The denitrification effect of the third-line oil is reduced by processing and the denitrification effect of the third-line oil is reduced. Under the condition of the agent-to-oil ratio of 1B390, the average denitrification rate is about 44%, and the total denitrification rate is about 71% after refining with clay; due to the base oil product tank The maximum rotating oxygen bomb is only 10min higher than the control index, so it can be considered that under the condition of raw material alkali nitrogen, the agent-to-oil ratio of 1B390 is close to the minimum limit of adding denitrification agent. The influence of different feedstock oils on the denitrification effect The influence of feedstock oils with different viscosities on the denitrification effect under the same agent-oil ratio. As the raw materials increase and the viscosity increases, the denitrification effect decreases, while the increase in the acid value of the denitrified oil indicates that the denitrification tail oil sedimentation effect of the refining tank becomes worse.
The effect of denitrification and refining temperature on the denitrification effect, as the refining temperature increases, the denitrification effect tends to decrease. The recommended temperature for the denitrification agent is 7080e. According to the processing load of the front furfural unit as high as 160%, and the cooling condition before entering the denitrification system, the refined temperature can be controlled at 8085e. Too much lower temperature will increase the cooling load of furfural refined oil and increase the consumption of cooling water, but the increase in denitrification effect is not significant. There is no obvious difference in the quality of base oil produced by the two processes, and both meet the requirements of the professional standard index of base oil.
At present, the denitrification system has the problem that the acid value after denitrification is too large, that is, the degree of sedimentation after the reaction of the denitrification agent is not good, resulting in the residue of the denitrification refined oil, and with the increase of the feed oil, the acid value increases after the denitrification. Analyze the reasons. One of the reasons is that the mixing and dispersion of the static mixer is too large, which causes the droplet size after the denitrification agent to be too small, and it is difficult to coalesce and grow. Part of the denitrification agent after the reaction cannot settle down and be carried into the refined oil.
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