In the article catalytic synthesis of light phlegm obtained by catalytic cracking and oligosulfonates separated from it based on the fractions with various boiling temperature were carried out. The effect of the added into the concrete solutions as a plasticizer oligosulfonates to the properties of the obtained concrete samples were investigated and the optimal content were determined. It was shown that samples obtained on the basis of the fractions with the 190–350⁰C and 250–300⁰C boiling temperature have a higher plasticizer properties.