Molecular sieve-containing alumina pellet and preparation method thereof

A technology for sieving alumina and containing alumina, which is applied in the field of alumina pellets containing molecular sieve and its preparation, can solve the problems such as the inability to meet the requirements of moving bed reaction, and achieves easy large-scale industrial production, high molecular sieve content and high strength. Effect

Active Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Chinese patent CN104549554A introduces a method for forming molecular sieve into balls. In this method, molecular sieve powder and alumina powder are evenly mixed, and aluminum sol is sprayed in a rotary molding device to be rotated int

Method used

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  • Molecular sieve-containing alumina pellet and preparation method thereof
  • Molecular sieve-containing alumina pellet and preparation method thereof
  • Molecular sieve-containing alumina pellet and preparation method thereof

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preparation example Construction

[0033]The present invention also provides a molecular sieve-containing alumina pellet prepared by the provided preparation method. The specific surface area of ​​the alumina pellet containing molecular sieve can be 150-500m 2 / g, preferably 200-400m 2 / g, the pore volume can be 0.3-1.5mL / g, preferably 0.5-1.3mL / g.

[0034] After the molecular sieve-containing alumina pellets of the present invention are loaded with active components, a catalyst containing molecular sieves can be prepared.

[0035] One embodiment is to prepare a catalyst for aromatization of light hydrocarbons. The catalyst includes alumina pellets containing molecular sieves and zinc, based on the alumina pellets containing molecular sieves, the content of the zinc is 0.1-10% by mass, and the The molecular sieve in the alumina ball containing molecular sieve is ZSM-5 molecular sieve. The catalyst is suitable for C 4 -C 6 Monomer hydrocarbons (such as isobutane) or olefinic light hydrocarbons undergo aroma...

example 1

[0042] (1) Preparation of mixed sols.

[0043] Take 54.8g of high-purity pseudo-boehmite (produced by Condea, Germany, brand SB, containing 40g of alumina) prepared by hydrolysis of alkoxy aluminum, 30.0g of urea and 135g of deionized water and mix and stir for 0.5h to form alumina suspension solution; 2.0 g of nitric acid solution with a concentration of 24% by mass was added dropwise to the aluminum hydroxide suspension as the first acid solution for the first peptization, stirred for 0.5 h, and the pH value was controlled to 3.8 to obtain alumina sol.

[0044] Add 40g of HZSM-5 molecular sieve to the alumina sol, the molar ratio of silica to alumina is 50 (produced by Sinopec Catalyst Changling Branch), and 3.0g of nitric acid solution with a concentration of 24% by mass is added dropwise as the second acid The solution was subjected to the second peptization, the pH value was controlled at 2.5, and stirred at 20°C for 2 hours to obtain a mixed sol, the viscosity of the mix...

example 2

[0052] (1) Preparation of mixed sols.

[0053] Get 54.8g of high-purity pseudo-boehmite (produced by Condea, Germany, brand SB, containing 40g of alumina) prepared by hydrolysis of alkoxy aluminum, 35.0g of urea and 140g of deionized water and mix and stir for 0.5h to form aluminum hydroxide To the suspension, 2.0 g of nitric acid solution with a concentration of 24% by mass was added dropwise as the first acid solution for the first peptization, stirred for 0.5 h, and the pH value was controlled to be 3.8 to obtain alumina sol.

[0054] Add 60g of HZSM-5 molecular sieve to the alumina sol, the molar ratio of silicon oxide to aluminum oxide is 50 (produced by Sinopec Catalyst Changling Branch), and 3.2g of nitric acid solution with a concentration of 24% by mass is added dropwise as the second acid The solution was subjected to the second peptization, the pH value was controlled to 2.3, and stirred at 20°C for 2 hours to obtain a mixed sol, the viscosity of the mixed sol was 1...

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Abstract

The invention relates to a molecular sieve-containing alumina pellet and a preparation method thereof. The preparation method comprises: (1) preparation of a mixed sol: mixing pseudo-boehmite, urea and deionized water to obtain an aluminum hydroxide suspension liquid, adding a first acid solution to the aluminum hydroxide suspension liquid, carrying out first peptization to obtain an alumina sol,mixing the alumina sol and a molecular sieve, adding a second acid solution, and carrying out second peptization to obtain a mixed sol; and (2) preparation of molecular sieve-containing alumina pelletby hot oil column molding: mixing the mixed sol obtained in the step (1) and hexamethylenetetramine, adding into a hot oil column in a dropwise manner, molding to obtain pellets, taking out the molded pellets, washing, drying, and roasting to obtain the molecular sieve-containing alumina pellet. According to the present invention, the obtained molecular sieve-containing alumina pellet has characteristics of high molecular sieve content and high crushing strength.

Description

technical field [0001] The invention relates to a molecular sieve-containing alumina pellet and a preparation method thereof. Background technique [0002] Molecular sieves are widely used in the petrochemical industry due to their unique pore structure and good catalytic performance. Catalysts containing molecular sieves gradually accumulate carbon on the surface as the operating cycle increases, and the activity decreases. In order to maintain activity, the catalyst needs to be regenerated. Since the fixed-bed reactor cannot be regenerated on-line, there is a large difference in catalyst activity between the beginning and end of production, and it is necessary to increase the temperature to maintain activity, which is not conducive to the stability of the operation of the reaction system. The moving bed reactor can realize the continuous operation of reaction and regeneration, and the catalyst activity can be kept constant. In order to realize the moving bed reaction, a...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/18B01J29/22B01J29/70B01J32/00B01J35/08C07C5/27C07C9/16C07C2/00C07C15/02
CPCC07C2/00C07C5/2775B01J29/18B01J29/22B01J29/40B01J29/405B01J29/7007B01J29/7057B01J35/08B01J35/1019B01J35/1038B01J35/1042B01J35/1047C07C2529/22C07C2529/40C07C2529/70B01J2229/18C07C9/16C07C15/02
Inventor 刘建良刘洪全马爱增潘锦程
Owner CHINA PETROLEUM & CHEM CORP
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