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Method for preparing MCM-49 molecular sieves

A technology of MCM-49 and molecular sieve, which is applied in the field of preparation of MCM-49 molecular sieve, can solve the problems of high cost and environmental pollution of nitrogen-containing organic substances, and achieve the effects of reducing synthesis cost, eliminating pollution and reducing consumption

Inactive Publication Date: 2004-06-02
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 to overcome the high cost of preparing MCM-49 molecular sieves in the previous literature and the problems that nitrogen-containing organic substances in the crystallization mother liquor cause relatively large pollution to the environment, and provide a new preparation method for MCM-49 molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get the silica sol of 600 grams 40% (weight), add 724 grams of water, 60 grams of sodium metaaluminate [Al 2 o 3 , 42% (weight)] and 20 grams of sodium hydroxide, after that, add 160 grams of hexamethyleneimine (HMI) and 540 grams of crystallization mother liquor containing 40 grams of hexamethyleneimine. The above mixture was crystallized by raising the temperature to 142°C for 85 hours. Rinse with distilled water until neutral, and dry. X-ray powder diffraction showed (XRD) that the synthesized product was MCM-49. Wherein the above 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 0.50, the obtained MCM-49 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 for 16.1.

Embodiment 2

[0027] According to each condition and step of embodiment 1, just change the source amount of template agent hexamethyleneimine, wherein template agent (HMI) all originates from MCM-49 molecular sieve crystallization mother liquor, and the result is: X-ray powder diffraction shows (XRD) the synthesized product is MCM-49, according to the MCM-49 molecular sieve silicon aluminum molar ratio SiO obtained in addition 2 / Al 2 o 3 is 15.6.

Embodiment 3

[0029] According to each condition and step of embodiment 1, just change the source amount of template agent hexamethyleneimine, wherein the amount of directly added hexamethyleneimine (HMI) is 40 grams, from the amount of template agent in crystallization mother liquor Amount is 160 grams, and the result is: X-ray powder diffraction shows (XRD) that the synthesized product is MCM-49, and the MCM-49 molecular sieve silicon-aluminum molar ratio SiO that obtains according to measuring in addition 2 / Al 2 o 3 is 15.8.

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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 high MCM-49 molecular sieve synthesizing cost and environmental pollution. The technological scheme of the present invention is that during the preparation of MCM-49 molecular sieve, partial or all template agent comes from MCM-49 molecular sieve crystallizing mother liquid. The present invention may be used in industrial preparation.

Description

technical field [0001] The invention relates to a preparation 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 n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06C01B39/04
Inventor 高焕新周斌方华顾瑞芳季树芳
Owner CHINA PETROLEUM & CHEM CORP
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