The non-hydrotreating method generally includes procedures of acid-base refining, solvent refining, adsorption refining, adding stabilizer and so on.
Comparing the results given in Tables 2 and 3, it can be seen that the raffinate oil extracted at 60[degrees]C can be saled as 20# heavy diesel and, on the other hand, the raffinate oil can be saturated after treatment in conditions of catalytic cracking, because nitrogen content in the raffinate oil meets the standard of catalytic cracking after solvent refining. Considering the cost consumption, low temperature 60[degrees]C was chosen as the best temperature for extraction.
To get the knowledge of which compounds are removed during solvent refining, the ultimate analysis is prerequisite.
The removal of oxygen-containing compounds is efficient using solvent refining. Oxygen content decreases from 3.53 to 0.45%, and the removal rate is as high as 87.3%.