An electrostatic spray drying system for drying liquid into powder form comprising: an elongated structural body supported in upright position; an upper closure arrangement at an upper end of the elongated body and a lower closure arrangement at a lower end of said elongated body for forming a drying chamber within said elongated body; an electrostatic spray nozzle assembly supported in said upper closure arrangement; said electrostatic spray nozzle assembly including a nozzle body having a discharge spray tip at a downstream end thereof for directing liquid into said drying chamber; said electrostatic spray nozzle assembly having a liquid inlet for coupling to a supply of liquid to be discharged into the drying chamber and an electrode for coupling to an electrical source for electrically charging liquid passing through said spray nozzle assembly for discharge from said discharge spray tip into said drying chamber 502) as fine liquid particles. said upper closure arrangement having a drying gas inlet for directing drying gas into said drying chamber for drying the discharged fine liquid particles into powder, said lower closure arrangement having a drying gas outlet through which drying gas exiting from said drying chamber is directed; said lower closure arrangement having a powder collection vessel for receiving dried powder from said drying chamber; characterized by: a filter collection sock mounted within said powder collection vessel made of a filter material and having an upwardly opening side communicating with said drying chamber for receiving, capturing and collecting dried powder from said drying chamber prior to direction of the drying gas to and through said drying gas outlet; and said filter collection sock being removably supported within said powder collection vessel for enabling removal and dispensing of dried powder collected in the filter collection sock and replacement within the powder collection vessel for reuse. an elongated structural body supported in upright position; an upper closure arrangement at an upper end of the elongated body and a lower closure arrangement at a lower end of said elongated body for forming a drying chamber within said elongated body; an electrostatic spray nozzle assembly supported in said upper closure arrangement; said electrostatic spray nozzle assembly including a nozzle body having a discharge spray tip at a downstream end thereof for directing liquid into said drying chamber; said electrostatic spray nozzle assembly having a liquid inlet for coupling to a supply of liquid to be discharged into the drying chamber and an electrode for coupling to an electrical source for electrically charging liquid passing through said spray nozzle assembly for discharge from said discharge spray tip into said drying chamber 502) as fine liquid particles. said upper closure arrangement having a drying gas inlet for directing drying gas into said drying chamber for drying the discharged fine liquid particles into powder, said lower closure arrangement having a drying gas outlet through which drying gas exiting from said drying chamber is directed; said lower closure arrangement having a powder collection vessel for receiving dried powder from said drying chamber; characterized by: a filter collection sock mounted within said powder collection vessel made of a filter material and having an upwardly opening side communicating with said drying chamber for receiving, capturing and collecting dried powder from said drying chamber prior to direction of the drying gas to and through said drying gas outlet; and said filter collection sock being removably supported within said powder collection vessel for enabling removal and dispensing of dried powder collected in the filter collection sock and replacement within the powder collection vessel for reuse. a filter collection sock mounted within said powder collection vessel made of a filter material and having an upwardly opening side communicating with said drying chamber for receiving, capturing and collecting dried powder from said drying chamber prior to direction of the drying gas to and through said drying gas outlet; and said filter collection sock being removably supported within said powder collection vessel for enabling removal and dispensing of dried powder collected in the filter collection sock and replacement within the powder collection vessel for reuse.