二甲基亚砜提取物含量大于3%(w/w)的蒸汽裂解C4馏分的碳氢化合物; Hydrocarbons, C4, steam-cracker distillate;Hydrocarbons, C4, steam-cracker distillate Petroleum gas [A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predomina