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Method used for preparing ZSM-5 molecular sieve taking white mud as raw material, and ZSM-5 molecular sieve

A technology of ZSM-5 and molecular sieve, which is applied in the field of molecular sieves, can solve the problems of large emissions and environmental pollution, and achieve the effects of low production costs, improved economic benefits, and good performance

Active Publication Date: 2017-11-07
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Large amount of emissions, polluting the environment

Method used

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  • Method used for preparing ZSM-5 molecular sieve taking white mud as raw material, and ZSM-5 molecular sieve
  • Method used for preparing ZSM-5 molecular sieve taking white mud as raw material, and ZSM-5 molecular sieve
  • Method used for preparing ZSM-5 molecular sieve taking white mud as raw material, and ZSM-5 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) After mixing 20g of lime mud and 28g of sodium hydroxide evenly, calcining and activating at 650°C for 2 hours to obtain clinker;

[0039] (2) add deionized water and tetrapropyl ammonium hydroxide respectively in the clinker that step (1) obtains, make the add-on of deionized water be 20ml / 1g white mud, tetrapropyl ammonium hydroxide and deionized water The mol ratio is 1:160, then stir 5h to obtain silica-alumina gel;

[0040] (3) Put the silica-alumina gel obtained in step (2) in a crystallization kettle, crystallize at 180°C for 36 hours to obtain a crystallized product, filter, wash and dry the crystallized product to obtain a ZSM-5 molecular sieve.

[0041] The XRD spectrum pattern of this ZSM-5 molecular sieve is as figure 1As shown, compared with the standard spectrum, what is obtained is indeed a ZSM-5 molecular sieve; the catalytic performance of the ZSM-5 molecular sieve in the toluene disproportionation reaction (reaction temperature is 450 ° C) is as f...

Embodiment 2

[0043] (1) After mixing 20g of white mud and 26g of sodium hydroxide evenly, calcining and activating at 600°C for 3 hours to obtain clinker;

[0044] (2) add deionized water and tetrapropyl ammonium hydroxide respectively in the clinker that step (1) obtains, make the add-on of deionized water be 10ml / 1g white mud, tetrapropyl ammonium hydroxide and deionized water The mol ratio is 1:100, then stir 5h to obtain silica-alumina gel;

[0045] (3) Put the silica-alumina gel obtained in step (2) in a crystallization kettle, crystallize at 165° C. for 48 hours to obtain a crystallized product, filter, wash and dry the crystallized product to obtain a ZSM-5 molecular sieve.

[0046] The characteristic peak position of the XRD spectrogram of this ZSM-5 molecular sieve and figure 1 Identical; The catalytic performance of this ZSM-5 molecular sieve in toluene disproportionation reaction (reaction temperature is 450 ℃) is as follows: the productive rate of benzene is 24.05%, and the pr...

Embodiment 3

[0048] (1) After mixing 20g of white mud and 30g of sodium hydroxide evenly, calcining and activating at 700°C for 1 hour to obtain clinker;

[0049] (2) add deionized water and tetrapropyl ammonium hydroxide respectively in the clinker that step (1) obtains, make the add-on of deionized water be 30ml / 1g white mud, tetrapropyl ammonium hydroxide and deionized water The mol ratio is 1:200, then stir 5h to obtain silica-alumina gel;

[0050] (3) Put the silica-alumina gel obtained in step (2) in a crystallization kettle, crystallize at 190° C. for 48 hours to obtain a crystallized product, filter, wash and dry the crystallized product to obtain a ZSM-5 molecular sieve.

[0051] The characteristic peak position of the XRD spectrogram of this ZSM-5 molecular sieve and figure 1 Identical; The catalytic performance of this ZSM-5 molecular sieve in toluene disproportionation reaction (reaction temperature is 450 ℃) is as follows: the productive rate of benzene is 24.20%, and the pro...

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Abstract

The invention provides a method used for preparing ZSM-5 molecular sieve taking white mud as a raw material, and the ZSM-5 molecular sieve prepared via the method. The method comprises following steps: 1, white mud and an activator are subjected to calcining activation so as to obtain a clinker, wherein the activator is sodium hydroxide or anhydrous sodium carbonate; 2, deionized water and a template agent are added into the clinker, and uniform stirring is carried out so as to obtain a silicon-aluminium gel; and 3, the silicon-aluminium gel obtained in step 2 is delivered into a crystallization kettle for crystallization so as to obtain the ZSM-5 molecular sieve. According to the method, white mud is taken as a raw material to prepare the ZSM-5 molecular sieve, full utilization of effective silicon and aluminium in white mud to prepare the ZSM-5 molecular sieve is realized, waste utilization of white mud is realized, the preparation cost of the ZSM-5 molecular sieve is reduced, it is beneficial for improvement of economic benefit and market competitiveness, the preparation method is simple, the obtained ZSM-5 molecular sieve is low in production cost, is high in economic benefit and market competitiveness.

Description

technical field [0001] The invention belongs to the field of molecular sieves, in particular to a method for preparing ZSM-5 molecular sieves and ZSM-5 molecular sieves by using lime mud as a raw material. Background technique [0002] Due to its unique shape-selective catalysis and acidic properties, ZSM-5 molecular sieve has very important applications in the field of catalysis and separation, and has always been a research hotspot for chemical researchers. At present, there have been a large number of reports on the preparation and performance research of ZSM-5 molecular sieves, but they mainly focus on using pure chemical reagents such as silica gel, water glass, silica sol, and ethyl orthosilicate with high cost as silicon sources. To add aluminum sources such as aluminum nitrate and aluminum sulfate in addition, the preparation cost is higher and the market competitiveness is weak. [0003] Fly ash is a solid waste in the process of generating electricity in thermal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40C01B39/38B01J29/40C07C6/12C07C15/06C07C15/08
CPCB01J29/40C01B39/38C01B39/40C01P2002/72C07C6/123C07C15/06C07C15/08Y02P20/52
Inventor 杨春明王永旺陈东郭昭华王增国赵明张一雯王瑞姬学良
Owner CHINA SHENHUA ENERGY CO LTD
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