FIELD: preparation of surfactants. SUBSTANCE: method is based on sulfurization of unrectified heavy resin resulting from pyrolysis with spent sulfuric acid followed by neutralization of sulfonated material with sodium hydroxide. Sulfurization reaction is carried out at temperature of 140-150 C, resin to acid weight ratio of 1: 1.8-2, by adding resin to acid. EFFECT: simplified technology for preparing plasticizer and improved plasticizing properties thereof. 1 tbl
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