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Synthetic method for MCM-22 molecular sieve

A synthetic method and technology of molecular sieves, applied in molecular sieves and base exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as large radius and difficulties

Inactive Publication Date: 2006-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large hydration ion radius of rare earth elements, the Re 3+ It is difficult to exchange ions into the pores of molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The MCM-22 molecular sieve provided by the present invention is prepared by using silica gel as a silicon source, and hexamethyleneimine (HMI) and butylamine (BuA, with a purity of 99%) as templates.

[0028] Change the templating agent in comparative example 1 to 1.58 grams of HMI and 1.17 grams of butylamine (BuA), so that (HMI+BuA) / SiO 2 =0.35, BuA / HMI=1, and the composition of other raw materials remained unchanged. The crystallization temperature and time are 160° C. and 84 h, respectively, and the product is MCM-22 molecular sieve with a relative crystallinity of 86%.

Embodiment 2

[0030] The MCM-22 molecular sieve provided by the present invention was prepared by using silica gel as a silicon source, hexamethyleneimine (HMI) and cyclohexylamine (CHA, with a purity of 98%, the same below) as templates.

[0031] Change the templating agent in comparative example 1 to 1.58 gram HMI and 1.58 gram (CHA), make (HMI+BuA) / SiO 2 =0.35, CHA / HMI=1, and the composition of other raw materials remained unchanged. The crystallization temperature and time were 160° C. and 84 h, respectively, and the product was MCM-22 molecular sieve with a relative crystallinity of 91%.

Embodiment 3

[0033] The MCM-22 molecular sieve provided by the invention is prepared by using silica gel as a silicon source, hexamethyleneimine (HMI) and cyclohexylamine (CHA) as a template.

[0034] Change the templating agent in comparative example 1 to 1.06g HMI and 2.10g CHA, make (HM+CHA) / SiO 2 =0.35, CHA / HMI=2, and the composition of other raw materials remained unchanged. The crystallization temperature and time are 160° C. and 100 h, respectively, and the product is MCM-22 molecular sieve with a relative crystallinity of 100%.

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PUM

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Abstract

A method for synthesizing MCM-22 molecular screen, which possesses MWW topological structure, employing silicon, aluminium, alkali, mould agent and deionized water as reacting raw material, blooming under the temperature of 135-185 Deg C for some time, hydrothermal synthesizing the needed molecular screen; the invention is characterized by using diamin liquid mixture (BA) as mould agent to prepare molecular screen, one (SDAI) is hexamethylene amine (HMI), another (SDA2) is any one of the followings: cyclohexylamine (CHA)or buta (BuA) or isopropyl amine (IPA).

Description

technical field [0001] The invention relates to a method for synthesizing molecular sieves. Specifically, it is a method for synthesizing molecular sieves with MCM-22 molecular sieve crystal phase structure. Background technique [0002] MCM-22 molecular sieve (USP 4,954,325) is a molecular sieve with two non-intersecting pore systems, which contains two pore systems of 12-membered ring and 10-membered ring, and the template used is generally hexamethyleneimine. MCM-22 exhibits excellent performance in a variety of catalytic reactions, such as MCM-22 for the alkylation of benzene and ethylene, with high activity, good selectivity for monoalkylbenzene (ethylbenzene), and low benzene / ethylene ratio (can be It can reduce the cost of reaction and rectification equipment); it can be used as an additive for catalytic cracking catalyst to improve catalytic cracking performance. [0003] Generally speaking, the ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) of MCM-22 below 100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/06
CPCC01B39/48
Inventor 徐龙伢牛雄雷谢素娟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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