| 摘要 |
A composition and process for preparing an overbased calcium sulfonate, in which a specific class of compounds is employed as promoters in making overbased calcium sulfonates. These promoters give an enhanced efficiency of the conversion of lime to an oil-soluble dispersion of calcium carbonate. Low post-carbonation solids and high TBN (total base number of alkaline reserve) result from this improve promoter system. The process for preparing highly basic calcium sulfonate includes contacting an acidic gas at a temperature between 60 DEG F. to 103 DEG F., with a mixture of a sulfonic acid or calcium salt thereof, a hydrocarbon solvent, calcium hydroxide, a small quantity of co-promoter methanol, and up to 1.0% by weight of a compound with formula: <IMAGE> (I) where X=O, S, =CH, -CH2, -NH or -N= Y=O, N or S; R=H or, C1 to C50; and R'=H, CH2CH2OH, or CH2CH2NH2 when Y is N, and zero when Y is O or S. The above membered cyclic rings can be saturated and unsaturated, and include as preferred compounds, imidazolines, oxazolines and pyrroles, and saturated and unsaturated analogs thereof.
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