Method for combining coal tar fractional distillation and hydro-conversion
A technology of hydroconversion and combined methods, which is applied in the fields of hydroprocessing process, petroleum industry, and hydrocarbon oil treatment, etc. It can solve the problem of unstable properties of full-fraction or wide-fraction coal tar, reduce the void ratio of the catalyst bed, increase the hydrogen Consumption and other issues
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Embodiment 1
[0138] 1. The properties of the initial low-temperature coal tar A are shown in Table 1. With the present invention, the coal tar separation part adopts a vacuum distillation method, and a fractionation tower feed heating furnace is set. The pressure at the top of the fractionation tower is ~ 0.04MPa (absolute pressure). It is the steam stripping section, the upper section of the fractionation tower is the rectification section, and the low-temperature coal tar A is separated into the first fraction composed of the latent fraction of coal tar naphtha at an operating temperature of 40 ° C (conventional low boiling point At 180°C), the second fraction (conventional boiling point is 180-360°C) and the coal tar pitch discharged from the bottom of the tower are drawn from the middle section of the tower.
[0139] ② In the first hydroconversion part, the first distillate is subjected to hydrorefining conversion, and the nitrogen content (average value) of the hydrogenated naphtha is ...
Embodiment 2
[0142] The properties of the initial medium-temperature coal tar B are shown in Table 2. The vacuum distillation method is adopted, and the fractionation tower feed heating furnace is set. The pressure at the top of the fractionation tower is ~0.04MPa (absolute pressure). The upper section is the rectification section, and the medium-temperature coal tar B is separated into the first fraction (light fraction of coal tar (conventional boiling point lower than 300°C)) and the second fraction (bottom oil) discharged from the top reflux tank.
[0143] ② In the first hydroconversion part, the first distillate is subjected to hydrorefining conversion, and the cetane number (average value) of the hydrogenated diesel oil is higher than 35;
[0144] ③ In the second hydroconversion part, the second distillate is hydrorefined, and the heavy oil produced by hydrorefining is hydrocracked. The cetane number (average value) of the hydrogenated diesel oil is higher than 35, and the second hydr...
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