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Method of filling maleic anhydride catalysts through benzene

A technology of benzene-process maleic anhydride and catalyst, which is applied in the field of benzene-process maleic anhydride catalyst loading, can solve the problems of uneven loading of dual-stage bed catalysts, and achieve the effects of solving uneven loading, preventing bridging, and reducing adverse effects

Inactive Publication Date: 2016-04-13
TIANJIN BOHUA ZHONGHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a loading method of benzene process maleic anhydride catalyst to solve the problem of uneven loading of dual-stage bed catalysts in the prior art

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Loading of the second-stage catalyst: Divide the catalyst bed into unequal divisions, and load the catalyst from bottom to top. The two-stage catalysts are called the second-stage catalyst and the first-stage catalyst respectively. The catalyst is loaded by a filling machine, and the second-stage catalyst is loaded In the hopper of the filling machine, the corresponding number of reactor tubes can be filled at the same time according to the number of feeding tubes of the filling machine. After filling, measure the filling height of the second-stage catalyst. If the deviation height of the second-stage catalyst exceeds the allowable range, use a vacuum cleaner to suck out part of the second-stage catalyst; if the deviation height of the second-stage catalyst is within the allowable range, then each The second-stage catalyst of the reaction tube is tested for pressure drop, and the average pressure drop of each tube is taken. If the pressure drop of the second-stage cataly...

Embodiment 2

[0026] Loading of the first-stage catalyst: If the filling height and pressure drop of the second-stage catalyst are within the allowable range, then the first-stage catalyst will be loaded. If the deviation height of the first-stage catalyst exceeds the allowable range, use a vacuum cleaner to suck out part of the first-stage catalyst. When the first-stage catalyst If the deviation height of the catalyst is within the allowable range, the pressure drop test is carried out on the total catalyst bed, and the average pressure drop of the total catalyst bed of each tube is taken. If the total catalyst bed pressure drop is higher than 106% of the average pressure drop, Then use a vacuum cleaner to suck out a part of the catalyst. If the total bed pressure of the catalyst is lower than 94% of the average pressure drop, it should be released and refilled.

[0027] The above filling was repeated 30 times, and the bed pressure drop was counted. The statistical results are shown in Tabl...

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Abstract

The invention aims at providing a method of filling maleic anhydride catalysts through benzene. The method comprises the steps of (1) preparation before filling of the catalysts, (2) filling of second-stage catalysts and (3) filling of first-stage catalysts. The filling method has the advantages that by measuring the heights and bed pressure drops of a secondary catalyst bed and a primary catalyst bed respectively, bridging of the catalysts can be prevented, the problem of non-uniform filling of the two-stage catalysts is solved, and then adverse effects on the catalytic reaction process are reduced.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for loading a benzene-process maleic anhydride catalyst. Background technique [0002] Maleic anhydride (referred to as "maleic anhydride") is an important basic organic chemical raw material. The production of maleic anhydride mainly uses benzene, n-butane or butene as raw materials. At present, the production of maleic anhydride by gas-phase fixed-bed catalytic oxidation of benzene as raw material has a history of decades at home and abroad. The benzene oxidation method is a traditional production method for the production of maleic anhydride. , The technology is mature and reliable. [0003] Maleic anhydride is an exothermic reaction, so a shell-and-tube reactor is usually used in the reaction process. This reactor is usually filled with a catalyst in the tube, and the shell side is connected with an appropriate heat carrier. Although catalyst loading is a routine...

Claims

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Application Information

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IPC IPC(8): B01J8/06C07D307/60
CPCB01J8/0015B01J8/06B01J2208/00752B01J2208/00769B01J2208/00814C07D307/60
Inventor 庄广庆杨德清
Owner TIANJIN BOHUA ZHONGHE CHEM
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