Pilot scale experiments on denitrogenation process of second vacuum dewaxed oil furfural adding assistants refining
The bench-scale and pilot-scale experiments of denitrogenation refining for the second vacuum dewaxed oil by the method of complex extraction were carried out. The pilot-scale experiments of basic nitrogen compounds removal from the second vacuum dewaxed oil with furfural and mixed solvent with metal salts were mainly introduced. The results showed that the contents of basic nitrogen compounds in dewaxed oil were about 2.31 μg ? g~(-1), rotary oxygen bomb time, viscous index and denitrification rate attained 236 min,119 and 99% ,respectively. The optimal refining operation condition of second vacuum dewaxed oil with furfural in pilot scale experiment was as follows: top and bottom temperature in extraction tower 115℃ and 70℃ respectively, solvent/oil volume ratio 2.0, additive dosage 5g ? kg~(-1) (oil). The later atlapulgite supplement refining could be left out for the purpose of denitrogenation of dewaxed oil.