Control of nitrogen content in vacuum residue,
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How can the nitrogen content in vacuum residue be controlled? What are the methods?
The higher the distillation range of the oil, the higher its nitrogen content. To control the nitrogen content in residue oil, one method is solvent deasphalting, which can remove more than half of the nitrogen; however, it produces some asphalt, reducing economic efficiency； Another method is hydrotreating of residue; the process is relatively complex, but it yields a better removal effect.