Preparation of overbased calcium sulphonates.

摘要

The problem of sludge formation is avoided in the preparation of high base number calcium sulphonates in good yields by carbonating a mixture of: a) an oil-soluble sulphonic acid or an alkaline earth metal sulphonate, b) a hydrocarbon solvent c) a C1-15 alcohol, preferably methanol, d) oil, and e) excess calcium hydroxide, at a temperature not exceeding 35 DEG C, heat soaking the carbonated mixture, and then separating the heat soaked product into an alcohol/water phase and a solvent/oil phase. The alcohol/water phase is removed before stripping the solvent/oil phase to yield the overbased product.