MEMBRANE FILTER AND PLASMOPHERESIS SYSTEM (VERSIONS) Russian patent published in 2000 - IPC

FIELD: membrane-type filtering equipment. SUBSTANCE: apparatus for membrane separation of solutions has immovable hollow cylindrical casing with bottom at one side and is provided with liquid supplying and discharge branch pipes and movable cylinder with semipermeable membrane on cylindrical surface and filtrate discharge union. Movable cylinder is mounted inside cylindrical casing with space between their cylindrical surfaces. Movable cylinder is formed as filter-piston having length smaller than that of cylindrical casing and is provided with pulling member reciprocating within casing. Liquid supplying union of casing has valve positioned at side adjacent to bottom and adapted for admitting liquid into casing. Liquid discharge union of casing has valve positioned at side opposed to bottom and adapted for discharging liquid outside casing. Filtrate discharge union has valve for discharging liquid outside casing. EFFECT: increased efficiency by providing adequate filtering mode. 17 cl, 22 dwg