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Heat and Mass Transfer Studies: Sulfur Diffusion in Polyurethane, Polyphenylquinoxaline as a Heat Exchanger Coating and Polypropylene Membrane Contactor for Deaeration of Cyanide Solution
Chemical and Materials Engineering
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This research studied the heat and mass transfer characteristics of several polymers as applied to different applications. Polyurethane was investigated to determine the mass transport rate of sulfur compounds. Polyurethane is commonly used as a potting material for sensitive electronics. Sulfur will readily degrade these components; a projected lifetime can be highly useful to avoid catastrophic failure. Pure sulfur gas exhibited a diffusivity of 4.01x10-6 cm2sec-1. A polyphenylquinoxaline coating was studied for viability as a high temperature heat exchanger coating. The coating had a thermal conductivity of 0.1742 W(m2K)-1 Polypropylene membrane contactors are an efficient method to remove dissolved gases from liquids. The membrane contactor was used to determine suitability in the removal of oxygen from a cyanide solution. Flux of dissolved oxygen across the semi-permeable membrane was observed to be 0.0588gO2(m2min)-1.