Preparation and Characterization of Hollow Fiber Carbon Membranes from Cellulose Acetate Precursors

Abstract

Hollow fiber carbon membranes (HFCMs) were prepared from deacetylated cellulose acetate precursors using a multidwell carbonization protocol. FTIR, scanning electron microscopy, and thermogravimetric analysis−mass spectrometry were employed to characterize the HFCMs. Gas permeation tests were conducted with single gases (H2, CO2, N2, and CH4) as well as gas mixtures. The single-gas test results indicated that the molecular sieving mechanism dominated in the carbon membrane separation process. The effects and feed pressure on the carbon membrane performance were also investigated. Moreover, the gas-mixture test results indicated that the permeability and selectivity need to be optimized by adjusting the operating conditions (basically temperature) for the membrane process. The aging test result indicates that the permeability of the carbon membrane will decrease over time when it is exposed to the laboratory air.

Preparation and characterization of polyvinyl acetate/zeolite 4A mixed matrix membrane for gas separation

“…On the contrary, gas molecules with higher activation energy i.e. N 2 can benefit more from the temperature increase leading to decrease of CO 2 /N 2 selectivity [28]. As the selectivity of all the three gas pairs O 2 /N 2 , H 2 /N 2 and CO 2 / N 2 has decreased with increase in temperature for the PVAc-4A MMMs considered here, therefore activation energy may be the best explanation for this case.…”

“…However the high cost of membrane production and handling issues due to its brittle nature are the challenges that should be addressed to fully exploit its potential for gas separation [25,26]. The work of Memfo research group at NTNU-Norway is worth-mentioning in this regard [27,28].…”

Improving the Gas‐Separation Properties of PVAc‐Zeolite 4A Mixed‐Matrix Membranes through Nano‐Sizing and Silanation of the Zeolite

“…The activation energy could be used to investigate the effect of temperature on the degree of permeability increase for different gases and the change in selectivity. The activation energy is higher for gas molecules with larger kinetic diameter, such that N 2 has the highest activation energy and He has the smallest activation energy among the gases investigated in this work. From the Arrhenius‐type equation, higher activation energy results in higher permeation change with temperature .…”

Exploiting pyrolysis protocols on BTDA‐TDI/MDI (P84) polyimide/nanocrystalline cellulose carbon membrane for gas separations

“…Xe et al . has analyzed the structure of pyrolyzed cellulose and showed that the thickness of the cellulose‐based carbon membrane was reduced and shrinks from 50 to 30 μm . Conversely, Kiyono et al .…”