Carbon-based Membranes for Separation Processes by Ahmad Fauzi Ismail, Dipak Rana, Takeshi Matsuura, Henry C. PDF

By Ahmad Fauzi Ismail, Dipak Rana, Takeshi Matsuura, Henry C. Foley

This booklet offers an important review of carbon-related membranes. it is going to hide the improvement of carbon-related membranes and membrane modules from its onset to the newest study on carbon combined matrix membranes. After reviewing growth within the learn of membrane tactics, the ebook discusses destiny examine instructions and potential improvement in that box. a tenet is equipped for readers who want to identify their very own laboratories for carbon membrane study. For this goal, specific details on instruction, characterization, and trying out of varied varieties of carbon membrane is equipped. layout and building of carbon membrane modules also are defined in detail.

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4% N2. CH4 172 (αâ•›=â•›3), C2H6 700 (αâ•›=â•›12), C3H8 1730 (αâ•›=â•›30), n-C4H10 4270 (αâ•›=â•›74). Zhou et€al. [49] introduced sulfonic acid groups in a thermosetting phenolic resin to make a carbon membrane precursor. The sulfonic acid groups evolve upon heating as small molecular gases or fragments such as sulfur dioxide and water, and leave void spaces in the thermoset matrix during the pyrolysis step. The decomposition of sulfonic acid groups occurred before substantial carbonization took place.

1 Precursor Selection The properties of the polymeric precursor are probably one of the most important factors to be considered in order to produce a CMSM of high quality. Because of the variety of polymeric precursors available for carbon membrane preparation, the most suitable characteristics for carbon membrane must be first identified for preparing successful carbon membranes as the pyrolysis of different precursors may result in different types of carbon membrane. From practical experience and knowledge gathered during carbon membrane preparation exercises, two most dominant characteristics have been identified; thermo-resistance and molecular arrangement at molecular levels.

They used the permeation measurements and X-ray powder diffraction to relate the relationship between the gas permselectivity and microstucture of the CMSM. They proposed that the decrease of the interplanar spacing, amorphous portion and pores upon heating might be the origin of the “molecular sieving effect”. Suda and Haraya [11] also clarified the factors that determined the micro-structure and the permeation properties of CMS dense membranes derived from Kapton PI film [11]. They have gained insight into the permeation mechanism through the study of permeability versus kinetic diameter in connection with diffusivity and sorptivity.

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