A kind of regeneration method of deactivated propane dehydrogenation catalyst

A dehydrogenation catalyst and 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, etc., and achieve recovery Catalyst performance, sintering reduction, agglomeration reduction effects

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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  • 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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  • A kind of regeneration method of deactivated 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 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 supported on the carrier by a method of 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.

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Embodiment 1

[0145] (1) Synthesis of molecular sieve: dissolve 180.25 grams of silica sol with a solid content of 20% 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 substance in the gel is calculated in molar ratio: SiO 2 :Al 2 O 3 :CTABr:H 2 O=300:1:20:1000. The above sample was transferred into an autoclave, crystallized at 170°C for 60 hours, the crystallization product was filtered and washed to neutrality, dried at 120°C, and calcined at 500°C for 4 hours to obtain MFI type molecular sieve raw powder. The prepared sample was added to a 1.0% mass concentration of sodium hydroxide solution (the following are all mass concentrations), and the temperature was maintained at 70° C. for 5 hours. The sample treated with alkali solution was filtered, dried and roasted for later use, and t...

Embodiment 2

[0151] Dehydrogenation catalyst sample B after deactivation of dehydrogenation reaction 2 The temperature was lowered to 400°C, and CO was introduced at a flow rate of 20ml / min. 2 gas, regeneration time for 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 50ml / min flow rate Nitrogen blows out oxygen and water vapor, the temperature continues to decrease to 100°C, and ethylene glycol is introduced into the catalyst at a rate of 1ml / min for 3 hours; then, under nitrogen protection, the temperature is raised to 450°C, and pure H is introduced 2 For reducing gas, the treatment time is 0.5 hours. The regenerated catalyst is denoted as R1, the evaluation method is the same as that of Example 1, and 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 specifically provides a method for regenerating a deactivated propane dehydrogenation catalyst, the method comprising: a) deactivating the dehydrogenation catalyst in a propane dehydrogenation reaction, first cooling it in an inert gas atmosphere to a temperature of 300 ℃ -500°C, at this temperature, perform regeneration treatment in a weakly oxidizing gas atmosphere; b) then continue to cool down to 200-300°C in an inert gas atmosphere, at this temperature, under the atmosphere containing oxygen, water vapor and inert gas Carry out regeneration treatment under a mixed gas atmosphere of at least two of them; c) after step b) finishes, replace the mixed gas with an inert gas to the inert atmosphere and drop the temperature to 50-100 ° C, at this temperature, in the presence of organic matter Carry out regeneration treatment; the dehydrogenation catalyst is a catalyst containing precious metals. The method of the invention can effectively restore the performance 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. It is difficult to meet the increasing demands of the conventional ethylene co-production light oil (naphtha, light diesel) cracking method. With the development of coal chemical technology and propylene production technology, there is a trend of diversification of propylene sources. The production of propylene by dehydrogenation of abundant propane raw materials 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 be obtained under low pressure and high temperature conditions, and excessively high reaction temperature aggravates the propane cracki...

Claims

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Application Information

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Patent Type & Authority Patents(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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