Abstract
The design of a coaxial porous membrane phase separator for use with on-line liquid-liquid extraction in flow-injection work and based on porous membrane tubing is presented. An infrared detector was used. For the extraction of benzyl alcohol from water into carbon tetrachloride, the fraction extracted was 0.48 using an extraction coil of 100 cm × 0.8 mm i.d., a mixing tee and a phase separator constructed of 2.0-μm pore diameter tubing. The dispersion of the separator (mixing tee, extraction coil and phase separator) was 1.16 and represents a small contribution to the total system dispersion. Greater lengths of porous tubing or larger pore diameter tubing produce larger dispersion. The porous membrane tubing is rugged; phase separators constructed from 2.0-μm pore tubing were used for many months and none ruptured.
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