Abstract
Visual observations and heat-transfer data on the promotion of dropwise condensation by montan wax and its fractions, together with analytical data, led to the following conclusions: (1) Promotion is primarily due to normal fatty acids C22–C32 occurring uncombined in the wax, C26, C28 and C30 being predominant. The longer the hydrocarbon chain, the less easily is the acid desorbed. Hydrocarbons and esters may participate in promotion. (2) Promotion by adsorption from solution is very rapid (< 1 min.). Promotion by injection depends on distribution by the steam, and probably requires melting of the wax. (3) Wax fatty acids clean copper condenser tubes by corrosion; the resultant cupric soap is probably inactive in promotion. (4) Degradation experiments show that chemical changes and foaming are unlikely to prevent the use of montan wax in boiler systems involving temperatures up to 300°.
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