| 摘要 |
<p>A semicontinuous process for solvent dewaxing a waxy petroleum oil feed stream by diluting a waxy oil feed stream (1) with solvent (2), heating the mixed waxy oil/solvent stream to dissolve wax crystals present therein, cooling the mixture to precipitate any wax crystals not soluble in the solvent, filtering the wax crystals from the mixed petroleum oil/solvent stream with a filter (11), contacting the cold filtrate under pressure with a selective permeable membrane (7), so as to selectively permeate the solvent and thereby separate the solvent from the dewaxed petroleum oil, and periodically stopping the permeation process and directing a warm stream of solvent onto the selective permeable membrane surface to wash the membrane and remove impurities therefrom.</p> |
