyimide ◽  
Polyimide Membrane

Separation of alcohol aqueous solution by pervaporation using asymmetric polyimide membrane

1995 ◽  
Vol 7 (3) ◽  
pp. 275-281 ◽  
Author(s):  
H Yanagishita ◽  
D Kitamoto ◽  
T Nakane
Keyword(s):  
Aqueous Solution ◽  
Phase Inversion ◽  
Dimethyl Formamide ◽  
Inversion Process ◽  
Vacuum Oven ◽  
Aromatic Polyimide ◽  
Membrane Performance ◽  
Polyimide Membrane ◽  
Separation Factors ◽  
Phase Inversion Process

Asymmetric polyimide membranes were prepared by the phase inversion process by casting solutions composed of 25 wt% aromatic polyimide (PI-2080), 35 wt% N,N'-dimethyl formamide (DMF) and 40wt% dioxane. The membranes were annealed at 300C for 3 h in a vacuum oven and were measured for various alcohol aqueous solutions in pervaporation. The membrane exhibited separation factors of a(H20/EtOH) = 900 and a(H,0/2-PrOH)= I I000 with a flux of 0.45 kgm 2 h t for a 95 vol.% alcohol aqueous solution at 60C. The membrane showed stable membrane performance for 3 months for a 95 vol.% ethanol aqueous solution at 60"C.

scholarly journals Copolyamide-Imide Membrane with Low CTE and CME for Potential Space Optical Applications

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1001
Author(s):  
Jiajia Yin ◽  
Danbo Mao ◽  
Bin Fan
Keyword(s):  
Imaging System ◽  
Coefficient Of Thermal Expansion ◽  
Structure Design ◽  
Optical Telescope ◽  
Aromatic Polyimide ◽  
System Architectures ◽  
Moisture Expansion ◽  
Polyimide Membrane ◽  
Optical Applications ◽  
Coefficient Of Moisture Expansion

Polyimide diffractive membrane lens can be used in space optical telescope to reduce the size and mass of an imaging system. However, traditional commercial aromatic polyimide membrane is hard to meet the challenging requirements of dimensional stability and optical homogeneity for optical use. Based on molecular structure design and the optimization of fabrication process, the prepared copolyamide-imide membrane achieved the desired performance of membrane as an optical material. It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of −150–100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH). For the optical use, the prepared copolyamide-imide membrane (φ200 mm) achieved good thickness uniformity with wave-front error smaller than λ/30 (λ = 632 nm) in RMS (root mean square). Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. Copolyamide-imide membranes in this research with good comprehensive performance can be used as large aperture membrane optical system architectures.

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