Abstract
A new kind of compressed air dryer, based on use of semipermeable membranes, is being commercialized by Permea Inc., a subsidiary of Monsanto. The combination of a proprietary spinning technique and a unique postspinning treatment of the membrane has yielded a material that permits high water vapor fluxes with small unit size. The dryers, called Prism Cactus, are the result of work by Permea development engineers Arthur W. Rice and M. Keith Murphy. They are an extension of the gas separation technology developed previously for the company's Prism and Prism Alpha membrane systems. A major difference is that the Prism Cactus dryers do not use a coated membrane—they use an uncoated membrane in which the upstream surface has been given the desired characteristics by thermal and/or solvent postspinning treatment. Gas passes through a membrane by a combination of diffusion through pores linking the surfaces of the membrane and permeation through the material of the ...
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