Alkene-alkane mixtures, facilitated membranes

Alkene-alkane mixtures, facilitated transport in perfluorosulfonic acid membranes, 286-300 Amide compounds for highly selective transport of heavy metal ions amino acid derivatives, 175-179 A, Ar-bis(8-quinolylcarbamoyl) derivatives, 169-170,172 structure, 167... 

Van Zyl AJ and Kerres JA. Development of new ionomer blend membranes, their characterization and their application in the perstractive separation of alkene-alkane mixtures. II. Electrical and facilitated transport properties. J Appl Pol Sci 1999 74 422-427. 

Successful separation of alkanes and alkenes has been documented when microporous membranes have been used [79,138]. The physiochemical properties, size, and shape of the molecules will play an important role for the separation, hence critical temperatures and gas molecule configurations should be carefully evaluated for the gases in mixture. On the basis of gas properties and process conditions, the separation may be performed according to selective surface flow or molecular sieving (refer to Section 4.2 on transport). The transport may also be enhanced by having a Ag compound in the membrane. The Ag ion will form a reversible complex with the alkene, and facilitated transport results. Selectivities in the range of 200-300 have been reported for separation of ethene-ethane and propene-propane [138]. Successful separation of alkanes and alkenes will be important for the petrochemical industry. Today the surplus hydrocarbons in the purge gas are usually flared. Membranes which should be suitable for this application are the carbon molecular sieves (see Section 4.3.2) and nanostructured materials (Section 4.3.3). 

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See also in sourсe #XX -- [ , , , , , , , , , , , , , ]

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