Method for synthesizing MCM-49 molecular sieves

A technology of MCM-49 and synthesis method, which is applied in the field of synthesis of MCM-49 molecular sieve, and can solve the problems of low crystallinity and long crystallization time of MCM-49 molecular sieve

Inactive Publication Date: 2005-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the crystallization time of existing literature is relatively long in the process of synthesizing MCM-49 molecular sieve, and the crystallinity of the synthesized MCM-49 molecular sieve is relatively low, and a new MCM-49 is provided. The synthetic method of molecular sieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 600 grams of 40% (weight) of silica sol, add 1224 grams of water, 60 grams of sodium metaaluminate [Al 2 o 3 , 42% (weight)] and 20 grams of sodium hydroxide, after that, add 200 grams of hexamethyleneimine (HMI). The above mixture was aged at 40°C for 2 days, then raised to 142°C for crystallization, and crystallized for 80 hours. Rinse with distilled water until neutral, and dry. X-ray powder diffraction showed (XRD) that the synthesized product was MCM-49. Wherein the reaction mixture is in molar ratio: SiO 2 / Al 2 o 3 16.19, OH - / SiO 2 0.25, H 2 O / SiO 2 22.0, HMI / SiO 2 is 0.50. The obtained MCM-49 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 16.05, and the crystallinity of MCM-49 molecular sieve is 99.2%.

Embodiment 2

[0026] According to the various conditions and steps of Example 1, only changing the aging temperature to 80°C and the aging time to 60 hours, X-ray powder diffraction showed that (XRD) the synthesized product was MCM-49, and MCM was determined in addition. -49 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 16.10, and the crystallinity of MCM-49 molecular sieve is 99.5%.

Embodiment 3～6

[0028] According to each condition and step of embodiment 1, just change crystallization time, temperature during aging and aging time and add the seed crystal of MCM-49 before or after crystallization, its result is as follows:

[0029] Example number

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Abstract

The present invention relates to the preparation process of MCM-49 molecular sieve and solves the problems in the preparation process, including long MCM-49 molecular sieve synthesizing period and low molecular sieve crystallization degree. The technological scheme of the present invention is that before the preparation of MCM-56 molecular sieve, the molecular sieve precursor mixture is aged at 0-100 deg.c for 0.5-720 hr before crystallization. The present invention may be used in industrial process of preparing MCM-49 molecular sieve.

Description

technical field [0001] The invention relates to a synthesis method of MCM-49 molecular sieve. Background technique [0002] In industry, zeolite molecular sieves are porous crystalline aluminosilicates, which have a regular and ordered crystal structure, so they have characteristic X-ray diffraction. The basic framework structure of molecular sieves is based on the rigid three-dimensional TO 4 (SiO 4 , AlO 4 etc.) unit structure; in this structure TO 4 Oxygen atoms are shared in a tetrahedral manner, and the skeleton tetrahedron such as AlO 4 The charge balance of is through surface cations such as Na + , H + existence is maintained. It can be seen that the framework properties of zeolite molecular sieves can be changed by means of cation exchange. At the same time, in the structure of zeolite molecular sieve, there are abundant pore systems with certain pore diameters, and these pore channels are interlaced to form a three-dimensional ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/06C01B39/04
Inventor 高焕新周斌顾瑞芳方华季树芳
Owner CHINA PETROLEUM & CHEM CORP
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