Modified Y type molecular sieve and preparation method thereof

A molecular sieve and modification technology, used in molecular sieve catalysts, chemical instruments and methods, hydrocarbon oil cracking, etc., can solve the problems of large damage to molecular sieve channel structure and skeleton structure, complicated processing process, etc., to improve the modification effect, The effect of improving the reaction environment and simplifying the operation steps

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the modification process of Y-type molecular sieves in the prior art generally has problems such as complex treatment process and relatively large damage to the pore structure and skeleton structure of the molecular sieve.

Method used

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  • Modified Y type molecular sieve and preparation method thereof

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preparation example Construction

[0029] The preparation method of modified Y molecular sieve of the present invention specifically comprises the following steps:

[0030] (1) Preparation of fluorine-containing silicon solution such as ammonium fluorosilicate aqueous solution: take ammonium fluorosilicate and gradually add it to stirred distilled water at a temperature of 30-60°C until the crystals are completely dissolved. After filtration, a clear, transparent and stable solution is prepared. ammonium fluorosilicate solution.

[0031] (2) Take the industrial SSY molecular sieve, put it into the spray immersion tank, and spray the measured mixed solution of fluorine-containing and silicon-containing compounds onto the surface of the molecular sieve; after the spray immersion, it will undergo 30-240 minutes of health preservation, so that the solution can overcome the capillary phenomenon and surface tension are uniformly dispersed on the surface of the molecular sieve; then drying treatment is carried out at ...

Embodiment 1

[0036] (1) Prepare ammonium fluorosilicate aqueous solution, the temperature of the aqueous solution is 35°C, the mass concentration of ammonium fluorosilicate in the aqueous solution is 0.3%, and the molar ratio of fluorine to silicon is 1:3;

[0037] (2) Take the industrially produced SSY molecular sieve, spray and dip the ammonium fluorosilicate aqueous solution prepared in step (1), the spray dipping amount is 200% of the mass of the treated molecular sieve, after 50 minutes of health preservation, dry at a temperature of 150 °C, the drying time For 200min, the dried Y molecular sieve is subjected to hydrothermal treatment, the treatment temperature is 450°C, the water vapor pressure is 0.8MPa, and the hydrothermal treatment time is 50min;

[0038] (3) After the hydrothermal treatment, the molecular sieve was treated in a dilute acid solution with a concentration of 0.5mol / L for 50 minutes, and after solid-liquid separation, the filter cake was washed to neutrality, and the...

Embodiment 2

[0040] (1) Prepare an aqueous solution of ethyl orthosilicate and ammonium fluoroborate, the temperature of the aqueous solution is 55°C, the mass concentration of ammonium fluoroborate in the aqueous solution is 3.6%, and the molar ratio of fluorine to silicon is 3:1;

[0041] (2) Take the industrially produced HY molecular sieve, spray and dip the aqueous solution containing fluorine and silicon prepared in step (1), the spray dipping amount is 40%, after 200 minutes of health preservation, dry at a temperature of 80°C for 40 minutes, The dried Y molecular sieve is subjected to hydrothermal treatment, the treatment temperature is 600°C, the water vapor pressure is 0.1MPa, and the hydrothermal treatment time is 200min;

[0042] (3) After the hydrothermal treatment, the molecular sieve was treated in a dilute acid solution with a concentration of 1.5mol / L for 200 minutes, and after solid-liquid separation, the filter cake was washed to neutrality, and the filter cake was dried ...

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Abstract

The invention discloses a preparation method for a modified Y type molecular sieve. The preparation method comprises the following steps: (1) preparing an aqueous solution containing fluorine and silicon; (2) weighing a low-sodium Y type molecular sieve, spraying and soaking the low-sodium Y type molecular sieve with the aqueous solution containing fluorine and silicon prepared in the step (1), carrying out maintenance for 30 to 240 min, then carrying out drying and subjecting the dried Y type molecular sieve to hydro-thermal treatment; and (3) treating the molecular sieve having undergone hydro-thermal treatment with a weak acid solution with a concentration of 0.2 to 2.0 mol/L, carrying out solid-liquid separation, washing a filter cake until a pH value is neutral and then carrying out drying so as to prepare the modified Y type molecular sieve. The method can prepare the modified Y type molecular sieve with a high silica-alumina ratio, abundant macroporous structures and an appropriately high crystallization degree; and the modified Y type molecular sieve has high macro-molecular hydrocarbon conversion capability and is simple to prepare.

Description

technical field [0001] The invention relates to a modified Y-type molecular sieve and a preparation method thereof, in particular to a high-silicon macroporous modified Y-type molecular sieve and a preparation method thereof, which can be used as an active component of a heavy oil macromolecular hydrocarbon conversion catalyst. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/08C10G47/16
Inventor 杜艳泽秦波刘昶
Owner CHINA PETROLEUM & CHEM CORP
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