Figure 319

Examples of commonly used dialyzers. "Efficiency" refers to the capacity to remove urea; "flux" refers to the capacity to remove water, and indirectly, the capacity to remove molecules of middle molecular weight. Cellulosic membranes can be either low flux or high flux. Similarly, synthetic membranes can be either low flux or high flux. High-efficiency membranes usually have large surface areas.

Ko—mass transfer coefficient; A—surface area.

Adapted from Leypoldt and coworkers [4] and Van Stone [22].

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