Preparation of overbased calcium sulphonates

Details Preparation of overbased calcium sulphonates Preparation of overbased calcium sulphonates

C - Chemistry, Metallurgy

10

M

253/46, 260/504.

C10M 159/24 (2006.01) C07C 143/00 (1985.01)

Patent

CA 1205819

ABSTRACT PREPARATION OF OVERBASED CALCIUM SULPHONATE 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°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.

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