Abstract: Pulp, containing black liquor, is separated to produce pulp substantially free of black liquor. An organic solvent forms a layer within a vessel and adding a pulp containing black liquor will establish three layers. From the lower layer, pulp substantially free of black liquor is removed. From the upper layer, black liquor substantially free of pulp is removed, and the layer of organic solvent is retained in place within the vessel. The resulting separation, by dissimilar densities of the organic solvent and pulp containing black liquor produces black liquor devoid of additional dilution by water whereby pulp containing black liquor is separated to create pulp substantially free of black liquor and provides black liquor separated from the organic solvent.