Patent ID: 8347525

Claim:
A spray drying system adapted to provide a composition of dry, or essentially solvent free, particles from a solution of an agent, comprising a generally vertical tube reactor arranged for counter-current removal of solvent from a process flow fed with aerosol droplets of solution descending from the top of said reactor with an ascending gas flow, wherein the tube rector comprises: (i) a perforated process tube for transportation of the process flow from the outlet of an aerosol generating device, capable of generating said aerosol droplets of solution, to a dry particle collecting device; (ii) a membrane sleeve essentially surrounding the peripheral area of said process tube, separating the descending process flow from the ascending gas flow while admitting diffusion of vaporized solvent from the process stream to the ascending gas stream; and (iii) a reactor housing sealingly covering said process tube and membrane sleeve being provided with means for introducing and/or removing the process fluids.