Catalytic cracking aid containing Beta molecular sieve rich in mesopores, and preparation method thereof

A technology of molecular sieves and additives, which is applied in the field of catalytic cracking additives and their preparation, can solve the problems of molecular sieve pore structure damage, long preparation process, and no adjustment of aluminum distribution on the surface, so as to increase liquid absorption and octane number Effect

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Problems solved by technology

[0038] In the above-mentioned methods for preparing multi-stage β, there are problems such as the use of organic ammonium salt sewage is not easy to handle, the preparation process is long, the molecular sieve pore structure is destroyed, and the distribution of aluminum on the surface is not adjusted.

Method used

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  • Catalytic cracking aid containing Beta molecular sieve rich in mesopores, and preparation method thereof
  • Catalytic cracking aid containing Beta molecular sieve rich in mesopores, and preparation method thereof
  • Catalytic cracking aid containing Beta molecular sieve rich in mesopores, and preparation method thereof

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preparation example Construction

[0064] The present invention also provides a preparation method of catalytic cracking additive, the preparation method comprising: mixing Beta molecular sieve rich in mesoporous, inorganic oxide binder and water, adding or not adding clay, beating, and spray drying; wherein , introducing or not introducing phosphorus additives, introducing or not introducing Group VIII metal additives; by weight and based on the dry basis weight of the preparation raw materials of the auxiliary agent, the preparation raw materials of the auxiliary agent contain 10 - 75% by weight of mesoporous-rich Beta molecular sieve, 0-60% by weight of clay on a dry basis, 15-60% by weight of an inorganic oxide binder on a dry basis, expressed as P 2 o 5 0-25% by weight of phosphorus additives and 0-15% by weight of group VIII metal additives in terms of oxides; the Al distribution parameter D of the molecular sieve satisfies: 0.4≤D≤0.8, wherein, D=Al(S ) / Al(C), Al(S) means the aluminum content in any regi...

Embodiment 1

[0086] With 100gBeta molecular sieve (catalyst Qilu branch production, SiO 2 / Al 2 o 3 =25, the sodium oxide content is 4.5% by weight, the same below; dry basis mass) is added with water and beaten to obtain a molecular sieve slurry with a solid content of 10% by weight, and 11.4g of high alkali sodium metaaluminate solution (Na 2 O is 290g / L, Al 2 o 3 40g / L, the solution density is 1.353g / mL), heated to 50°C and stirred at a constant temperature for 0.5h, filtered and washed until neutral; the filter cake was beaten with water to obtain a molecular sieve slurry with a solid content of 20% by weight, and 5.3g Oxalic acid, then slowly add 51g hydrochloric acid (mass fraction 10%) and 17g fluosilicic acid (concentration 20%) dropwise at the same time, raise the temperature to 50°C and stir at a constant temperature for 1h, filter, wash and dry to obtain molecular sieve sample A, the physical and chemical properties of molecular sieve sample A are listed in Table 1.

Embodiment 2

[0104]Add water to 100g Beta molecular sieve (mass on dry basis) to prepare a molecular sieve slurry with a solid content of 10% by weight, add 16g NaOH (purity 96%), heat up to 50°C and stir at a constant temperature for 0.5h, filter and wash until neutral; add water to beat the filter cake to obtain a solid Molecular sieve slurry with a content of 20% by weight, 16g of oxalic acid was added during stirring, and then 108g of hydrochloric acid (mass fraction 10%) and 26g of fluosilicic acid (concentration of 20%) were slowly added dropwise at the same time, the temperature was raised to 50°C and stirred at a constant temperature for 1 hour, filtered, washed and dried Molecular sieve sample B was obtained, and the physicochemical properties of molecular sieve sample B are listed in Table 2.

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Abstract

The invention discloses a catalytic cracking aid containing a Beta molecular sieve rich in mesopores, and a preparation method thereof. The catalytic cracking aid comprises, on the basis of the dry base weight of the aid, 10 to 75 wt% of the Beta molecular sieve rich in mesopores in terms of a dry base, 0 to 60 wt% of clay in terms of a dry base, 15 to 60 wt% of an inorganic oxide binder in termsof a dry base, 0 to 25 wt% of a phosphorus additive in terms of P2O5 and 0 to 15 wt% of a group-VIII metal additive in term of oxide, wherein the distribution parameter D of Al in the molecular sieveis no less than 0.4 and no more than 0.8; the micropore specific area of the molecular sieve is 350 to 500 m<2>/g; the mesopore volume of the molecular sieve accounts for 30 to 70% of total pore volume. The aid can improve the yield of isobutene and propylene and the octane number of gasoline when applied to catalytic cracking.

Description

technical field [0001] The invention relates to a catalytic cracking aid containing mesoporous-rich Beta molecular sieve and a preparation method thereof. Background technique [0002] Low-carbon olefins Olefin is an important organic chemical raw material, and the world's demand for low-carbon olefins is increasing year by year. Fluid catalytic cracking is one of the important processes for producing low-carbon olefins. For most catalytic cracking units, adding additives is an effective technical way to increase the production of low-carbon olefins. However, the prior art has no obvious effect on increasing the concentration of isobutene in liquefied gas. From the perspective of isobutene formation and reaction chemistry in the FCC process, β molecular sieve (also known as β zeolite, beta molecular sieve) is an effective active component. The main problem of β molecular sieve in use is that on the one hand, its structure is easily damaged during the process of removing it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/76C10G11/05
CPCB01J29/7007B01J29/7615B01J2229/16B01J2229/37C10G11/05
Inventor 陈振宇朱玉霞周灵萍张蔚琳田辉平刘建强罗一斌
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