Regeneration method of aluminum compensation for molecular sieve

A molecular sieve, pure silicon molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of molecular sieve catalysts that cannot be reused and the regeneration process is complicated, achieve good catalytic performance, shorten diffusion time, the effect of increasing activity

Active Publication Date: 2009-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the molecular sieve catalysts regenerated in the prior art cannot be reused repeatedly, and the regeneration process is complicated. A new method for regenerating molecular sieves with aluminum supplementation is provided

Method used

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  • Regeneration method of aluminum compensation for molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take SiO containing 60 grams of silicon-aluminum molar ratio 2 / Al 2 o 3 (The same below) is the catalyzer of the ZSM-5 molecular sieve of 30, the catalyst after the dealumination is obtained after 5 hours with the water vapor treatment of 1 hour-1 with space velocity at 650 ℃, washes with the oxalic acid solution of 0.1 mol / liter, Filter twice, dry in an oven at 130°C, and use atomic absorption spectrometry to measure the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 85, then put it into a muffle furnace and bake it to 500°C, take it out and quickly put it into 100ml of 1mol / liter aluminum sulfate solution, stir for 0.5 hours, filter, and then put it in an oven for 2 hours at 120°C. Then put it into a muffle furnace, roast at 550°C for 3 hours, take out the sample to cool, wash twice with distilled water, and dry at 130°C for 3 hours, then the catalyst after aluminum supplementation is obtained, and the silicon-alumina concentration is determined by atomic abs...

Embodiment 2～7

[0021] According to the method and content provided in Example 1, the aluminum supplementation conditions are shown in Table 2, and the silicon-aluminum molar ratio before and after aluminum supplementation was measured by atomic absorption spectroscopy, and the catalyst after aluminum supplementation was obtained in Table 2.

[0022] Table 2

[0023]

Embodiment 8

[0025] 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 42.1.

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Abstract

The invention relates to a molecular sieve aluminum replenishment regeneration method which is mainly used for solving the problems that a regenerated catalyst of the prior art can not be repeatedly used for a long time and the regeneration process is complicated. The method counts a molecular sieve as the pure silicon molecular sieve during the regeneration process of the catalyst, uses 1 to 5 times of the needed molar ratio of silicon to aluminium to prepare aluminium salt solution with the aluminium concentration of 0.4 to 5 mol / L and carries out the contact with the catalyst, the filtration and the calcination to obtain the regenerated catalyst; therefore, the aluminum replenishment technical proposal can better solve the problems. The method can be used in the industrial production for the catalytic cracking of the naphtha to olefins.

Description

technical field [0001] The invention relates to a regeneration method of molecular sieve supplementing aluminum. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J29/06
Inventor 马广伟谢在库滕加伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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