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Attrition polymerization

Since cross-linked polymers caruiot be re-formed or re-shaped it is necessary to synthesize them in the final physical form appropriate for each particular application. Particles in the size range 50-1000 pm are suitable for laboratory scale chemistry, while larger particles have advantages in large scale continuous processes. Irregularly shaped particles are susceptible to mechanical attrition and breakdown to fines , whereas the process of suspension polymerization [13] yields uniform spherical cross-linked polymer particles often referred to as beads, pearls or resins. These are much more mechanically robust and are widely exploited on both a small and large scale e. g. as the basis of ion exchange resins [14]. [Pg.2]

Solid-liquid mixing is used extensively throughout the chemical process industries. Examples include the suspension of solid catalysts in a reactor, the dissolution of solids to form a solution, the suspension of solids in crystallization, suspension polymerization, and fermentation. Crystallizers are usually designed to maximize flow, hence solids suspension, and to minimize shear to avoid crystal attrition. A common application is to provide solids-liquid mixing to feed a solids separator such as a centrifuge. Here the task is to provide a uniform solids feed as levels recede in the feed vessel. [Pg.653]


See other pages where Attrition polymerization is mentioned: [Pg.1553]    [Pg.64]    [Pg.410]    [Pg.495]    [Pg.1375]    [Pg.84]    [Pg.1859]    [Pg.372]    [Pg.7]    [Pg.6]    [Pg.1123]    [Pg.103]    [Pg.15]    [Pg.1851]    [Pg.468]    [Pg.43]    [Pg.68]    [Pg.249]    [Pg.606]    [Pg.758]    [Pg.858]    [Pg.867]    [Pg.8031]    [Pg.653]    [Pg.208]    [Pg.2227]    [Pg.719]    [Pg.59]    [Pg.203]    [Pg.3]    [Pg.796]    [Pg.68]    [Pg.449]   
See also in sourсe #XX -- [ Pg.727 , Pg.728 , Pg.729 , Pg.730 , Pg.731 , Pg.732 , Pg.733 ]




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Attrition

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