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Method for preparing Y-type molecular sieve by using kaolin

A kaolin, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve problems such as consumption and high thermal energy, and achieve the effects of reducing energy consumption, low calcination temperature, and small crystal grains

Inactive Publication Date: 2011-11-02
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The silica and alumina in kaolin are often in a crystalline structure, which is difficult to react with acid or alkali. Therefore, before using kaolin as a raw material to synthesize molecular sieves, it is often necessary to roast kaolin at high temperature to convert it into a highly reactive silica-alumina. species, which require higher heat energy consumption

Method used

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  • Method for preparing Y-type molecular sieve by using kaolin
  • Method for preparing Y-type molecular sieve by using kaolin
  • Method for preparing Y-type molecular sieve by using kaolin

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Mix urea, raw kaolin powder and water in a mass ratio of 1.0:1.0:1.4 to form a slurry, and vigorously stir at 95° C. for 1.5 hours. After the reaction is finished, filter with suction and dry at 80° C. to obtain a kaolin-urea intercalation complex.

[0035] (2) directly calcining the intercalation compound obtained in step (1) at 600° C. for 2 hours to obtain metakaolin powder. NaY-3 was synthesized according to the method of Comparative Example 1. The relative crystallinity of NaY-3 determined by X-ray diffraction is 80.2%, and the silicon-aluminum ratio is 3.5. X-ray patterns such as image 3 (a) shown.

Embodiment 2

[0037] Prepare NaY-4 by the method for embodiment 1. The only difference is that the intercalation complex was fired at 830°C for 2 hours. The relative crystallinity in NaY-4 was determined to be 86.9% by X-ray diffraction, and the silicon-aluminum ratio was 3.3. X-ray patterns such as image 3 (b) shown.

Embodiment 3

[0039] Prepare NaY-5 by the method for embodiment 1. The only difference is that metakaolin calcined at 830°C and high-temperature calcined clay calcined at 950°C are mixed at a mass ratio of 3:7 for in-situ crystallization. The relative crystallinity in NaY-5 was determined by X-ray diffraction to be 20.0%, and the silicon-aluminum ratio was 4.66.

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Abstract

The invention discloses a method for preparing a Y-type molecular sieve by using kaolin, which comprises the following steps of: (1) introducing an intercalation reagent into the kaolin to prepare kaolin intercalation composite powder; (2) modifying the kaolin intercalation composite powder with silicon or directly roasting the kaolin intercalation composite powder at the temperature of between 450 and 1,030 DEG C; or modifying the kaolin intercalation composite powder with silicon or directly adding the kaolin intercalation composite powder into inorganic binder and water, uniformly mixing the three, spraying the mixture to obtain microspheres and then roasting the microspheres at the temperature of between 450 and 1,030 DEG C; and (3) mixing the roasted powder or microspheres and inorganic silicon source, sodium hydroxide solution, directing agent and water, and crystallizing the mixture to obtain powder or microspheres containing the NaY molecular sieve. The method is characterizedin that: the intercalation modified kaolin is used for synthesizing the NaY molecular sieve; the intercalation reagent is one or more of urea, dimethyl sulfoxide, potassium acetate, potassium propionate, formamide, long-chain amine with carbon atom number of 8 to 12 and N-methylformamide; and the NaY content of the synthesized powder or microspheres of the NaY molecular sieve is 40 to 100 percent.

Description

technical field [0001] The present invention is a method for synthesizing Y-type molecular sieve through kaolin and its preparation method. Specifically, it is a method for preparing Y-type molecular sieve by crystallization of modified kaolin. The content of NaY is 10% to 100%. The ratio is 2.0 to 6.0. Background technique [0002] With the heavy and inferior crude oil in the world, the refining of heavy oil and residual oil in the catalytic cracking process has become the main processing raw material used by various manufacturers. Since heavy oil contains more colloids, asphaltenes and heavy metals, FCC catalysts are required to have higher matrix activity, stronger resistance to metal pollution, better catalytic activity and selectivity. Among them, the FCC catalyst containing Y-type zeolite is currently the most used type of catalyst with the highest sales. [0003] Synthesizing molecular sieves with kaolin as a raw material can be traced back to the 1960s. US3,391,994...

Claims

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Application Information

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IPC IPC(8): C01B39/24
Inventor 王一萌吴瑛焦文千何鸣元
Owner EAST CHINA NORMAL UNIVERSITY
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