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Dispersants
and Detergents Table of Contents Physical & Chemical Properties These additives keep sludge, fine solid, and semi-solid contaminants dispersed in the oil rather than settling out as deposits. The compounds used are succinimides, neutral calcium and barium sulfonates, phenates, polymeric detergents and amine compounds. Detergent dispersants are also basic calcium sulfonates/phenates which neutralize sludge precursors. Ash content is the percent by weight of noncombustible residue of an oil. The metallic detergents and dispersants are the primary contributors to ash and may cause unwanted inorganic residue to form. The efficiency of some machines operating at high temperatures is reduced by a build-up of these undesirable deposits. For example, many compressor oils require very low ash, such as a trace. Ash content using ASTM D 874 Sulfated Residue is the most commonly used technique. This method consists of slowly burning the oil in a crucible. The carbonaceous residue after burning is wetted with sulfuric acid and reheated. Once the sulfuric acid is completely volatilized more sulfuric acid is introduced and the crucible is heated in a muffle furnace at 875 degree C until a constant weight of inorganic residue is obtained. This residue is considered the sulfated ash in percent by weight. For more information call 1-888-HERGUTH (437-4884) |
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