| 摘要 |
A process for the production of a process oil, the process comprising:a) contacting a petroleum distillate with a polar solvent in an extraction column which operates with a bottom temperature of 30 to 80° C.,b) withdrawing a primary raffinate from the column of step a),c) contacting the primary raffinate with a polar solvent in an extraction column which operates at a bottom temperature that is higher than the bottom temperature of the extraction column of step a), and in the range of 60 to 90° C.,d) withdrawing a secondary extract from the column of step c), ande) removing said polar solvent from said secondary extract. |
