Abstract: Using olefins with different chain length and salicylic acid as raw materials, calcium salicylates with different alkyl structure were synthesized by alkylation and calcification. The performance differences of the products in high temperature detergency, oxidation resistance, sludge dispersion properties, anti-foam property, anti-emulsification property and colloid stability were investigated. The results show that the change of alkyl carbon number of the calcium alkyl salicylate is the main reason for performance differences. The calcium alkyl salicylates with alkyl carbon number of 12 to 18 possess better high temperature detergent resistance, oxidation resistance, sludge dispersion property and colloid stability. When the alkyl carbon number is 20-22, the calcium alkyl salicylates have better resistance to foaming and anti-emulsifying abilityies.

Key words: alkylation, calcium alkyl salicylate, detergent