engleski

Influence of ionic liquid content on properties of dense polymer membranes

Pervaporation was used for the removal of butan 1 ol from its 5 wt. % aqueous solution at which concentration Clostridium acetobutylicum fermentation slows down. Two types of membranes were used: a polydimethylsiloxane (PDMS) membrane containing 0, 10, 20 or 30 wt. % of ionic liquid benzyl-3-butylimidazolium tetrafluoroborate ([BBIM][BF4]) and a polyethylene (PE) membrane in which [BBIM][BF4] was sandwiched between two PE films. Differential scanning calorimetry measurements showed that PDMS and [BBIM][BF4] are not compatible and although optically homogeneous, PDMS-[BBIM][BF4] membranes contained PDMS and [BBIM][BF4] phases. Pervaporation selectivity increased and the total flux through the membrane moderately raised with the increased content of [BBIM][BF4] in the PDMS-[BBIM][BF4] membranes. Hence, the immobilization of a proper ionic liquid in the membrane could be the good method for removal the alcohol from fermentation broths by pervaporation. On the contrary, [BBIM][BF4] layer sandwiched between two PE films had no practical effect on the pervaporation properties.

pervaporation; Clostridium acetobutylicum; ionic liquid

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