A kind of regeneration method of titanium-silicon molecular sieve catalyst deactivated by oxidation reaction

A titanium-silicon molecular sieve and oxidation reaction technology, which is applied in molecular sieve catalysts, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve the problem of high energy consumption, and achieve high energy consumption, complex regeneration process, and high cost.

Active Publication Date: 2011-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The main problem with this method is the high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 5g of the deactivated catalyst was mixed and washed with 50g of formic acid and 50g of hydrogen peroxide (30wt%) at 90°C under normal pressure for 8h, followed by washing, filtering and drying. The dried regenerant is then calcined for 6 hours by mixing water vapor and oxygen at 1:1 at 300°C. The evaluation experiment shows that the selectivity of propylene oxide is 97.52%, and the conversion rate of hydrogen peroxide is 42.00%.

Embodiment 2

[0042] 5g of the deactivated catalyst was mixed and washed with 50g of formic acid and 50g of hydrogen peroxide (30wt%) at 90°C under normal pressure for 8h, followed by washing, filtering and drying. The dried regenerant is then calcined for 12 hours by mixing water vapor and oxygen at 300°C in a ratio of 1:1. The evaluation experiment shows that the selectivity of propylene oxide is 98.02%, and the conversion rate of hydrogen peroxide is 43.00%.

Embodiment 3

[0044] 5g of the deactivated catalyst was mixed and washed with 50g of formic acid and 50g of hydrogen peroxide (30wt%) at 80°C under normal pressure for 8h, followed by washing, filtering and drying. The dried regenerant is then calcined with a 1:1 mixture of water vapor and oxygen at 300°C for 6 hours. The evaluation experiment shows that the selectivity of propylene oxide is 97.40%, and the conversion rate of hydrogen peroxide is 40.50%.

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Abstract

The invention discloses a method for regenerating a deactivated titanium-silicon molecular sieve catalyst in an oxidation reaction, which is characterized in that the method comprises treating the deactivated titanium-silicon molecular sieve catalyst with an aqueous hydrogen peroxide solution or a mixed solution of hydrogen peroxide and an organic acidic compound, The step of firing under the mixed atmosphere of water vapor and oxygen.

Description

technical field [0001] The present invention relates to a regeneration method of a deactivated titanium-silicon molecular sieve catalyst, and more particularly, the present invention relates to a regeneration method of a deactivated titanium-silicon molecular sieve catalyst used in an oxidation reaction. technical background [0002] In 1983, Italian scientist Taramasso et al. discovered a titanium-silicon molecular sieve with an MFI structure, which exhibited excellent catalytic performance in catalytic oxidation reactions. Since then, titanium-silicon molecular sieves have been widely used in the direct oxidation reaction of hydrogen peroxide and organic matter, such as the ammoximation reaction of aromatics, olefins, alcohols, nitrogen-containing compounds, and carbonyl-containing compounds. However, usually after a period of operation, the catalytic performance of the catalyst will deteriorate, and the catalyst will be deactivated. The cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/90B01J29/89B01J38/16B01J38/70
Inventor 林民王梅正朱斌汝迎春舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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