| 摘要 |
A fluidifier and stabilizer additive, particularly suitable for coal suspensions in water, based on sulphonated tar, wherein sulphonated and salified tar results to be also oxidized, the oxidation being evidenced by the development of SO2 to the extent of 2 to 60% by wt, w.r.t. the tar during the sulphonation reaction. Also there is a method for the preparation of the additive, consisting in contacting tar with liquid or gaseous SO3, tar and/or SO3 being preferably dissolved in an halogenated organic solvent; the solvent is recovered and the oxidized sulphonated additive is salified. |
