Magnesium Overbase sulfonates

Magnesium overbase sulfonates are used primarily as a motor oil additive where they act to neutralize acidic by-products formed during the combustion process. This helps to reduce corrosion of the internal surfaces of engine components and also reduce the formation of sludge, which are also highly acidic (Spearot, 1974). 

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Benzene is alkylated with C g and C20+ olefins and subsequently sulfonated and neutralized with a dibasic salt such as calcium, magnesium, or barium. These so-called overbased sulfonates are used ia crankcase additive packages. 

These sodium sulfonates or so-called natural sulfonates are transformed into simple or overbase calcium or magnesium sulfonates (Satriana, 1982). 

Detergents are metal salts of organic acids used primarily in crankcase lubricants. Alkylbenzenesulfonic acids, alkylphenols, sulfur- and methjiene-coupled alkyl phenols, carboxyUc acids, and alkylphosphonic acids are commonly used as their calcium, sodium, and magnesium salts. Calcium sulfonates, overbased with excess calcium hydroxide or calcium carbonate to neutralize acidic combustion and oxidation products, constitute 65% of the total detergent market. These are followed by calcium phenates at 31% (22). 

Overbase magnesium sulfonates are a transparent colloidal dispersion (0.1 xm or smaller) of magnesium carbonate in oil containing protective colloids, which are usually magnesium derivatives of petroleum sulfonic acids or alkyl benzene sulfonic acids. 

Chem. Descrip. Overbased magnesium sulfonate Chem. Analysis Magnesium 9.3% magnesium sulfonate 28%... 

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