Modified Beta molecular sieve, and preparation method and application thereof

A molecular sieve and modification technology, applied in the direction of molecular sieve and alkali exchange compound, molecular sieve catalyst, catalyst containing molecular sieve, etc., can solve the problems of low olefin yield and selectivity, insufficient cracking ability of heavy and inferior crude oil, etc., to improve the pore structure , the effect of improving stability

Active Publication Date: 2021-10-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a modified Beta molecular sieve and its preparation method and application in order to overcome the problems of insufficient cracking ability of heavy and inferior crude oil and low yield and selectivity of C4 and below olefins in the prior art. In the cracking reaction, the modified Beta molecular sieve has the characteristics of higher yield of C4 and below olefins and higher butene selectivity

Method used

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  • Modified Beta molecular sieve, and preparation method and application thereof

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Embodiment approach

[0038] According to a preferred embodiment of the present invention, in the modified Beta molecular sieve, the mesopore volume with a pore diameter of 5 nm to 20 nm accounts for more than 85% of the total mesopore volume, more preferably not less than 90%, for example, 90% to 90% of the total mesopore volume. 96%. In this preferred situation, the pore structure of the modified Beta molecular sieve is conducive to improving the catalytic performance of the modified Beta molecular sieve in the catalytic cracking reaction.

[0039] According to the present invention, preferably, the specific surface area of ​​the modified Beta molecular sieve is greater than 500m 2 / g, preferably greater than 530m 2 / g, for example, it can be 530-620m 2 / g. In this preferred situation, it is beneficial to improve the catalytic performance of the modified Beta molecular sieve in the catalytic cracking reaction. In the present invention, the specific surface area is measured by the BET adsorptio...

specific Embodiment approach

[0068] The present invention has a wide selection range for the first solvent described in step (1), as long as the environment in which the Beta molecular sieve contacts with alkali and alkaline earth metal elements can be provided. Preferably, the first solvent is water. The present invention has no particular limitation on the water, which can be water of various hardness, and commonly used tap water, distilled water, purified water and deionized water can all be used. In a specific embodiment of the present invention, the first solvent is neutral water, which is also called distilled water.

[0069] The present invention has a wide range of options for the amount of the first solvent, and can be properly selected according to the amount of the Beta molecular sieve and the compound of alkali and alkaline earth metal, as long as the environment that makes the contact in step (1) can be provided . Preferably, relative to 100 parts by weight of the Beta molecular sieve, the ...

Embodiment 1

[0123] Prepare modified Beta molecular sieve according to the method of the present invention, concrete steps are as follows:

[0124] (1) Take Beta molecular sieve (SiO 2 / Al 2 o 3 Molar ratio is 25; Sodium oxide content 0.05% by weight, the same below) 100g (dry weight), add 600g neutral water (also known as distilled water in the present invention), 20g NaOH solution (molar concentration is 0.833mol / L) and 20g of MgO was heated to 70°C, and after contact reaction for 2 hours, it was cooled to room temperature, then filtered, washed and dried successively to obtain a solid product.

[0125] (2) get the solid product 80g (dry basis weight) that step (1) obtains, make a slurry with 640g water, then add the H of 20% by weight that the weight content of 40g 2 SO 4 1. 60g of oxalic acid, heated up to 70°C, after acid treatment for 2 hours, followed by filtration, washing and drying;

[0126] (3) Take step (2) to obtain 50g (dry basis weight) of product, add 200g neutral wate...

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Abstract

The invention relates to the field of molecular sieve preparation, and discloses a modified Beta molecular sieve. The molecular sieve comprises a Beta molecular sieve and alkaline earth metal elements; on the basis of the dry basis weight of the modified Beta molecular sieve, in terms of oxide, the content of the alkaline earth metal element is 10-30 wt%; the molar ratio of SiO2 to Al2O3 of the modified Beta molecular sieve is 15-45; the mesopore volume of the modified Beta molecular sieve accounts for 20-80% of the total pore volume of the modified Beta molecular sieve; and the crystallinity of the modified Beta molecular sieve is greater than 60%. In a catalytic cracking reaction, the modified Beta molecular sieve has the characteristics of higher yield of C4 and below olefins and higher butene selectivity.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a modified Beta molecular sieve and its preparation method and application. Background technique [0002] The composition and structure of foreign oil processed by catalytic cracking are very complex. The processing raw materials and production processes of each refinery are different, and the demand for target products shows a clear trend of differentiation. The most prominent problem in production is how to process heavy and low-quality raw materials At the same time, it produces clean oil products and high value-added chemical products. Due to the characteristics of gasoline production in my country, the proportion of catalytic cracked gasoline in gasoline blending components is high, generally above 75%, and the proportion of reformed gasoline is low, resulting in generally low gasoline aromatics and benzene content; the proportion of high-octane gasoline blending c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C01B39/46B01J35/10C07C4/10C07C11/08C07C11/06C07C11/04C10G11/05
CPCB01J29/7007B01J29/7057C01B39/46C07C4/10C10G11/05C01P2006/12C01P2006/17B01J2229/186B01J2229/24B01J2229/16C07C2529/70C10G2300/1081C10G2400/26C10G2400/20B01J35/617C07C11/08C07C11/06C07C11/04Y02P20/52
Inventor 张杰潇李家兴于善青凤孟龙杨民田辉平
Owner CHINA PETROLEUM & CHEM CORP
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