Regeneration method of zeolite molecular sieve catalyst

A zeolite molecular sieve and catalyst technology, which is applied in the field of regeneration of zeolite molecular sieve catalysts, can solve problems such as catalyst structure and performance degradation, and achieve small changes in pore structure and acid density, improved regeneration efficiency, and small changes in mass transfer performance.

Inactive Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is the technical problem that the existing regeneration technology causes the structure and performance of the catalyst to decline, and a new regeneration method for the zeolite molecular sieve catalyst is provided

Method used

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  • Regeneration method of zeolite molecular sieve catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Taking the catalytic ammoniation of ethylene oxide on ZSM-5 zeolite to synthesize ethanolamine as an example, the evaluation process conditions: reaction temperature: 90°C, system pressure: 12.0MPa, total liquid phase velocity: 9.0h -1 , the conversion rate of ethylene oxide is 99.5%; after reacting for 900 hours, the activity drops to 60%, and after adopting this scheme, the activity of the catalyst recovers to 85.9%, and the regeneration process of the catalyst is as follows: the deactivated zeolite molecular sieve catalyst is placed In a 10mL fixed-bed reactor, the deactivated catalyst can be a sample after normal reaction deactivation or accelerated deactivation. Nitrogen was introduced into the reactor first, and the temperature of the reactor was raised to 220° C., and the pressure of the entire reaction system was raised to 6.0 MPa. The liquid ammonia is passed into the reactor, the liquid flow rate is controlled at 30-100mL / hr, and the temperature is kept consta...

Embodiment 2～15

[0013] According to the various steps and conditions of Example 1, the regeneration method of the catalyst has been adjusted, except for the type of regeneration medium, regeneration temperature and pressure, the type of deactivated catalyst, etc., and the results are listed in Table 1.

[0014] Table 1

[0015]

[0016] Note: MEA is monoethanolamine.

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Abstract

The invention relates to a regeneration method of a zeolite molecular sieve catalyst to mainly solve technical problems of catalyst structure destroy and catalytic performance decrease caused by present zeolite catalyst regeneration technologies. The method, which allows the problems to be well solved through a technical scheme that the structure and catalytic performances of a regenerated catalyst are near to that of a fresh catalyst by contacting an ammonia-containing raw material with a deactivated catalyst at 100-300DEG C, can be applied to the regeneration of the zeolite catalyst.

Description

technical field [0001] The invention relates to a regeneration method of a zeolite molecular sieve catalyst. Background technique [0002] At present, the regeneration of zeolite molecular sieve catalysts adopts the traditional air atmosphere roasting regeneration method. During the use of the catalyst, the heavy components and deep reaction products in the reaction system occupy the active position of the catalyst or block the pores, resulting in a decline in the catalytic performance of the catalyst. , because these substances have a strong ability to interact with the surface of the catalyst or have a high boiling point and are difficult to remove. However, the catalyst is roasted in an air atmosphere, and high-temperature oxidation treatment is used to convert these substances into small-molecule low-boiling substances, which diffuse out from the bulk phase of the catalyst, so that the active sites of the catalyst are re-exposed or the pores are unblocked. In this tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J38/08B01J38/10B01J29/08B01J29/70B01J29/40
Inventor 冯汝明王德举刘仲能王辉郭友娣吕建刚
Owner CHINA PETROLEUM & CHEM CORP
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