Abstract
Poly (4-methyl-2-pentyne) (PMPentyne) and poly (4-methyl-1-pentene) (PMPentene) as membrane gas-separating media were studied with a combination of experimental and theoretical approaches. Experimental approaches included the permeability measurements for C1–C4 alkanes in linear heating mode (for PMPentyne) and under isothermal conditions (for PMPentene), and diffusivity evaluation by a differential method for PMPentene. Theoretical approaches included the ‘hard-spheres’ theory for calculation of gas solubility in PMPentyne and gas transport theory for two-phase systems for the estimation of the amorphous and crystalline phases contribution in PMPentene. Correlation analysis was used for any type of gas transfer parameter calculation where experimental data were lacking. These combinations of methods allowed obtaining the whole set of parameters for any gas–polymer pairing and explained the butane-selective properties revealed in PMPentyne (C1 < C2 < C3 < C4) and methane-selective properties of PMPentene (C1 > C2 > C3 > C4).
Highlights
(4-methyl-2-pentyne) and poly (4-methyl-1-pentene) are prospective membrane materials for the separation of lower-hydrocarbon-containing gaseous mixtures
It should be noted that previous production of PMPentene hollow fibers with homogenous walls was performed in Russia at NPO ‘Khimvolokno’ [7]
The combination of theoretical approaches and experimental evaluation of the selective permeance parameters of C1 –C4 alkanes in PMPentene and PMPentyne as polymeric media is presented in this work for the first time
Summary
(4-methyl-2-pentyne) and poly (4-methyl-1-pentene) are prospective membrane materials for the separation of lower-hydrocarbon-containing gaseous mixtures. Both these polymers are usually abbreviated to PMP in the literature. The crystalline phase of PMPentene is permeable to gases, and it has practically the same physical density as the amorphous phase [2,3,4]. It occupies a special place among commercially available polymers [2,5]. Note that PMPentene is one of the most permeable commercially
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