Method for FCC (fluid catalytic cracking) gasoline sweetening
A technology for desulfurization and gasoline, applied in chemical instruments and methods, treatment of hydrocarbon oil, petroleum industry, etc., can solve the problem of inability to realize controllable adjustment of macropore-mesoporous pore size, environmental pollution of gasoline desulfurization, and hydrogenation of diolefins. It has the advantages of not easy coking and deactivation, low price, and improving the desulfanization activity.
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Embodiment 1
[0037] First, 8.0 g of the water-soluble chitosan pore-enlarging agent was added to deionized water at 50° C., and then acetic acid was added dropwise until the chitosan was completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh 1.46g of phosphoric acid and 7.35g of magnesium nitrate respectively, and completely dissolve phosphoric acid and magnesium nitrate in 70g of distilled water to form an aqueous solution containing phosphorus and magnesium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, mix well, then add the mixed solution of phosphoric acid and magnesium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite Knead evenly in the stone, and shape it into a clover shape through kneading-extrusion. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 1 containing phosphorus and magnesium. In carrier 1, phosphorus pentoxide is 0.5wt...
Embodiment 2
[0040]Add 8.0 g of the water-soluble chitosan pore-enlarging agent into deionized water at 50° C., and then add acetic acid dropwise until the chitosan is completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh 1.09g of phosphoric acid and 9.12g of magnesium nitrate respectively, completely dissolve phosphoric acid and magnesium nitrate in 70g of distilled water to form an aqueous solution containing phosphorus and magnesium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, mix well, then add the mixed solution of phosphoric acid and magnesium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite Knead evenly in the stone, and shape it into a clover shape through kneading-extrusion. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 1 containing phosphorus and magnesium. Then use phosphorus and magnesium to modify the surface of the car...
Embodiment 3
[0043] The preparation method of the carrier was carried out according to Example 1. The difference is that the auxiliary component in the carrier also contains cerium, and the water-soluble chitosan pore-enlarging agent is replaced with a non-water-soluble chitosan pore-enlarging agent, and the chitosan formic acid solution is stirred with a magnetic stirrer for 30 minutes to obtain Alumina support with macroporous structure3. The contents of the auxiliary components phosphorus, magnesium and cerium in the carrier are respectively 1.8wt%, 2.0wt%, and 0.6wt% of the weight of the carrier. Its specific surface area and pore size distribution are shown in Table 1.
[0044] Nickel nitrate and ammonium molybdate were prepared as an impregnation solution, and ammonia water was added to adjust the pH value to dissolve all the salts, then the alumina carrier 3 was impregnated, dried at 130°C for 6 hours, and calcined at 750°C for 5 hours to obtain catalyst 3. The main composition of...
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