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Modified method of Y-type molecular sieve

A molecular sieve and modification technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problem of small mesopore volume of the product Y-type molecular sieve, insignificant increase in mesopore, and large environmental pollution. problems, to achieve the effect of being beneficial to catalytic cracking, easy to control the operation process, and easy to control the reaction conditions

Inactive Publication Date: 2013-03-06
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, treating NH with water vapor 4 Y-type molecular sieve is the most commonly used treatment method, but this method consumes a lot of energy, and multiple ammonia exchanges will also cause ammonia nitrogen emissions
with (NH 4 ) 2 SiF 6 and SiCl 4 Treating NaY can increase the skeleton silicon-alumina ratio to over 50, and the crystallinity is well preserved, but the raw materials of this method are relatively expensive, and the product Y-type molecular sieve mesopore volume is relatively small, and the treatment process has great environmental pollution
Treatment with other chemical methods will also increase the ratio of silicon to aluminum in the framework, but it will cause a decrease in crystallinity, and the increase in mesopores is not obvious

Method used

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  • Modified method of Y-type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Mix NaY, aluminum sulfate octadecahydrate, and water in a mass ratio of 3.5:2:4, then add ethanol to the reaction system, and the mass ratio of ethanol to water is 1:1. The reaction mixture was reacted at 185°C for 1d. After the reaction was completed, it was filtered, washed, and dried at 80°C to obtain GCCP-1-1.

[0058] (2) GCCP-1-1: NaOH: H 2 O was mixed in a mass ratio of 1:0.1:10, stirred at 80°C for 1 hour, washed and filtered, and dried at 80°C, which was designated as GCCP-2-1(0), and GCCP-2- 1(0):NaOH:H 2 O was mixed in a mass ratio of 1:0.1:10, stirred at 80°C for 1 hour, washed and filtered, dried at 80°C, calcined at 550°C, and designated as GCCP-2-1. The relative crystallinity of the Y-type molecular sieve determined by X-ray diffraction is 70%, the silicon-aluminum ratio of the skeleton is 7.0, and the final total solid phase yield is 77.3%. The X-ray spectrum of GCCP-1-1 is as follows figure 1 (b), figure 1 The miscellaneous peaks marked by the...

Embodiment 2

[0060] (1) The first step of Example 2 is the same as Example 1 to obtain GCCP-1-1.

[0061] (2) GCCP-1-1: NaOH: H 2 O was mixed in a mass ratio of 1:0.2:10, stirred at 80°C for 1 hour, washed and filtered, dried at 80°C, calcined at 550°C, and designated as GCCP-2-2. The relative crystallinity of the Y-type molecular sieve measured by X-ray diffraction is 70%, the skeleton silicon-aluminum ratio is 6.8, and the final total solid phase yield is 76.7%. The X-ray spectrogram of GCCP-2-2 is as follows figure 1 (d), shown N 2 Adsorption-desorption curve (a) and BJH adsorption pore size distribution curve (b) see image 3 , the adsorption data are shown in Table 1.

Embodiment 3

[0063] (1) Mix NaY, aluminum sulfate octadecahydrate, and water in a mass ratio of 4.35:2:4, then add ethanol to the reaction system, and the mass ratio of ethanol to water is 0.8:1. The reaction system was reacted at 185° C. for 1 day. After the reaction was completed, it was filtered, washed, and dried at 80°C to obtain GCCP-1-3.

[0064] (2) GCCP-1-3: NaOH: H 2 O was mixed according to the mass ratio of 1:0.2:10, stirred at 80°C for 1 hour, washed and filtered, dried at 80°C, calcined at 550°C, recorded as GCCP-2-3, determined by X-ray diffraction The relative crystallinity of the Y-type molecular sieve is 83%, the silicon-aluminum ratio of the skeleton is 6.52, and the final total solid phase yield is 80.7%. N shown in GCCP-2-3 2 Adsorption-desorption curve (a) and BJH adsorption pore size distribution curve (b) see Figure 4 , the adsorption data are shown in Table 1.

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Abstract

The invention discloses a modified method of a Y-type molecular sieve. The modified method comprises the following steps of: dissolving the Y-type molecular sieve and aluminum sulfate or aluminum sulfate containing crystal water into water, adding alcohol, reacting for 0-10 days at the temperature of 100-200 DEG C, filtering products after reaction, cleaning and obtaining mixture of an alunite-like phase and the Y-type molecular sieve; and adopting alkali compound to treat the mixture for 0-100 hours at the temperature of 0-100 DEG C and obtaining the modified Y-type molecular sieve. The modified method disclosed by the invention is wide in material source, low in cost and simple in reaction process, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for modifying a Y-type molecular sieve, in particular to a method for treating the Y-type molecular sieve with aluminum ions and sulfate ions, and then modifying the Y-type molecular sieve through alkali treatment. Background technique [0002] With the heavy and inferior quality of petroleum, the processing raw materials used by various refineries in the catalytic cracking process are mainly refined heavy oil and residual oil. Due to the harsh reaction conditions of catalytic cracking, it is required that the main active component Y-type molecular sieve in the catalytic cracking (FCC) catalyst has high thermal stability and hydrothermal stability. In general, Y-type molecular sieves with a higher skeleton-silicon-aluminum ratio have higher thermal stability and hydrothermal stability, and it is generally required that the skeleton-silicon-aluminum ratio of the Y-type molecular sieve is at least greater than 9. At the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 王一萌施宗波何鸣元
Owner EAST CHINA NORMAL UNIV
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