| 摘要 |
The object of the invention is the use of phosphonic acids of the formula (4)where Ris H or C-C-alkyl, and Rand Rindependently from each other are H or C-C-alkyl, with the proviso that not all groups R, R, Rare hydrogen, and having a molecular weight from 250 to 10,000 units, for the dispersion of asphaltenes in asphalt-containing crude oils or residual oils in quantities from 0.5 to 10,000 ppm with respect to asphalt-containing crude oils or residual oils. |
