FIELD: chemical industry. SUBSTANCE: claimed process comprises reacting indene-coumarone resin with SO3 in the presence of SO2 as solvent at SO3 to resin weight ratio from 0.6 to 1.0 by weight; reaction of temperature varies from 20 to 90; SO2 is removed from reaction medium. Sulfurized product is neutralized with aqueous solution of alkali metal or alkaline-earth hydroxide or ammonium hydroxide. The present invention also describes concentrated dispersion of carbon in water and concrete composition which further comprises sulfurized product in saline form as defined in claim 1. The claimed process is simple and suitable in operation, safe for environment and more efficient as compared with well known analogues. EFFECT: more efficient preparation process and improved properties of the concrete composition. 11 cl, 5 ex, 3 tbl
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