A dual phase re-circulating extraction apparatus comprises at least one extraction vessel, at least one separation chamber, and a circulation conduit configured to direct a process fluid into the extraction vessel, where it may come into contact with a source material to form a mixture, and is then passed to the separation chamber, where the process fluid separates from the extracted material, and the process fluid is recirculated back to the extraction vessel. The apparatus includes a gas pump, at least one heat exchanger, and a liquid pump, each connected to the conduit, to efficiently convert a relatively low pressure gas after separation to a relatively high pressure liquid or supercritical fluid for extraction. The apparatus can be configured to enable a batch mode process allowing continuous flow to the separators while the extractors are cycled online and offline in a sequence to enable servicing and reloading.