O-Xylene → Boric acid, calcium salt

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A solution of 200 g of a calcium carbonate overbased alkylsalicylate (TBN 280 mgKOH/g, calcium content; 10.0 wt. %) and 200 g of xylene were put in a 1000-ml four-necked flask fitted with a condenser and heated to 95° C. while agitating. To this mixture was added 20 g of orthoboric acid, and the temperature was gradually increased to 145° C., while the reaction water was removed by azeotropic distillation by spending time for 1.5 hours. Subsequently, the reactor contents were filtered to obtain a filtrate (solution) which was cooled and then centrifuged to remove any residual solids present. Finally, the xylene was removed in vacuo to obtain a calcium borate overbased alkylsalicylate.

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