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Method for preparing zeolite catalyst

A zeolite catalyst and zeolite technology are applied in catalyst activation/preparation, preparation of organic compounds, preparation of lactams, etc., and can solve problems such as expensive, inability to separate catalysts and the like

Inactive Publication Date: 2004-05-19
ENICHEM SPA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In this case, the catalyst cannot be separated from the synthesis medium by conventional methods, such as filtration or continuous centrifugation, but needs to be processed in batches using more expensive techniques

Method used

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  • Method for preparing zeolite catalyst
  • Method for preparing zeolite catalyst
  • Method for preparing zeolite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Synthetic H 2 O / SiO 2 MFI zeolite with molar ratio=4

[0074] 19.1 kg of a 40% by weight aqueous solution of tetrapropylammonium hydroxide (TPA-OH) were charged to a 100 liter autoclave. 32.0 kg of tetraethylorthosilicate (TEOS) was added.

[0075] The temperature was raised to 190°C and the mixture was crystallized under autopressure for 2 hours.

[0076] The mixture was cooled to room temperature and the cloudy slurry was discharged from the reactor.

[0077] 100 grams of the slurry were centrifuged to obtain 18 grams of solid, identified by XRD as pure MFI phase. The crystallization rate was 100%.

Embodiment 2

[0079] synthetic binding phase

[0080] 40% 4.6 kg TPAOH, 24.2 kg water and 20.8 kg TEOS were charged continuously into a 100 liter autoclave. The mixture was heated to 60°C for 1 hour to facilitate decomposition. After cooling, the clear sol was taken out.

Embodiment 3

[0082] Prepared catalyst (30% SiO 2 -70% MFI)

[0083] 15.0 kg of the slurry prepared according to the method of Example 1 was mixed with 9.5 kg of the solution prepared according to the method of Example 2. The mixture was heated to 70°C for 3 hours.

[0084] The slurry obtained was atomized with a Niro Mobile Minor HI-TEC atomizer, fed with a 1.5 mm nozzle at a feed rate of about 5 liters / hour and an outlet temperature of 100°C.

[0085] Discharge the product from the bottom of the container.

[0086] The morphology of the product, determined by means of SEM analysis on cut samples, is shown in Figures 1a (80x magnification), b (600x magnification). A specific spherical shape can be seen, consisting of a dense shell in which a low-density phase is wrapped.

[0087] figure 2 Shown is a TEM image (transmission electron microscope) of a magnified section (400000× magnification) of a sphere, showing the different composition between the substantially amorphous outer shell a...

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Abstract

The present invention relates to a process for the preparation of zeolitic catalysts comprising zeolite and oligomeric silica, which can be used in industrial reactors. The process consists in directly mixing the suspension, resulting from the synthesis of the zeolite, with an oligomeric silica sol, obtained from the hydrolysis of a tetra-alkyl ortho silicate in the presence of tetraalkylammonium hydroxide, and in subjecting the mixture to rapid drying, by feeding to a spray-dry.

Description

field of invention [0001] The present invention relates to a process for the preparation of zeolite catalysts comprising zeolite and oligomeric silica for use in process reactors. [0002] More specifically, the present invention relates to a process for the preparation of zeolite catalysts characterized by their original morphology, comprising directly mixing the suspension formed during the synthesis of the zeolite with an oligomeric silica sol and rapidly drying the mixture. [0003] The invention also relates to materials prepared as described above and methods of using them as catalysts. Background technique [0004] It is known in the prior art to use zeolites and zeolitic materials as basic components for the preparation of catalysts which can be used in many reactions in industry. [0005] For example, it is known in the prior art that MFI-type zeolite with low trivalent heteroelement content is an essential component for the preparation of catalysts that can be use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D223/10B01J29/06B01J29/40B01J29/70B01J29/89B01J35/08B01J37/00B01J37/02B01J37/04C01B37/00C01B39/02C01B39/04C07C231/10C07D201/04
CPCB01J37/0219B01J35/08C01B37/00B01J37/0072B01J29/40C07C231/10B01J29/89B01J37/0045C01B39/026B01J35/51B01J29/06B01J37/04
Inventor G·博蒂A·卡拉迪L·达尔罗
Owner ENICHEM SPA
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