Patent ID: 7794593

Claim:
A liquid-liquid extraction system comprising: a feed solution vessel containing a volume of a feed solution, the feed solution comprising a first liquid having a dissolved solute; a solvent vessel containing a volume of a solvent; a liquid-liquid extraction element comprising: a plurality of first layer pairs in fluid communication with the feed solution vessel, each first layer pair comprising: a first polymeric microporous membrane; and a first flow channel layer oriented in a first flow direction having a first fluid inlet and a first fluid outlet disposed on first opposing sides of the extraction element; a plurality of second layer pairs in fluid communication with the solvent vessel, with at least one second layer pair being disposed between two first layer pairs and at least one first layer pair being disposed between two second layer pairs so as to form a stack of layers, each second layer pair comprising: a second polymeric microporous membrane; and a second flow channel layer oriented in a second flow direction different than the first flow direction and having a second fluid inlet and a second fluid outlet disposed on second opposing sides of the extraction element; a first entrance manifold in fluid communication with the first fluid inlet of each first layer pair and through which the feed solution enters all of the first layer pairs; a first exit manifold in fluid communication with the first fluid outlet of each first layer pair and through which at least the first liquid exits from all of the first layer pairs; a second entrance manifold in fluid communication with the second fluid inlet of each second layer pair and through which the solvent enters all of the second layer pairs; and a second exit manifold in fluid communication with the second fluid outlet of each second layer pair and through which at least the solvent exits from all of the second layer pairs, wherein at least one microporous membrane is disposed between the first flow channel layer and the second flow channel layer of each adjacent first layer pair and second layer pair, and the solute from the feed solution can transfer into the solvent across at least the first and second microporous membranes, and further comprising an outer housing, with the outer housing comprising the first entrance manifold, the first exit manifold, the second entrance manifold and the second exit manifold, wherein the first entrance manifold has one first liquid inlet, the first exit manifold has one first liquid outlet, the second entrance manifold has one second liquid inlet, the second exit manifold has one second liquid outlet, and the outer housing has a removable portion to allow the liquid-liquid extraction element to be removed from the outer housing; and further comprising a frame disposed about the stack of layers, with the frame being configured to be removably placed within the outer housing.