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Method for modifying molecular sieve

A molecular sieve, hydrogen-type molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of complicated operation, intermittent operation, affecting the performance of use, etc., and achieve the effect of improving processing efficiency, avoiding high temperature burning, and improving utilization rate

Inactive Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the roasting method is generally suitable for some molecular sieves with high thermal stability. For molecular sieves with poor thermal stability, skeleton shrinkage or collapse is easy to occur during the roasting process. Even for molecular sieves with high thermal stability, due to the long-term High temperature for a long time will also lead to different degrees of damage to its structure, which will affect its performance
CN1138007A discloses an oxidant-promoted calcination method, which firstly treats the molecular sieve with an oxidant, such as hydrogen peroxide solution, and then calcines it at 200-500°C. This method is an improvement on the thermal calcination method, but the calcination temperature does not decrease much. , still has the disadvantages of the common roasting method
In the process of adsorption and catalysis, acid sites are generally needed to promote the catalytic reaction, and the cations on the surface of the generally synthesized molecular sieves are alkali metals, which do not have or are very weakly acidic, and cannot meet the requirements of use. Perform ion exchange to exchange the alkali metal ions on the surface for acidic cations. At present, ammonium salt exchange and acid exchange are generally used.
Ammonium salt exchange generally requires multiple exchanges to meet the requirements, which has disadvantages such as cumbersome operation, long time and high cost, and the obtained molecular sieve containing ammonium ion must be converted into hydrogen molecular sieve through roasting, causing environmental pollution, cost increase and damage to the environment. Disadvantages such as secondary damage of molecular sieves
The conventional method of acid exchange still has the above-mentioned problems of intermittent operation, high labor intensity, serious waste of resources and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Modified ZSM-5 Molecular Sieve (E-1)

[0023] The process of this method is as follows:

[0024] (1) Get 100 grams of ZSM-5 former powder (0.8 mass % of nitrogen content, 2.8 mass % of sodium content) and place it in the sample pool 4, add 500 milliliters of toluene in the distiller 2, heat to make the toluene boil, and reflux for 6 hours, After the sample was dried, the nitrogen content was analyzed, and the denitrification rate was calculated (the template agent is a nitrogen-containing compound). The results are shown in Table 1.

[0025] (2) Get the sample obtained through step (1) and place it in the sample pool 4, add 500 milliliters of 3.0% by mass hydrochloric acid in the distiller 2, heat the hydrochloric acid to boil, reflux for 8 hours, and analyze its relative strength after the sample is dried. The crystallinity and sodium content were used to calculate the sodium removal rate, and the results are shown in Table 1.

Embodiment 2

[0027] Preparation of Modified β Molecular Sieve (E-2)

[0028] The process of this method is as follows:

[0029] (1) Get 100 grams of beta molecular sieve former powder (nitrogen content 1.1% by mass, sodium content 3.2% by mass) and place it in the sample pool 4, add 500 milliliters of chloroform in the distiller 2, heat the chloroform to boil, and reflux After 12 hours, the nitrogen content in the sample was analyzed after drying, and the denitrification rate was calculated. The results are shown in Table 1.

[0030] (2) Get the sample obtained through step (1) and place it in the sample pool 4, add 500 milliliters of 3.0% hydrochloric acid in the distiller 2, heat to make the hydrochloric acid boil, and reflux for 8 hours, and the sample is analyzed after drying. The crystallinity and sodium content were used to calculate the sodium removal rate, and the results are shown in Table 1.

Embodiment 3

[0032] Preparation of Modified ZSM-22 Molecular Sieve (E-3)

[0033] The treatment process was the same as in Example 1, except that ZSM-22 molecular sieve (nitrogen content 0.6% by mass, sodium content 1.6% by mass) replaced ZSM-5 molecular sieve. The results are shown in Table 1.

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Abstract

The invention relates to a method for modifying a molecular sieve, which comprises the steps of: firstly, extracting an organic template agent in molecular sieve raw powder containing the organic template agent on an extraction device by using an organic agent; and then carrying out ion exchange on the extraction device by using an acid solution, and translating into a hydrogen type molecular sieve, wherein no roasting step exists in the method of modifying the molecular sieve. The method provided by the invention has the advantages of high degree of crystallization, high modifying efficiency, no pollution and the like.

Description

technical field [0001] The invention relates to a method for modifying molecular sieves. More specifically, the present invention relates to a method for removing the organic template agent from the synthesized raw powder of the molecular sieve and converting it into a hydrogen-type molecular sieve. Background technique [0002] Molecular sieves are an important member of crystalline materials. Many kinds of molecular sieves have been discovered, such as zeolite A, ZSM series, β, X, Y, SAPO series and other microporous molecular sieves and MCM-41 and other medium pore molecular sieves. [0003] Molecular sieves are widely used in the fields of adsorption, separation, catalysis, ion exchange, and host-guest assembly due to their regular pore structure, large surface area, large number of exchangeable ions, and rich morphology. Generally speaking, the synthesis process of most molecular sieves requires the introduction of organic substances as templates, such as organic amine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 徐会青刘全杰贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP
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