A polyimide resin semipermeable membrane has a continuous structure of a homogeneous skin layer part having an average thickness of 5-1000 nm and a porous layer that is made of the same materials and has the same thickness as the skin layer. The porous layer is formed by the void structure having th ...
A reverse osmosis composite membrane that has a high salt rejection, a high water permeability, and a high fouling tolerance, and permits practical desalination at a relatively low pressure is provided by coating the surface of a reverse osmosis membrane of aromatic polyamide with polyvinyl alcohol ...
A composite reverse osmosis membrane comprising a thin membrane and a microporous supporting membrane supporting it, wherein said thin membrane mainly comprises a crosslinked polyamide comprising; (a) an amine component containing at least one member selected from the group consisting of substantial ...
A separation membrane and a method of producing the membrane are provided. The membrane can control its permselectivity and its fouled pores can be easily washed by using the reversible shape change of the membrane. For this purpose, porous shape memory polymers are used for the separation membrane.
A reverse osmosis composite membrane comprises a sponge layer, and a separation layer formed on a surface of the sponge layer, wherein at least one substance selected from the group consisting of an electrically neutral organic substance and an electrically neutral polymer is present in the separati ...
A spiral wound type separation membrane element includes a spiral wound type membrane component formed by superposing separation membranes of membrane materials supported on nonwoven fabric members on both surfaces of a permeated liquid passage forming member and bonding three sides with an adhesive ...
An acid chloride, bicyclo[2,2,2]oct-7ene-(2.alpha.,3.beta.,5.alpha.,6.beta.)tetracarbonyl chloride (C.sub.12 H.sub.8 O.sub.4 Cl.sub.4) represented by the following formula: ##STR1##
In the treatment, a reverse osmosis membrane element having a polyamide skin layer is loaded in a pressure vessel in a membrane separator and contacted with a bromide-containing aqueous solution of free chlorine. The thus treated reverse osmosis membrane element retains for a long time its effect of ...
A homogeneous membrane or an asymmetric membrane which is made of polyimide resin containing fluorine as a main component and has high separation and permeation properties, is used in a method of separating unsaturated hydrocarbon from a mixture of unsaturated and saturated hydrocarbon. The method i ...
The semipermeable membrane of polysulfone resin is formed of a continuous structure of a homogeneous skin layer part having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of the homogeneous skin layer and is thicker than the homogeneous skin layer, ...
