(under subclass 412) Processes in which separation is effected (a) by means of a permeable membrane through which a solvent is forced under pressure carrying low molecular weight compounds through the membrane or (b) by means of a permeable membrane through which compounds are forced by osmatic pressure.
(1) Note. Ultra filtration membranes typically separate compounds with molecular weight from 1,000 to 1,000,000 dalton (1 to 100 nm) in size.
(2) Note. Particle dimensions of compounds commonly separated by ultra filtration. [figure]
(3) Note. Mesh tree number ultrafiltration. [figure]
SEE OR SEARCH CLASS
210, Liquid Purification,
650, for processes of separation by filtration and subclass 652 for processes of separation by osmosis.
