Regeneration method of molecular sieve catalysts

A molecular sieve and catalyst technology is applied in the field of regeneration of molecular sieve catalysts, which can solve the problems that molecular sieve catalysts cannot be reused and the regeneration process is complicated, and achieve the effects of shortening the impregnation time, increasing the roasting temperature and improving the catalytic performance.

Active Publication Date: 2009-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the regenerated molecular sieve catalyst cannot be reused, and the regeneration process is complicated. A new molecular sieve catalyst is provided Catalyst regeneration method

Method used

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  • Regeneration method of molecular sieve catalysts

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Experimental program
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Effect test

Embodiment 1

[0018] Take the SiO containing 60 grams of initial silicon-aluminum molar ratio 2 / Al 2 o 3 (The same below) is a ZSM-5 molecular sieve catalyst of 30, after carrying out the catalytic cracking reaction of naphtha at 650°C for 4 hours, burning carbon for 2 hours under the condition that the air flow rate at 650°C is 400 ml / min, after cooling, use 0.1 The mole / liter oxalic acid solution was washed with water, filtered twice, and dried in an oven at 130°C to obtain a dealuminized and deactivated catalyst without carbon deposition. The silicon-aluminum molar ratio of SiO was determined by atomic absorption spectrometry. 2 / Al 2 o 3 for 80. Put it into 100 ml of 1 mol / L aluminum sulfate solution and stir at a constant temperature of 50°C for 1 hour, then put it in an oven and dry it at 120°C for 2 hours, then put it in a muffle furnace, and bake it at 800°C for 5 hours under a nitrogen atmosphere , the sample was taken out and cooled, washed twice with distilled water, and dr...

Embodiment 2～7

[0020] According to the method and content provided in Example 1, the aluminum supplementation conditions are shown in Table 2, and the silicon-aluminum ratio before and after aluminum supplementation was measured by atomic absorption spectroscopy, and the catalyst after aluminum supplementation was obtained, as shown in Table 2.

[0021] Table 2

[0022]

Embodiment 8

[0024] Aluminum supplementation was carried out according to the method of Example 7, and the aluminum supplementation was repeated 3 times before washing with distilled water. The prepared catalyst SiAl molar ratio SiO 2 / Al 2 o 3 is 56.2.

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Abstract

The invention relates to a regeneration method for molecular sieve catalysts, and mainly solves the problems that the regenerated molecular sieve catalyst fails to long-term repeated use and the prior regeneration method has complicated process. The regeneration method comprises the following steps: firstly removing carbon deposits or other surface-attached substances by burning dealuminated deactivated molecular sieve catalyst in oxygen-enriched atmosphere; then compounding an aluminum salt solution (aluminum concentration in the range from 0.4 mol / L to 4 mol / L) containing aluminum in an amount 1 to 5 times of the required Si-Al ratio, calculated on the basis of the molecular sieve contained in the catalyst in the form of pure silicon molecular sieve; and finally allowing the impregnation contact between the aluminum salt solution and the catalyst, drying, and calcining in inert atmosphere to obtain the regenerated catalyst. With the realumination technical scheme, the regeneration method overcomes the problems in the prior art and is applied to the industrial production of alkenes via catalytic cracking of petroleum naphtha.

Description

technical field [0001] The invention relates to a regeneration method of a molecular sieve catalyst. Background technique [0002] Molecular sieve catalysts are widely used in petrochemical and other fields due to their strong acidity, good shape-selective catalytic performance and good thermal stability. However, since the molecular sieve catalyst is prone to skeleton dealumination in the environment of high temperature or high temperature water vapor, the loss of active sites of the catalyst will cause deactivation, and it is necessary to regenerate the catalyst with aluminum supplementation to restore the activity of the catalyst. [0003] The literature (Petroleum Refining and Chemical Industry, 2004, 35(5), 15-18) reported that the aluminum-enriched zeolite beta catalyst was prepared by adding aluminum salt in one molding method, and combined with the reaction activity evaluation experiment, it was proved that adding aluminum can make the acid content of the catalyst I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J38/68
Inventor 谢在库马广伟滕加伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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