Industrial Membrane Separation Technology by K. Scott, R. Hughes

By K. Scott, R. Hughes

Membrane technology and know-how is an increasing box and has develop into a well known a part of many actions in the technique industries. it's quite effortless to spot the luck tales of membranes similar to desali­ state and microfiltration and to consult others as constructing components. This, although, doesn't do justice to the huge box of separations during which membranes are used. No different 'single' method deals an identical strength and flexibility as that of membranes. The be aware separation classically evokes a version of removal one part or species from a moment part, for instance a mass move procedure akin to distillation. within the box of artificial membranes, the terminology 'separation' is utilized in a much wider context. a number of separations of the chemical/mass move style have built round the use of membranes together with distillation, extraction, absorption, adsorption and stripping, in addition to separations of the actual sort corresponding to filtration. man made membranes are a vital part of units for research, strength iteration and reactors (cells) within the electrochemical industry.

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Ion-exchange groups are primarily sulphonic acid or carboxylic acid groups for cation-exchange membranes and quaternary ammonium salts for anion-exchange membranes. When placed in an electrolyte solution and an electrical current is passed through them by the motion of the mobile ions, the ions with the same charge as the mobile ions are free to flow from one face of the membrane to the other under the influence of a potential gradient. Thus cationic polymeric membranes are permeable to cations and almost impermeable to anions and vice versa for anionic membranes.

However, this can be overcome by adding a recycle stream from the final retentate back into the feed pump. This allows greater flexibility in selection of the number of modules per array, but because the concentration of the feed entering the plant will now be higher, the concentration in the permeate will also increase. The higher feed concentration will also yield a lower overall flux, thus increasing the total membrane area required and raising the total power consumption. Although this layout of plant can be used with virtually any of the module types currently available, it is most commonly used with spiral elements, particularly for water desalination.

M diameter and they are made up into modules of 1 m 2 and 2 m 2 membrane area. 14 Membranes in these configurations are available for reverse osmosis, ultrafiltration and microfiltration applications. Examples of use include water desalination (reverse osmosis), water clarification (ultrafiltration, microfiltration), fruit clarification (ultrafiltration), wine and cider clarification (microfiltration), electrophoretic paint recovery (ultrafiltration) and oily waste water treatment. 4 Flat sheet Flat sheet membranes are available for all of the four pressure driven processes.

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