Study on the Base Oil Production Scheme of the Hydroisomerization Dewaxing Unit at the Terminal Stage of Its Operation
Abstract
At the terminal stage of the unit operation, in order to prolong the service life of the catalyst and reduce the cost of replacing the catalyst, a scheme suitable for producing the base oil at the terminal stage of the catalyst was studied. In the 200kt/a hydroisomerization unit of industrial refinery, the base oil of high-grade lubricating oil was produced by prerefining-hydroisomerization- supplementary refining process, using the dewaxing oil from the vacuum fourth oil as raw material, the results of industrial operation show that the temperature of hydroisomerization reaction is reduced by 8 °C, the treatment capacity is increased by 3 t/h, and the yield of heavy base oil is increased by 15.8% as compared with that of the raw material of the furfural refining oil from the vacuum fourth oil, the total yield of base oil increased by 9.3 percentage points, while the pour point of heavy base oil decreased from -16 °C to -22 °C and the cloud point from -3 °C to -8 °C. The furfural-ketone benzol dewaxing oil from the vacuum fourth oil is suitable to be used as the raw material to produce qualified base oil products at the terminal stage of hydroisomerization unit operation.
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DOI: https://doi.org/10.18686/pes.v4i4.1658
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