Method for online activity recovery of heavy oil hydrotreating catalysts, and agent unloading method
A technology for hydrogenation and activity recovery of heavy oil, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc. Activity, improved catalyst utilization, and reduced downtime effects
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Embodiment 1
[0033] The test was carried out on a high-pressure fixed-bed pilot plant hydrogenation unit. The raw material passed through the reactor from top to bottom. Two reactors were connected in series. The two reactors were filled with protective agent RG-30B and demetallization catalyst RDM-35. , desulfurization catalyst RMS-30, carbon residue removal catalyst RCS-30, calculated by volume, the filling ratio is 1.5:2.5:3:3. The properties of the raw oil used in the test are shown in Table 1. The operating conditions of the hydrogenation reaction are: reaction pressure 14MPa, hydrogen-oil ratio 600 (v / v), liquid hourly volume space velocity 0.2h -1 , After 4000 hours of reaction, the reaction temperature reached 380°C, and the properties of the product are shown in Table 2.
[0034] After 4000 hours, the temperature of the catalyst bed was lowered to 320°C at 8°C / hour, and the proportion of heavy oil in the raw material was gradually reduced at a rate of about 15% by weight / hour, an...
Embodiment 2
[0038] Compared with Example 1, the only difference is that the temperature of the bed is maintained at the normal operating temperature when carrying out the replacement and reactivation reaction with the carrier oil.
[0039] Effect evaluation: After the reaction, adjust the temperature of the catalyst bed to 370°C, and switch the processed raw materials at the same time, gradually replace the carry oil with the original processed heavy oil raw material, the rate of mixing heavy oil is about 15% by weight / hour, and switch all the raw materials After being used as heavy oil raw material, the properties of the product obtained by keeping the catalyst bed at 370°C are shown in Table 2.
Embodiment 3
[0041] The heavy oil hydrogenation test in Example 1 was continued to run for 8000 hours, the reaction operating conditions were the same as in Example 1, the temperature of the catalyst bed reached 395°C, and the properties of the product were shown in Table 3.
[0042] After 8,000 hours, the temperature of the catalyst bed was reduced to 330°C at 10°C / hour, and the proportion of heavy oil in the raw material was gradually reduced at a rate of about 15% by weight / hour. The raw material was a mixture of vacuum gas oil VGO and catalytic heavy cycle oil HCO The weight mixing ratio of oil, HCO and VGO is 1, and the properties of HCO are listed in Table 1.
[0043] After replacing all the raw materials with carrier oil, control the catalyst bed temperature to 330°C, the reaction pressure to 14MPa, the hydrogen-to-oil ratio to 600 (v / v), and the liquid hourly volume space velocity to 0.35h -1 , for an activity recovery reaction. The time was counted from the time when the carried ...
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