Transport of 5-Methyl-2-pyrazinecarboxylic Acid through a Layered Bulk Liquid Membrane

Pertraction of 5-methyl-2-pyrazinecarboxylic acid (MPCA) through a layered liquid membrane and parameters influencing the transport with trioctylamine (TOA) carrier have been studied. A simple di usion model correlates concentration dependences in all three phases relatively well. By increasing concentration of the carrier from 0.2 to 0.6 kmol m−3 an increase of the transport rate of MPCA does not occur despite the fact that the value of the distribution coecient of MPCA increases 2.68 times. While H2SO4 and sulfates in the feed do not influence much the transport of MPCA, the addition of sodium chloride slows down the flux of MPCA markedly and increases the co-transport of mineral acids. In pertraction of MPCA from one-molar sulfate solution the ratio of molar fluxes of sulfuric acid and MPCA is equal to one. In pertraction from the feed containing 1 kmol m−3 of NaCl the value of this ratio is equal nearly to four. However, the flux of MPCA is four times lower.