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Method for synthesizing MCM-22 molecular sieve

A molecular sieve and compound technology, applied in the field of synthesis of MCM-22 molecular sieve, can solve the problems affecting the performance of molecular sieve, and achieve the effects of high product yield, short crystallization time, high product purity and crystallinity

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above synthesis method of MCM-22 molecular sieve, the reaction mixture is directly crystallized at high temperature, and ZSM-5, ZSM-12 or ZSM-35 miscellaneous crystals are prone to appear, which affects the performance of the molecular sieve

Method used

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  • Method for synthesizing MCM-22 molecular sieve
  • Method for synthesizing MCM-22 molecular sieve
  • Method for synthesizing MCM-22 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 0.71g NaAlO 2 Mix evenly with 3.18g of sodium hydroxide solution in a 100ml stainless steel reaction kettle, add 5.5g of silica gel, 69.7g of deionized water and 3.16g of HMI into the kettle in sequence while stirring, and finally add 0.275g of NaF. After continuing to stir for 10 minutes, the reaction vessel was sealed and crystallized at 110° C. for 60 h. After cooling, centrifuge the solid from the mother liquor, wash the solid with deionized water to pH 8-9, and air-dry the sample at 100°C for 8 hours to obtain the raw powder of molecular sieve, which is analyzed by X-ray diffraction (XRD) after roasting at 550°C for 4 hours It is determined that its crystal phase is MCM-22, and its relative crystallinity is 100%. Its XRD spectrum data are shown in Table 4.

Embodiment 2

[0047] 0.284g NaAlO 2 Mix evenly with 6.01g of sodium hydroxide solution in a 100ml stainless steel reaction kettle, add 5.5g of silica gel, 59.3g of deionized water, 3.00g of HMI and 1.50g of CHA into the kettle in sequence while stirring, and finally add 0.55g of NaCl. After continuing to stir for 10 minutes, the reaction vessel was sealed and crystallized at 120° C. for 15 hours. After cooling, centrifuge the solid from the mother liquor, wash the solid with deionized water to pH 8-9, and air-dry the sample at 100°C for 8 hours to obtain the raw powder of molecular sieve, which is analyzed by X-ray diffraction (XRD) after roasting at 550°C for 4 hours It is determined that its crystal phase is MCM-22, and its relative crystallinity is 99%. Its XRD spectrum data are shown in Table 5.

Embodiment 3

[0049] 0.284g NaAlO 2 Mix evenly with 6.01g of sodium hydroxide solution in a 100ml stainless steel reaction kettle, add 5.5g of silica gel, 59.3g of deionized water, 3.00g of HMI and 1.50g of CHA into the kettle in sequence, and finally add 1.1g of CHCl 3 . After continuing to stir for 10 minutes, the reaction vessel was sealed and crystallized at 130° C. for 20 h. After cooling, centrifuge the solid from the mother liquor, wash the solid with deionized water to pH 8-9, and air-dry the sample at 100°C for 8 hours to obtain the raw powder of molecular sieve, which is analyzed by X-ray diffraction (XRD) after roasting at 550°C for 4 hours It is determined that its crystal phase is MCM-22, and its relative crystallinity is 100%. Its XRD spectrum data are shown in Table 6.

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Abstract

The invention relates to a method for synthesizing MCM-22 molecular sieve. The method comprises the following steps of: preparing gel consisting of a silicon source, an aluminum source, an organic template agent, halogen compounds, alkali and water; then crystallizing the gel; and performing the traditional steps of filtering, washing, drying and roasting so as to obtain product of the MCM-22 molecular sieve, wherein the organic template agent can be dimethyleneimine, and also can be a mixed template agent composed of the dimethyleneimine and one or more than one of hydrocarbon, organic amine, alcohol and ketone. Compared with the prior art, the method has the advantages of low crystallization temperature, short crystallization time, high yield coefficient of product, high product quality and the like. The MCM-22 molecular sieve produced according to the invention has excellent catalytic performances of catalytic cracking, olefin alkylating, benzene alkylating and the like.

Description

technical field [0001] The invention relates to a method for synthesizing a molecular sieve with a MWW structure, in particular to a method for synthesizing an MCM-22 molecular sieve. Background technique [0002] Molecular sieves with MWW structure are a class of molecular sieves with sinusoidal 10-membered ring network pore system, 12-membered ring hole and supercage pore system structure. The catalytically active aluminum atoms were introduced into the framework of MWW molecular sieves to form MCM-22 molecular sieves. Due to the special pore structure, as an acidic catalytic active component, MCM-22 molecular sieve exhibits excellent catalytic performance in catalytic cracking, olefin and benzene alkylation. Molecular sieves with MWW structure, as acidic catalytic active components, have been industrialized in the process of alkylation of olefins and benzene. [0003] In recent years, the research on MCM-22 molecular sieve is very active. It was first developed by Mobil...

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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