A membrane separation system is provided comprising at least two membranes in series. A first membrane in the series is oleophobic and comprises: (a) a porous substrate; and (b) an oleophobic coating layer applied to at least one surface of the substrate. A second membrane in the series is hydrophilic. The second membrane may comprise a hydrophilic porous substrate, and/or the second membrane further comprises a hydrophilic coating layer applied to at least one surface of the second membrane substrate. Also provided are methods of separating aqueous emulsions, comprising: (i) contacting an aqueous emulsion with the membrane separation system described above; and (ii) allowing water in the emulsion to permeate through the membrane separation system to yield an aqueous product stream.

A process for the preparation of grape seed extracts from selected unfermented marc, the process comprising steps of grape seed selection, sieving, dehydration, extraction in aqueous solvent, tangential micro-, ultra- and nanofiltration through membranes and spray-drying.

The extracts thus obtained have an analytical profile of active substances useful for preventing the risk of ophthalmological diseases and for controlling the early stages of viral infections of the upper respiratory tract.

Nanofiltration membranes and methods of using and making thereof are disclosed. The nanofiltration membranes contain a silk layer, a porous substrate, and a selective layer. The silk layer is an interlayer sandwiched between the porous substrate and selective layer. The nanofiltration membranes have high performance for filtering water, such as improved water permeance and/or high ion removal rate. For example, the nanofiltration show a water permeance that is at least 2-fold, such as about 5-fold, of the water permeance of a commercially available nanofiltration membrane, such as DuPont FilmTec? NF270 and/or DuPont FilmTec? NF90, and an ion rejection of at least 70% against a target ion, such as a divalent or multivalent ion. The greatly improved water permeance of the nanofiltration membranes can result in up to a magnitude lower energy consumption in water filtration applications.

The present invention relates to a method for recovering a rare metal salt, the method including: an acid treatment step of obtaining a rare metal-containing acidic aqueous solution by bringing a material including a monovalent rare metal and a polyvalent rare metal into contact with an acidic aqueous solution; a separation step of obtaining permeated water including the monovalent rare metal and non-permeated water including the polyvalent rare metal from the rare metal-containing acidic aqueous solution by using a nanofiltration membrane satisfying the condition (1); and a concentration step of obtaining non-permeated water having a higher concentration of the monovalent rare metal and permeated water having a lower concentration of the monovalent rare metal than that of the permeated water in the separation step, by using a reverse osmosis membrane.

The process described herein produces and purifies one or more biomolecules of interest that has practical applications in the field of recombinant protein production in microbial fermentations and mammalian cell culture bioreactors.

The present invention relates to a composite membrane comprising at least one 2D material and an inorganic porous material. The composite membrane described herein may be housed within a separation device which may be used for selective permeation of one or more gaseous compounds.

In the production of a polyphenylsulfone porous hollow fiber membrane by a wet spinning method or a dry-wet spinning method using a spinning dope comprising a water-soluble organic solvent solution of polyphenylsulfone, hydrophilic polyvinylpyrrolidone, and ethylene glycol, wherein N,N-dimethylformamide with a concentration of 70 to 100 wt. %, preferably 85 to 100 wt. %, more preferably 100 wt. %, is used as a core liquid. The resulting porous hollow fiber membrane enables stable production without imposing burdens on the environment and provides a water purification membrane having high water permeability and excellent filtration performance.

A hollow fiber membrane and a method of preparing the same. The hollow fiber membrane has an inner surface and an outer surface, wherein the inner surface has a zebra-stripe pattern in which a dense portion and a porous portion are alternately formed in a longitudinal direction of the hollow fiber membrane.

A zeolite membrane composite includes a porous support and a zeolite membrane formed on at least one surface of the porous support. The zeolite membrane of the zeolite membrane composite is formed of an X-MOR-type zeolite, where X includes at least one type of transition metal ion.

The invention relates to a filtration system for use in a method of determining the presence and/or amount of cells, for example, viable cells, in a liquid sample, and to methods of using and manufacturing such a filtration system. The filtration system includes a cup with an upper portion and a ring portion, where the ring portion is separably coupled to the upper portion.