A method for preparing a calcium overbased alkyl salicylate

The present invention relates to a method for preparing a lubricating oil with a basic calcium alkyl salicylate of the present invention in base oils, alkyl salicylic acid, sulfonic acid and lime as raw materials in the reaction, and then under the action accelerators, high temperature carbonation reaction, and then by distillation, filter aid and other post-treatment, to obtain a different base number calcium alkyl salicylate product, the present invention is solvent-free preparation process and a high-boiling promoter, to reduce the loss of material , increased product yield and equipment utilization, without a solvent system and significantly reduce the environmental pollution.