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Regeneration method for toluene methylation catalyst

A toluene methylation catalyst and catalyst bed technology, applied in the field of regeneration of deactivated catalysts, can solve the problems of complex equipment, cumbersome regeneration steps, poor catalyst activity recovery, etc., and achieve good technical effects and good activity recovery effects

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is that the regeneration steps of the toluene methylation catalyst in the prior art are cumbersome, the equipment is complex, and the catalyst activity recovery is not good. A new regeneration method for the toluene methylation catalyst is provided

Method used

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  • Regeneration method for toluene methylation catalyst
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  • Regeneration method for toluene methylation catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The regeneration test was carried out with the deactivated JSM-03 catalyst. The JSM-03 catalyst includes the following components in terms of weight percentage: 69.27% ​​hydrogen-type ZSM-5 molecular sieve with a silicon-aluminum ratio of 280, 30.68% Al 2 o 3 , 0.05% La 2 o 3 .

[0034] The regeneration process is as follows: stop feeding the methylating reagent and toluene raw materials, and circulate hydrogen for 5 hours under the condition of constant reaction temperature and pressure; gradually release the system pressure to normal pressure, and the temperature drops below 100°C; stop introducing hydrogen , disconnect the liquid-phase feed system and product separation system to isolate the reactor system from the liquid-phase feed system and product separation system; replace the reaction system with nitrogen and purge the system with nitrogen to make the total amount of hydrogen and hydrocarbons in the system The concentration is less than 0.2% by volume; at t...

Embodiment 2

[0036] The regeneration test was carried out with the deactivated JSM-03 catalyst.

[0037] The regeneration process is as follows: stop feeding the methylating reagent and toluene raw materials, and circulate water vapor for 3 hours under the condition of constant reaction temperature and pressure; gradually release the system pressure to normal pressure, and the temperature drops below 100 ° C; stop introducing water steam, disconnect the liquid-phase feed system and product separation system, and isolate the reactor system from the liquid-phase feed system and product separation system; replace the reaction system with nitrogen, and purge the system with nitrogen, so that the hydrogen and hydrocarbons in the system The total concentration is less than 0.2% by volume; at the same time, raise the temperature of the reactor so that the temperature of the catalyst bed is 100°C, and adjust the system pressure to 1.0MPa; feed air, observe the temperature rise of the catalyst bed, ...

Embodiment 3

[0039] The regeneration test was carried out with the deactivated JSM-03 catalyst.

[0040]The regeneration process is as follows: stop feeding the methylating reagent and toluene raw materials, and circulate nitrogen for 2 hours under the condition of constant reaction temperature and pressure; gradually release the system pressure to normal pressure, and the temperature drops below 100°C; stop introducing nitrogen , disconnect the liquid-phase feed system and product separation system to isolate the reactor system from the liquid-phase feed system and product separation system; replace the reaction system with nitrogen and purge the system with nitrogen to make the total amount of hydrogen and hydrocarbons in the system The concentration is less than 0.2% by volume; at the same time, raise the temperature of the reactor so that the temperature of the catalyst bed is 250°C, and adjust the system pressure to 0.6MPa; feed air, observe the temperature rise of the catalyst bed, an...

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Abstract

The invention relates to a regeneration method for a catalyst used for methylation of toluene, and mainly solves the problems in the prior art that the regeneration steps of the methylation of toluene are cumbersome, equipment is complex, and catalyst activity is not properly regenerated. According to the invention, material stopping, separation, replacement, oxygen supplying, and other steps are carried out along with the adjustment of temperature and pressure of a reactor; the temperature of a catalyst bed is finally controlled to the constant value of 480-520 DEG C, and the oxygen content of the system reaches 0.45-0.55% by volume; the condition is kept for 1.0-10.0 h before the reaction stops gradually. According to the technical scheme of the regeneration method, the problems in the prior art can be excellently solved, and the method can be applied to the industrial production of mixed xylenes.

Description

technical field [0001] The invention relates to a regeneration method of a deactivated catalyst, in particular to a regeneration method of a toluene methylation catalyst. Background technique [0002] Catalytic reactions are widely used in the field of petrochemical industry, especially the methylation reaction of toluene. This reaction is a new technology for the preparation of mixed xylenes, and the reaction is shown below: [0003] [0004] In the traditional toluene disproportionation process, two molecules of toluene are required to produce one molecule of xylene, and the utilization rate of toluene is low. However, the method of methylation of toluene, that is, the method of synthesizing xylene from toluene and methanol alkyl, only needs to consume one molecule of toluene to produce one molecule of xylene in theory, which greatly improves the utilization rate of toluene and has high economic added value. [0005] Toluene methylation reaction adopts solid acid cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/20B01J29/90C07C15/08C07C2/86
CPCY02P20/52Y02P20/584
Inventor 董骞宋曙光阮畋李华英胡慧锋孔德金
Owner CHINA PETROLEUM & CHEM CORP
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