Abstract: The high alkaline calcium sulfonate was prepared by multistep method using acid materials from different sources. The parameters of ratio of domestic and foreign sulfonic acids, the amount of water added, the flow rate of carbon dioxide and the volume of methanol were changed to test the effect on the performance of the sulfonate products. The results showed that the best systhetic conditions are: the ratio of domestic sulfonic acid D and foreign one of 9:1, water 2.5g, CO2 flow rate 400ml/min, dosage of methanol 26ml. At these conditions, the obtained sulfonate has a high TBN, low turbidity, low motion viscosity and the product is easy to filter.

Key words: high alkaline, calcium sulfonate, sulfonic acid