An integrated method for catalyst carbon deposition removal and catalyst activity evaluation

Abstract

The invention discloses a deactivated catalyst surface carbon deposit online / in-situ removal and catalyst activity evaluation integrated method. The method comprises reacting carbon deposit on the surface of the deactivated catalysts with hydrogen supply solvent for removal and assessing the activity of the catalysts according to the amount of hydrogen produced during the removal process. The applied hydrogen support solvent includes but not limited to 1, 2, 3, 4-tetrahydronaphthalene, 9, 10-dihydroanthracene, 9, 10-dihydrophenanthrene and the like. The deactivated catalyst surface carbon deposit online / in-situ removal and catalyst activity evaluation integrated method is characterized by saving discharging of the catalysts inside a reactor and directly adding the hydrogen supply solvent into the reactor to remove the carbon deposit on the surface of the catalysts, thereby saving the cost for discharging and filling in the catalysts and avoiding the problem of catalyst sintering led bynormal off-line / ex-situ aerated combustion carbon removal. Due to the fact that the catalysts have catalytic effects on the hydrogen-producing reaction of the hydrogen supply solvent, the activity recovery rate of the catalysts can be determined according to the yield change of hydrogen produced during carbon removal. The deactivated catalyst surface carbon deposit online / in-situ removal and catalyst activity evaluation integrated method is applicable to hydrofining and hydrocracking catalysts of various distillate oils.

Description

technical field [0001] The invention relates to an integrated method for in-situ removal of carbon deposits on catalysts and online evaluation of catalyst activity. Background technique [0002] Catalysts used in refining and chemical industries will gradually decrease in activity during long-term operation, partly because raw materials produce carbon deposits during the reaction process on the catalyst surface, so removing carbon deposits is an important method to restore catalyst activity. At present, off-line treatment is used in industry to remove catalyst carbon deposits. The common method is to unload the carbon deposit deactivated catalyst from the reactor, and then carry out oxygen combustion to remove carbon deposits. However, this process releases a lot of heat and the active center of the catalyst It is easy to be sintered, causing problems such as specific surface area reduction and active phase separation, which will lead to permanent catalyst deactivation. In ...

AI Technical Summary

Problems solved by technology

On-line evaluation compares the conversion rate of raw materials at a fixed space velocity or the temperature required to achieve the same conversion rate. It takes a long time, and it is carried out in a different device from the offline decarbonization of the catalyst. The unloading and loading process of the catalyst is cumbersome and the cost is high.