Importance

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Abstract

Instead of total base number of about 30 for an alkaline earth metal sulfonate prepared by reacting up to 200 molar excess of alkaline earth metal compound at a temperature above 104.degree. C. with an alkylbenzene sulfonic acid in the presence of from 0.5 to 10 weight parts of water per 1.0 weight part of alkaline earth metal compound under a pressure of from 2 to 10 atmospheres an oil-soluble magnesium-alkylbenzene sulfonate of total base number of 400 and higher is obtained by reacting at least on 8.5 to 1.0 molar ratios of magnesium oxide to ammonium alkylbenzene sulfonate at a temperature of from 100.degree. C. to 130.degree. C. under autogeneous pressure in the presence of at least 1.1 weight parts of water and 0.3 to 0.5 of methanol per weight part of magnesium oxide. After decompressing and removing water and methanol, the product high base number magnesium alkylbenzene sulfonate is obtained.

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First Claim