| 摘要 |
<p>An oil feedstock (6) is upgraded wherein the feedstock is hydrocracked, flashed and/or distilled. The bottoms are then vacuum distilled to adjust viscosity and volatility. The refined feed (30) is then dewaxed under high pressure by a medium pore molecular sieve. The dwaxed material (38) is then cascaded to a hydrofinishing step, where it is contacted with an aromatics saturation catalyst having a metal hydrogenation function in order to produce, after appropriate flashing and distillation, lubricant products having high Viscosity Index, low aromatics content, low volatility and excellent stability to light in the presence of oxygen.</p> |
