Abstract: An apparatus for a supercritical fluid-solid bed process such as for decaffeinating green coffee beans including an elongated cylindrical vessel having a top and bottom. The solids accumulate to form a fluid-solids bed on the bottom of the vessel which includes a central bottom opening, a valve for periodically allowing flow of the solids through the bottom opening and a frustoconical bottom wall. A flow promoting insert having a lower conical wall is provided circumjacent to but spaced from the frustoconical bottom wall. The lower conical wall is provided with a rougher surface than the adjacent frustoconical bottom wall to promote uniform flow of solids. The fluid initially flows through the solids counter-current to the solid flow and is introduced to the vessell through means located above the flow promoting insert.

Abstract: Method and apparatus for contacting particulate solid matter with a fluid in a pressure vessel through which the fluid continuously moves at high, supercritical, pressure while the particulate solid matter is periodically moved via isolatable pressurizable vessels which are periodically pressurized and de-pressurized to and from the supercritical pressure to facilitate periodic movement of the particulate solids between the pressure vessel and the isolatable pressurizable vessels. A supply of the fluid is maintained at an intermediate pressure at which the fluid exists in both the liquid and gaseous states. The pressurizable vessels are raised to supercritical pressure by first using intermediate pressure fluid in the gaseous state and then in the liquid state, followed by introducing fluid at the supercritical pressure. The vessels are de-pressurized by first venting and then pumping to the intermediate pressure fluid supply.