solid–liquid extraction Soxhlet extraction A solid-liquid extraction in which the partially soluble components of a solid are transferred to the liquid phase using a Soxhlet extractor. The solid is placed in a filter paper thimble which is then placed into the main chamber of the Soxhlet extractor. The solvent (heated to reflux) travels into the main chamber and the partially soluble components are slowly tranferred to the solvent. CHMO:0001609