and rotor 30 the configuration of the rotors allows for the introduction of the fluid into half of the center body sections 50 while the other fluid i e stream 1 or stream 2 is introduced into the other half of the center body sections 50 the center body section 26 could be partitioned into many sections depending on the application each section could contain heat storage or molecule storage materials it could also contain a solid catalyst for chemical reactions the center body could also use monolith honeycomb material and the paltition walls are not needed in such a case an important aspect of the present invention is that it allows for regenerative methods such as rotary air dehumidifiers or regenerative heat exchangers to be utilized wherein the center body sections containing the heat exchange material or molecular storage material do not need to be rotated often times the center body sections of such apparatuses can be very heavy and difficult to rotate the present invention allows for simple rotation of the flow of the fluid entering the apparatus without having to move the actual source of the fluid in chromatography the simulated moving bed smb technique is a variant of high performance liquid chromatography it is used to separate particles and or chemical compounds that would be difficult or impossible.