A cracking aid for increasing the concentration of low-carbon olefins
A technology of low-carbon olefins and catalytic cracking additives, applied in the direction of hydrocarbon cracking, cracking, catalytic cracking, etc., can solve the problem of insufficient concentration of propylene and butene, achieve good coke and dry gas selectivity, and increase octane value, the effect of increasing the concentration of ethylene
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[0027] In the preparation method of the catalytic cracking aid provided by the present invention, the phosphorus-aluminum inorganic binder containing the first clay, based on its dry weight, contains Al 2 o 3 15 to 40% by weight of aluminum components, based on P 2 o 5 45-80% by weight of the phosphorus component and 1-40% by weight of the first clay on a dry basis, the P / Al weight ratio is 1.0-6.0, the pH is 1.0-3.5, and the solid content of the binder is 15 ~60% by weight. The preparation method of the first clay-containing phosphorus-aluminum compound inorganic binder comprises:
[0028] (1) Dispersing the alumina source, the first clay and water into a slurry with a solid content of 8 to 45% by weight; the alumina source is aluminum hydroxide and / or alumina that can be peptized by acid, and The dry basis of the first clay and Al 2 o 3 The weight ratio of the alumina source is 1~40:15~40;
[0029] (2) under stirring, add concentrated phosphoric acid to the slurry obt...
Embodiment 1
[0065] Beta zeolite (Naβ, produced by Qilu Catalyst Factory, SiO 2 / Al 2 o 3 =25, sodium oxide content 4.5% by weight, the same below) with NH 4 Cl solution exchange wash to Na 2 The O content is lower than 0.2% by weight, and the filter cake is obtained by filtration; dried, and the obtained sample is roasted at 350°C for 2 hours, and then heated to 550°C for 4 hours to remove the template agent; take 100g (dry basis) of the above-mentioned molecular sieve and add water Prepare a molecular sieve slurry with a solid content of 10% by weight, add 20g of oxalic acid during stirring, heat up to 80°C and stir for 1h, filter and wash until the filtrate is neutral; add water to the filter cake and beat to obtain a molecular sieve slurry with a solid content of 40% by weight, and mix 6.8gH 3 PO 4 (Concentration 85%) and 3.2gCu(NO 3 ) 2 ·3H 2O was dissolved in 30 g of water, mixed with the molecular sieve slurry, impregnated and dried; the obtained sample was calcined at 550° C...
Embodiment 2
[0068] beta zeolite with NH 4 Cl solution exchange wash to Na 2 The O content is lower than 0.2% by weight, and the filter cake is obtained by filtration; dried, and the obtained sample is roasted at 150°C for 2 hours, then heated to 350°C for 2 hours for 30 minutes, and then heated to 500°C for 4 hours for 30 minutes. Template removal agent: Take 100g of the above-mentioned molecular sieve (dry basis) and add water to prepare a molecular sieve slurry with a solid content of 10% by weight, add 10g of fluosilicic acid during stirring, heat up to 60°C and stir for 1h, filter and wash until the filtrate is neutral; add water to the filter cake Beating to obtain a solid content of 40% by weight molecular sieve slurry, 11.8gH 3 PO 4 (concentration 85%) with 6.3gCuCl 2 Dissolved in 90g of water, mixed with filter cake, soaked and dried; the obtained sample was roasted at 550°C for 2 hours, namely the modified β molecular sieve provided by the present invention.
[0069] Elementa...
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