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Process for preparing EUO structure-like zeolite, zeolite obtained therefrom and use thereof

A type of structure, zeolite technology, applied in the direction of crystalline aluminosilicate zeolite, isomerization hydrocarbon production, organic chemical methods, etc., can solve the problems of low selectivity of xylene, non-negligible interference reaction, etc., and achieve high yield Effect of large size, good crystallization time, and low Si/Al ratio

Inactive Publication Date: 2009-04-22
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

US-A-4723 051 and US-A-4 665 258, for example, describe optimized formulations based on mordenite and group VIII metals, but the catalysts obtained from them still interfere with the reaction in a non-negligible manner
These catalysts are not very selective for xylenes, which favors the aforementioned interfering reactions that constitute the net loss of the desired isomerization reaction

Method used

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  • Process for preparing EUO structure-like zeolite, zeolite obtained therefrom and use thereof
  • Process for preparing EUO structure-like zeolite, zeolite obtained therefrom and use thereof
  • Process for preparing EUO structure-like zeolite, zeolite obtained therefrom and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Embodiment 1 (comparison) ; According to the prior art, using the benzhydryl dimethyl ammonium precursor as an organic structure agent to synthesize EUO zeolite, the Si / Al ratio of the gel is equal to 58.

[0116] The synthesis conditions are as specified in Table 1.

[0117] 3530 grams of benzyldimethylamine (Lancaster, 98%) and 3260 grams of benzyl chloride (Fluka, 99%) were diluted in 42.92 grams of water, then 38.45 grams of colloidal silica sol (Ludox HS40, Dupont, 40% SiO 2 ), a solution A consisting of silicon and a structurant precursor is prepared. Then 0.610 g of solid sodium hydroxide (Prolabo, 99%) and 0.496 g of solid sodium aluminate (Prolabo, 46% Al 2 o 3 , 33% Na 2 O) was dissolved in 5.36 g of water to prepare solution B. Solution A was added to solution B with stirring, followed by 5.36 grams of water. Mix it until smooth. The resulting mixture was reacted with stirring at 180° C. for 3 days in a 125 ml autoclave under autogenous pressure. Aft...

Embodiment 2

[0127] Embodiment 2 (the present invention) : According to the present invention, EUO zeolites were synthesized using benzhydryldimethylammonium precursors as organic structurants, the Si / Al ratio of the gels being equal to 30.

[0128] The synthesis conditions are as specified in Table 3.

[0129] 3530 grams of benzyldimethylamine (Lancaster, 98%) and 3260 grams of benzyl chloride (Lancaster, 99%) were diluted in 42.79 grams of water, and then 38.37 grams of colloidal silica sol (Ludox HS40, Dupont, 40% SiO 2 ), a solution A consisting of silicon and a structurant precursor is prepared. Then 0.418 grams of solid sodium hydroxide (Prolabo, 99%) and 0.945 grams of solid sodium aluminate (Prolabo, 46% Al 2 o 3 , 33% Na 2 O) was dissolved in 5.35 g of water to prepare solution B. Solution A was added to Solution B with stirring, followed by 5.35 grams of water. Mix it until smooth. Finally, 0.616 grams of post-synthesized EUO zeolite seeds containing sodium and hexanedia...

Embodiment 3

[0139] Embodiment 3 (comparison) : Synthesis of EUO zeolites with gels with a Si / Al ratio equal to 30 using benzhydryldimethylammonium precursors as organic structurants and without seeds.

[0140] The synthesis conditions are as specified in Table 5.

[0141] 3530 grams of benzyldimethylamine (Lancaster, 98%) and 3260 grams of benzyl chloride (Lancaster, 99%) were diluted in 42.79 grams of water, and then 38.37 grams of colloidal silica sol (Ludox HS40, Dupont, 40% SiO 2 ), a solution A consisting of silicon and a structurant precursor is prepared. Then 0.418 grams of solid sodium hydroxide (Prolabo, 99%) and 0.945 grams of solid sodium aluminate (Prolabo, 46% Al 2 o 3 , 33% Na 2 O) was dissolved in 5.35 g of water to prepare solution B. Solution A was added to solution B with stirring, followed by 5.35 grams of water. Mix it until smooth. The resulting mixture was stirred and reacted at 180° C. for 9 days in a 125 ml autoclave under autogenous pressure. After cooli...

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Abstract

This invention relates to a process for synthesis of an EUO-structural-type zeolite that comprises at least one element X that is selected from among silicon and germanium and at least one element T that is selected from among aluminum, iron, gallium, boron, titanium, vanadium, zirconium, molybdenum, arsenic, antimony, chromium and manganese, whereby said process is carried out in the presence of an organic structuring agent that is derived from dibenzyldimethylammonium (DEDMA) or its precursors and in the presence of nuclei of at least one zeolitic material of the same structure as the zeolite that is to be synthesized. The zeolite that is thus obtained has an X / T ratio of between 5 and 50. It is used in particular as a catalyst, for example in a process for isomerization of aromatic compounds with 8 carbon atoms per molecule.

Description

technical field [0001] The present invention relates to a process for the preparation of zeolites of EUO structure type synthesized using seed crystals in order to obtain zeolites with a well-defined crystal structure and chemical composition, which after synthesis contain nitrogen-containing organic cations of a defined chemical formula in pores in their crystals. The present invention also relates to zeolites prepared in this way, and in the presence of catalysts based on EUO zeolites prepared according to the process of the invention, said zeolites having aromatic compounds having 8 carbon atoms, also called "aromatic C8 fraction". Application in isomerization methods of family compounds. Background technique [0002] The isomerization of ethylbenzene or a mixture of xylene and ethylbenzene to xylene requires the presence of an acid function and a Group VIII metal. The basic purpose of isomerization of the C8 aromatic fraction is to produce para-xylene, which is the most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04B01J29/06B01J29/74B01J23/42B01J29/04B01J29/70C01B39/06C01B39/48C07B61/00C07C5/27C07C15/08C10G35/095
CPCC01B39/48B01J23/42B01J29/7023B01J29/04C01B39/06C10G2400/30B01J29/7446
Inventor L·罗莱奥F·科伦达E·默伦F·阿拉里奥
Owner INST FR DU PETROLE