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Regeneration method of inactivated propane dehydrogenation catalyst

A dehydrogenation catalyst, propane dehydrogenation technology, applied in the direction of catalyst regeneration/reactivation, catalyst, molecular sieve catalyst, etc., can solve the problems of Pt active component aggregation and growth, dehydrogenation performance decline, catalyst deactivation and other problems, to achieve recovery Catalyst performance, sintering mitigation, agglomeration reduction effects

Active Publication Date: 2021-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the content of chloride ions in the catalyst, the catalyst needs to be subjected to high-temperature hydrothermal treatment. This process will cause the Pt active components to aggregate and grow, and even cause the sintering of Pt, which will permanently deactivate the catalyst.
During the reaction process, the Pt catalyst needs to be exposed to hydrogen for dehydrogenation. Although it can reduce the deactivation rate of the catalyst, as the reaction time prolongs, the dehydrogenation performance of the catalyst will also decrease due to carbon deposition.

Method used

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  • Regeneration method of inactivated propane dehydrogenation catalyst

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Embodiment approach

[0077] According to a preferred embodiment of the present invention, preferably, the content of the active component is 0.1-0.6%.

[0078] According to a preferred embodiment of the present invention, preferably, the content of the transition metal is 0.1-2%.

[0079] According to a preferred embodiment of the present invention, preferably, the content of the alkali metal is 0.1-1%.

[0080] According to a preferred embodiment of the present invention, preferably, the active component, the alkali metal and the transition metal are loaded onto the carrier by vacuum impregnation.

[0081] According to a preferred embodiment of the present invention, preferably, the active component is Pt and / or Pd.

[0082] According to a preferred embodiment of the present invention, the alkali metal is one or more of Li, Na, K and Cs, preferably Na and / or K.

[0083] According to a preferred embodiment of the present invention, the transition metal is one or more of Sn, Fe and Zn.

[0084] ...

Embodiment 1

[0145] (1) Synthetic molecular sieve: 180.25 grams of solid content are 20% silica sol dissolved in 180 grams of deionized water, then add 72.89 grams of cetyltrimethylammonium bromide (hereinafter referred to as CTABr) and 6.66 grams of aluminum sulfate, The above sample was stirred at room temperature for 3 hours to form a homogeneous gel. The substances in the gel are calculated by molar ratio: SiO 2 :Al 2 o 3 :CTABr:H 2 O=300:1:20:1000. The above sample was moved into a high-pressure reactor, and crystallized at 170°C for 60 hours. The crystallized product was filtered and washed until neutral, then dried at 120°C, and then calcined at 500°C for 4 hours to obtain the original powder of MFI molecular sieve. The prepared sample was added to a sodium hydroxide solution with a mass concentration of 1.0% (hereinafter referred to as the mass concentration), and the temperature was maintained at 70° C. for 5 hours. The sample treated with lye was filtered, dried, and roasted...

Embodiment 2

[0151] Dehydrogenation catalyst sample B after deactivation by dehydrogenation reaction, first in N 2 Cool down under conditions, the temperature is 400°C, and CO is introduced at a rate of 20ml / min. 2 Gas, the regeneration time is 10 hours; then continue to cool down to 300°C, and treat with oxygen and water vapor for 2 hours, wherein the molar ratio of oxygen:water vapor is 1:3; after the above steps are completed, use a flow rate of 50ml / min Nitrogen blows out oxygen and water vapor, the temperature continues to drop to 100°C, and ethylene glycol is passed into the catalyst at a rate of 1ml / min for 3 hours; then, under the protection of nitrogen, the temperature is raised to 450°C, and pure H 2 For reducing gas, the treatment time is 0.5 hours. The regenerated catalyst is denoted as R1, and the evaluation method is the same as in Example 1. The results after 3 days of reaction are shown in Table 2.

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Abstract

The invention relates to the field of catalysts, and particularly provides a regeneration method of a deactivated propane dehydrogenation catalyst, which comprises the following steps of: (a) coolinga deactivated dehydrogenation catalyst subjected to propane dehydrogenation reaction to 300-500 DEG C in an inert gas atmosphere, and carrying out regeneration treatment in a weak oxidizing gas atmosphere at the temperature; (b) continuing to cool to 200-300 DEG C in an inert gas atmosphere, and carrying out regeneration treatment in a mixed gas atmosphere containing at least two of oxygen, watervapor and inert gas at the temperature; and (c) after the step (b) is finished, replacing the mixed gas with inert gas until the temperature is reduced to 50-100 DEG C in an inert atmosphere, and carrying out regeneration treatment at the temperature in the presence of organic matters; wherein the dehydrogenation catalyst is a catalyst containing noble metal. The method can effectively recover theperformance of the catalyst and improve the utilization rate of the catalyst.

Description

technical field [0001] The invention relates to a regeneration method of a deactivated propane dehydrogenation catalyst. Background technique [0002] As an important basic organic chemical raw material, propylene is in great demand, and its annual consumption is greater than that of ethylene. Conventional ethylene co-production light oil (naphtha, light oil) cracking method has been difficult to meet its growing needs. With the development of coal chemical technology and special propylene production technology, the sources of propylene are diversifying. Dehydrogenation of propylene from abundant propane feedstock has become one of the main production methods of propylene. Propane dehydrogenation reaction is a strong endothermic reaction, limited by thermodynamic equilibrium, ideal propylene yield can only be obtained under low pressure and high temperature conditions, while excessively high reaction temperature will intensify propane cracking reaction and deep dehydrogena...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/90B01J38/04B01J38/16B01J38/52B01J38/10B01J38/02C07C5/333C07C11/06
CPCB01J29/74B01J29/90B01J38/04B01J38/16B01J38/52B01J38/10B01J38/02C07C5/3337C07C2529/74C07C11/06Y02P20/584
Inventor 吴省洪学思缪长喜吴文海
Owner CHINA PETROLEUM & CHEM CORP
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